feat: Refactor project creation and management to support modular project types

- Updated project creation modal to allow selection of optional modules (Sound and Vibration Monitoring).
- Modified project dashboard and header to display active modules and provide options to add/remove them.
- Enhanced project detail view to dynamically adjust UI based on enabled modules.
- Implemented a new migration script to create a `project_modules` table and seed it based on existing project types.
- Adjusted form submissions to handle module selections and ensure proper API interactions for module management.

.dockerignore

@@ -0,0 +1,44 @@
+docker-compose.override.yml
+
+# Python cache / compiled
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+
+# Build artifacts
+*.so
+*.egg
+*.egg-info
+dist
+build
+
+# VCS
+.git
+.gitignore
+
+# Databases (must live in volumes)
+*.db
+*.db-journal
+
+# Environment / virtualenv
+.env
+.venv
+venv/
+ENV/
+
+# Runtime data (mounted volumes)
+data/
+data-dev/
+
+# Editors / OS junk
+.vscode/
+.idea/
+.DS_Store
+Thumbs.db
+.claude
+sfm.code-workspace
+
+# Tests (optional)
+tests/

.gitignore

@@ -1,3 +1,17 @@
+# Terra-View Specifics
+# Dev build counter (local only, never commit)
+build_number.txt
+docker-compose.override.yml
+
+# SQLite database files
+*.db
+*.db-journal
+data/
+data-dev/
+.aider*
+.aider*
+
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[codz]
@@ -205,3 +219,15 @@ cython_debug/
 marimo/_static/
 marimo/_lsp/
 __marimo__/
+
+<<<<<<< HEAD
+# Seismo Fleet Manager
+# SQLite database files
+*.db
+*.db-journal
+/data/
+/data-dev/
+.aider*
+.aider*
+=======
+>>>>>>> 0c2186f5d89d948b0357d674c0773a67a67d8027

CHANGELOG.md

@@ -0,0 +1,660 @@
+# Changelog
+
+All notable changes to Terra-View will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.9.3] - 2026-03-28
+
+### Added
+- **Monitoring Session Detail Page**: New dedicated page for each session showing session info, data files (with View/Report/Download actions), an editable session panel, and report actions.
+- **Session Calendar with Gantt Bars**: Monthly calendar view below the session list, showing each session as a Gantt-style bar. The dim bar represents the full device on/off window; the bright bar highlights the effective recording window. Bars extend edge-to-edge across day cells for sessions spanning midnight.
+- **Configurable Period Windows**: Sessions now store `period_start_hour` and `period_end_hour` to define the exact hours that count toward reports, replacing hardcoded day/night defaults. The session edit panel shows a "Required Recording Window" section with a live preview (e.g. "7:00 AM → 7:00 PM") and a Defaults button that auto-fills based on period type.
+- **Report Date Field**: Sessions can now store an explicit `report_date` to override the automatic target-date heuristic — useful when a device ran across multiple days but only one specific day's data is needed for the report.
+- **Effective Window on Session Info**: Session detail and session cards now show an "Effective" row displaying the computed recording window dates and times in local time.
+- **Vibration Project Redesign**: Vibration project detail page is stripped back to project details and monitoring locations only. Each location supports assigning a seismograph and optional modem. Sound-specific tabs (Schedules, Sessions, Data Files, Assigned Units) are hidden for vibration projects.
+- **Modem Assignment on Locations**: Vibration monitoring locations now support an optional paired modem alongside the seismograph. The swap endpoint handles both assignments atomically, updating bidirectional pairing fields on both units.
+- **Available Modems Endpoint**: New `GET /api/projects/{project_id}/available-modems` endpoint returning all deployed, non-retired modems for use in assignment dropdowns.
+
+### Fixed
+- **Active Assignment Checks**: Unified all `UnitAssignment` "active" checks from `status == "active"` to `assigned_until IS NULL` throughout `project_locations.py` and `projects.py` for consistency with the canonical active definition.
+
+### Changed
+- **Sound-Only Endpoint Guards**: FTP browser, RND viewer, Excel report generation, combined report wizard, and data upload endpoints now return HTTP 400 if called on a non-sound-monitoring project.
+
+### Migration Notes
+Run on each database before deploying:
+```bash
+docker compose exec terra-view python3 backend/migrate_add_session_period_hours.py
+docker compose exec terra-view python3 backend/migrate_add_session_report_date.py
+```
+
+---
+
+## [0.9.2] - 2026-03-27
+
+### Added
+- **Deployment Records**: Seismographs now track a full deployment history (location, project, dates). Each deployment is logged on the unit detail page with start/end dates, and the fleet calendar service uses this history for availability calculations.
+- **Allocated Unit Status**: New `allocated` status for units reserved for an upcoming job but not yet deployed. Allocated units appear in the dashboard summary, roster filters, and devices table with visual indicators.
+- **Project Allocation**: Units can be linked to a project via `allocated_to_project_id`. Allocation is shown on the unit detail page and in a new quick-info modal accessible from the fleet calendar and roster.
+- **Quick-Info Unit Modal**: Click any unit in the fleet calendar or roster to open a modal showing cal status, project allocation, upcoming jobs, and deployment state — without leaving the page.
+- **Cal Date in Planner**: When a unit is selected for a monitoring location slot in the Job Planner, its calibration expiry date is now shown inline so you can spot near-expiry units before committing.
+- **Inline Seismograph Editing**: Unit rows in the seismograph dashboard now support inline editing of cal date, notes, and deployment status without navigating to the full detail page.
+
+### Migration Notes
+Run on each database before deploying:
+```bash
+docker compose exec terra-view python3 backend/migrate_add_allocated.py
+docker compose exec terra-view python3 backend/migrate_add_deployment_records.py
+```
+
+---
+
+## [0.9.1] - 2026-03-20
+
+### Fixed
+- **Location slots not persisting**: Empty monitoring location slots (no unit assigned yet) were lost on save/reload. Added `location_slots` JSON column to `job_reservations` to store the full slot list including empty slots.
+- **Modems in Recent Alerts**: Modems no longer appear in the dashboard Recent Alerts panel — alerts are for seismographs and SLMs only. Modem status is still tracked internally via paired device inheritance.
+- **Series 4 heartbeat `source_id`**: Updated heartbeat endpoint to accept the new `source_id` field from Series 4 units with fallback to the legacy field for backwards compatibility.
+
+### Migration Notes
+Run on each database before deploying:
+```bash
+docker compose exec terra-view python3 backend/migrate_add_location_slots.py
+```
+
+---
+
+## [0.9.0] - 2026-03-19
+
+### Added
+- **Job Planner**: Full redesign of the Fleet Calendar into a two-tab Job Planner / Calendar interface
+  - **Planner tab**: Create and manage job reservations with name, device type, dates, color, estimated units, and monitoring locations
+  - **Calendar tab**: 12-month rolling heatmap with colored job bars per day; confirmed jobs solid, planned jobs dashed
+  - **Monitoring Locations**: Each job has named location slots (filled = unit assigned, empty = needs a unit); progress shown as `2/5` with colored squares that fill as units are assigned
+  - **Estimated Units**: Separate planning number independent of actual location count; shown prominently on job cards
+  - **Fleet Summary panel**: Unit counts as clickable filter buttons; unit list shows reservation badges with job name, dates, and color
+  - **Available Units panel**: Shows units available for the job's date range when assigning
+  - **Smart color picker**: 18-swatch palette + custom color wheel; new jobs auto-pick a color maximally distant in hue from existing jobs
+  - **Job card progress**: `est. N · X/Y (Z more)` with filled/empty squares; amber → green when fully assigned
+  - **Promote to Project**: Promote a planned job to a tracked project directly from the planner form
+  - **Collapsible job details**: Name, dates, device type, color, project link, and estimated units collapse into a summary header
+  - **Calendar bar tooltips**: Hover any job bar to see job name and date range
+  - **Hash-based tab persistence**: `#cal` in URL restores Calendar tab on refresh; device type toggle preserves active tab
+  - **Auto-scroll to today**: Switching to Calendar tab smooth-scrolls to the current month
+  - **Upcoming project status**: New `upcoming` status for projects promoted from reservations
+- **Job device type**: Reservations carry a device type so they only appear on the correct calendar
+- **Project filtering by device type**: Projects only appear on the calendar matching their type (vibration → seismograph, sound → SLM, combined → both)
+- **Confirmed/Planned toggles**: Independent show/hide toggles for job bar layers on the calendar
+- **Cal expire dots toggle**: Calibration expiry dots off by default, togglable
+
+### Changed
+- **Renamed**: "Fleet Calendar" / "Reservation Planner" → **"Job Planner"** throughout UI and sidebar
+- **Project status dropdown**: Inline `<select>` in project header for quick status changes
+- **"All Projects" tab**: Shows everything except deleted; default view excludes archived/completed
+- **Toast notifications**: All `alert()` dialogs replaced with non-blocking toasts (green = success, red = error)
+
+### Migration Notes
+Run on each database before deploying:
+```bash
+docker compose exec terra-view python3 -c "
+import sqlite3
+conn = sqlite3.connect('/app/data/seismo_fleet.db')
+conn.execute('ALTER TABLE job_reservations ADD COLUMN estimated_units INTEGER')
+conn.commit()
+conn.close()
+"
+```
+
+---
+
+## [0.8.0] - 2026-03-18
+
+### Added
+- **Watcher Manager**: New admin page (`/admin/watchers`) for monitoring field watcher agents
+  - Live status cards per agent showing connectivity, version, IP, last-seen age, and log tail
+  - Trigger Update button to queue a self-update on the agent's next heartbeat
+  - Expand/collapse log tail with full-log expand mode
+  - Live surgical refresh every 30 seconds via `/api/admin/watchers` — no full page reload, open logs stay open
+
+### Changed
+- **Watcher status logic**: Agent status now reflects whether Terra-View is hearing from the watcher (ok if seen within 60 minutes, missing otherwise) — previously reflected the worst unit status from the last heartbeat payload, which caused false alarms when units went missing
+
+### Fixed
+- **Watcher Manager meta row**: Dark mode background was white due to invalid `dark:bg-slate-850` Tailwind class; corrected to `dark:bg-slate-800`
+
+---
+
+## [0.7.1] - 2026-03-12
+
+### Added
+- **"Out for Calibration" Unit Status**: New `out_for_cal` status for units currently away for calibration, with visual indicators in the roster, unit list, and seismograph stats panel
+- **Reservation Modal**: Fleet calendar reservation modal is now fully functional for creating and managing device reservations
+
+### Changed
+- **Retire Unit Button**: Redesigned to be more visually prominent/destructive to reduce accidental clicks
+
+### Fixed
+- **Migration Scripts**: Fixed database path references in several migration scripts
+- **Docker Compose**: Removed dev override file from the repository; dev environment config kept separate
+
+### Migration Notes
+Run the following migration script once per database before deploying:
+```bash
+python backend/migrate_add_out_for_calibration.py
+```
+
+---
+
+## [0.7.0] - 2026-03-07
+
+### Added
+- **Project Status Management**: Projects can now be placed `on_hold` or `archived`, with automatic cancellation of pending scheduled actions
+- **Hard Delete Projects**: Support for permanently deleting projects, in addition to soft-delete with auto-pruning
+- **Vibration Location Detail**: New dedicated template for vibration project location detail views
+- **Vibration Project Isolation**: Vibration projects no longer show SLM-specific project tabs
+- **Manual SD Card Data Upload**: Upload offline NRL data directly from SD card via ZIP or multi-file select
+  - Accepts `.rnd`/`.rnh` files; parses `.rnh` metadata for session start/stop times, serial number, and store name
+  - Creates `MonitoringSession` and `DataFile` records automatically; no unit assignment required
+  - Upload panel on NRL detail Data Files tab with inline feedback and auto-refresh via HTMX
+- **Standalone SLM Type**: New SLM device mode that operates without a modem (direct IP connection)
+- **NL32 Data Support**: Report generator and web viewer now support NL32 measurement data format
+- **Combined Report Wizard**: Multi-session combined Excel report generation tool
+  - Wizard UI grouped by location with period type badges (day/night)
+  - Each selected session produces one `.xlsx` in a ZIP archive
+  - Period type filtering: day sessions keep last calendar date (7AM–6:59PM); night sessions span both days (7PM–6:59AM)
+- **Combined Report Preview**: Interactive spreadsheet-style preview before generating combined reports
+- **Chart Preview**: Live chart preview in the report generator matching final report styling
+- **SLM Model Schemas**: Per-model configuration schemas for NL32, NL43, NL53 devices
+- **Data Collection Mode**: Projects now store a data collection mode field with UI controls and migration
+
+### Changed
+- **MonitoringSession rename**: `RecordingSession` renamed to `MonitoringSession` throughout codebase; DB table renamed from `recording_sessions` to `monitoring_sessions`
+  - Migration: `backend/migrate_rename_recording_to_monitoring_sessions.py`
+- **Combined Report Split Logic**: Separate days now generate separate `.xlsx` files; NRLs remain one per sheet
+- **Mass Upload Parsing**: Smarter file filtering — no longer imports unneeded Lp files or `.xlsx` files
+- **SLM Start Time Grace Period**: 15-minute grace window added so data starting at session start time is included
+- **NL32 Date Parsing**: Date now read from `start_time` field instead of file metadata
+- **Project Data Labels**: Improved Jinja filters and UI label clarity for project data views
+
+### Fixed
+- **Dev/Prod Separation**: Dev server now uses Docker Compose override; production deployment no longer affected by dev config
+- **SLM Modal**: Bench/deploy toggle now correctly shown in SLM unit modal
+- **Auto-Downloaded Files**: Files downloaded by scheduler now appear in project file listings
+- **Duplicate Download**: Removed duplicate file download that occurred following a scheduled stop
+- **SLMM Environment Variables**: `TCP_IDLE_TTL` and `TCP_MAX_AGE` now correctly passed to SLMM service via docker-compose
+
+### Technical Details
+- `session_label` and `period_type` stored on `monitoring_sessions` table (migration: `migrate_add_session_period_type.py`)
+- `device_model` stored on `monitoring_sessions` table (migration: `migrate_add_session_device_model.py`)
+- Upload endpoint: `POST /api/projects/{project_id}/nrl/{location_id}/upload-data`
+- ZIP filename format: `{session_label}_{project_name}_report.xlsx` (label first)
+
+### Migration Notes
+Run the following migration scripts once per database before deploying:
+```bash
+python backend/migrate_rename_recording_to_monitoring_sessions.py
+python backend/migrate_add_session_period_type.py
+python backend/migrate_add_session_device_model.py
+```
+
+---
+
+## [0.6.1] - 2026-02-16
+
+### Added
+- **One-Off Recording Schedules**: Support for scheduling single recordings with specific start and end datetimes
+- **Bidirectional Pairing Sync**: Pairing a device with a modem now automatically updates both sides, clearing stale pairings when reassigned
+- **Auto-Fill Notes from Modem**: Notes are now copied from modem to paired device when fields are empty
+- **SLMM Download Requests**: New `_download_request` method in SLMM client for binary file downloads with local save
+
+### Fixed
+- **Scheduler Timezone**: One-off scheduler times now use local time instead of UTC
+- **Pairing Consistency**: Old device references are properly cleared when a modem is re-paired to a new device
+
+## [0.6.0] - 2026-02-06
+
+### Added
+- **Calendar & Reservation Mode**: Fleet calendar view with reservation system for scheduling device deployments
+- **Device Pairing Interface**: New two-column pairing page (`/pair-devices`) for linking recorders (seismographs/SLMs) with modems
+  - Visual pairing interface with drag-and-drop style interactions
+  - Fuzzy-search modem pairing for SLMs
+  - Pairing options now accessible from modem page
+  - Improved pair status sharing across views
+- **Modem Dashboard Enhancements**:
+  - Modem model number now a dedicated configuration field with per-model options
+  - Direct link to modem login page from unit detail view
+  - Modem view converted to list format
+- **Seismograph List Improvements**:
+  - Enhanced visibility with better filtering and sorting
+  - Calibration dates now color-coded for quick status assessment
+  - User sets date of previous calibration (not expiry) for clearer workflow
+- **SLMM Device Control Lock**: Prevents command flooding to NL-43 devices
+
+### Changed
+- **Calibration Date UX**: Users now set the date of the previous calibration rather than upcoming expiry dates - more intuitive workflow
+- **Settings Persistence**: Settings save no longer reloads the page
+- **Tab State**: Tab state now persists in URL hash for better navigation
+- **Scheduler Management**: Schedule changes now cascade to individual events
+- **Dashboard Filtering**: Enhanced dashboard with additional filtering options and SLM status sync
+- **SLMM Polling Intervals**: Fixed and improved polling intervals for better responsiveness
+- **24-Hour Scheduler Cycle**: Improved cycle handling to prevent issues with scheduled downloads
+
+### Fixed
+- **SLM Modal Fields**: Modal now only contains correct device-specific fields
+- **IP Address Handling**: IP address correctly passed via modem pairing
+- **Mobile Type Display**: Fixed incorrect device type display in roster and device tables
+- **SLMM Scheduled Downloads**: Fixed issues with scheduled download operations
+
+## [0.5.1] - 2026-01-27
+
+### Added
+- **Dashboard Schedule View**: Today's scheduled actions now display directly on the main dashboard
+  - New "Today's Actions" panel showing upcoming and past scheduled events
+  - Schedule list partial for project-specific schedule views
+  - API endpoint for fetching today's schedule data
+- **New Branding Assets**: Complete logo rework for Terra-View
+  - New Terra-View logos for light and dark themes
+  - Retina-ready (@2x) logo variants
+  - Updated favicons (16px and 32px)
+  - Refreshed PWA icons (72px through 512px)
+
+### Changed
+- **Dashboard Layout**: Reorganized to include schedule information panel
+- **Base Template**: Updated to use new Terra-View logos with theme-aware switching
+
+## [0.5.0] - 2026-01-23
+
+_Note: This version was not formally released; changes were included in v0.5.1._
+
+## [0.4.4] - 2026-01-23
+
+### Added
+- **Recurring schedules**: New scheduler service, recurring schedule APIs, and schedule templates (calendar/interval/list).
+- **Alerts UI + backend**: Alerting service plus dropdown/list templates for surfacing notifications.
+- **Report templates + viewers**: CRUD API for report templates, report preview screen, and RND file viewer.
+- **SLM tooling**: SLM settings modal and SLM project report generator workflow.
+
+### Changed
+- **Project data management**: Unified files view, refreshed FTP browser, and new project header/templates for file/session/unit/assignment lists.
+- **Device/SLM sync**: Standardized SLM device types and tightened SLMM sync paths.
+- **Docs/scripts**: Cleanup pass and expanded device-type documentation.
+
+### Fixed
+- **Scheduler actions**: Strict command definitions so actions run reliably.
+- **Project view title**: Resolved JSON string rendering in project headers.
+
+## [0.4.3] - 2026-01-14
+
+### Added
+- **Sound Level Meter roster tooling**: Roster manager surfaces SLM metadata, supports rename unit flows, and adds return-to-project navigation to keep SLM dashboard users oriented.
+- **Project management templates**: New schedule and unit list templates plus file/session lists show what each project stores before teams dive into deployments.
+
+### Changed
+- **Project view refresh**: FTP browser now downloads folders locally, the countdown timer was rebuilt, and project/device templates gained edit modals for projects and locations so navigation feels smoother.
+- **SLM control sync & accuracy**: Control center groundwork now runs inside the dev UI, configuration edits propagate to SLMM (which caches configs for faster responses), and the SLM live view reads the correct DRD fields after the refactor.
+
+### Fixed
+- **SLM UI syntax bug**: Resolved the unexpected token error that appeared in the refreshed SLM components.
+
+## [0.4.2] - 2026-01-05
+
+### Added
+- **SLM Configuration Interface**: Sound Level Meters can now be configured directly from the SLM dashboard
+  - Configuration modal with comprehensive SLM parameter editing
+  - TCP port configuration for SLM control connections (default: 2255)
+  - FTP port configuration for SLM data retrieval (default: 21)
+  - Modem assignment for network access or direct IP connection support
+  - Test Modem button with ping-based connectivity verification (shows IP and response time)
+  - Test SLM Connection button for end-to-end connectivity validation
+  - Dynamic form fields that hide/show based on modem selection
+- **SLM Dashboard Endpoints**: New API routes for SLM management
+  - `GET /api/slm-dashboard/config/{unit_id}` - Load SLM configuration form
+  - `POST /api/slm-dashboard/config/{unit_id}` - Save SLM configuration
+  - `GET /api/slm-dashboard/test-modem/{modem_id}` - Ping modem for connectivity test
+- **Database Schema Updates**: Added `slm_ftp_port` column to roster table
+  - Migration script: `scripts/add_slm_ftp_port.py`
+  - Supports both TCP (control) and FTP (data) port configuration per SLM unit
+- **Docker Environment Enhancements**:
+  - Added `iputils-ping` and `curl` packages to Docker image for network diagnostics
+  - Health check endpoint support via curl
+
+### Fixed
+- **Form Validation**: Fixed 400 Bad Request error when adding modem units
+  - Form fields for device-specific parameters now properly disabled when hidden
+  - Empty string values for integer fields no longer cause validation failures
+  - JavaScript now disables hidden form sections to prevent unwanted data submission
+- **Unit Status Accuracy**: Fixed issue where unit status was loading from a saved cache instead of actual last-heard time
+  - Unit status now accurately reflects real-time connectivity
+  - Status determination based on actual `slm_last_check` timestamp
+
+### Changed
+- **Roster Form Behavior**: Device-specific form fields are now disabled (not just hidden) when not applicable
+  - Prevents SLM fields from submitting when adding modems
+  - Prevents modem fields from submitting when adding SLMs
+  - Cleaner form submissions with only relevant data
+- **Port Field Handling**: Backend now accepts port fields as strings and converts to integers
+  - Handles empty string values gracefully
+  - Proper type conversion with None fallback for empty values
+
+### Technical Details
+- Added `setFieldsDisabled()` helper function for managing form field state
+- Updated `toggleDeviceFields()` and `toggleEditDeviceFields()` to disable/enable fields
+- Backend type conversion: `slm_tcp_port` and `slm_ftp_port` accept strings, convert to int with empty string handling
+- Modem ping uses subprocess with 1 packet, 2-second timeout, returns response time in milliseconds
+- Configuration form uses 3-column grid layout for TCP Port, FTP Port, and Direct IP fields
+
+## [0.4.1] - 2026-01-05
+### Added
+- **SLM Integration**: Sound Level Meters are now manageable in SFM
+
+### Fixed
+- Fixed an issue where unit status was loading from a saved cache and not based on when it was actually heard from last. Unit status is now accurate.
+
+
+## [0.4.0] - 2025-12-16
+
+### Added
+- **Database Management System**: Comprehensive backup and restore capabilities
+  - **Manual Snapshots**: Create on-demand backups of the entire database with optional descriptions
+  - **Restore from Snapshot**: Restore database from any snapshot with automatic safety backup
+  - **Upload/Download Snapshots**: Transfer database snapshots to/from the server
+  - **Database Tab**: New dedicated tab in Settings for all database management operations
+  - **Database Statistics**: View database size, row counts by table, and last modified time
+  - **Snapshot Metadata**: Each snapshot includes creation time, description, size, and type (manual/automatic)
+  - **Safety Backups**: Automatic backup created before any restore operation
+- **Remote Database Cloning**: Dev tools for cloning production database to remote development servers
+  - **Clone Script**: `scripts/clone_db_to_dev.py` for copying database over WAN
+  - **Network Upload**: Upload snapshots via HTTP to remote servers
+  - **Auto-restore**: Automatically restore uploaded database on target server
+  - **Authentication Support**: Optional token-based authentication for secure transfers
+- **Automatic Backup Scheduler**: Background service for automated database backups
+  - **Configurable Intervals**: Set backup frequency (default: 24 hours)
+  - **Retention Management**: Automatically delete old backups (configurable keep count)
+  - **Manual Trigger**: Force immediate backup via API
+  - **Status Monitoring**: Check scheduler status and next scheduled run time
+  - **Background Thread**: Non-blocking operation using Python threading
+- **Settings Reorganization**: Improved tab structure for better organization
+  - Renamed "Data Management" tab to "Roster Management"
+  - Moved CSV Replace Mode from Advanced tab to Roster Management tab
+  - Created dedicated Database tab for all backup/restore operations
+- **Comprehensive Documentation**: New `docs/DATABASE_MANAGEMENT.md` guide covering:
+  - Manual snapshot creation and restoration workflows
+  - Download/upload procedures for off-site backups
+  - Remote database cloning setup and usage
+  - Automatic backup configuration and integration
+  - API reference for all database endpoints
+  - Best practices and troubleshooting guide
+
+### Changed
+- **Settings Tab Organization**: Restructured for better logical grouping
+  - **General**: Display preferences (timezone, theme, auto-refresh)
+  - **Roster Management**: CSV operations and roster table (now includes Replace Mode)
+  - **Database**: All backup/restore operations (NEW)
+  - **Advanced**: Power user settings (calibration, thresholds)
+  - **Danger Zone**: Destructive operations
+- CSV Replace Mode warnings enhanced and moved to Roster Management context
+
+### Technical Details
+- **SQLite Backup API**: Uses native SQLite backup API for concurrent-safe snapshots
+- **Metadata Tracking**: JSON sidecar files store snapshot metadata alongside database files
+- **Atomic Operations**: Database restoration is atomic with automatic rollback on failure
+- **File Structure**: Snapshots stored in `./data/backups/` with timestamped filenames
+- **API Endpoints**: 7 new endpoints for database management operations
+- **Backup Service**: `backend/services/database_backup.py` - Core backup/restore logic
+- **Scheduler Service**: `backend/services/backup_scheduler.py` - Automatic backup automation
+- **Clone Utility**: `scripts/clone_db_to_dev.py` - Remote database synchronization tool
+
+### Security Considerations
+- Snapshots contain full database data and should be secured appropriately
+- Remote cloning supports optional authentication tokens
+- Restore operations require safety backup creation by default
+- All destructive operations remain in Danger Zone with warnings
+
+### Migration Notes
+No database migration required for v0.4.0. All new features use existing database structure and add new backup management capabilities without modifying the core schema.
+
+## [0.3.3] - 2025-12-12
+
+### Changed
+- **Mobile Navigation**: Moved hamburger menu button from floating top-right to bottom navigation bar
+  - Bottom nav now shows: Menu (hamburger), Dashboard, Roster, Settings
+  - Removed "Add Unit" from bottom nav (still accessible via sidebar menu)
+  - Hamburger no longer floats over content on mobile
+- **Status Dot Visibility**: Increased status dot size from 12px to 16px (w-3/h-3 → w-4/h-4) in dashboard fleet overview for better at-a-glance visibility
+  - Affects both Active and Benched tabs in dashboard
+  - Makes status colors (green/yellow/red) easier to spot during quick scroll
+
+### Fixed
+- **Location Navigation**: Moved tap-to-navigate functionality from roster card view to unit detail modal only
+  - Roster cards now show simple location text with pin emoji
+  - Navigation links (opening Maps app) only appear in the modal when tapping a unit
+  - Reduces visual clutter and accidental navigation triggers
+
+### Technical Details
+- Bottom navigation remains at 4 buttons, first button now triggers sidebar menu
+- Removed standalone hamburger button element and associated CSS
+- Modal already had navigation links, no changes needed there
+
+## [0.3.2] - 2025-12-12
+
+### Added
+- **Progressive Web App (PWA) Mobile Optimization**: Complete mobile-first redesign for field deployment usage
+  - **Responsive Navigation**: Hamburger menu with slide-in sidebar for mobile, always-visible sidebar for desktop
+  - **Bottom Navigation Bar**: Quick access to Dashboard, Roster, Add Unit, and Settings (mobile only)
+  - **Mobile Card View**: Compact card layout for roster units with status dots, location, and project ID
+  - **Tap-to-Navigate**: Location addresses and coordinates are clickable and open in user's default navigation app (Google Maps, Apple Maps, Waze, etc.)
+  - **Unit Detail Modal**: Bottom sheet modal showing full unit details with edit capabilities (tap any unit card to open)
+  - **Touch Optimization**: 44x44px minimum button targets following iOS/Android accessibility guidelines
+  - **Service Worker**: Network-first caching strategy for offline-capable operation
+  - **IndexedDB Storage**: Offline data persistence for unit information and pending edits
+  - **Background Sync**: Queues edits made while offline and syncs automatically when connection returns
+  - **Offline Indicator**: Visual banner showing offline status with manual sync button
+  - **PWA Manifest**: Installable as a standalone app on mobile devices with custom icons
+  - **Hard Reload Button**: "Clear Cache & Reload" utility in sidebar menu to force fresh JavaScript/CSS
+- **Mobile-Specific Files**:
+  - `backend/static/mobile.css` - Mobile UI styles, hamburger menu, bottom nav, cards, modals
+  - `backend/static/mobile.js` - Mobile interactions, offline sync, modal management
+  - `backend/static/sw.js` - Service worker for PWA functionality
+  - `backend/static/offline-db.js` - IndexedDB wrapper for offline storage
+  - `backend/static/manifest.json` - PWA configuration
+  - `backend/static/icons/` - 8 PWA icon sizes (72px-512px)
+
+### Changed
+- **Dashboard Alerts**: Only show Missing units in notifications (Pending units no longer appear in alerts)
+- **Roster Template**: Mobile card view shows status from server-side render instead of fetching separately
+- **Mobile Status Display**: Benched units show "Benched" label instead of "Unknown" or "N/A"
+- **Base Template**: Added cache-busting query parameters to JavaScript files (e.g., `mobile.js?v=0.3.2`)
+- **Sidebar Menu**: Added utility section with "Toggle theme" and "Clear Cache & Reload" buttons
+
+### Fixed
+- **Modal Status Display**: Fixed unit detail modal showing "Unknown" status by passing status data from card to modal
+- **Mobile Card Status**: Fixed grey dot with "Unknown" label for benched units - now properly shows deployment state
+- **Status Data Passing**: Roster cards now pass status and age to modal via function parameters and global status map
+- **Service Worker Caching**: Aggressive browser caching issue resolved with version query parameters and hard reload function
+
+### Technical Details
+- Mobile breakpoint at 768px (`md:` prefix in TailwindCSS)
+- PWA installable via Add to Home Screen on iOS/Android
+- Service worker caches all static assets with network-first strategy
+- Google Maps search API used for universal navigation links (works across all map apps)
+- Status map stored in `window.rosterStatusMap` from server-side rendered data
+- Hard reload function clears service worker caches, unregisters workers, and deletes IndexedDB
+
+## [0.3.1] - 2025-12-12
+
+### Fixed
+- **Dashboard Notifications**: Removed Pending units from alert list - only Missing units now trigger notifications
+- **Status Dots**: Verified deployed units display correct status dots (OK=green, Pending=yellow, Missing=red) in both active and benched tables
+- **Mobile Card View**: Fixed roster cards showing "Unknown" status by using `.get()` with defaults in backend routes
+- **Backend Status Handling**: Added default values for status, age, last_seen fields to prevent KeyError exceptions
+
+### Changed
+- Backend roster partial routes (`/partials/roster-deployed`, `/partials/roster-benched`) now use `.get()` method with sensible defaults
+- Deployed units default to "Unknown" status when data unavailable
+- Benched units default to "N/A" status when data unavailable
+
+## [0.3.0] - 2025-12-09
+
+### Added
+- **Series 4 (Micromate) Support**: New `/api/series4/heartbeat` endpoint for receiving telemetry from Series 4 Micromate units
+  - Auto-detection of Series 4 units via UM##### ID pattern
+  - Stores project hints from emitter payload in unit notes
+  - Automatic unit type classification across both Series 3 and Series 4 endpoints
+- **Development Environment Labels**: Visual indicators to distinguish dev from production deployments
+  - Yellow "DEV" badge in sidebar navigation
+  - "[DEV]" prefix in browser title
+  - Yellow banner on dashboard when running in development mode
+  - Environment variable support in docker-compose.yml (ENVIRONMENT=production|development)
+- **Quality of Life Improvements**:
+  - Human-readable relative timestamps (e.g., "2h 15m ago", "3d ago") with full date in tooltips
+  - "Last Updated" timestamp indicator on dashboard
+  - Status icons for colorblind accessibility (checkmark for OK, clock for Pending, X for Missing)
+  - Breadcrumb navigation on unit detail pages
+  - Copy-to-clipboard buttons for unit IDs
+  - Search/filter functionality for fleet roster table
+  - Improved empty state messages with icons
+- **Timezone Support**: Comprehensive timezone handling across the application
+  - Timezone selector in Settings (defaults to America/New_York EST)
+  - Human-readable timestamp format (e.g., "9/10/2020 8:00 AM EST")
+  - Timezone-aware display for all timestamps site-wide
+  - Settings stored in localStorage for immediate effect
+- **Settings Page Redesign**: Complete overhaul with tabbed interface and persistent preferences
+  - **General Tab**: Display preferences (timezone, theme, auto-refresh interval)
+  - **Data Management Tab**: Safe operations (CSV export, merge import, roster table)
+  - **Advanced Tab**: Power user settings (replace mode import, calibration defaults, status thresholds)
+  - **Danger Zone Tab**: Destructive operations isolated with enhanced warnings
+  - Backend preferences storage via new UserPreferences model
+  - Tab state persistence in localStorage
+  - Smooth animations and consistent styling with existing pages
+- **User Preferences API**: New backend endpoints for persistent settings storage
+  - `GET /api/settings/preferences` - Retrieve all user preferences
+  - `PUT /api/settings/preferences` - Update preferences (supports partial updates)
+  - Database-backed storage for cross-device preference sync
+  - Migration script: `backend/migrate_add_user_preferences.py`
+
+### Changed
+- Timestamps now display in user-selected timezone with human-readable format throughout the application
+- Settings page reorganized from 644-line flat layout to clean 4-tab interface
+- CSV Replace Mode moved from Data Management to Advanced tab with additional warnings
+- Import operations separated: safe merge in Data Management tab, destructive replace in Advanced tab
+- Page title changed from "Roster Manager" to "Settings" for better clarity
+- All preferences now persist to backend database instead of relying solely on localStorage
+
+### Fixed
+- Unit type classification now consistent across Series 3 and Series 4 heartbeat endpoints
+- Auto-correction of misclassified unit types when they report to wrong endpoint
+
+### Technical Details
+- New `detect_unit_type()` helper function for pattern-based unit classification
+- UserPreferences model with single-row table pattern (id=1) for global settings
+- Series 4 units identified by UM prefix followed by digits (e.g., UM11719)
+- JavaScript Intl API used for client-side timezone conversion
+- Pydantic schema for partial preference updates (PreferencesUpdate model)
+- Environment context injection via custom FastAPI template response wrapper
+
+## [0.2.1] - 2025-12-03
+
+### Added
+- `/settings` roster manager page with CSV export/import, live stats, and danger-zone reset controls.
+- `/api/settings` router that exposes `export-csv`, `stats`, `roster-units`, `import-csv-replace`, and the clear-* endpoints backing the UI.
+- Dedicated HTMX partials/tabs for deployed, benched, retired, and ignored units plus new ignored-table UI to unignore or delete entries.
+
+### Changed
+- Roster and unit detail templates now display device-type specific metadata (calibration windows, modem pairings, IP/phone fields) alongside inline actions.
+- Base navigation highlights the new settings workflow and routes retired/ignored buckets through dedicated endpoints + partials.
+
+### Fixed
+- Snapshot summary counts only consider deployed units, preventing dashboard alerts from including benched hardware.
+- Snapshot payloads now include address/coordinate metadata so map widgets and CSV exports stay accurate.
+
+## [0.2.0] - 2025-12-03
+
+### Added
+- Device-type aware roster schema (seismographs vs modems) with new metadata columns plus `backend/migrate_add_device_types.py` for upgrading existing SQLite files.
+- `create_test_db.py` helper that generates a ready-to-use demo database with sample seismographs, modems, and emitter rows.
+- Ignore list persistence/API so noisy legacy emitters can be quarantined via `/api/roster/ignore` and surfaced in the UI.
+- Roster page enhancements: Add Unit modal, CSV import modal, and HTMX-powered table fed by `/partials/roster-table`.
+- Unit detail view rewritten to fetch data via API, expose deployment status, and allow edits to all metadata.
+
+### Changed
+- Snapshot service now merges roster + emitter data into active/benched/retired/unknown buckets and includes device-specific metadata in each record.
+- Roster edit endpoints parse date fields, manage modem/seismograph specific attributes, and guarantee records exist when toggling deployed/retired states.
+- Dashboard partial endpoints are grouped under `/dashboard/*` so HTMX tabs stay in sync with the consolidated snapshot payload.
+
+### Fixed
+- Toggling deployed/retired flags no longer fails when a unit does not exist because the router now auto-creates placeholder roster rows.
+- CSV import applies address/coordinate updates instead of silently dropping unknown columns.
+
+## [0.1.1] - 2025-12-02
+
+### Added
+- **Roster Editing API**: Full CRUD operations for roster management
+  - `POST /api/roster/add` - Add new units to roster
+  - `POST /api/roster/set-deployed/{unit_id}` - Toggle deployment status
+  - `POST /api/roster/set-retired/{unit_id}` - Toggle retired status
+  - `POST /api/roster/set-note/{unit_id}` - Update unit notes
+- **CSV Import**: Bulk roster import functionality
+  - `POST /api/roster/import-csv` - Import units from CSV file
+  - Support for all roster fields: unit_id, unit_type, deployed, retired, note, project_id, location
+  - Optional update_existing parameter to control duplicate handling
+  - Detailed import summary with added/updated/skipped/error counts
+- **Enhanced Database Models**:
+  - Added `project_id` field to RosterUnit model
+  - Added `location` field to RosterUnit model
+  - Added `last_updated` timestamp tracking
+- **Dashboard Enhancements**:
+  - Separate views for Active, Benched, and Retired units
+  - New endpoints: `/dashboard/active` and `/dashboard/benched`
+
+### Fixed
+- Database session management bug in `emit_status_snapshot()`
+  - Added `get_db_session()` helper function for direct session access
+  - Implemented proper session cleanup with try/finally blocks
+- Database schema synchronization issues
+  - Database now properly recreates when model changes are detected
+
+### Changed
+- Updated RosterUnit model to include additional metadata fields
+- Improved error handling in CSV import with row-level error reporting
+- Enhanced snapshot service to properly manage database connections
+
+### Technical Details
+- All roster editing endpoints use Form data for better HTML form compatibility
+- CSV import uses multipart/form-data for file uploads
+- Boolean fields in CSV accept: 'true', '1', 'yes' (case-insensitive)
+- Database sessions now properly closed to prevent connection leaks
+
+## [0.1.0] - 2024-11-20
+
+### Added
+- Initial release of Seismo Fleet Manager
+- FastAPI-based REST API for fleet management
+- SQLite database with SQLAlchemy ORM
+- Emitter reporting endpoints
+- Basic fleet status monitoring
+- Docker and Docker Compose support
+- Web-based dashboard with HTMX
+- Dark/light mode toggle
+- Interactive maps with Leaflet
+- Photo management per unit
+- Automated status categorization (OK/Pending/Missing)
+
+[0.7.0]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.6.1...v0.7.0
+[0.6.0]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.5.1...v0.6.0
+[0.5.1]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.5.0...v0.5.1
+[0.5.0]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.4.4...v0.5.0
+[0.4.4]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.4.3...v0.4.4
+[0.4.3]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.4.2...v0.4.3
+[0.4.2]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.4.1...v0.4.2
+[0.4.1]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.4.0...v0.4.1
+[0.4.0]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.3.3...v0.4.0
+[0.3.3]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.3.2...v0.3.3
+[0.3.2]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.3.1...v0.3.2
+[0.3.1]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.2.1...v0.3.0
+[0.2.1]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.1.1...v0.2.0
+[0.1.1]: https://github.com/serversdwn/seismo-fleet-manager/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/serversdwn/seismo-fleet-manager/releases/tag/v0.1.0

Dockerfile

@@ -0,0 +1,28 @@
+FROM python:3.11-slim
+
+# Build number for dev builds (injected via --build-arg)
+ARG BUILD_NUMBER=0
+ENV BUILD_NUMBER=${BUILD_NUMBER}
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies (ping for network diagnostics)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends iputils-ping curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Install dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Expose port
+EXPOSE 8001
+
+# Run the application using the new backend structure
+CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "8001"]

FRONTEND_README.md

@@ -0,0 +1,303 @@
+# Seismo Fleet Manager - Frontend Documentation
+
+## Overview
+
+This is the MVP frontend scaffold for **Seismo Fleet Manager**, built with:
+- **FastAPI** (backend framework)
+- **HTMX** (dynamic updates without JavaScript frameworks)
+- **TailwindCSS** (utility-first styling)
+- **Jinja2** (server-side templating)
+- **Leaflet** (interactive maps)
+
+No React, Vue, or other frontend frameworks are used.
+
+## Project Structure
+
+```
+seismo-fleet-manager/
+├── backend/
+│   ├── main.py                 # FastAPI app entry point
+│   ├── routers/
+│   │   ├── roster.py          # Fleet roster endpoints
+│   │   ├── units.py           # Individual unit endpoints
+│   │   └── photos.py          # Photo management endpoints
+│   ├── services/
+│   │   └── snapshot.py        # Mock status snapshot (replace with real logic)
+│   ├── static/
+│   │   └── style.css          # Custom CSS
+│   ├── database.py            # SQLAlchemy database setup
+│   ├── models.py              # Database models
+│   └── routes.py              # Legacy API routes
+├── templates/
+│   ├── base.html              # Base layout with sidebar & dark mode
+│   ├── dashboard.html         # Main dashboard page
+│   ├── roster.html            # Fleet roster page
+│   ├── unit_detail.html       # Unit detail page
+│   └── partials/
+│       └── roster_table.html  # HTMX partial for roster table
+├── data/
+│   └── photos/                # Photo storage (organized by unit_id)
+└── requirements.txt
+```
+
+## Running the Application
+
+### Install Dependencies
+
+```bash
+pip install -r requirements.txt
+```
+
+### Run the Server
+
+```bash
+uvicorn backend.main:app --host 0.0.0.0 --port 8001 --reload
+```
+
+The application will be available at:
+- **Web UI**: http://localhost:8001/
+- **API Docs**: http://localhost:8001/docs
+- **Health Check**: http://localhost:8001/health
+
+## Features
+
+### 1. Dashboard (`/`)
+
+The main dashboard provides an at-a-glance view of the fleet:
+
+- **Fleet Summary Card**: Total units, deployed units, status breakdown
+- **Recent Alerts Card**: Shows units with Missing or Pending status
+- **Recent Photos Card**: Placeholder for photo gallery
+- **Fleet Status Preview**: Quick view of first 5 units
+
+**Auto-refresh**: Dashboard updates every 10 seconds via HTMX
+
+### 2. Fleet Roster (`/roster`)
+
+A comprehensive table view of all seismograph units:
+
+**Columns**:
+- Status indicator (colored dot: green=OK, yellow=Pending, red=Missing)
+- Deployment indicator (blue dot if deployed)
+- Unit ID
+- Last seen timestamp
+- Age since last contact
+- Notes
+- Actions (View detail button)
+
+**Features**:
+- Auto-refresh every 10 seconds
+- Sorted by priority (Missing > Pending > OK)
+- Click any row to view unit details
+
+### 3. Unit Detail Page (`/unit/{unit_id}`)
+
+Split-screen layout with detailed information:
+
+**Left Column**:
+- Status card with real-time updates
+- Deployment status
+- Last contact time and file
+- Notes section
+- Editable metadata (mock form)
+
+**Right Column - Tabbed Interface**:
+- **Photos Tab**: Primary photo with thumbnail gallery
+- **Map Tab**: Interactive Leaflet map showing unit location
+- **History Tab**: Placeholder for event history
+
+**Auto-refresh**: Unit data updates every 10 seconds
+
+### 4. Dark/Light Mode
+
+Toggle button in sidebar switches between themes:
+- Uses Tailwind's `dark:` classes
+- Preference saved to localStorage
+- Smooth transitions on theme change
+
+## API Endpoints
+
+### Status & Fleet Data
+
+```http
+GET /api/status-snapshot
+```
+Returns complete fleet status snapshot with statistics.
+
+```http
+GET /api/roster
+```
+Returns sorted list of all units for roster table.
+
+```http
+GET /api/unit/{unit_id}
+```
+Returns detailed information for a single unit including coordinates.
+
+### Photo Management
+
+```http
+GET /api/unit/{unit_id}/photos
+```
+Returns list of photos for a unit, sorted by recency.
+
+```http
+GET /api/unit/{unit_id}/photo/{filename}
+```
+Serves a specific photo file.
+
+### Legacy Endpoints
+
+```http
+POST /emitters/report
+```
+Endpoint for emitters to report status (from original backend).
+
+```http
+GET /fleet/status
+```
+Returns database-backed fleet status (from original backend).
+
+## Mock Data
+
+### Location: `backend/services/snapshot.py`
+
+The `emit_status_snapshot()` function currently returns mock data with 8 units:
+
+- **BE1234**: OK, deployed (San Francisco)
+- **BE5678**: Pending, deployed (Los Angeles)
+- **BE9012**: Missing, deployed (New York)
+- **BE3456**: OK, benched (Chicago)
+- **BE7890**: OK, deployed (Houston)
+- **BE2468**: Pending, deployed
+- **BE1357**: OK, benched
+- **BE8642**: Missing, deployed
+
+**To replace with real data**: Update the `emit_status_snapshot()` function to call your Series3 emitter logic.
+
+## Styling
+
+### Color Palette
+
+The application uses your brand colors:
+
+```css
+orange:   #f48b1c
+navy:     #142a66
+burgundy: #7d234d
+```
+
+These are configured in the Tailwind config as `seismo-orange`, `seismo-navy`, `seismo-burgundy`.
+
+### Cards
+
+All cards use the consistent styling:
+```html
+<div class="rounded-xl shadow-lg bg-white dark:bg-slate-800 p-6">
+```
+
+### Status Indicators
+
+- Green dot: OK status
+- Yellow dot: Pending status
+- Red dot: Missing status
+- Blue dot: Deployed
+- Gray dot: Benched
+
+## HTMX Usage
+
+HTMX enables dynamic updates without writing JavaScript:
+
+### Auto-refresh Example (Dashboard)
+
+```html
+<div hx-get="/api/status-snapshot"
+     hx-trigger="load, every 10s"
+     hx-swap="none"
+     hx-on::after-request="updateDashboard(event)">
+```
+
+This fetches the snapshot on page load and every 10 seconds, then calls a JavaScript function to update the DOM.
+
+### Partial Template Loading (Roster)
+
+```html
+<div hx-get="/partials/roster-table"
+     hx-trigger="load, every 10s"
+     hx-swap="innerHTML">
+```
+
+This replaces the entire inner HTML with the server-rendered roster table every 10 seconds.
+
+## Adding Photos
+
+To add photos for a unit:
+
+1. Create a directory: `data/photos/{unit_id}/`
+2. Add image files (jpg, jpeg, png, gif, webp)
+3. Photos will automatically appear on the unit detail page
+4. Most recent file becomes the primary photo
+
+Example:
+```bash
+mkdir -p data/photos/BE1234
+cp my-photo.jpg data/photos/BE1234/deployment-site.jpg
+```
+
+## Customization
+
+### Adding New Pages
+
+1. Create a template in `templates/`
+2. Add a route in `backend/main.py`:
+
+```python
+@app.get("/my-page", response_class=HTMLResponse)
+async def my_page(request: Request):
+    return templates.TemplateResponse("my_page.html", {"request": request})
+```
+
+3. Add a navigation link in `templates/base.html`
+
+### Adding New API Endpoints
+
+1. Create a router file in `backend/routers/`
+2. Include the router in `backend/main.py`:
+
+```python
+from backend.routers import my_router
+app.include_router(my_router.router)
+```
+
+## Docker Deployment
+
+The project includes Docker configuration:
+
+```bash
+docker-compose up
+```
+
+This will start the application on port 8001 (configured to avoid conflicts with port 8000).
+
+## Next Steps
+
+1. **Replace Mock Data**: Update `backend/services/snapshot.py` with real Series3 emitter logic
+2. **Database Integration**: The existing SQLAlchemy models can store historical data
+3. **Photo Upload**: Add a form to upload photos from the UI
+4. **Projects Management**: Implement the "Projects" page
+5. **Settings**: Add user preferences and configuration
+6. **Event History**: Populate the History tab with real event data
+7. **Authentication**: Add user login/authentication if needed
+8. **Notifications**: Add real-time alerts for critical status changes
+
+## Development Tips
+
+- The `--reload` flag auto-reloads the server when code changes
+- Use browser DevTools to debug HTMX requests (look for `HX-Request` headers)
+- Check `/docs` for interactive API documentation (Swagger UI)
+- Dark mode state persists in browser localStorage
+- All timestamps are currently mock data - replace with real values
+
+## License
+
+See main README.md for license information.

README.md

@@ -1,2 +1,638 @@
-# seismo-fleet-manager
-Web app and backend for tracking deployed units.
+# Terra-View v0.9.3
+Backend API and HTMX-powered web interface for managing a mixed fleet of seismographs and field modems. Track deployments, monitor health in real time, merge roster intent with incoming telemetry, and control your fleet through a unified database and dashboard.
+
+## Features
+
+- **Progressive Web App (PWA)**: Mobile-first responsive design optimized for field deployment operations
+  - **Install as App**: Add to home screen on iOS/Android for native app experience
+  - **Offline Capable**: Service worker caching with IndexedDB storage for offline operation
+  - **Touch Optimized**: 44x44px minimum touch targets, hamburger menu, bottom navigation bar
+  - **Mobile Card View**: Compact unit cards with status dots, tap-to-navigate locations, and detail modals
+  - **Background Sync**: Queue edits while offline and automatically sync when connection returns
+- **Web Dashboard**: Modern, responsive UI with dark/light mode, live HTMX updates, and integrated fleet map
+- **Fleet Monitoring**: Track deployed, benched, retired, and ignored units in separate buckets with unknown-emitter triage
+- **Roster Management**: Full CRUD + CSV import/export, device-type aware metadata, and inline actions from the roster tables
+- **Settings & Safeguards**: `/settings` page exposes roster stats, exports, replace-all imports, and danger-zone reset tools
+- **Device & Modem Metadata**: Capture calibration windows, modem pairings, phone/IP details, and addresses per unit
+- **Status Management**: Automatically mark deployed units as OK, Pending (>12h), or Missing (>24h) based on recent telemetry
+- **Data Ingestion**: Accept reports from emitter scripts via REST API
+- **Photo Management**: Upload and view photos for each unit
+- **Interactive Maps**: Leaflet-based maps showing unit locations with tap-to-navigate for mobile
+- **SQLite Storage**: Lightweight, file-based database for easy deployment
+- **Database Management**: Comprehensive backup and restore system
+  - **Manual Snapshots**: Create on-demand backups with descriptions
+  - **Restore from Snapshot**: Restore database with automatic safety backups
+  - **Upload/Download**: Transfer database snapshots for off-site storage
+  - **Remote Cloning**: Copy production database to remote dev servers over WAN
+  - **Automatic Backups**: Scheduled background backups with configurable retention
+
+## Roster Manager & Settings
+
+Visit [`/settings`](http://localhost:8001/settings) to perform bulk roster operations with guardrails:
+
+- **CSV export/import**: Download the entire roster, merge updates, or replace all units in one transaction.
+- **Live roster table**: Fetch every unit via HTMX, edit metadata, toggle deployed/retired states, move emitters to the ignore list, or delete records in-place.
+- **Database backups**: Create snapshots, restore from backups, upload/download database files, view database statistics.
+- **Remote cloning**: Clone production database to remote development servers over the network (see `scripts/clone_db_to_dev.py`).
+- **Stats at a glance**: View counts for the roster, emitters, and ignored units to confirm import/cleanup operations worked.
+- **Danger zone controls**: Clear specific tables or wipe all fleet data when resetting a lab/demo environment.
+
+All UI actions call `GET/POST /api/settings/*` endpoints so you can automate the same workflows from scripts. See [docs/DATABASE_MANAGEMENT.md](docs/DATABASE_MANAGEMENT.md) for comprehensive database backup and restore documentation.
+
+## Tech Stack
+
+- **FastAPI**: Modern, fast web framework
+- **SQLAlchemy**: SQL toolkit and ORM
+- **SQLite**: Lightweight database
+- **HTMX**: Dynamic updates without heavy JavaScript frameworks
+- **TailwindCSS**: Utility-first CSS framework
+- **Leaflet**: Interactive maps
+- **Jinja2**: Server-side templating
+- **uvicorn**: ASGI server
+- **Docker**: Containerization for easy deployment
+
+## Quick Start with Docker Compose (Recommended)
+
+### Prerequisites
+- Docker and Docker Compose installed
+
+### Running the Application
+
+1. **Start the service:**
+   ```bash
+   docker compose up -d
+   ```
+
+2. **Check logs:**
+   ```bash
+   docker compose logs -f
+   ```
+
+3. **Stop the service:**
+   ```bash
+   docker compose down
+   ```
+
+The application will be available at:
+- **Web Interface**: http://localhost:8001
+- **API Documentation**: http://localhost:8001/docs
+- **Health Check**: http://localhost:8001/health
+
+### Data Persistence
+
+The SQLite database and photos are stored in the `./data` directory, which is mounted as a volume. Your data will persist even if you restart or rebuild the container.
+
+## Local Development (Without Docker)
+
+### Prerequisites
+- Python 3.11+
+- pip
+
+### Setup
+
+1. **Install dependencies:**
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+2. **Run the server:**
+   ```bash
+   uvicorn backend.main:app --host 0.0.0.0 --port 8001 --reload
+   ```
+
+The application will be available at http://localhost:8001
+
+### Optional: Generate Sample Data
+
+Need realistic data quickly? Run:
+
+```bash
+python create_test_db.py
+cp /tmp/sfm_test.db data/seismo_fleet.db
+```
+
+The helper script creates a modem/seismograph mix so you can exercise the dashboard, roster tabs, and unit detail screens immediately.
+
+## Upgrading from Previous Versions
+
+### From v0.2.x to v0.3.0
+
+Version 0.3.0 introduces user preferences storage. Run the migration once per database file:
+
+```bash
+python backend/migrate_add_user_preferences.py
+```
+
+This creates the `user_preferences` table for persistent settings storage (timezone, theme, auto-refresh interval, calibration defaults, status thresholds).
+
+### From v0.1.x to v0.2.x or later
+
+Versions ≥0.2 introduce new roster columns (device_type, calibration dates, modem metadata, addresses, etc.). Run the migration once per database file:
+
+```bash
+python backend/migrate_add_device_types.py
+```
+
+Both migration scripts are idempotent—if the columns/tables already exist, they simply exit.
+
+## API Endpoints
+
+### Web Pages
+- **GET** `/` - Dashboard home page
+- **GET** `/roster` - Fleet roster page
+- **GET** `/unit/{unit_id}` - Unit detail page
+- **GET** `/settings` - Roster manager, CSV import/export, and danger-zone utilities
+
+### Fleet Status & Monitoring
+- **GET** `/api/status-snapshot` - Complete fleet status snapshot
+- **GET** `/api/roster` - List of all units with metadata
+- **GET** `/api/unit/{unit_id}` - Detailed unit information
+- **GET** `/health` - Health check endpoint
+
+### Roster Management
+- **POST** `/api/roster/add` - Add new unit to roster
+  ```bash
+  curl -X POST http://localhost:8001/api/roster/add \
+    -F "id=BE1234" \
+    -F "device_type=seismograph" \
+    -F "unit_type=series3" \
+    -F "project_id=PROJ-001" \
+    -F "deployed=true" \
+    -F "note=Main site sensor"
+  ```
+- **GET** `/api/roster/{unit_id}` - Fetch a single roster entry for editing
+- **POST** `/api/roster/edit/{unit_id}` - Update all metadata (device type, calibration dates, modem fields, etc.)
+- **POST** `/api/roster/set-deployed/{unit_id}` - Toggle deployment status
+- **POST** `/api/roster/set-retired/{unit_id}` - Toggle retired status
+- **POST** `/api/roster/set-note/{unit_id}` - Update unit notes
+- **DELETE** `/api/roster/{unit_id}` - Remove a roster/emitter pair entirely
+- **POST** `/api/roster/import-csv` - Bulk import from CSV (merge/update mode)
+  ```bash
+  curl -X POST http://localhost:8001/api/roster/import-csv \
+    -F "file=@roster.csv" \
+    -F "update_existing=true"
+  ```
+- **POST** `/api/roster/ignore/{unit_id}` - Move an unknown emitter to the ignore list
+- **DELETE** `/api/roster/ignore/{unit_id}` - Remove a unit from the ignore list
+- **GET** `/api/roster/ignored` - List all ignored units with reasons
+
+### Settings & Data Management
+- **GET** `/api/settings/export-csv` - Download the entire roster as CSV
+- **GET** `/api/settings/stats` - Counts for roster, emitters, and ignored tables
+- **GET** `/api/settings/roster-units` - Raw roster dump for the settings data grid
+- **POST** `/api/settings/import-csv-replace` - Replace the entire roster in one atomic transaction
+- **GET** `/api/settings/preferences` - Get user preferences (timezone, theme, calibration defaults, etc.)
+- **PUT** `/api/settings/preferences` - Update user preferences (supports partial updates)
+- **POST** `/api/settings/clear-all` - Danger-zone action that wipes roster, emitters, and ignored tables
+- **POST** `/api/settings/clear-roster` - Delete only roster entries
+- **POST** `/api/settings/clear-emitters` - Delete auto-discovered emitters
+- **POST** `/api/settings/clear-ignored` - Reset ignore list
+
+### Database Management
+- **GET** `/api/settings/database/stats` - Database size, row counts, and last modified time
+- **POST** `/api/settings/database/snapshot` - Create manual database snapshot with optional description
+- **GET** `/api/settings/database/snapshots` - List all available snapshots with metadata
+- **GET** `/api/settings/database/snapshot/{filename}` - Download a specific snapshot file
+- **DELETE** `/api/settings/database/snapshot/{filename}` - Delete a snapshot
+- **POST** `/api/settings/database/restore` - Restore database from snapshot (creates safety backup)
+- **POST** `/api/settings/database/upload-snapshot` - Upload snapshot file to server
+
+See [docs/DATABASE_MANAGEMENT.md](docs/DATABASE_MANAGEMENT.md) for detailed documentation and examples.
+
+### CSV Import Format
+Create a CSV file with the following columns (only `unit_id` is required, everything else is optional):
+
+```
+unit_id,unit_type,device_type,deployed,retired,note,project_id,location,address,coordinates,last_calibrated,next_calibration_due,deployed_with_modem_id,ip_address,phone_number,hardware_model
+```
+
+Boolean columns accept `true/false`, `1/0`, or `yes/no` (case-insensitive). Date columns expect `YYYY-MM-DD`. Use the same schema whether you merge via `/api/roster/import-csv` or replace everything with `/api/settings/import-csv-replace`.
+
+#### Example
+
+```csv
+unit_id,unit_type,device_type,deployed,retired,note,project_id,location,address,coordinates,last_calibrated,next_calibration_due,deployed_with_modem_id,ip_address,phone_number,hardware_model
+BE1234,series3,seismograph,true,false,Primary sensor,PROJ-001,"Station A","123 Market St, San Francisco, CA","37.7937,-122.3965",2025-01-15,2026-01-15,MDM001,,,
+MDM001,modem,modem,true,false,Field modem,PROJ-001,"Station A","123 Market St, San Francisco, CA","37.7937,-122.3965",,,,"192.0.2.10","+1-555-0100","Raven XTV"
+```
+
+See [sample_roster.csv](sample_roster.csv) for a minimal working example.
+
+### Emitter Reporting
+- **POST** `/emitters/report` - Submit status report from a seismograph unit
+- **POST** `/api/series3/heartbeat` - Series 3 multi-unit telemetry payload
+- **POST** `/api/series4/heartbeat` - Series 4 (Micromate) multi-unit telemetry payload
+- **GET** `/fleet/status` - Retrieve status of all seismograph units (legacy)
+
+### Photo Management
+- **GET** `/api/unit/{unit_id}/photos` - List photos for a unit
+- **GET** `/api/unit/{unit_id}/photo/{filename}` - Serve specific photo file
+
+## API Documentation
+
+Once running, interactive API documentation is available at:
+- **Swagger UI**: http://localhost:8001/docs
+- **ReDoc**: http://localhost:8001/redoc
+
+## Testing the API
+
+### Using curl
+
+**Submit a report:**
+```bash
+curl -X POST http://localhost:8001/emitters/report \
+  -H "Content-Type: application/json" \
+  -d '{
+    "unit": "SEISMO-001",
+    "unit_type": "series3",
+    "timestamp": "2025-11-20T10:30:00",
+    "file": "event_20251120_103000.dat",
+    "status": "OK"
+  }'
+```
+
+**Get fleet status:**
+```bash
+curl http://localhost:8001/api/roster
+```
+
+**Import roster from CSV:**
+```bash
+curl -X POST http://localhost:8001/api/roster/import-csv \
+  -F "file=@sample_roster.csv" \
+  -F "update_existing=true"
+```
+
+### Using Python
+
+```python
+import requests
+from datetime import datetime
+
+# Submit report
+response = requests.post(
+    "http://localhost:8001/emitters/report",
+    json={
+        "unit": "SEISMO-001",
+        "unit_type": "series3",
+        "timestamp": datetime.utcnow().isoformat(),
+        "file": "event_20251120_103000.dat",
+        "status": "OK"
+    }
+)
+print(response.json())
+
+# Get fleet status
+response = requests.get("http://localhost:8001/api/roster")
+print(response.json())
+
+# Import CSV
+with open('roster.csv', 'rb') as f:
+    files = {'file': f}
+    data = {'update_existing': 'true'}
+    response = requests.post(
+        "http://localhost:8001/api/roster/import-csv",
+        files=files,
+        data=data
+    )
+print(response.json())
+```
+
+## Data Model
+
+### RosterUnit Table (Fleet Roster)
+
+**Common fields**
+
+| Field | Type | Description |
+|-------|------|-------------|
+| id | string | Unit identifier (primary key) |
+| unit_type | string | Hardware model name (default: `series3`) |
+| device_type | string | Device type: `"seismograph"`, `"modem"`, or `"slm"` (sound level meter) |
+| deployed | boolean | Whether the unit is in the field |
+| retired | boolean | Removes the unit from deployments but preserves history |
+| note | string | Notes about the unit |
+| project_id | string | Associated project identifier |
+| location | string | Legacy location label |
+| address | string | Human-readable address |
+| coordinates | string | `lat,lon` pair used by the map |
+| last_updated | datetime | Last modification timestamp |
+
+**Seismograph-only fields**
+
+| Field | Type | Description |
+|-------|------|-------------|
+| last_calibrated | date | Last calibration date |
+| next_calibration_due | date | Next calibration date |
+| deployed_with_modem_id | string | Which modem is paired during deployment |
+
+**Modem-only fields**
+
+| Field | Type | Description |
+|-------|------|-------------|
+| ip_address | string | Assigned IP (static or DHCP) |
+| phone_number | string | Cellular number for the modem |
+| hardware_model | string | Modem hardware reference |
+
+**Sound Level Meter (SLM) fields**
+
+| Field | Type | Description |
+|-------|------|-------------|
+| slm_host | string | Direct IP address for SLM (if not using modem) |
+| slm_tcp_port | integer | TCP control port (default: 2255) |
+| slm_ftp_port | integer | FTP file transfer port (default: 21) |
+| slm_model | string | Device model (NL-43, NL-53) |
+| slm_serial_number | string | Manufacturer serial number |
+| slm_frequency_weighting | string | Frequency weighting setting (A, C, Z) |
+| slm_time_weighting | string | Time weighting setting (F=Fast, S=Slow) |
+| slm_measurement_range | string | Measurement range setting |
+| slm_last_check | datetime | Last status check timestamp |
+| deployed_with_modem_id | string | Modem pairing (shared with seismographs) |
+
+### Device Type Schema
+
+Terra-View supports three device types with the following standardized `device_type` values:
+
+- **`"seismograph"`** (default) - Seismic monitoring devices (Series 3, Series 4, Micromate)
+  - Uses: calibration dates, modem pairing
+  - Examples: BE1234, UM12345 (Series 3/4 units)
+
+- **`"modem"`** - Field modems and network equipment
+  - Uses: IP address, phone number, hardware model
+  - Examples: MDM001, MODEM-2025-01
+
+- **`"slm"`** - Sound level meters (Rion NL-43/NL-53)
+  - Uses: TCP/FTP configuration, measurement settings, modem pairing
+  - Examples: SLM-43-01, NL43-001
+
+**Important**: All `device_type` values must be lowercase. The legacy value `"sound_level_meter"` has been deprecated in favor of the shorter `"slm"`. Run `backend/migrate_standardize_device_types.py` to update existing databases.
+
+### Emitter Table (Device Check-ins)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| id | string | Unit identifier (primary key) |
+| unit_type | string | Reported device type/model |
+| last_seen | datetime | Last report timestamp |
+| last_file | string | Last file processed |
+| status | string | Current status: OK, Pending, Missing |
+| notes | string | Optional notes (nullable) |
+
+### IgnoredUnit Table (Noise Management)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| id | string | Unit identifier (primary key) |
+| reason | string | Optional context for ignoring |
+| ignored_at | datetime | When the ignore action occurred |
+
+### UserPreferences Table (Settings Storage)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| id | integer | Always 1 (single-row table) |
+| timezone | string | Display timezone (default: America/New_York) |
+| theme | string | UI theme: auto, light, or dark |
+| auto_refresh_interval | integer | Dashboard refresh interval in seconds |
+| date_format | string | Date format preference |
+| table_rows_per_page | integer | Default pagination size |
+| calibration_interval_days | integer | Default days between calibrations |
+| calibration_warning_days | integer | Warning threshold before calibration due |
+| status_ok_threshold_hours | integer | Hours for OK status threshold |
+| status_pending_threshold_hours | integer | Hours for Pending status threshold |
+| updated_at | datetime | Last preference update timestamp |
+
+## Project Structure
+
+```
+seismo-fleet-manager/
+├── backend/
+│   ├── main.py              # FastAPI app entry point
+│   ├── database.py          # SQLAlchemy database configuration
+│   ├── models.py            # Database models (RosterUnit, Emitter, IgnoredUnit, UserPreferences)
+│   ├── routes.py            # Legacy API endpoints + Series 3/4 heartbeat endpoints
+│   ├── routers/             # Modular API routers
+│   │   ├── roster.py        # Fleet status endpoints
+│   │   ├── roster_edit.py   # Roster management & CSV import
+│   │   ├── units.py         # Unit detail endpoints
+│   │   ├── photos.py        # Photo management
+│   │   ├── dashboard.py     # Dashboard partials
+│   │   ├── dashboard_tabs.py # Dashboard tab endpoints
+│   │   └── settings.py      # Settings, preferences, and data management
+│   ├── services/
+│   │   ├── snapshot.py      # Fleet status snapshot logic
+│   │   ├── database_backup.py # Database backup and restore service
+│   │   └── backup_scheduler.py # Automatic backup scheduler
+│   ├── migrate_add_device_types.py # SQLite migration for v0.2 schema
+│   ├── migrate_add_user_preferences.py # SQLite migration for v0.3 schema
+│   └── static/              # Static assets (CSS, etc.)
+├── create_test_db.py        # Generate a sample SQLite DB with mixed devices
+├── templates/               # Jinja2 HTML templates
+│   ├── base.html            # Base layout with sidebar
+│   ├── dashboard.html       # Main dashboard
+│   ├── roster.html          # Fleet roster table
+│   ├── unit_detail.html     # Unit detail page
+│   ├── settings.html        # Roster manager UI
+│   └── partials/            # HTMX partial templates
+│       ├── roster_table.html
+│       ├── retired_table.html
+│       ├── ignored_table.html
+│       └── unknown_emitters.html
+├── data/                    # SQLite database & photos (persisted)
+│   └── backups/             # Database snapshots directory
+├── scripts/
+│   └── clone_db_to_dev.py   # Remote database cloning utility
+├── docs/
+│   └── DATABASE_MANAGEMENT.md # Database backup/restore guide
+├── requirements.txt         # Python dependencies
+├── Dockerfile               # Docker container definition
+├── docker-compose.yml       # Docker Compose configuration
+├── CHANGELOG.md             # Version history
+├── FRONTEND_README.md       # Frontend documentation
+└── README.md                # This file
+```
+
+## Docker Commands
+
+**Build the image:**
+```bash
+docker compose build
+```
+
+**Start in foreground:**
+```bash
+docker compose up
+```
+
+**Start in background:**
+```bash
+docker compose up -d
+```
+
+**View logs:**
+```bash
+docker compose logs -f seismo-backend
+```
+
+**Restart service:**
+```bash
+docker compose restart
+```
+
+**Rebuild and restart:**
+```bash
+docker compose up -d --build
+```
+
+**Stop and remove containers:**
+```bash
+docker compose down
+```
+
+**Remove containers and volumes:**
+```bash
+docker compose down -v
+```
+
+## Release Highlights
+
+### v0.8.0 — 2026-03-18
+- **Watcher Manager**: Admin page for monitoring field watcher agents with live status cards, log tails, and one-click update triggering
+- **Watcher Status Fix**: Agent status now reflects heartbeat connectivity (missing if not heard from in >60 min) rather than unit-level data staleness
+- **Live Refresh**: Watcher Manager surgically patches status, last-seen, and pending indicators every 30s without a full page reload
+
+### v0.7.0 — 2026-03-07
+- **Project Status Management**: On-hold and archived project states with automatic cancellation of pending actions
+- **Manual SD Card Upload**: Upload offline NRL/SLM data directly from SD card (ZIP or multi-file); auto-creates monitoring sessions from `.rnh` metadata
+- **Combined Report Wizard**: Multi-session Excel report generation with location grouping, period type filtering, and ZIP download
+- **NL32 Support**: Report generator and web viewer now handle NL32 measurement data
+- **Chart Preview**: Live chart preview in the report generator matching final output styling
+- **Standalone SLM Mode**: SLMs can now be configured without a paired modem (direct IP)
+- **Vibration Project Isolation**: Vibration project views no longer show SLM-specific tabs
+- **MonitoringSession Rename**: `RecordingSession` renamed to `MonitoringSession` throughout; run migration before deploying
+
+### v0.6.1 — 2026-02-16
+- **One-Off Recording Schedules**: Schedule single recordings with specific start/end datetimes
+- **Bidirectional Pairing Sync**: Device-modem pairing now updates both sides automatically
+- **Scheduler Timezone Fix**: One-off schedule times use local time instead of UTC
+
+### v0.6.0 — 2026-02-06
+- **Calendar & Reservation Mode**: Fleet calendar view with device deployment scheduling and reservation system
+- **Device Pairing Interface**: New `/pair-devices` page with two-column layout for linking recorders with modems, fuzzy-search, and visual pairing workflow
+- **Calibration UX Overhaul**: Users now set date of previous calibration (not expiry); seismograph list enhanced with color-coded calibration status, filtering, and sorting
+- **Modem Dashboard**: Model number as dedicated config, modem login links, list view format, and pairing options accessible from modem page
+- **SLMM Improvements**: Device control lock prevents command flooding, fixed polling intervals and scheduled downloads
+- **UI Polish**: Tab state persists in URL hash, settings save without reload, scheduler changes cascade to events, fixed mobile type display
+
+### v0.4.3 — 2026-01-14
+- **Sound Level Meter workflow**: Roster manager surfaces SLM metadata, supports rename actions, and adds return-to-project navigation plus schedule/unit templates for project planning.
+- **Project insight panels**: Project dashboards now expose file and session lists so teams can see what each project stores before diving into units.
+- **Project view polish**: FTP browser supports folder downloads, the timer display was reimplemented, and the project/device templates gained edit modals for projects and locations to streamline navigation.
+- **SLM sync & accuracy**: Configuration edits now propagate to SLMM (which caches configs for faster responses) and the live view uses the correct DRD fields so telemetry aligns with the control center.
+
+### v0.4.0 — 2025-12-16
+- **Database Management System**: Complete backup and restore functionality with manual snapshots, restore operations, and upload/download capabilities
+- **Remote Database Cloning**: New `clone_db_to_dev.py` script for copying production database to remote dev servers over WAN
+- **Automatic Backup Scheduler**: Background service for scheduled backups with configurable retention management
+- **Database Tab**: New dedicated tab in Settings for all database operations with real-time statistics
+- **Settings Reorganization**: Improved tab structure - renamed "Data Management" to "Roster Management", moved CSV Replace Mode, created Database tab
+- **Comprehensive Documentation**: New `docs/DATABASE_MANAGEMENT.md` with complete guide to backup/restore workflows, API reference, and best practices
+
+### v0.3.3 — 2025-12-12
+- **Improved Mobile Navigation**: Hamburger menu moved to bottom nav bar (no more floating button covering content)
+- **Better Status Visibility**: Larger status dots (16px) in dashboard fleet overview for easier at-a-glance status checks
+- **Cleaner Roster Cards**: Location navigation links moved to detail modal only, reducing clutter in card view
+
+### v0.3.2 — 2025-12-12
+- **Progressive Web App (PWA)**: Complete mobile optimization with offline support, installable as standalone app
+- **Mobile-First UI**: Hamburger menu, bottom navigation bar, card-based roster view optimized for touch
+- **Tap-to-Navigate**: Location links open in user's preferred navigation app (Google Maps, Apple Maps, Waze)
+- **Offline Editing**: Service worker + IndexedDB for offline operation with automatic sync when online
+- **Unit Detail Modals**: Bottom sheet modals for quick unit info access with full edit capabilities
+- **Hard Reload Utility**: "Clear Cache & Reload" button to force fresh assets (helpful for development)
+
+### v0.3.1 — 2025-12-12
+- **Dashboard Alerts**: Only Missing units show in notifications (Pending units no longer alert)
+- **Status Fixes**: Fixed "Unknown" status issues in mobile card views and detail modals
+- **Backend Improvements**: Safer data access with `.get()` defaults to prevent errors
+
+### v0.3.0 — 2025-12-09
+- **Series 4 Support**: New `/api/series4/heartbeat` endpoint with auto-detection for Micromate units (UM##### pattern)
+- **Settings Redesign**: Completely redesigned Settings page with 4-tab interface (General, Data Management, Advanced, Danger Zone)
+- **User Preferences**: Backend storage for timezone, theme, auto-refresh interval, calibration defaults, and status thresholds
+- **Development Labels**: Visual indicators to distinguish dev from production environments
+- **Timezone Support**: Comprehensive timezone handling with human-readable timestamps site-wide
+- **Quality of Life**: Relative timestamps, status icons for accessibility, breadcrumb navigation, copy-to-clipboard, search functionality
+
+### v0.2.1 — 2025-12-03
+- Added the `/settings` roster manager with CSV export/import, live stats, and danger-zone table reset actions
+- Deployed/Benched/Retired/Ignored tabs now have dedicated HTMX partials, sorting, and inline actions
+- Unit detail pages expose device-type specific metadata (calibration windows, modem pairing, IP/phone fields)
+- Snapshot summary and dashboard counts now focus on deployed units and include address/coordinate data
+
+### v0.2.0 — 2025-12-03
+- Introduced device-type aware roster schema (seismograph vs modem) plus migration + `create_test_db.py` helper
+- Added Ignore list model/endpoints to quarantine noisy emitters directly from the roster
+- Roster page gained Add Unit + CSV Import modals, HTMX-driven updates, and unknown emitter callouts
+- Snapshot service now returns active/benched/retired/unknown buckets containing richer metadata
+
+### v0.1.1 — 2025-12-02
+- **Roster Editing API**: Full CRUD operations for managing your fleet roster
+- **CSV Import**: Bulk upload roster data from CSV files
+- **Enhanced Data Model**: Added project_id and location fields to roster
+- **Bug Fixes**: Improved database session management and error handling
+
+See [CHANGELOG.md](CHANGELOG.md) for the full release notes.
+
+## Future Enhancements
+
+- Email/SMS alerts for missing units
+- Historical data tracking and reporting
+- Multi-user authentication
+- PostgreSQL support for larger deployments
+- Advanced filtering and search
+- Export roster to various formats
+
+## License
+
+MIT
+
+## Version
+
+**Current: 0.8.0** — Watcher Manager admin page, live agent status refresh, watcher connectivity-based status (2026-03-18)
+
+Previous: 0.7.1 — Out-for-calibration status, reservation modal, migration fixes (2026-03-12)
+
+0.7.0 — Project status management, manual SD card upload, combined report wizard, NL32 support, MonitoringSession rename (2026-03-07)
+
+0.6.1 — One-off recording schedules, bidirectional pairing sync, scheduler timezone fix (2026-02-16)
+
+0.6.0 — Calendar & reservation mode, device pairing interface, calibration UX overhaul, modem dashboard enhancements (2026-02-06)
+
+0.5.1 — Dashboard schedule view with today's actions panel, new Terra-View branding and logo rework (2026-01-27)
+
+0.4.4 — Recurring schedules, alerting UI, report templates + RND viewer, and SLM workflow polish (2026-01-23)
+
+0.4.3 — SLM roster/project view refresh, project insight panels, FTP browser folder downloads, and SLMM sync (2026-01-14)
+
+0.4.2 — SLM configuration interface with TCP/FTP controls, modem diagnostics, and dashboard endpoints for Sound Level Meters (2026-01-05)
+
+0.4.1 — Sound Level Meter integration with full management UI for SLM units (2026-01-05)
+
+0.4.0 — Database management system with backup/restore and remote cloning (2025-12-16)
+
+0.3.3 — Mobile navigation improvements and better status visibility (2025-12-12)
+
+0.3.2 — Progressive Web App with mobile optimization (2025-12-12)
+
+0.3.1 — Dashboard alerts and status fixes (2025-12-12)
+
+0.3.0 — Series 4 support, settings redesign, user preferences (2025-12-09)
+
+0.2.1 — Settings & roster manager refresh (2025-12-03)
+
+0.2.0 — Device-type aware roster + ignore list (2025-12-03)
+
+0.1.1 — Roster Management & CSV Import (2025-12-02)
+
+0.1.0 — Initial Release (2024-11-20)

backend/database.py

@@ -0,0 +1,31 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+import os
+
+# Ensure data directory exists
+os.makedirs("data", exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./data/seismo_fleet.db"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+def get_db():
+    """Dependency for database sessions"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def get_db_session():
+    """Get a database session directly (not as a dependency)"""
+    return SessionLocal()

backend/init_projects_db.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+"""
+Database initialization script for Projects system.
+
+This script creates the new project management tables and populates
+the project_types table with default templates.
+
+Usage:
+    python -m backend.init_projects_db
+"""
+
+from sqlalchemy.orm import Session
+from backend.database import engine, SessionLocal
+from backend.models import (
+    Base,
+    ProjectType,
+    Project,
+    MonitoringLocation,
+    UnitAssignment,
+    ScheduledAction,
+    MonitoringSession,
+    DataFile,
+)
+from datetime import datetime
+
+
+def init_project_types(db: Session):
+    """Initialize default project types."""
+    project_types = [
+        {
+            "id": "sound_monitoring",
+            "name": "Sound Monitoring",
+            "description": "Noise monitoring projects with sound level meters and NRLs (Noise Recording Locations)",
+            "icon": "volume-2",  # Lucide icon name
+            "supports_sound": True,
+            "supports_vibration": False,
+        },
+        {
+            "id": "vibration_monitoring",
+            "name": "Vibration Monitoring",
+            "description": "Seismic/vibration monitoring projects with seismographs and monitoring points",
+            "icon": "activity",  # Lucide icon name
+            "supports_sound": False,
+            "supports_vibration": True,
+        },
+        {
+            "id": "combined",
+            "name": "Combined Monitoring",
+            "description": "Full-spectrum monitoring with both sound and vibration capabilities",
+            "icon": "layers",  # Lucide icon name
+            "supports_sound": True,
+            "supports_vibration": True,
+        },
+    ]
+
+    for pt_data in project_types:
+        existing = db.query(ProjectType).filter_by(id=pt_data["id"]).first()
+        if not existing:
+            pt = ProjectType(**pt_data)
+            db.add(pt)
+            print(f"✓ Created project type: {pt_data['name']}")
+        else:
+            print(f"  Project type already exists: {pt_data['name']}")
+
+    db.commit()
+
+
+def create_tables():
+    """Create all tables defined in models."""
+    print("Creating project management tables...")
+    Base.metadata.create_all(bind=engine)
+    print("✓ Tables created successfully")
+
+
+def main():
+    print("=" * 60)
+    print("Terra-View Projects System - Database Initialization")
+    print("=" * 60)
+    print()
+
+    # Create tables
+    create_tables()
+    print()
+
+    # Initialize project types
+    db = SessionLocal()
+    try:
+        print("Initializing project types...")
+        init_project_types(db)
+        print()
+        print("=" * 60)
+        print("✓ Database initialization complete!")
+        print("=" * 60)
+        print()
+        print("Next steps:")
+        print("  1. Restart Terra-View to load new routes")
+        print("  2. Navigate to /projects to create your first project")
+        print("  3. Check documentation for API endpoints")
+    except Exception as e:
+        print(f"✗ Error during initialization: {e}")
+        db.rollback()
+        raise
+    finally:
+        db.close()
+
+
+if __name__ == "__main__":
+    main()

backend/main.py

@@ -0,0 +1,854 @@
+import os
+import logging
+from fastapi import FastAPI, Request, Depends, HTTPException
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
+from fastapi.templating import Jinja2Templates
+from fastapi.responses import HTMLResponse, FileResponse, JSONResponse
+from fastapi.exceptions import RequestValidationError
+from sqlalchemy.orm import Session
+from typing import List, Dict, Optional
+from pydantic import BaseModel
+
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
+)
+logger = logging.getLogger(__name__)
+
+from backend.database import engine, Base, get_db
+from backend.routers import roster, units, photos, roster_edit, roster_rename, dashboard, dashboard_tabs, activity, slmm, slm_ui, slm_dashboard, seismo_dashboard, projects, project_locations, scheduler, modem_dashboard
+from backend.services.snapshot import emit_status_snapshot
+from backend.models import IgnoredUnit
+from backend.utils.timezone import get_user_timezone
+
+# Create database tables
+Base.metadata.create_all(bind=engine)
+
+# Read environment (development or production)
+ENVIRONMENT = os.getenv("ENVIRONMENT", "production")
+
+# Initialize FastAPI app
+VERSION = "0.9.3"
+if ENVIRONMENT == "development":
+    _build = os.getenv("BUILD_NUMBER", "0")
+    if _build and _build != "0":
+        VERSION = f"{VERSION}-{_build}"
+app = FastAPI(
+    title="Seismo Fleet Manager",
+    description="Backend API for managing seismograph fleet status",
+    version=VERSION
+)
+
+# Add validation error handler to log details
+@app.exception_handler(RequestValidationError)
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+    logger.error(f"Validation error on {request.url}: {exc.errors()}")
+    logger.error(f"Body: {await request.body()}")
+    return JSONResponse(
+        status_code=400,
+        content={"detail": exc.errors()}
+    )
+
+# Configure CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Mount static files
+app.mount("/static", StaticFiles(directory="backend/static"), name="static")
+
+# Use shared templates configuration with timezone filters
+from backend.templates_config import templates
+
+# Add custom context processor to inject environment variable into all templates
+@app.middleware("http")
+async def add_environment_to_context(request: Request, call_next):
+    """Middleware to add environment variable to request state"""
+    request.state.environment = ENVIRONMENT
+    response = await call_next(request)
+    return response
+
+# Override TemplateResponse to include environment and version in context
+original_template_response = templates.TemplateResponse
+def custom_template_response(name, context=None, *args, **kwargs):
+    if context is None:
+        context = {}
+    context["environment"] = ENVIRONMENT
+    context["version"] = VERSION
+    return original_template_response(name, context, *args, **kwargs)
+templates.TemplateResponse = custom_template_response
+
+# Include API routers
+app.include_router(roster.router)
+app.include_router(units.router)
+app.include_router(photos.router)
+app.include_router(roster_edit.router)
+app.include_router(roster_rename.router)
+app.include_router(dashboard.router)
+app.include_router(dashboard_tabs.router)
+app.include_router(activity.router)
+app.include_router(slmm.router)
+app.include_router(slm_ui.router)
+app.include_router(slm_dashboard.router)
+app.include_router(seismo_dashboard.router)
+app.include_router(modem_dashboard.router)
+
+from backend.routers import settings
+app.include_router(settings.router)
+
+from backend.routers import watcher_manager
+app.include_router(watcher_manager.router)
+
+# Projects system routers
+app.include_router(projects.router)
+app.include_router(project_locations.router)
+app.include_router(scheduler.router)
+
+# Report templates router
+from backend.routers import report_templates
+app.include_router(report_templates.router)
+
+# Alerts router
+from backend.routers import alerts
+app.include_router(alerts.router)
+
+# Recurring schedules router
+from backend.routers import recurring_schedules
+app.include_router(recurring_schedules.router)
+
+# Fleet Calendar router
+from backend.routers import fleet_calendar
+app.include_router(fleet_calendar.router)
+
+# Deployment Records router
+from backend.routers import deployments
+app.include_router(deployments.router)
+
+# Start scheduler service and device status monitor on application startup
+from backend.services.scheduler import start_scheduler, stop_scheduler
+from backend.services.device_status_monitor import start_device_status_monitor, stop_device_status_monitor
+
+@app.on_event("startup")
+async def startup_event():
+    """Initialize services on app startup"""
+    logger.info("Starting scheduler service...")
+    await start_scheduler()
+    logger.info("Scheduler service started")
+
+    logger.info("Starting device status monitor...")
+    await start_device_status_monitor()
+    logger.info("Device status monitor started")
+
+@app.on_event("shutdown")
+def shutdown_event():
+    """Clean up services on app shutdown"""
+    logger.info("Stopping device status monitor...")
+    stop_device_status_monitor()
+    logger.info("Device status monitor stopped")
+
+    logger.info("Stopping scheduler service...")
+    stop_scheduler()
+    logger.info("Scheduler service stopped")
+
+
+# Legacy routes from the original backend
+from backend import routes as legacy_routes
+app.include_router(legacy_routes.router)
+
+
+# HTML page routes
+@app.get("/", response_class=HTMLResponse)
+async def dashboard(request: Request):
+    """Dashboard home page"""
+    return templates.TemplateResponse("dashboard.html", {"request": request})
+
+
+@app.get("/roster", response_class=HTMLResponse)
+async def roster_page(request: Request):
+    """Fleet roster page"""
+    return templates.TemplateResponse("roster.html", {"request": request})
+
+
+@app.get("/unit/{unit_id}", response_class=HTMLResponse)
+async def unit_detail_page(request: Request, unit_id: str):
+    """Unit detail page"""
+    return templates.TemplateResponse("unit_detail.html", {
+        "request": request,
+        "unit_id": unit_id
+    })
+
+
+@app.get("/settings", response_class=HTMLResponse)
+async def settings_page(request: Request):
+    """Settings page for roster management"""
+    return templates.TemplateResponse("settings.html", {"request": request})
+
+
+@app.get("/sound-level-meters", response_class=HTMLResponse)
+async def sound_level_meters_page(request: Request):
+    """Sound Level Meters management dashboard"""
+    return templates.TemplateResponse("sound_level_meters.html", {"request": request})
+
+
+@app.get("/slm/{unit_id}", response_class=HTMLResponse)
+async def slm_legacy_dashboard(
+    request: Request,
+    unit_id: str,
+    from_project: Optional[str] = None,
+    from_nrl: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    """Legacy SLM control center dashboard for a specific unit"""
+    # Get project details if from_project is provided
+    project = None
+    if from_project:
+        from backend.models import Project
+        project = db.query(Project).filter_by(id=from_project).first()
+
+    # Get NRL location details if from_nrl is provided
+    nrl_location = None
+    if from_nrl:
+        from backend.models import NRLLocation
+        nrl_location = db.query(NRLLocation).filter_by(id=from_nrl).first()
+
+    return templates.TemplateResponse("slm_legacy_dashboard.html", {
+        "request": request,
+        "unit_id": unit_id,
+        "from_project": from_project,
+        "from_nrl": from_nrl,
+        "project": project,
+        "nrl_location": nrl_location
+    })
+
+
+@app.get("/seismographs", response_class=HTMLResponse)
+async def seismographs_page(request: Request):
+    """Seismographs management dashboard"""
+    return templates.TemplateResponse("seismographs.html", {"request": request})
+
+
+@app.get("/modems", response_class=HTMLResponse)
+async def modems_page(request: Request):
+    """Field modems management dashboard"""
+    return templates.TemplateResponse("modems.html", {"request": request})
+
+
+@app.get("/pair-devices", response_class=HTMLResponse)
+async def pair_devices_page(request: Request, db: Session = Depends(get_db)):
+    """
+    Device pairing page - two-column layout for pairing recorders with modems.
+    """
+    from backend.models import RosterUnit
+
+    # Get all non-retired recorders (seismographs and SLMs)
+    recorders = db.query(RosterUnit).filter(
+        RosterUnit.retired == False,
+        RosterUnit.device_type.in_(["seismograph", "slm", None])  # None defaults to seismograph
+    ).order_by(RosterUnit.id).all()
+
+    # Get all non-retired modems
+    modems = db.query(RosterUnit).filter(
+        RosterUnit.retired == False,
+        RosterUnit.device_type == "modem"
+    ).order_by(RosterUnit.id).all()
+
+    # Build existing pairings list
+    pairings = []
+    for recorder in recorders:
+        if recorder.deployed_with_modem_id:
+            modem = next((m for m in modems if m.id == recorder.deployed_with_modem_id), None)
+            pairings.append({
+                "recorder_id": recorder.id,
+                "recorder_type": (recorder.device_type or "seismograph").upper(),
+                "modem_id": recorder.deployed_with_modem_id,
+                "modem_ip": modem.ip_address if modem else None
+            })
+
+    # Convert to dicts for template
+    recorders_data = [
+        {
+            "id": r.id,
+            "device_type": r.device_type or "seismograph",
+            "deployed": r.deployed,
+            "deployed_with_modem_id": r.deployed_with_modem_id
+        }
+        for r in recorders
+    ]
+
+    modems_data = [
+        {
+            "id": m.id,
+            "deployed": m.deployed,
+            "deployed_with_unit_id": m.deployed_with_unit_id,
+            "ip_address": m.ip_address,
+            "phone_number": m.phone_number
+        }
+        for m in modems
+    ]
+
+    return templates.TemplateResponse("pair_devices.html", {
+        "request": request,
+        "recorders": recorders_data,
+        "modems": modems_data,
+        "pairings": pairings
+    })
+
+
+@app.get("/projects", response_class=HTMLResponse)
+async def projects_page(request: Request):
+    """Projects management and overview"""
+    return templates.TemplateResponse("projects/overview.html", {"request": request})
+
+
+@app.get("/projects/{project_id}", response_class=HTMLResponse)
+async def project_detail_page(request: Request, project_id: str):
+    """Project detail dashboard"""
+    return templates.TemplateResponse("projects/detail.html", {
+        "request": request,
+        "project_id": project_id
+    })
+
+
+@app.get("/projects/{project_id}/nrl/{location_id}", response_class=HTMLResponse)
+async def nrl_detail_page(
+    request: Request,
+    project_id: str,
+    location_id: str,
+    db: Session = Depends(get_db)
+):
+    """NRL (Noise Recording Location) detail page with tabs"""
+    from backend.models import Project, MonitoringLocation, UnitAssignment, RosterUnit, MonitoringSession, DataFile
+    from sqlalchemy import and_
+
+    # Get project
+    project = db.query(Project).filter_by(id=project_id).first()
+    if not project:
+        return templates.TemplateResponse("404.html", {
+            "request": request,
+            "message": "Project not found"
+        }, status_code=404)
+
+    # Get location
+    location = db.query(MonitoringLocation).filter_by(
+        id=location_id,
+        project_id=project_id
+    ).first()
+
+    if not location:
+        return templates.TemplateResponse("404.html", {
+            "request": request,
+            "message": "Location not found"
+        }, status_code=404)
+
+    # Get active assignment
+    assignment = db.query(UnitAssignment).filter(
+        and_(
+            UnitAssignment.location_id == location_id,
+            UnitAssignment.status == "active"
+        )
+    ).first()
+
+    assigned_unit = None
+    assigned_modem = None
+    if assignment:
+        assigned_unit = db.query(RosterUnit).filter_by(id=assignment.unit_id).first()
+        if assigned_unit and assigned_unit.deployed_with_modem_id:
+            assigned_modem = db.query(RosterUnit).filter_by(id=assigned_unit.deployed_with_modem_id).first()
+
+    # Get session count
+    session_count = db.query(MonitoringSession).filter_by(location_id=location_id).count()
+
+    # Get file count (DataFile links to session, not directly to location)
+    file_count = db.query(DataFile).join(
+        MonitoringSession,
+        DataFile.session_id == MonitoringSession.id
+    ).filter(MonitoringSession.location_id == location_id).count()
+
+    # Check for active session
+    active_session = db.query(MonitoringSession).filter(
+        and_(
+            MonitoringSession.location_id == location_id,
+            MonitoringSession.status == "recording"
+        )
+    ).first()
+
+    # Parse connection_mode from location_metadata JSON
+    import json as _json
+    connection_mode = "connected"
+    try:
+        meta = _json.loads(location.location_metadata or "{}")
+        connection_mode = meta.get("connection_mode", "connected")
+    except Exception:
+        pass
+
+    template = "vibration_location_detail.html" if location.location_type == "vibration" else "nrl_detail.html"
+    return templates.TemplateResponse(template, {
+        "request": request,
+        "project_id": project_id,
+        "location_id": location_id,
+        "project": project,
+        "location": location,
+        "assignment": assignment,
+        "assigned_unit": assigned_unit,
+        "assigned_modem": assigned_modem,
+        "session_count": session_count,
+        "file_count": file_count,
+        "active_session": active_session,
+        "connection_mode": connection_mode,
+    })
+
+
+# ===== PWA ROUTES =====
+
+@app.get("/sw.js")
+async def service_worker():
+    """Serve service worker with proper headers for PWA"""
+    return FileResponse(
+        "backend/static/sw.js",
+        media_type="application/javascript",
+        headers={
+            "Service-Worker-Allowed": "/",
+            "Cache-Control": "no-cache"
+        }
+    )
+
+
+@app.get("/offline-db.js")
+async def offline_db_script():
+    """Serve offline database script"""
+    return FileResponse(
+        "backend/static/offline-db.js",
+        media_type="application/javascript",
+        headers={"Cache-Control": "no-cache"}
+    )
+
+
+# Pydantic model for sync edits
+class EditItem(BaseModel):
+    id: int
+    unitId: str
+    changes: Dict
+    timestamp: int
+
+
+class SyncEditsRequest(BaseModel):
+    edits: List[EditItem]
+
+
+@app.post("/api/sync-edits")
+async def sync_edits(request: SyncEditsRequest, db: Session = Depends(get_db)):
+    """Process offline edit queue and sync to database"""
+    from backend.models import RosterUnit
+
+    results = []
+    synced_ids = []
+
+    for edit in request.edits:
+        try:
+            # Find the unit
+            unit = db.query(RosterUnit).filter_by(id=edit.unitId).first()
+
+            if not unit:
+                results.append({
+                    "id": edit.id,
+                    "status": "error",
+                    "reason": f"Unit {edit.unitId} not found"
+                })
+                continue
+
+            # Apply changes
+            for key, value in edit.changes.items():
+                if hasattr(unit, key):
+                    # Handle boolean conversions
+                    if key in ['deployed', 'retired']:
+                        setattr(unit, key, value in ['true', True, 'True', '1', 1])
+                    else:
+                        setattr(unit, key, value if value != '' else None)
+
+            db.commit()
+
+            results.append({
+                "id": edit.id,
+                "status": "success"
+            })
+            synced_ids.append(edit.id)
+
+        except Exception as e:
+            db.rollback()
+            results.append({
+                "id": edit.id,
+                "status": "error",
+                "reason": str(e)
+            })
+
+    synced_count = len(synced_ids)
+
+    return JSONResponse({
+        "synced": synced_count,
+        "total": len(request.edits),
+        "synced_ids": synced_ids,
+        "results": results
+    })
+
+
+@app.get("/partials/roster-deployed", response_class=HTMLResponse)
+async def roster_deployed_partial(request: Request):
+    """Partial template for deployed units tab"""
+    from datetime import datetime
+    snapshot = emit_status_snapshot()
+
+    units_list = []
+    for unit_id, unit_data in snapshot["active"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": unit_data.get("status", "Unknown"),
+            "age": unit_data.get("age", "N/A"),
+            "last_seen": unit_data.get("last", "Never"),
+            "deployed": unit_data.get("deployed", False),
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "address": unit_data.get("address", ""),
+            "coordinates": unit_data.get("coordinates", ""),
+            "project_id": unit_data.get("project_id", ""),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Sort by status priority (Missing > Pending > OK) then by ID
+    status_priority = {"Missing": 0, "Pending": 1, "OK": 2}
+    units_list.sort(key=lambda x: (status_priority.get(x["status"], 3), x["id"]))
+
+    return templates.TemplateResponse("partials/roster_table.html", {
+        "request": request,
+        "units": units_list,
+        "timestamp": datetime.now().strftime("%H:%M:%S")
+    })
+
+
+@app.get("/partials/roster-benched", response_class=HTMLResponse)
+async def roster_benched_partial(request: Request):
+    """Partial template for benched units tab"""
+    from datetime import datetime
+    snapshot = emit_status_snapshot()
+
+    units_list = []
+    for unit_id, unit_data in snapshot["benched"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": unit_data.get("status", "N/A"),
+            "age": unit_data.get("age", "N/A"),
+            "last_seen": unit_data.get("last", "Never"),
+            "deployed": unit_data.get("deployed", False),
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "address": unit_data.get("address", ""),
+            "coordinates": unit_data.get("coordinates", ""),
+            "project_id": unit_data.get("project_id", ""),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Sort by ID
+    units_list.sort(key=lambda x: x["id"])
+
+    return templates.TemplateResponse("partials/roster_table.html", {
+        "request": request,
+        "units": units_list,
+        "timestamp": datetime.now().strftime("%H:%M:%S")
+    })
+
+
+@app.get("/partials/roster-retired", response_class=HTMLResponse)
+async def roster_retired_partial(request: Request):
+    """Partial template for retired units tab"""
+    from datetime import datetime
+    snapshot = emit_status_snapshot()
+
+    units_list = []
+    for unit_id, unit_data in snapshot["retired"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": unit_data["status"],
+            "age": unit_data["age"],
+            "last_seen": unit_data["last"],
+            "deployed": unit_data["deployed"],
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Sort by ID
+    units_list.sort(key=lambda x: x["id"])
+
+    return templates.TemplateResponse("partials/retired_table.html", {
+        "request": request,
+        "units": units_list,
+        "timestamp": datetime.now().strftime("%H:%M:%S")
+    })
+
+
+@app.get("/partials/roster-ignored", response_class=HTMLResponse)
+async def roster_ignored_partial(request: Request, db: Session = Depends(get_db)):
+    """Partial template for ignored units tab"""
+    from datetime import datetime
+
+    ignored = db.query(IgnoredUnit).all()
+    ignored_list = []
+    for unit in ignored:
+        ignored_list.append({
+            "id": unit.id,
+            "reason": unit.reason or "",
+            "ignored_at": unit.ignored_at.strftime("%Y-%m-%d %H:%M:%S") if unit.ignored_at else "Unknown"
+        })
+
+    # Sort by ID
+    ignored_list.sort(key=lambda x: x["id"])
+
+    return templates.TemplateResponse("partials/ignored_table.html", {
+        "request": request,
+        "ignored_units": ignored_list,
+        "timestamp": datetime.now().strftime("%H:%M:%S")
+    })
+
+
+@app.get("/partials/unknown-emitters", response_class=HTMLResponse)
+async def unknown_emitters_partial(request: Request):
+    """Partial template for unknown emitters (HTMX)"""
+    snapshot = emit_status_snapshot()
+
+    unknown_list = []
+    for unit_id, unit_data in snapshot.get("unknown", {}).items():
+        unknown_list.append({
+            "id": unit_id,
+            "status": unit_data["status"],
+            "age": unit_data["age"],
+            "fname": unit_data.get("fname", ""),
+        })
+
+    # Sort by ID
+    unknown_list.sort(key=lambda x: x["id"])
+
+    return templates.TemplateResponse("partials/unknown_emitters.html", {
+        "request": request,
+        "unknown_units": unknown_list
+    })
+
+
+@app.get("/partials/devices-all", response_class=HTMLResponse)
+async def devices_all_partial(request: Request):
+    """Unified partial template for ALL devices with comprehensive filtering support"""
+    from datetime import datetime
+    snapshot = emit_status_snapshot()
+
+    units_list = []
+
+    # Add deployed/active units
+    for unit_id, unit_data in snapshot["active"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": unit_data.get("status", "Unknown"),
+            "age": unit_data.get("age", "N/A"),
+            "last_seen": unit_data.get("last", "Never"),
+            "deployed": True,
+            "retired": False,
+            "out_for_calibration": False,
+            "ignored": False,
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "address": unit_data.get("address", ""),
+            "coordinates": unit_data.get("coordinates", ""),
+            "project_id": unit_data.get("project_id", ""),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "deployed_with_unit_id": unit_data.get("deployed_with_unit_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Add benched units
+    for unit_id, unit_data in snapshot["benched"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": unit_data.get("status", "N/A"),
+            "age": unit_data.get("age", "N/A"),
+            "last_seen": unit_data.get("last", "Never"),
+            "deployed": False,
+            "retired": False,
+            "out_for_calibration": False,
+            "ignored": False,
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "address": unit_data.get("address", ""),
+            "coordinates": unit_data.get("coordinates", ""),
+            "project_id": unit_data.get("project_id", ""),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "deployed_with_unit_id": unit_data.get("deployed_with_unit_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Add allocated units
+    for unit_id, unit_data in snapshot.get("allocated", {}).items():
+        units_list.append({
+            "id": unit_id,
+            "status": "Allocated",
+            "age": "N/A",
+            "last_seen": "N/A",
+            "deployed": False,
+            "retired": False,
+            "out_for_calibration": False,
+            "allocated": True,
+            "allocated_to_project_id": unit_data.get("allocated_to_project_id", ""),
+            "ignored": False,
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "address": unit_data.get("address", ""),
+            "coordinates": unit_data.get("coordinates", ""),
+            "project_id": unit_data.get("project_id", ""),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "deployed_with_unit_id": unit_data.get("deployed_with_unit_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Add out-for-calibration units
+    for unit_id, unit_data in snapshot["out_for_calibration"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": "Out for Calibration",
+            "age": "N/A",
+            "last_seen": "N/A",
+            "deployed": False,
+            "retired": False,
+            "out_for_calibration": True,
+            "ignored": False,
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "address": unit_data.get("address", ""),
+            "coordinates": unit_data.get("coordinates", ""),
+            "project_id": unit_data.get("project_id", ""),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "deployed_with_unit_id": unit_data.get("deployed_with_unit_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Add retired units
+    for unit_id, unit_data in snapshot["retired"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": "Retired",
+            "age": "N/A",
+            "last_seen": "N/A",
+            "deployed": False,
+            "retired": True,
+            "out_for_calibration": False,
+            "ignored": False,
+            "note": unit_data.get("note", ""),
+            "device_type": unit_data.get("device_type", "seismograph"),
+            "address": unit_data.get("address", ""),
+            "coordinates": unit_data.get("coordinates", ""),
+            "project_id": unit_data.get("project_id", ""),
+            "last_calibrated": unit_data.get("last_calibrated"),
+            "next_calibration_due": unit_data.get("next_calibration_due"),
+            "deployed_with_modem_id": unit_data.get("deployed_with_modem_id"),
+            "deployed_with_unit_id": unit_data.get("deployed_with_unit_id"),
+            "ip_address": unit_data.get("ip_address"),
+            "phone_number": unit_data.get("phone_number"),
+            "hardware_model": unit_data.get("hardware_model"),
+        })
+
+    # Add ignored units
+    for unit_id, unit_data in snapshot.get("ignored", {}).items():
+        units_list.append({
+            "id": unit_id,
+            "status": "Ignored",
+            "age": "N/A",
+            "last_seen": "N/A",
+            "deployed": False,
+            "retired": False,
+            "out_for_calibration": False,
+            "ignored": True,
+            "note": unit_data.get("note", unit_data.get("reason", "")),
+            "device_type": unit_data.get("device_type", "unknown"),
+            "address": "",
+            "coordinates": "",
+            "project_id": "",
+            "last_calibrated": None,
+            "next_calibration_due": None,
+            "deployed_with_modem_id": None,
+            "deployed_with_unit_id": None,
+            "ip_address": None,
+            "phone_number": None,
+            "hardware_model": None,
+        })
+
+    # Sort by status category, then by ID
+    def sort_key(unit):
+        # Priority: deployed (active) -> allocated -> benched -> out_for_calibration -> retired -> ignored
+        if unit["deployed"]:
+            return (0, unit["id"])
+        elif unit.get("allocated"):
+            return (1, unit["id"])
+        elif not unit["retired"] and not unit["out_for_calibration"] and not unit["ignored"]:
+            return (2, unit["id"])
+        elif unit["out_for_calibration"]:
+            return (3, unit["id"])
+        elif unit["retired"]:
+            return (4, unit["id"])
+        else:
+            return (5, unit["id"])
+
+    units_list.sort(key=sort_key)
+
+    return templates.TemplateResponse("partials/devices_table.html", {
+        "request": request,
+        "units": units_list,
+        "timestamp": datetime.now().strftime("%H:%M:%S"),
+        "user_timezone": get_user_timezone()
+    })
+
+
+@app.get("/health")
+def health_check():
+    """Health check endpoint"""
+    return {
+        "message": f"Seismo Fleet Manager v{VERSION}",
+        "status": "running",
+        "version": VERSION
+    }
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8001)

backend/migrate_add_allocated.py

@@ -0,0 +1,35 @@
+"""
+Migration: Add allocated and allocated_to_project_id columns to roster table.
+Run once: python backend/migrate_add_allocated.py
+"""
+import sqlite3
+import os
+
+DB_PATH = os.path.join(os.path.dirname(__file__), '..', 'data', 'seismo_fleet.db')
+
+def run():
+    conn = sqlite3.connect(DB_PATH)
+    cur = conn.cursor()
+
+    # Check existing columns
+    cur.execute("PRAGMA table_info(roster)")
+    cols = {row[1] for row in cur.fetchall()}
+
+    if 'allocated' not in cols:
+        cur.execute("ALTER TABLE roster ADD COLUMN allocated BOOLEAN DEFAULT 0 NOT NULL")
+        print("Added column: allocated")
+    else:
+        print("Column already exists: allocated")
+
+    if 'allocated_to_project_id' not in cols:
+        cur.execute("ALTER TABLE roster ADD COLUMN allocated_to_project_id VARCHAR")
+        print("Added column: allocated_to_project_id")
+    else:
+        print("Column already exists: allocated_to_project_id")
+
+    conn.commit()
+    conn.close()
+    print("Migration complete.")
+
+if __name__ == '__main__':
+    run()

backend/migrate_add_auto_increment_index.py

@@ -0,0 +1,67 @@
+"""
+Migration: Add auto_increment_index column to recurring_schedules table
+
+This migration adds the auto_increment_index column that controls whether
+the scheduler should automatically find an unused store index before starting
+a new measurement.
+
+Run this script once to update existing databases:
+    python -m backend.migrate_add_auto_increment_index
+"""
+
+import sqlite3
+import os
+
+DB_PATH = "data/seismo_fleet.db"
+
+
+def migrate():
+    """Add auto_increment_index column to recurring_schedules table."""
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        return False
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    try:
+        # Check if recurring_schedules table exists
+        cursor.execute("""
+            SELECT name FROM sqlite_master
+            WHERE type='table' AND name='recurring_schedules'
+        """)
+        if not cursor.fetchone():
+            print("recurring_schedules table does not exist yet. Will be created on app startup.")
+            conn.close()
+            return True
+
+        # Check if auto_increment_index column already exists
+        cursor.execute("PRAGMA table_info(recurring_schedules)")
+        columns = [row[1] for row in cursor.fetchall()]
+
+        if "auto_increment_index" in columns:
+            print("auto_increment_index column already exists in recurring_schedules table.")
+            conn.close()
+            return True
+
+        # Add the column
+        print("Adding auto_increment_index column to recurring_schedules table...")
+        cursor.execute("""
+            ALTER TABLE recurring_schedules
+            ADD COLUMN auto_increment_index BOOLEAN DEFAULT 1
+        """)
+        conn.commit()
+        print("Successfully added auto_increment_index column.")
+
+        conn.close()
+        return True
+
+    except Exception as e:
+        print(f"Migration failed: {e}")
+        conn.close()
+        return False
+
+
+if __name__ == "__main__":
+    success = migrate()
+    exit(0 if success else 1)

backend/migrate_add_deployment_records.py

@@ -0,0 +1,79 @@
+"""
+Migration: Add deployment_records table.
+
+Tracks each time a unit is sent to the field and returned.
+The active deployment is the row with actual_removal_date IS NULL.
+
+Run once per database:
+    python backend/migrate_add_deployment_records.py
+"""
+
+import sqlite3
+import os
+
+DB_PATH = "./data/seismo_fleet.db"
+
+
+def migrate_database():
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        return
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    try:
+        # Check if table already exists
+        cursor.execute("""
+            SELECT name FROM sqlite_master
+            WHERE type='table' AND name='deployment_records'
+        """)
+        if cursor.fetchone():
+            print("✓ deployment_records table already exists, skipping")
+            return
+
+        print("Creating deployment_records table...")
+        cursor.execute("""
+            CREATE TABLE deployment_records (
+                id TEXT PRIMARY KEY,
+                unit_id TEXT NOT NULL,
+                deployed_date DATE,
+                estimated_removal_date DATE,
+                actual_removal_date DATE,
+                project_ref TEXT,
+                project_id TEXT,
+                location_name TEXT,
+                notes TEXT,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+
+        cursor.execute("""
+            CREATE INDEX idx_deployment_records_unit_id
+            ON deployment_records(unit_id)
+        """)
+        cursor.execute("""
+            CREATE INDEX idx_deployment_records_project_id
+            ON deployment_records(project_id)
+        """)
+        # Index for finding active deployments quickly
+        cursor.execute("""
+            CREATE INDEX idx_deployment_records_active
+            ON deployment_records(unit_id, actual_removal_date)
+        """)
+
+        conn.commit()
+        print("✓ deployment_records table created successfully")
+        print("✓ Indexes created")
+
+    except Exception as e:
+        conn.rollback()
+        print(f"✗ Migration failed: {e}")
+        raise
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_add_deployment_type.py

@@ -0,0 +1,84 @@
+"""
+Migration script to add deployment_type and deployed_with_unit_id fields to roster table.
+
+deployment_type: tracks what type of device a modem is deployed with:
+- "seismograph" - Modem is connected to a seismograph
+- "slm" - Modem is connected to a sound level meter
+- NULL/empty - Not assigned or unknown
+
+deployed_with_unit_id: stores the ID of the seismograph/SLM this modem is deployed with
+(reverse relationship of deployed_with_modem_id)
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+
+def migrate_database():
+    """Add deployment_type and deployed_with_unit_id columns to roster table"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if roster table exists
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='roster'")
+    table_exists = cursor.fetchone()
+
+    if not table_exists:
+        print("Roster table does not exist yet - will be created when app runs")
+        conn.close()
+        return
+
+    # Check existing columns
+    cursor.execute("PRAGMA table_info(roster)")
+    columns = [col[1] for col in cursor.fetchall()]
+
+    try:
+        # Add deployment_type if not exists
+        if 'deployment_type' not in columns:
+            print("Adding deployment_type column to roster table...")
+            cursor.execute("ALTER TABLE roster ADD COLUMN deployment_type TEXT")
+            print("  Added deployment_type column")
+
+            cursor.execute("CREATE INDEX IF NOT EXISTS ix_roster_deployment_type ON roster(deployment_type)")
+            print("  Created index on deployment_type")
+        else:
+            print("deployment_type column already exists")
+
+        # Add deployed_with_unit_id if not exists
+        if 'deployed_with_unit_id' not in columns:
+            print("Adding deployed_with_unit_id column to roster table...")
+            cursor.execute("ALTER TABLE roster ADD COLUMN deployed_with_unit_id TEXT")
+            print("  Added deployed_with_unit_id column")
+
+            cursor.execute("CREATE INDEX IF NOT EXISTS ix_roster_deployed_with_unit_id ON roster(deployed_with_unit_id)")
+            print("  Created index on deployed_with_unit_id")
+        else:
+            print("deployed_with_unit_id column already exists")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_add_device_types.py

@@ -0,0 +1,84 @@
+"""
+Migration script to add device type support to the roster table.
+
+This adds columns for:
+- device_type (seismograph/modem discriminator)
+- Seismograph-specific fields (calibration dates, modem pairing)
+- Modem-specific fields (IP address, phone number, hardware model)
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+def migrate_database():
+    """Add new columns to the roster table"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if device_type column already exists
+    cursor.execute("PRAGMA table_info(roster)")
+    columns = [col[1] for col in cursor.fetchall()]
+
+    if "device_type" in columns:
+        print("Migration already applied - device_type column exists")
+        conn.close()
+        return
+
+    print("Adding new columns to roster table...")
+
+    try:
+        # Add device type discriminator
+        cursor.execute("ALTER TABLE roster ADD COLUMN device_type TEXT DEFAULT 'seismograph'")
+        print("  ✓ Added device_type column")
+
+        # Add seismograph-specific fields
+        cursor.execute("ALTER TABLE roster ADD COLUMN last_calibrated DATE")
+        print("  ✓ Added last_calibrated column")
+
+        cursor.execute("ALTER TABLE roster ADD COLUMN next_calibration_due DATE")
+        print("  ✓ Added next_calibration_due column")
+
+        cursor.execute("ALTER TABLE roster ADD COLUMN deployed_with_modem_id TEXT")
+        print("  ✓ Added deployed_with_modem_id column")
+
+        # Add modem-specific fields
+        cursor.execute("ALTER TABLE roster ADD COLUMN ip_address TEXT")
+        print("  ✓ Added ip_address column")
+
+        cursor.execute("ALTER TABLE roster ADD COLUMN phone_number TEXT")
+        print("  ✓ Added phone_number column")
+
+        cursor.execute("ALTER TABLE roster ADD COLUMN hardware_model TEXT")
+        print("  ✓ Added hardware_model column")
+
+        # Set all existing units to seismograph type
+        cursor.execute("UPDATE roster SET device_type = 'seismograph' WHERE device_type IS NULL")
+        print("  ✓ Set existing units to seismograph type")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_add_estimated_units.py

@@ -0,0 +1,62 @@
+"""
+Migration: Add estimated_units to job_reservations
+
+Adds column:
+- job_reservations.estimated_units: Estimated number of units for the reservation (nullable integer)
+"""
+
+import sqlite3
+import sys
+from pathlib import Path
+
+# Default database path (matches production pattern)
+DB_PATH = "./data/seismo_fleet.db"
+
+
+def migrate(db_path: str):
+    """Run the migration."""
+    print(f"Migrating database: {db_path}")
+
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    try:
+        # Check if job_reservations table exists
+        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='job_reservations'")
+        if not cursor.fetchone():
+            print("job_reservations table does not exist. Skipping migration.")
+            return
+
+        # Get existing columns in job_reservations
+        cursor.execute("PRAGMA table_info(job_reservations)")
+        existing_cols = {row[1] for row in cursor.fetchall()}
+
+        # Add estimated_units column if it doesn't exist
+        if 'estimated_units' not in existing_cols:
+            print("Adding estimated_units column to job_reservations...")
+            cursor.execute("ALTER TABLE job_reservations ADD COLUMN estimated_units INTEGER")
+        else:
+            print("estimated_units column already exists. Skipping.")
+
+        conn.commit()
+        print("Migration completed successfully!")
+
+    except Exception as e:
+        print(f"Migration failed: {e}")
+        conn.rollback()
+        raise
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    db_path = DB_PATH
+
+    if len(sys.argv) > 1:
+        db_path = sys.argv[1]
+
+    if not Path(db_path).exists():
+        print(f"Database not found: {db_path}")
+        sys.exit(1)
+
+    migrate(db_path)

backend/migrate_add_job_reservations.py

@@ -0,0 +1,103 @@
+"""
+Migration script to add job reservations for the Fleet Calendar feature.
+
+This creates two tables:
+- job_reservations: Track future unit assignments for jobs/projects
+- job_reservation_units: Link specific units to reservations
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+
+def migrate_database():
+    """Create the job_reservations and job_reservation_units tables"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if job_reservations table already exists
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='job_reservations'")
+    if cursor.fetchone():
+        print("Migration already applied - job_reservations table exists")
+        conn.close()
+        return
+
+    print("Creating job_reservations table...")
+
+    try:
+        # Create job_reservations table
+        cursor.execute("""
+            CREATE TABLE job_reservations (
+                id TEXT PRIMARY KEY,
+                name TEXT NOT NULL,
+                project_id TEXT,
+                start_date DATE NOT NULL,
+                end_date DATE NOT NULL,
+                assignment_type TEXT NOT NULL DEFAULT 'quantity',
+                device_type TEXT DEFAULT 'seismograph',
+                quantity_needed INTEGER,
+                notes TEXT,
+                color TEXT DEFAULT '#3B82F6',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        print("  Created job_reservations table")
+
+        # Create indexes for job_reservations
+        cursor.execute("CREATE INDEX idx_job_reservations_project_id ON job_reservations(project_id)")
+        print("  Created index on project_id")
+
+        cursor.execute("CREATE INDEX idx_job_reservations_dates ON job_reservations(start_date, end_date)")
+        print("  Created index on dates")
+
+        # Create job_reservation_units table
+        print("Creating job_reservation_units table...")
+        cursor.execute("""
+            CREATE TABLE job_reservation_units (
+                id TEXT PRIMARY KEY,
+                reservation_id TEXT NOT NULL,
+                unit_id TEXT NOT NULL,
+                assignment_source TEXT DEFAULT 'specific',
+                assigned_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                FOREIGN KEY (reservation_id) REFERENCES job_reservations(id),
+                FOREIGN KEY (unit_id) REFERENCES roster(id)
+            )
+        """)
+        print("  Created job_reservation_units table")
+
+        # Create indexes for job_reservation_units
+        cursor.execute("CREATE INDEX idx_job_reservation_units_reservation_id ON job_reservation_units(reservation_id)")
+        print("  Created index on reservation_id")
+
+        cursor.execute("CREATE INDEX idx_job_reservation_units_unit_id ON job_reservation_units(unit_id)")
+        print("  Created index on unit_id")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+        print("You can now use the Fleet Calendar to manage unit reservations.")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_add_location_slots.py

@@ -0,0 +1,24 @@
+"""
+Migration: Add location_slots column to job_reservations table.
+Stores the full ordered slot list (including empty/unassigned slots) as JSON.
+Run once per database.
+"""
+import sqlite3
+import os
+
+DB_PATH = os.environ.get("DB_PATH", "/app/data/seismo_fleet.db")
+
+def run():
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+    existing = [r[1] for r in cursor.execute("PRAGMA table_info(job_reservations)").fetchall()]
+    if "location_slots" not in existing:
+        cursor.execute("ALTER TABLE job_reservations ADD COLUMN location_slots TEXT")
+        conn.commit()
+        print("Added location_slots column to job_reservations.")
+    else:
+        print("location_slots column already exists, skipping.")
+    conn.close()
+
+if __name__ == "__main__":
+    run()

backend/migrate_add_oneoff_schedule_fields.py

@@ -0,0 +1,73 @@
+"""
+Migration: Add one-off schedule fields to recurring_schedules table
+
+Adds start_datetime and end_datetime columns for one-off recording schedules.
+
+Run this script once to update existing databases:
+    python -m backend.migrate_add_oneoff_schedule_fields
+"""
+
+import sqlite3
+import os
+
+DB_PATH = "data/seismo_fleet.db"
+
+
+def migrate():
+    """Add one-off schedule columns to recurring_schedules table."""
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        return False
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    try:
+        cursor.execute("""
+            SELECT name FROM sqlite_master
+            WHERE type='table' AND name='recurring_schedules'
+        """)
+        if not cursor.fetchone():
+            print("recurring_schedules table does not exist yet. Will be created on app startup.")
+            conn.close()
+            return True
+
+        cursor.execute("PRAGMA table_info(recurring_schedules)")
+        columns = [row[1] for row in cursor.fetchall()]
+
+        added = False
+
+        if "start_datetime" not in columns:
+            print("Adding start_datetime column to recurring_schedules table...")
+            cursor.execute("""
+                ALTER TABLE recurring_schedules
+                ADD COLUMN start_datetime DATETIME NULL
+            """)
+            added = True
+
+        if "end_datetime" not in columns:
+            print("Adding end_datetime column to recurring_schedules table...")
+            cursor.execute("""
+                ALTER TABLE recurring_schedules
+                ADD COLUMN end_datetime DATETIME NULL
+            """)
+            added = True
+
+        if added:
+            conn.commit()
+            print("Successfully added one-off schedule columns.")
+        else:
+            print("One-off schedule columns already exist.")
+
+        conn.close()
+        return True
+
+    except Exception as e:
+        print(f"Migration failed: {e}")
+        conn.close()
+        return False
+
+
+if __name__ == "__main__":
+    success = migrate()
+    exit(0 if success else 1)

backend/migrate_add_out_for_calibration.py

@@ -0,0 +1,54 @@
+"""
+Database Migration: Add out_for_calibration field to roster table
+
+Changes:
+- Adds out_for_calibration BOOLEAN column (default FALSE) to roster table
+- Safe to run multiple times (idempotent)
+- No data loss
+
+Usage:
+    python backend/migrate_add_out_for_calibration.py
+"""
+
+import sys
+import os
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from sqlalchemy import create_engine, text
+from sqlalchemy.orm import sessionmaker
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./data/seismo_fleet.db"
+engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def migrate():
+    db = SessionLocal()
+    try:
+        print("=" * 60)
+        print("Migration: Add out_for_calibration to roster")
+        print("=" * 60)
+
+        # Check if column already exists
+        result = db.execute(text("PRAGMA table_info(roster)")).fetchall()
+        columns = [row[1] for row in result]
+
+        if "out_for_calibration" in columns:
+            print("Column out_for_calibration already exists. Skipping.")
+        else:
+            db.execute(text("ALTER TABLE roster ADD COLUMN out_for_calibration BOOLEAN DEFAULT FALSE"))
+            db.commit()
+            print("Added out_for_calibration column to roster table.")
+
+        print("Migration complete.")
+    except Exception as e:
+        db.rollback()
+        print(f"Error: {e}")
+        raise
+    finally:
+        db.close()
+
+
+if __name__ == "__main__":
+    migrate()

backend/migrate_add_project_data_collection_mode.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+"""
+Migration: Add data_collection_mode column to projects table.
+
+Values:
+  "remote"  — units have modems; data pulled via FTP/scheduler automatically
+  "manual"  — no modem; SD cards retrieved daily and uploaded by hand
+
+All existing projects are backfilled to "manual" (safe conservative default).
+
+Run once inside the Docker container:
+    docker exec terra-view python3 backend/migrate_add_project_data_collection_mode.py
+"""
+from pathlib import Path
+
+DB_PATH = Path("data/seismo_fleet.db")
+
+
+def migrate():
+    import sqlite3
+
+    if not DB_PATH.exists():
+        print(f"Database not found at {DB_PATH}. Are you running from /home/serversdown/terra-view?")
+        return
+
+    conn = sqlite3.connect(DB_PATH)
+    conn.row_factory = sqlite3.Row
+    cur = conn.cursor()
+
+    # ── 1. Add column (idempotent) ───────────────────────────────────────────
+    cur.execute("PRAGMA table_info(projects)")
+    existing_cols = {row["name"] for row in cur.fetchall()}
+
+    if "data_collection_mode" not in existing_cols:
+        cur.execute("ALTER TABLE projects ADD COLUMN data_collection_mode TEXT DEFAULT 'manual'")
+        conn.commit()
+        print("✓ Added column data_collection_mode to projects")
+    else:
+        print("○ Column data_collection_mode already exists — skipping ALTER TABLE")
+
+    # ── 2. Backfill NULLs to 'manual' ────────────────────────────────────────
+    cur.execute("UPDATE projects SET data_collection_mode = 'manual' WHERE data_collection_mode IS NULL")
+    updated = cur.rowcount
+    conn.commit()
+    conn.close()
+
+    if updated:
+        print(f"✓ Backfilled {updated} project(s) to data_collection_mode='manual'.")
+    print("Migration complete.")
+
+
+if __name__ == "__main__":
+    migrate()

backend/migrate_add_project_deleted_at.py

@@ -0,0 +1,56 @@
+"""
+Migration: Add deleted_at column to projects table
+
+Adds columns:
+- projects.deleted_at: Timestamp set when status='deleted'; data hard-deleted after 60 days
+"""
+
+import sqlite3
+import sys
+from pathlib import Path
+
+
+def migrate(db_path: str):
+    """Run the migration."""
+    print(f"Migrating database: {db_path}")
+
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    try:
+        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='projects'")
+        if not cursor.fetchone():
+            print("projects table does not exist. Skipping migration.")
+            return
+
+        cursor.execute("PRAGMA table_info(projects)")
+        existing_cols = {row[1] for row in cursor.fetchall()}
+
+        if 'deleted_at' not in existing_cols:
+            print("Adding deleted_at column to projects...")
+            cursor.execute("ALTER TABLE projects ADD COLUMN deleted_at DATETIME")
+        else:
+            print("deleted_at column already exists. Skipping.")
+
+        conn.commit()
+        print("Migration completed successfully!")
+
+    except Exception as e:
+        print(f"Migration failed: {e}")
+        conn.rollback()
+        raise
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    db_path = "./data/seismo_fleet.db"
+
+    if len(sys.argv) > 1:
+        db_path = sys.argv[1]
+
+    if not Path(db_path).exists():
+        print(f"Database not found: {db_path}")
+        sys.exit(1)
+
+    migrate(db_path)

backend/migrate_add_project_modules.py

@@ -0,0 +1,71 @@
+"""
+Migration: Add project_modules table and seed from existing project_type_id values.
+
+Safe to run multiple times — idempotent.
+"""
+import sqlite3
+import uuid
+import os
+
+DB_PATH = os.path.join(os.path.dirname(__file__), "..", "data", "seismo_fleet.db")
+DB_PATH = os.path.abspath(DB_PATH)
+
+
+def run():
+    conn = sqlite3.connect(DB_PATH)
+    conn.row_factory = sqlite3.Row
+    cur = conn.cursor()
+
+    # 1. Create project_modules table if not exists
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS project_modules (
+            id TEXT PRIMARY KEY,
+            project_id TEXT NOT NULL,
+            module_type TEXT NOT NULL,
+            enabled INTEGER NOT NULL DEFAULT 1,
+            created_at TEXT NOT NULL DEFAULT (datetime('now')),
+            UNIQUE(project_id, module_type)
+        )
+    """)
+    print("  Table 'project_modules' ready.")
+
+    # 2. Seed modules from existing project_type_id values
+    cur.execute("SELECT id, project_type_id FROM projects WHERE project_type_id IS NOT NULL")
+    projects = cur.fetchall()
+
+    seeded = 0
+    for p in projects:
+        pid = p["id"]
+        ptype = p["project_type_id"]
+
+        modules_to_add = []
+        if ptype == "sound_monitoring":
+            modules_to_add = ["sound_monitoring"]
+        elif ptype == "vibration_monitoring":
+            modules_to_add = ["vibration_monitoring"]
+        elif ptype == "combined":
+            modules_to_add = ["sound_monitoring", "vibration_monitoring"]
+
+        for module_type in modules_to_add:
+            # INSERT OR IGNORE — skip if already exists
+            cur.execute("""
+                INSERT OR IGNORE INTO project_modules (id, project_id, module_type, enabled)
+                VALUES (?, ?, ?, 1)
+            """, (str(uuid.uuid4()), pid, module_type))
+            if cur.rowcount > 0:
+                seeded += 1
+
+    conn.commit()
+    print(f"  Seeded {seeded} module record(s) from existing project_type_id values.")
+
+    # 3. Make project_type_id nullable (SQLite doesn't support ALTER COLUMN,
+    #    but since we're just loosening a constraint this is a no-op in SQLite —
+    #    the column already accepts NULL in practice. Nothing to do.)
+    print("  project_type_id column is now treated as nullable (legacy field).")
+
+    conn.close()
+    print("Migration complete.")
+
+
+if __name__ == "__main__":
+    run()

backend/migrate_add_project_number.py

@@ -0,0 +1,80 @@
+"""
+Migration script to add project_number field to projects table.
+
+This adds a new column for TMI internal project numbering:
+- Format: xxxx-YY (e.g., "2567-23")
+- xxxx = incremental project number
+- YY = year project was started
+
+Combined with client_name and name (project/site name), this enables
+smart searching across all project identifiers.
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+
+def migrate_database():
+    """Add project_number column to projects table"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if projects table exists
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='projects'")
+    table_exists = cursor.fetchone()
+
+    if not table_exists:
+        print("Projects table does not exist yet - will be created when app runs")
+        conn.close()
+        return
+
+    # Check if project_number column already exists
+    cursor.execute("PRAGMA table_info(projects)")
+    columns = [col[1] for col in cursor.fetchall()]
+
+    if 'project_number' in columns:
+        print("Migration already applied - project_number column exists")
+        conn.close()
+        return
+
+    print("Adding project_number column to projects table...")
+
+    try:
+        cursor.execute("ALTER TABLE projects ADD COLUMN project_number TEXT")
+        print("  Added project_number column")
+
+        # Create index for faster searching
+        cursor.execute("CREATE INDEX IF NOT EXISTS ix_projects_project_number ON projects(project_number)")
+        print("  Created index on project_number")
+
+        # Also add index on client_name if it doesn't exist
+        cursor.execute("CREATE INDEX IF NOT EXISTS ix_projects_client_name ON projects(client_name)")
+        print("  Created index on client_name")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_add_report_templates.py

@@ -0,0 +1,88 @@
+"""
+Migration script to add report_templates table.
+
+This creates a new table for storing report generation configurations:
+- Template name and project association
+- Time filtering settings (start/end time)
+- Date range filtering (optional)
+- Report title defaults
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+def migrate_database():
+    """Create report_templates table"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if report_templates table already exists
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='report_templates'")
+    table_exists = cursor.fetchone()
+
+    if table_exists:
+        print("Migration already applied - report_templates table exists")
+        conn.close()
+        return
+
+    print("Creating report_templates table...")
+
+    try:
+        cursor.execute("""
+            CREATE TABLE report_templates (
+                id TEXT PRIMARY KEY,
+                name TEXT NOT NULL,
+                project_id TEXT,
+                report_title TEXT DEFAULT 'Background Noise Study',
+                start_time TEXT,
+                end_time TEXT,
+                start_date TEXT,
+                end_date TEXT,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        print("  ✓ Created report_templates table")
+
+        # Insert default templates
+        import uuid
+
+        default_templates = [
+            (str(uuid.uuid4()), "Nighttime (7PM-7AM)", None, "Background Noise Study", "19:00", "07:00", None, None),
+            (str(uuid.uuid4()), "Daytime (7AM-7PM)", None, "Background Noise Study", "07:00", "19:00", None, None),
+            (str(uuid.uuid4()), "Full Day (All Data)", None, "Background Noise Study", None, None, None, None),
+        ]
+
+        cursor.executemany("""
+            INSERT INTO report_templates (id, name, project_id, report_title, start_time, end_time, start_date, end_date)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+        """, default_templates)
+        print("  ✓ Inserted default templates (Nighttime, Daytime, Full Day)")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_add_session_device_model.py

@@ -0,0 +1,127 @@
+#!/usr/bin/env python3
+"""
+Migration: Add device_model column to monitoring_sessions table.
+
+Records which physical SLM model produced each session's data (e.g. "NL-43",
+"NL-53", "NL-32"). Used by report generation to apply the correct parsing
+logic without re-opening files to detect format.
+
+Run once inside the Docker container:
+    docker exec terra-view python3 backend/migrate_add_session_device_model.py
+
+Backfill strategy for existing rows:
+  1. If session.unit_id is set, use roster.slm_model for that unit.
+  2. Else, peek at the first .rnd file in the session: presence of the 'LAeq'
+     column header identifies AU2 / NL-32 format.
+  Sessions where neither hint is available remain NULL — the file-content
+  fallback in report code handles them transparently.
+"""
+import csv
+import io
+from pathlib import Path
+
+DB_PATH = Path("data/seismo_fleet.db")
+
+
+def _peek_first_row(abs_path: Path) -> dict:
+    """Read only the header + first data row of an RND file. Very cheap."""
+    try:
+        with open(abs_path, "r", encoding="utf-8", errors="replace") as f:
+            reader = csv.DictReader(f)
+            return next(reader, None) or {}
+    except Exception:
+        return {}
+
+
+def _detect_model_from_rnd(abs_path: Path) -> str | None:
+    """Return 'NL-32' if file uses AU2 column format, else None."""
+    row = _peek_first_row(abs_path)
+    if "LAeq" in row:
+        return "NL-32"
+    return None
+
+
+def migrate():
+    import sqlite3
+
+    if not DB_PATH.exists():
+        print(f"Database not found at {DB_PATH}. Are you running from /home/serversdown/terra-view?")
+        return
+
+    conn = sqlite3.connect(DB_PATH)
+    conn.row_factory = sqlite3.Row
+    cur = conn.cursor()
+
+    # ── 1. Add column (idempotent) ───────────────────────────────────────────
+    cur.execute("PRAGMA table_info(monitoring_sessions)")
+    existing_cols = {row["name"] for row in cur.fetchall()}
+
+    if "device_model" not in existing_cols:
+        cur.execute("ALTER TABLE monitoring_sessions ADD COLUMN device_model TEXT")
+        conn.commit()
+        print("✓ Added column device_model to monitoring_sessions")
+    else:
+        print("○ Column device_model already exists — skipping ALTER TABLE")
+
+    # ── 2. Backfill existing NULL rows ───────────────────────────────────────
+    cur.execute(
+        "SELECT id, unit_id FROM monitoring_sessions WHERE device_model IS NULL"
+    )
+    sessions = cur.fetchall()
+    print(f"Backfilling {len(sessions)} session(s) with device_model=NULL...")
+
+    updated = skipped = 0
+    for row in sessions:
+        session_id = row["id"]
+        unit_id = row["unit_id"]
+        device_model = None
+
+        # Strategy A: look up unit's slm_model from the roster
+        if unit_id:
+            cur.execute(
+                "SELECT slm_model FROM roster WHERE id = ?", (unit_id,)
+            )
+            unit_row = cur.fetchone()
+            if unit_row and unit_row["slm_model"]:
+                device_model = unit_row["slm_model"]
+
+        # Strategy B: detect from first .rnd file in the session
+        if device_model is None:
+            cur.execute(
+                """SELECT file_path FROM data_files
+                   WHERE session_id = ?
+                   AND lower(file_path) LIKE '%.rnd'
+                   LIMIT 1""",
+                (session_id,),
+            )
+            file_row = cur.fetchone()
+            if file_row:
+                abs_path = Path("data") / file_row["file_path"]
+                device_model = _detect_model_from_rnd(abs_path)
+                # None here means NL-43/NL-53 format (or unreadable file) —
+                # leave as NULL so the existing fallback applies.
+
+        if device_model:
+            cur.execute(
+                "UPDATE monitoring_sessions SET device_model = ? WHERE id = ?",
+                (device_model, session_id),
+            )
+            updated += 1
+        else:
+            skipped += 1
+
+    conn.commit()
+    conn.close()
+
+    print(f"✓ Backfilled {updated} session(s) with a device_model.")
+    if skipped:
+        print(
+            f"  {skipped} session(s) left as NULL "
+            "(no unit link and no AU2 file hint — NL-43/NL-53 or unknown; "
+            "file-content detection applies at report time)."
+        )
+    print("Migration complete.")
+
+
+if __name__ == "__main__":
+    migrate()

backend/migrate_add_session_period_hours.py

@@ -0,0 +1,42 @@
+"""
+Migration: add period_start_hour and period_end_hour to monitoring_sessions.
+
+Run once:
+    python backend/migrate_add_session_period_hours.py
+
+Or inside the container:
+    docker exec terra-view python3 backend/migrate_add_session_period_hours.py
+"""
+
+import sys
+import os
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from backend.database import engine
+from sqlalchemy import text
+
+def run():
+    with engine.connect() as conn:
+        # Check which columns already exist
+        result = conn.execute(text("PRAGMA table_info(monitoring_sessions)"))
+        existing = {row[1] for row in result}
+
+        added = []
+        for col, definition in [
+            ("period_start_hour", "INTEGER"),
+            ("period_end_hour",   "INTEGER"),
+        ]:
+            if col not in existing:
+                conn.execute(text(f"ALTER TABLE monitoring_sessions ADD COLUMN {col} {definition}"))
+                added.append(col)
+            else:
+                print(f"  Column '{col}' already exists — skipping.")
+
+        conn.commit()
+
+        if added:
+            print(f"  Added columns: {', '.join(added)}")
+        print("Migration complete.")
+
+if __name__ == "__main__":
+    run()

backend/migrate_add_session_period_type.py

@@ -0,0 +1,131 @@
+#!/usr/bin/env python3
+"""
+Migration: Add session_label and period_type columns to monitoring_sessions.
+
+session_label  - user-editable display name, e.g. "NRL-1 Sun 2/23 Night"
+period_type    - one of: weekday_day | weekday_night | weekend_day | weekend_night
+                 Auto-derived from started_at when NULL.
+
+Period definitions (used in report stats table):
+  weekday_day   Mon-Fri  07:00-22:00  -> Daytime (7AM-10PM)
+  weekday_night Mon-Fri  22:00-07:00  -> Nighttime (10PM-7AM)
+  weekend_day   Sat-Sun  07:00-22:00  -> Daytime (7AM-10PM)
+  weekend_night Sat-Sun  22:00-07:00  -> Nighttime (10PM-7AM)
+
+Run once inside the Docker container:
+    docker exec terra-view python3 backend/migrate_add_session_period_type.py
+"""
+from pathlib import Path
+from datetime import datetime
+
+DB_PATH = Path("data/seismo_fleet.db")
+
+
+def _derive_period_type(started_at_str: str) -> str | None:
+    """Derive period_type from a started_at ISO datetime string."""
+    if not started_at_str:
+        return None
+    try:
+        dt = datetime.fromisoformat(started_at_str)
+    except ValueError:
+        return None
+    is_weekend = dt.weekday() >= 5  # 5=Sat, 6=Sun
+    is_night = dt.hour >= 22 or dt.hour < 7
+    if is_weekend:
+        return "weekend_night" if is_night else "weekend_day"
+    else:
+        return "weekday_night" if is_night else "weekday_day"
+
+
+def _build_label(started_at_str: str, location_name: str | None, period_type: str | None) -> str | None:
+    """Build a human-readable session label."""
+    if not started_at_str:
+        return None
+    try:
+        dt = datetime.fromisoformat(started_at_str)
+    except ValueError:
+        return None
+
+    day_abbr = dt.strftime("%a")   # Mon, Tue, Sun, etc.
+    date_str = dt.strftime("%-m/%-d")  # 2/23
+
+    period_labels = {
+        "weekday_day":   "Day",
+        "weekday_night": "Night",
+        "weekend_day":   "Day",
+        "weekend_night": "Night",
+    }
+    period_str = period_labels.get(period_type or "", "")
+
+    parts = []
+    if location_name:
+        parts.append(location_name)
+    parts.append(f"{day_abbr} {date_str}")
+    if period_str:
+        parts.append(period_str)
+    return " — ".join(parts)
+
+
+def migrate():
+    import sqlite3
+
+    if not DB_PATH.exists():
+        print(f"Database not found at {DB_PATH}. Are you running from /home/serversdown/terra-view?")
+        return
+
+    conn = sqlite3.connect(DB_PATH)
+    conn.row_factory = sqlite3.Row
+    cur = conn.cursor()
+
+    # 1. Add columns (idempotent)
+    cur.execute("PRAGMA table_info(monitoring_sessions)")
+    existing_cols = {row["name"] for row in cur.fetchall()}
+
+    for col, typedef in [("session_label", "TEXT"), ("period_type", "TEXT")]:
+        if col not in existing_cols:
+            cur.execute(f"ALTER TABLE monitoring_sessions ADD COLUMN {col} {typedef}")
+            conn.commit()
+            print(f"✓ Added column {col} to monitoring_sessions")
+        else:
+            print(f"○ Column {col} already exists — skipping ALTER TABLE")
+
+    # 2. Backfill existing rows
+    cur.execute(
+        """SELECT ms.id, ms.started_at, ms.location_id
+           FROM monitoring_sessions ms
+           WHERE ms.period_type IS NULL OR ms.session_label IS NULL"""
+    )
+    sessions = cur.fetchall()
+    print(f"Backfilling {len(sessions)} session(s)...")
+
+    updated = 0
+    for row in sessions:
+        session_id = row["id"]
+        started_at = row["started_at"]
+        location_id = row["location_id"]
+
+        # Look up location name
+        location_name = None
+        if location_id:
+            cur.execute("SELECT name FROM monitoring_locations WHERE id = ?", (location_id,))
+            loc_row = cur.fetchone()
+            if loc_row:
+                location_name = loc_row["name"]
+
+        period_type = _derive_period_type(started_at)
+        label = _build_label(started_at, location_name, period_type)
+
+        cur.execute(
+            "UPDATE monitoring_sessions SET period_type = ?, session_label = ? WHERE id = ?",
+            (period_type, label, session_id),
+        )
+        updated += 1
+
+    conn.commit()
+    conn.close()
+    print(f"✓ Backfilled {updated} session(s).")
+    print("Migration complete.")
+
+
+if __name__ == "__main__":
+    migrate()

backend/migrate_add_session_report_date.py

@@ -0,0 +1,41 @@
+"""
+Migration: add report_date to monitoring_sessions.
+
+Run once:
+    python backend/migrate_add_session_report_date.py
+
+Or inside the container:
+    docker exec terra-view-terra-view-1 python3 backend/migrate_add_session_report_date.py
+"""
+
+import sys
+import os
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from backend.database import engine
+from sqlalchemy import text
+
+def run():
+    with engine.connect() as conn:
+        # Check which columns already exist
+        result = conn.execute(text("PRAGMA table_info(monitoring_sessions)"))
+        existing = {row[1] for row in result}
+
+        added = []
+        for col, definition in [
+            ("report_date", "DATE"),
+        ]:
+            if col not in existing:
+                conn.execute(text(f"ALTER TABLE monitoring_sessions ADD COLUMN {col} {definition}"))
+                added.append(col)
+            else:
+                print(f"  Column '{col}' already exists — skipping.")
+
+        conn.commit()
+
+        if added:
+            print(f"  Added columns: {', '.join(added)}")
+        print("Migration complete.")
+
+if __name__ == "__main__":
+    run()

backend/migrate_add_slm_fields.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+"""
+Database migration: Add sound level meter fields to roster table.
+
+Adds columns for sound_level_meter device type support.
+"""
+
+import sqlite3
+from pathlib import Path
+
+def migrate():
+    """Add SLM fields to roster table if they don't exist."""
+
+    # Try multiple possible database locations
+    possible_paths = [
+        Path("data/seismo_fleet.db"),
+        Path("data/sfm.db"),
+        Path("data/seismo.db"),
+    ]
+
+    db_path = None
+    for path in possible_paths:
+        if path.exists():
+            db_path = path
+            break
+
+    if db_path is None:
+        print(f"Database not found in any of: {[str(p) for p in possible_paths]}")
+        print("Creating database with models.py will include new fields automatically.")
+        return
+
+    print(f"Using database: {db_path}")
+
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    # Check if columns already exist
+    cursor.execute("PRAGMA table_info(roster)")
+    existing_columns = {row[1] for row in cursor.fetchall()}
+
+    new_columns = {
+        "slm_host": "TEXT",
+        "slm_tcp_port": "INTEGER",
+        "slm_model": "TEXT",
+        "slm_serial_number": "TEXT",
+        "slm_frequency_weighting": "TEXT",
+        "slm_time_weighting": "TEXT",
+        "slm_measurement_range": "TEXT",
+        "slm_last_check": "DATETIME",
+    }
+
+    migrations_applied = []
+
+    for column_name, column_type in new_columns.items():
+        if column_name not in existing_columns:
+            try:
+                cursor.execute(f"ALTER TABLE roster ADD COLUMN {column_name} {column_type}")
+                migrations_applied.append(column_name)
+                print(f"✓ Added column: {column_name} ({column_type})")
+            except sqlite3.OperationalError as e:
+                print(f"✗ Failed to add column {column_name}: {e}")
+        else:
+            print(f"○ Column already exists: {column_name}")
+
+    conn.commit()
+    conn.close()
+
+    if migrations_applied:
+        print(f"\n✓ Migration complete! Added {len(migrations_applied)} new columns.")
+    else:
+        print("\n○ No migration needed - all columns already exist.")
+
+    print("\nSound level meter fields are now available in the roster table.")
+    print("Note: Use device_type='slm' for Sound Level Meters. Legacy 'sound_level_meter' has been deprecated.")
+
+
+if __name__ == "__main__":
+    migrate()

backend/migrate_add_tbd_dates.py

@@ -0,0 +1,89 @@
+"""
+Migration: Add TBD date support to job reservations
+
+Adds columns:
+- job_reservations.estimated_end_date: For planning when end is TBD
+- job_reservations.end_date_tbd: Boolean flag for TBD end dates
+- job_reservation_units.unit_start_date: Unit-specific start (for swaps)
+- job_reservation_units.unit_end_date: Unit-specific end (for swaps)
+- job_reservation_units.unit_end_tbd: Unit-specific TBD flag
+- job_reservation_units.notes: Notes for the assignment
+
+Also makes job_reservations.end_date nullable.
+"""
+
+import sqlite3
+import sys
+from pathlib import Path
+
+def migrate(db_path: str):
+    """Run the migration."""
+    print(f"Migrating database: {db_path}")
+
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    try:
+        # Check if job_reservations table exists
+        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='job_reservations'")
+        if not cursor.fetchone():
+            print("job_reservations table does not exist. Skipping migration.")
+            return
+
+        # Get existing columns in job_reservations
+        cursor.execute("PRAGMA table_info(job_reservations)")
+        existing_cols = {row[1] for row in cursor.fetchall()}
+
+        # Add new columns to job_reservations if they don't exist
+        if 'estimated_end_date' not in existing_cols:
+            print("Adding estimated_end_date column to job_reservations...")
+            cursor.execute("ALTER TABLE job_reservations ADD COLUMN estimated_end_date DATE")
+
+        if 'end_date_tbd' not in existing_cols:
+            print("Adding end_date_tbd column to job_reservations...")
+            cursor.execute("ALTER TABLE job_reservations ADD COLUMN end_date_tbd BOOLEAN DEFAULT 0")
+
+        # Get existing columns in job_reservation_units
+        cursor.execute("PRAGMA table_info(job_reservation_units)")
+        unit_cols = {row[1] for row in cursor.fetchall()}
+
+        # Add new columns to job_reservation_units if they don't exist
+        if 'unit_start_date' not in unit_cols:
+            print("Adding unit_start_date column to job_reservation_units...")
+            cursor.execute("ALTER TABLE job_reservation_units ADD COLUMN unit_start_date DATE")
+
+        if 'unit_end_date' not in unit_cols:
+            print("Adding unit_end_date column to job_reservation_units...")
+            cursor.execute("ALTER TABLE job_reservation_units ADD COLUMN unit_end_date DATE")
+
+        if 'unit_end_tbd' not in unit_cols:
+            print("Adding unit_end_tbd column to job_reservation_units...")
+            cursor.execute("ALTER TABLE job_reservation_units ADD COLUMN unit_end_tbd BOOLEAN DEFAULT 0")
+
+        if 'notes' not in unit_cols:
+            print("Adding notes column to job_reservation_units...")
+            cursor.execute("ALTER TABLE job_reservation_units ADD COLUMN notes TEXT")
+
+        conn.commit()
+        print("Migration completed successfully!")
+
+    except Exception as e:
+        print(f"Migration failed: {e}")
+        conn.rollback()
+        raise
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    # Default to dev database
+    db_path = "./data-dev/seismo_fleet.db"
+
+    if len(sys.argv) > 1:
+        db_path = sys.argv[1]
+
+    if not Path(db_path).exists():
+        print(f"Database not found: {db_path}")
+        sys.exit(1)
+
+    migrate(db_path)

backend/migrate_add_unit_history.py

@@ -0,0 +1,78 @@
+"""
+Migration script to add unit history timeline support.
+
+This creates the unit_history table to track all changes to units:
+- Note changes (archived old notes, new notes)
+- Deployment status changes (deployed/benched)
+- Retired status changes
+- Other field changes
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+def migrate_database():
+    """Create the unit_history table"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if unit_history table already exists
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='unit_history'")
+    if cursor.fetchone():
+        print("Migration already applied - unit_history table exists")
+        conn.close()
+        return
+
+    print("Creating unit_history table...")
+
+    try:
+        cursor.execute("""
+            CREATE TABLE unit_history (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                unit_id TEXT NOT NULL,
+                change_type TEXT NOT NULL,
+                field_name TEXT,
+                old_value TEXT,
+                new_value TEXT,
+                changed_at TIMESTAMP NOT NULL,
+                source TEXT DEFAULT 'manual',
+                notes TEXT
+            )
+        """)
+        print("  ✓ Created unit_history table")
+
+        # Create indexes for better query performance
+        cursor.execute("CREATE INDEX idx_unit_history_unit_id ON unit_history(unit_id)")
+        print("  ✓ Created index on unit_id")
+
+        cursor.execute("CREATE INDEX idx_unit_history_changed_at ON unit_history(changed_at)")
+        print("  ✓ Created index on changed_at")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+        print("Units will now track their complete history of changes.")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_add_user_preferences.py

@@ -0,0 +1,80 @@
+"""
+Migration script to add user_preferences table.
+
+This creates a new table for storing persistent user preferences:
+- Display settings (timezone, theme, date format)
+- Auto-refresh configuration
+- Calibration defaults
+- Status threshold customization
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+def migrate_database():
+    """Create user_preferences table"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if user_preferences table already exists
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='user_preferences'")
+    table_exists = cursor.fetchone()
+
+    if table_exists:
+        print("Migration already applied - user_preferences table exists")
+        conn.close()
+        return
+
+    print("Creating user_preferences table...")
+
+    try:
+        cursor.execute("""
+            CREATE TABLE user_preferences (
+                id INTEGER PRIMARY KEY DEFAULT 1,
+                timezone TEXT DEFAULT 'America/New_York',
+                theme TEXT DEFAULT 'auto',
+                auto_refresh_interval INTEGER DEFAULT 10,
+                date_format TEXT DEFAULT 'MM/DD/YYYY',
+                table_rows_per_page INTEGER DEFAULT 25,
+                calibration_interval_days INTEGER DEFAULT 365,
+                calibration_warning_days INTEGER DEFAULT 30,
+                status_ok_threshold_hours INTEGER DEFAULT 12,
+                status_pending_threshold_hours INTEGER DEFAULT 24,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        print("  ✓ Created user_preferences table")
+
+        # Insert default preferences
+        cursor.execute("""
+            INSERT INTO user_preferences (id) VALUES (1)
+        """)
+        print("  ✓ Inserted default preferences")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/migrate_fix_end_date_nullable.py

@@ -0,0 +1,105 @@
+"""
+Migration: Make job_reservations.end_date nullable for TBD support
+
+SQLite doesn't support ALTER COLUMN, so we need to:
+1. Create a new table with the correct schema
+2. Copy data
+3. Drop old table
+4. Rename new table
+"""
+
+import sqlite3
+import sys
+from pathlib import Path
+
+def migrate(db_path: str):
+    """Run the migration."""
+    print(f"Migrating database: {db_path}")
+
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    try:
+        # Check if job_reservations table exists
+        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='job_reservations'")
+        if not cursor.fetchone():
+            print("job_reservations table does not exist. Skipping migration.")
+            return
+
+        # Check current schema
+        cursor.execute("PRAGMA table_info(job_reservations)")
+        columns = cursor.fetchall()
+        col_info = {row[1]: row for row in columns}
+
+        # Check if end_date is already nullable (notnull=0)
+        if 'end_date' in col_info and col_info['end_date'][3] == 0:
+            print("end_date is already nullable. Skipping table recreation.")
+            return
+
+        print("Recreating job_reservations table with nullable end_date...")
+
+        # Create new table with correct schema
+        cursor.execute("""
+            CREATE TABLE job_reservations_new (
+                id TEXT PRIMARY KEY,
+                name TEXT NOT NULL,
+                project_id TEXT,
+                start_date DATE NOT NULL,
+                end_date DATE,
+                estimated_end_date DATE,
+                end_date_tbd BOOLEAN DEFAULT 0,
+                assignment_type TEXT NOT NULL DEFAULT 'quantity',
+                device_type TEXT DEFAULT 'seismograph',
+                quantity_needed INTEGER,
+                notes TEXT,
+                color TEXT DEFAULT '#3B82F6',
+                created_at DATETIME,
+                updated_at DATETIME
+            )
+        """)
+
+        # Copy existing data
+        cursor.execute("""
+            INSERT INTO job_reservations_new
+            SELECT
+                id, name, project_id, start_date, end_date,
+                COALESCE(estimated_end_date, NULL) as estimated_end_date,
+                COALESCE(end_date_tbd, 0) as end_date_tbd,
+                assignment_type, device_type, quantity_needed, notes, color,
+                created_at, updated_at
+            FROM job_reservations
+        """)
+
+        # Drop old table
+        cursor.execute("DROP TABLE job_reservations")
+
+        # Rename new table
+        cursor.execute("ALTER TABLE job_reservations_new RENAME TO job_reservations")
+
+        # Recreate index
+        cursor.execute("CREATE INDEX IF NOT EXISTS ix_job_reservations_id ON job_reservations (id)")
+        cursor.execute("CREATE INDEX IF NOT EXISTS ix_job_reservations_project_id ON job_reservations (project_id)")
+
+        conn.commit()
+        print("Migration completed successfully!")
+
+    except Exception as e:
+        print(f"Migration failed: {e}")
+        conn.rollback()
+        raise
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    # Default to dev database
+    db_path = "./data-dev/seismo_fleet.db"
+
+    if len(sys.argv) > 1:
+        db_path = sys.argv[1]
+
+    if not Path(db_path).exists():
+        print(f"Database not found: {db_path}")
+        sys.exit(1)
+
+    migrate(db_path)

backend/migrate_rename_recording_to_monitoring_sessions.py

@@ -0,0 +1,54 @@
+"""
+Migration: Rename recording_sessions table to monitoring_sessions
+
+Renames the table and updates the model name from RecordingSession to MonitoringSession.
+Run once per database: python backend/migrate_rename_recording_to_monitoring_sessions.py
+"""
+
+import sqlite3
+import sys
+from pathlib import Path
+
+
+def migrate(db_path: str):
+    """Run the migration."""
+    print(f"Migrating database: {db_path}")
+
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    try:
+        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='recording_sessions'")
+        if not cursor.fetchone():
+            cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='monitoring_sessions'")
+            if cursor.fetchone():
+                print("monitoring_sessions table already exists. Skipping migration.")
+            else:
+                print("recording_sessions table does not exist. Skipping migration.")
+            return
+
+        print("Renaming recording_sessions -> monitoring_sessions...")
+        cursor.execute("ALTER TABLE recording_sessions RENAME TO monitoring_sessions")
+
+        conn.commit()
+        print("Migration completed successfully!")
+
+    except Exception as e:
+        print(f"Migration failed: {e}")
+        conn.rollback()
+        raise
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    db_path = "./data/seismo_fleet.db"
+
+    if len(sys.argv) > 1:
+        db_path = sys.argv[1]
+
+    if not Path(db_path).exists():
+        print(f"Database not found: {db_path}")
+        sys.exit(1)
+
+    migrate(db_path)

backend/migrate_standardize_device_types.py

@@ -0,0 +1,106 @@
+"""
+Database Migration: Standardize device_type values
+
+This migration ensures all device_type values follow the official schema:
+- "seismograph" - Seismic monitoring devices
+- "modem" - Field modems and network equipment
+- "slm" - Sound level meters (NL-43/NL-53)
+
+Changes:
+- Converts "sound_level_meter" → "slm"
+- Safe to run multiple times (idempotent)
+- No data loss
+
+Usage:
+    python backend/migrate_standardize_device_types.py
+"""
+
+import sys
+import os
+
+# Add parent directory to path so we can import backend modules
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from sqlalchemy import create_engine, text
+from sqlalchemy.orm import sessionmaker
+
+# Database configuration
+SQLALCHEMY_DATABASE_URL = "sqlite:///./data/seismo_fleet.db"
+engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def migrate():
+    """Standardize device_type values in the database"""
+    db = SessionLocal()
+
+    try:
+        print("=" * 70)
+        print("Database Migration: Standardize device_type values")
+        print("=" * 70)
+        print()
+
+        # Check for existing "sound_level_meter" values
+        result = db.execute(
+            text("SELECT COUNT(*) as count FROM roster WHERE device_type = 'sound_level_meter'")
+        ).fetchone()
+
+        count_to_migrate = result[0] if result else 0
+
+        if count_to_migrate == 0:
+            print("✓ No records need migration - all device_type values are already standardized")
+            print()
+            print("Current device_type distribution:")
+
+            # Show distribution
+            distribution = db.execute(
+                text("SELECT device_type, COUNT(*) as count FROM roster GROUP BY device_type ORDER BY count DESC")
+            ).fetchall()
+
+            for row in distribution:
+                device_type, count = row
+                print(f"  - {device_type}: {count} units")
+
+            print()
+            print("Migration not needed.")
+            return
+
+        print(f"Found {count_to_migrate} record(s) with device_type='sound_level_meter'")
+        print()
+        print("Converting 'sound_level_meter' → 'slm'...")
+
+        # Perform the migration
+        db.execute(
+            text("UPDATE roster SET device_type = 'slm' WHERE device_type = 'sound_level_meter'")
+        )
+        db.commit()
+
+        print(f"✓ Successfully migrated {count_to_migrate} record(s)")
+        print()
+
+        # Show final distribution
+        print("Updated device_type distribution:")
+        distribution = db.execute(
+            text("SELECT device_type, COUNT(*) as count FROM roster GROUP BY device_type ORDER BY count DESC")
+        ).fetchall()
+
+        for row in distribution:
+            device_type, count = row
+            print(f"  - {device_type}: {count} units")
+
+        print()
+        print("=" * 70)
+        print("Migration completed successfully!")
+        print("=" * 70)
+
+    except Exception as e:
+        db.rollback()
+        print(f"\n❌ Error during migration: {e}")
+        print("\nRolling back changes...")
+        raise
+    finally:
+        db.close()
+
+
+if __name__ == "__main__":
+    migrate()

backend/models.py

@@ -0,0 +1,593 @@
+from sqlalchemy import Column, String, DateTime, Boolean, Text, Date, Integer, UniqueConstraint
+from datetime import datetime
+from backend.database import Base
+
+
+class Emitter(Base):
+    __tablename__ = "emitters"
+
+    id = Column(String, primary_key=True, index=True)
+    unit_type = Column(String, nullable=False)
+    last_seen = Column(DateTime, default=datetime.utcnow)
+    last_file = Column(String, nullable=False)
+    status = Column(String, nullable=False)
+    notes = Column(String, nullable=True)
+
+
+class RosterUnit(Base):
+    """
+    Roster table: represents our *intended assignment* of a unit.
+    This is editable from the GUI.
+
+    Supports multiple device types with type-specific fields:
+    - "seismograph" - Seismic monitoring devices (default)
+    - "modem" - Field modems and network equipment
+    - "slm" - Sound level meters (NL-43/NL-53)
+    """
+    __tablename__ = "roster"
+
+    # Core fields (all device types)
+    id = Column(String, primary_key=True, index=True)
+    unit_type = Column(String, default="series3")  # Backward compatibility
+    device_type = Column(String, default="seismograph")  # "seismograph" | "modem" | "slm"
+    deployed = Column(Boolean, default=True)
+    retired = Column(Boolean, default=False)
+    out_for_calibration = Column(Boolean, default=False)
+    allocated = Column(Boolean, default=False)  # Staged for an upcoming job, not yet deployed
+    allocated_to_project_id = Column(String, nullable=True)  # Which project it's allocated to
+    note = Column(String, nullable=True)
+    project_id = Column(String, nullable=True)
+    location = Column(String, nullable=True)  # Legacy field - use address/coordinates instead
+    address = Column(String, nullable=True)  # Human-readable address
+    coordinates = Column(String, nullable=True)  # Lat,Lon format: "34.0522,-118.2437"
+    last_updated = Column(DateTime, default=datetime.utcnow)
+
+    # Seismograph-specific fields (nullable for modems and SLMs)
+    last_calibrated = Column(Date, nullable=True)
+    next_calibration_due = Column(Date, nullable=True)
+
+    # Modem assignment (shared by seismographs and SLMs)
+    deployed_with_modem_id = Column(String, nullable=True)  # FK to another RosterUnit (device_type=modem)
+
+    # Modem-specific fields (nullable for seismographs and SLMs)
+    ip_address = Column(String, nullable=True)
+    phone_number = Column(String, nullable=True)
+    hardware_model = Column(String, nullable=True)
+    deployment_type = Column(String, nullable=True)  # "seismograph" | "slm" - what type of device this modem is deployed with
+    deployed_with_unit_id = Column(String, nullable=True)  # ID of seismograph/SLM this modem is deployed with
+
+    # Sound Level Meter-specific fields (nullable for seismographs and modems)
+    slm_host = Column(String, nullable=True)  # Device IP or hostname
+    slm_tcp_port = Column(Integer, nullable=True)  # TCP control port (default 2255)
+    slm_ftp_port = Column(Integer, nullable=True)  # FTP data retrieval port (default 21)
+    slm_model = Column(String, nullable=True)  # NL-43, NL-53, etc.
+    slm_serial_number = Column(String, nullable=True)  # Device serial number
+    slm_frequency_weighting = Column(String, nullable=True)  # A, C, Z
+    slm_time_weighting = Column(String, nullable=True)  # F (Fast), S (Slow), I (Impulse)
+    slm_measurement_range = Column(String, nullable=True)  # e.g., "30-130 dB"
+    slm_last_check = Column(DateTime, nullable=True)  # Last communication check
+
+
+class WatcherAgent(Base):
+    """
+    Watcher agents: tracks the watcher processes (series3-watcher, thor-watcher)
+    that run on field machines and report unit heartbeats.
+
+    Updated on every heartbeat received from each source_id.
+    """
+    __tablename__ = "watcher_agents"
+
+    id = Column(String, primary_key=True, index=True)        # source_id (hostname)
+    source_type = Column(String, nullable=False)              # series3_watcher | series4_watcher
+    version = Column(String, nullable=True)                   # e.g. "1.4.0"
+    last_seen = Column(DateTime, default=datetime.utcnow)
+    status = Column(String, nullable=False, default="unknown") # ok | pending | missing | error | unknown
+    ip_address = Column(String, nullable=True)
+    log_tail = Column(Text, nullable=True)                    # last N log lines (JSON array of strings)
+    update_pending = Column(Boolean, default=False)           # set True to trigger remote update
+    update_version = Column(String, nullable=True)            # target version to update to
+
+
+class IgnoredUnit(Base):
+    """
+    Ignored units: units that report but should be filtered out from unknown emitters.
+    Used to suppress noise from old projects.
+    """
+    __tablename__ = "ignored_units"
+
+    id = Column(String, primary_key=True, index=True)
+    reason = Column(String, nullable=True)
+    ignored_at = Column(DateTime, default=datetime.utcnow)
+
+
+class UnitHistory(Base):
+    """
+    Unit history: complete timeline of changes to each unit.
+    Tracks note changes, status changes, deployment/benched events, and more.
+    """
+    __tablename__ = "unit_history"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    unit_id = Column(String, nullable=False, index=True)  # FK to RosterUnit.id
+    change_type = Column(String, nullable=False)  # note_change, deployed_change, retired_change, etc.
+    field_name = Column(String, nullable=True)  # Which field changed
+    old_value = Column(Text, nullable=True)  # Previous value
+    new_value = Column(Text, nullable=True)  # New value
+    changed_at = Column(DateTime, default=datetime.utcnow, nullable=False, index=True)
+    source = Column(String, default="manual")  # manual, csv_import, telemetry, offline_sync
+    notes = Column(Text, nullable=True)  # Optional reason/context for the change
+
+
+class UserPreferences(Base):
+    """
+    User preferences: persistent storage for application settings.
+    Single-row table (id=1) to store global user preferences.
+    """
+    __tablename__ = "user_preferences"
+
+    id = Column(Integer, primary_key=True, default=1)
+    timezone = Column(String, default="America/New_York")
+    theme = Column(String, default="auto")  # auto, light, dark
+    auto_refresh_interval = Column(Integer, default=10)  # seconds
+    date_format = Column(String, default="MM/DD/YYYY")
+    table_rows_per_page = Column(Integer, default=25)
+    calibration_interval_days = Column(Integer, default=365)
+    calibration_warning_days = Column(Integer, default=30)
+    status_ok_threshold_hours = Column(Integer, default=12)
+    status_pending_threshold_hours = Column(Integer, default=24)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+# ============================================================================
+# Project Management System
+# ============================================================================
+
+class ProjectType(Base):
+    """
+    Project type templates: defines available project types and their capabilities.
+    Pre-populated with: sound_monitoring, vibration_monitoring, combined.
+    """
+    __tablename__ = "project_types"
+
+    id = Column(String, primary_key=True)  # sound_monitoring, vibration_monitoring, combined
+    name = Column(String, nullable=False, unique=True)  # "Sound Monitoring", "Vibration Monitoring"
+    description = Column(Text, nullable=True)
+    icon = Column(String, nullable=True)  # Icon identifier for UI
+    supports_sound = Column(Boolean, default=False)  # Enables SLM features
+    supports_vibration = Column(Boolean, default=False)  # Enables seismograph features
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+
+class Project(Base):
+    """
+    Projects: top-level organization for monitoring work.
+    Type-aware to enable/disable features based on project_type_id.
+
+    Project naming convention:
+    - project_number: TMI internal ID format xxxx-YY (e.g., "2567-23")
+    - client_name: Client/contractor name (e.g., "PJ Dick")
+    - name: Project/site name (e.g., "RKM Hall", "CMU Campus")
+
+    Display format: "2567-23 - PJ Dick - RKM Hall"
+    Users can search by any of these fields.
+    """
+    __tablename__ = "projects"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    project_number = Column(String, nullable=True, index=True)  # TMI ID: xxxx-YY format (e.g., "2567-23")
+    name = Column(String, nullable=False, unique=True)  # Project/site name (e.g., "RKM Hall")
+    description = Column(Text, nullable=True)
+    project_type_id = Column(String, nullable=True)  # Legacy FK to ProjectType.id; use ProjectModule for feature flags
+    status = Column(String, default="active")  # active, on_hold, completed, archived, deleted
+
+    # Data collection mode: how field data reaches Terra-View.
+    # "remote"  — units have modems; data pulled via FTP/scheduler automatically
+    # "manual"  — no modem; SD cards retrieved daily and uploaded by hand
+    data_collection_mode = Column(String, default="manual")  # remote | manual
+
+    # Project metadata
+    client_name = Column(String, nullable=True, index=True)  # Client name (e.g., "PJ Dick")
+    site_address = Column(String, nullable=True)
+    site_coordinates = Column(String, nullable=True)  # "lat,lon"
+    start_date = Column(Date, nullable=True)
+    end_date = Column(Date, nullable=True)
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    deleted_at = Column(DateTime, nullable=True)  # Set when status='deleted'; hard delete scheduled after 60 days
+
+
+class ProjectModule(Base):
+    """
+    Modules enabled on a project. Each module unlocks a set of features/tabs.
+    A project can have zero or more modules (sound_monitoring, vibration_monitoring, etc.).
+    """
+    __tablename__ = "project_modules"
+
+    id = Column(String, primary_key=True, default=lambda: __import__('uuid').uuid4().__str__())
+    project_id = Column(String, nullable=False, index=True)  # FK to projects.id
+    module_type = Column(String, nullable=False)  # sound_monitoring | vibration_monitoring | ...
+    enabled = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+    __table_args__ = (UniqueConstraint("project_id", "module_type", name="uq_project_module"),)
+
+
+class MonitoringLocation(Base):
+    """
+    Monitoring locations: generic location for monitoring activities.
+    Can be NRL (Noise Recording Location) for sound projects,
+    or monitoring point for vibration projects.
+    """
+    __tablename__ = "monitoring_locations"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    project_id = Column(String, nullable=False, index=True)  # FK to Project.id
+    location_type = Column(String, nullable=False)  # "sound" | "vibration"
+
+    name = Column(String, nullable=False)  # NRL-001, VP-North, etc.
+    description = Column(Text, nullable=True)
+    coordinates = Column(String, nullable=True)  # "lat,lon"
+    address = Column(String, nullable=True)
+
+    # Type-specific metadata stored as JSON
+    # For sound: {"ambient_conditions": "urban", "expected_sources": ["traffic"]}
+    # For vibration: {"ground_type": "bedrock", "depth": "10m"}
+    location_metadata = Column(Text, nullable=True)
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+class UnitAssignment(Base):
+    """
+    Unit assignments: links devices (SLMs or seismographs) to monitoring locations.
+    Supports temporary assignments with assigned_until.
+    """
+    __tablename__ = "unit_assignments"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    unit_id = Column(String, nullable=False, index=True)  # FK to RosterUnit.id
+    location_id = Column(String, nullable=False, index=True)  # FK to MonitoringLocation.id
+
+    assigned_at = Column(DateTime, default=datetime.utcnow)
+    assigned_until = Column(DateTime, nullable=True)  # Null = indefinite
+    status = Column(String, default="active")  # active, completed, cancelled
+    notes = Column(Text, nullable=True)
+
+    # Denormalized for efficient queries
+    device_type = Column(String, nullable=False)  # "slm" | "seismograph"
+    project_id = Column(String, nullable=False, index=True)  # FK to Project.id
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+
+class ScheduledAction(Base):
+    """
+    Scheduled actions: automation for recording start/stop/download.
+    Terra-View executes these by calling SLMM or SFM endpoints.
+    """
+    __tablename__ = "scheduled_actions"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    project_id = Column(String, nullable=False, index=True)  # FK to Project.id
+    location_id = Column(String, nullable=False, index=True)  # FK to MonitoringLocation.id
+    unit_id = Column(String, nullable=True, index=True)  # FK to RosterUnit.id (nullable if location-based)
+
+    action_type = Column(String, nullable=False)  # start, stop, download, cycle, calibrate
+    device_type = Column(String, nullable=False)  # "slm" | "seismograph"
+
+    scheduled_time = Column(DateTime, nullable=False, index=True)
+    executed_at = Column(DateTime, nullable=True)
+    execution_status = Column(String, default="pending")  # pending, completed, failed, cancelled
+
+    # Response from device module (SLMM or SFM)
+    module_response = Column(Text, nullable=True)  # JSON
+    error_message = Column(Text, nullable=True)
+
+    notes = Column(Text, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+
+class MonitoringSession(Base):
+    """
+    Monitoring sessions: tracks actual monitoring sessions.
+    Created when monitoring starts, updated when it stops.
+    """
+    __tablename__ = "monitoring_sessions"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    project_id = Column(String, nullable=False, index=True)  # FK to Project.id
+    location_id = Column(String, nullable=False, index=True)  # FK to MonitoringLocation.id
+    unit_id = Column(String, nullable=True, index=True)  # FK to RosterUnit.id (nullable for offline uploads)
+
+    # Physical device model that produced this session's data (e.g. "NL-43", "NL-53", "NL-32").
+    # Null for older records; report code falls back to file-content detection when null.
+    device_model = Column(String, nullable=True)
+
+    session_type = Column(String, nullable=False)  # sound | vibration
+    started_at = Column(DateTime, nullable=False)
+    stopped_at = Column(DateTime, nullable=True)
+    duration_seconds = Column(Integer, nullable=True)
+    status = Column(String, default="recording")  # recording, completed, failed
+
+    # Human-readable label auto-derived from date/location, editable by user.
+    # e.g. "NRL-1 — Sun 2/23 — Night"
+    session_label = Column(String, nullable=True)
+
+    # Period classification for report stats columns.
+    # weekday_day | weekday_night | weekend_day | weekend_night
+    period_type = Column(String, nullable=True)
+
+    # Effective monitoring window (hours 0–23).  Night sessions cross midnight
+    # (period_end_hour < period_start_hour).  NULL = no filtering applied.
+    # e.g.  Day: start=7, end=19   Night: start=19, end=7
+    period_start_hour = Column(Integer, nullable=True)
+    period_end_hour   = Column(Integer, nullable=True)
+
+    # For day sessions: the specific calendar date to use for report filtering.
+    # Overrides the automatic "last date with daytime rows" heuristic.
+    # Null = use heuristic.
+    report_date = Column(Date, nullable=True)
+
+    # Snapshot of device configuration at recording time
+    session_metadata = Column(Text, nullable=True)  # JSON
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+class DataFile(Base):
+    """
+    Data files: references to recorded data files.
+    Terra-View tracks file metadata; actual files stored in data/Projects/ directory.
+    """
+    __tablename__ = "data_files"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    session_id = Column(String, nullable=False, index=True)  # FK to MonitoringSession.id
+
+    file_path = Column(String, nullable=False)  # Relative to data/Projects/
+    file_type = Column(String, nullable=False)  # wav, csv, mseed, json
+    file_size_bytes = Column(Integer, nullable=True)
+    downloaded_at = Column(DateTime, nullable=True)
+    checksum = Column(String, nullable=True)  # SHA256 or MD5
+
+    # Additional file metadata
+    file_metadata = Column(Text, nullable=True)  # JSON
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+
+class ReportTemplate(Base):
+    """
+    Report templates: saved configurations for generating Excel reports.
+    Allows users to save time filter presets, titles, etc. for reuse.
+    """
+    __tablename__ = "report_templates"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    name = Column(String, nullable=False)  # "Nighttime Report", "Full Day Report"
+    project_id = Column(String, nullable=True)  # Optional: project-specific template
+
+    # Template settings
+    report_title = Column(String, default="Background Noise Study")
+    start_time = Column(String, nullable=True)  # "19:00" format
+    end_time = Column(String, nullable=True)    # "07:00" format
+    start_date = Column(String, nullable=True)  # "2025-01-15" format (optional)
+    end_date = Column(String, nullable=True)    # "2025-01-20" format (optional)
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+# ============================================================================
+# Sound Monitoring Scheduler
+# ============================================================================
+
+class RecurringSchedule(Base):
+    """
+    Recurring schedule definitions for automated sound monitoring.
+
+    Supports three schedule types:
+    - "weekly_calendar": Select specific days with start/end times (e.g., Mon/Wed/Fri 7pm-7am)
+    - "simple_interval": For 24/7 monitoring with daily stop/download/restart cycles
+    - "one_off": Single recording session with specific start and end date/time
+    """
+    __tablename__ = "recurring_schedules"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    project_id = Column(String, nullable=False, index=True)  # FK to Project.id
+    location_id = Column(String, nullable=False, index=True)  # FK to MonitoringLocation.id
+    unit_id = Column(String, nullable=True, index=True)  # FK to RosterUnit.id (optional, can use assignment)
+
+    name = Column(String, nullable=False)  # "Weeknight Monitoring", "24/7 Continuous"
+    schedule_type = Column(String, nullable=False)  # "weekly_calendar" | "simple_interval" | "one_off"
+    device_type = Column(String, nullable=False)  # "slm" | "seismograph"
+
+    # Weekly Calendar fields (schedule_type = "weekly_calendar")
+    # JSON format: {
+    #   "monday": {"enabled": true, "start": "19:00", "end": "07:00"},
+    #   "tuesday": {"enabled": false},
+    #   ...
+    # }
+    weekly_pattern = Column(Text, nullable=True)
+
+    # Simple Interval fields (schedule_type = "simple_interval")
+    interval_type = Column(String, nullable=True)  # "daily" | "hourly"
+    cycle_time = Column(String, nullable=True)  # "00:00" - time to run stop/download/restart
+    include_download = Column(Boolean, default=True)  # Download data before restart
+
+    # One-Off fields (schedule_type = "one_off")
+    start_datetime = Column(DateTime, nullable=True)  # Exact start date+time (stored as UTC)
+    end_datetime = Column(DateTime, nullable=True)    # Exact end date+time (stored as UTC)
+
+    # Automation options (applies to all schedule types)
+    auto_increment_index = Column(Boolean, default=True)  # Auto-increment store/index number before start
+    # When True: prevents "overwrite data?" prompts by using a new index each time
+
+    # Shared configuration
+    enabled = Column(Boolean, default=True)
+    timezone = Column(String, default="America/New_York")
+
+    # Tracking
+    last_generated_at = Column(DateTime, nullable=True)  # When actions were last generated
+    next_occurrence = Column(DateTime, nullable=True)  # Computed next action time
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+class Alert(Base):
+    """
+    In-app alerts for device status changes and system events.
+
+    Designed for future expansion to email/webhook notifications.
+    Currently supports:
+    - device_offline: Device became unreachable
+    - device_online: Device came back online
+    - schedule_failed: Scheduled action failed to execute
+    - schedule_completed: Scheduled action completed successfully
+    """
+    __tablename__ = "alerts"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+
+    # Alert classification
+    alert_type = Column(String, nullable=False)  # "device_offline" | "device_online" | "schedule_failed" | "schedule_completed"
+    severity = Column(String, default="warning")  # "info" | "warning" | "critical"
+
+    # Related entities (nullable - may not all apply)
+    project_id = Column(String, nullable=True, index=True)
+    location_id = Column(String, nullable=True, index=True)
+    unit_id = Column(String, nullable=True, index=True)
+    schedule_id = Column(String, nullable=True)  # RecurringSchedule or ScheduledAction id
+
+    # Alert content
+    title = Column(String, nullable=False)  # "NRL-001 Device Offline"
+    message = Column(Text, nullable=True)  # Detailed description
+    alert_metadata = Column(Text, nullable=True)  # JSON: additional context data
+
+    # Status tracking
+    status = Column(String, default="active")  # "active" | "acknowledged" | "resolved" | "dismissed"
+    acknowledged_at = Column(DateTime, nullable=True)
+    resolved_at = Column(DateTime, nullable=True)
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    expires_at = Column(DateTime, nullable=True)  # Auto-dismiss after this time
+
+
+# ============================================================================
+# Deployment Records
+# ============================================================================
+
+class DeploymentRecord(Base):
+    """
+    Deployment records: tracks each time a unit is sent to the field and returned.
+
+    Each row represents one deployment. The active deployment is the record
+    with actual_removal_date IS NULL. The fleet calendar uses this to show
+    units as "In Field" and surface their expected return date.
+
+    project_ref is a freeform string for legacy/vibration jobs like "Fay I-80".
+    project_id will be populated once those jobs are migrated to proper Project records.
+    """
+    __tablename__ = "deployment_records"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    unit_id = Column(String, nullable=False, index=True)  # FK to RosterUnit.id
+
+    deployed_date = Column(Date, nullable=True)               # When unit left the yard
+    estimated_removal_date = Column(Date, nullable=True)      # Expected return date
+    actual_removal_date = Column(Date, nullable=True)         # Filled in when returned; NULL = still out
+
+    # Project linkage: freeform for legacy jobs, FK for proper project records
+    project_ref = Column(String, nullable=True)               # e.g. "Fay I-80" (vibration jobs)
+    project_id = Column(String, nullable=True, index=True)    # FK to Project.id (when available)
+
+    location_name = Column(String, nullable=True)             # e.g. "North Gate", "VP-001"
+    notes = Column(Text, nullable=True)
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+# ============================================================================
+# Fleet Calendar & Job Reservations
+# ============================================================================
+
+class JobReservation(Base):
+    """
+    Job reservations: reserve units for future jobs/projects.
+
+    Supports two assignment modes:
+    - "specific": Pick exact units (SN-001, SN-002, etc.)
+    - "quantity": Reserve a number of units (e.g., "need 8 seismographs")
+
+    Used by the Fleet Calendar to visualize unit availability over time.
+    """
+    __tablename__ = "job_reservations"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    name = Column(String, nullable=False)  # "Job A - March deployment"
+    project_id = Column(String, nullable=True, index=True)  # Optional FK to Project
+
+    # Date range for the reservation
+    start_date = Column(Date, nullable=False)
+    end_date = Column(Date, nullable=True)  # Nullable = TBD / ongoing
+    estimated_end_date = Column(Date, nullable=True)  # For planning when end is TBD
+    end_date_tbd = Column(Boolean, default=False)  # True = end date unknown
+
+    # Assignment type: "specific" or "quantity"
+    assignment_type = Column(String, nullable=False, default="quantity")
+
+    # For quantity reservations
+    device_type = Column(String, default="seismograph")  # seismograph | slm
+    quantity_needed = Column(Integer, nullable=True)  # e.g., 8 units
+    estimated_units = Column(Integer, nullable=True)
+
+    # Full slot list as JSON: [{"location_name": "North Gate", "unit_id": null}, ...]
+    # Includes empty slots (no unit assigned yet). Filled slots are authoritative in JobReservationUnit.
+    location_slots = Column(Text, nullable=True)
+
+    # Metadata
+    notes = Column(Text, nullable=True)
+    color = Column(String, default="#3B82F6")  # For calendar display (blue default)
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+class JobReservationUnit(Base):
+    """
+    Links specific units to job reservations.
+
+    Used when:
+    - assignment_type="specific": Units are directly assigned
+    - assignment_type="quantity": Units can be filled in later
+
+    Supports unit swaps: same reservation can have multiple units with
+    different date ranges (e.g., BE17353 Feb-Jun, then BE18438 Jun-Nov).
+    """
+    __tablename__ = "job_reservation_units"
+
+    id = Column(String, primary_key=True, index=True)  # UUID
+    reservation_id = Column(String, nullable=False, index=True)  # FK to JobReservation
+    unit_id = Column(String, nullable=False, index=True)  # FK to RosterUnit
+
+    # Unit-specific date range (for swaps) - defaults to reservation dates if null
+    unit_start_date = Column(Date, nullable=True)  # When this specific unit starts
+    unit_end_date = Column(Date, nullable=True)  # When this unit ends (swap out date)
+    unit_end_tbd = Column(Boolean, default=False)  # True = end unknown (until cal expires or job ends)
+
+    # Track how this assignment was made
+    assignment_source = Column(String, default="specific")  # "specific" | "filled" | "swap"
+    assigned_at = Column(DateTime, default=datetime.utcnow)
+    notes = Column(Text, nullable=True)  # "Replacing BE17353" etc.
+
+    # Power requirements for this deployment slot
+    power_type = Column(String, nullable=True)  # "ac" | "solar" | None
+
+    # Location identity
+    location_name = Column(String, nullable=True)  # e.g. "North Gate", "Main Entrance"
+    slot_index = Column(Integer, nullable=True)     # Order within reservation (0-based)

backend/routers/activity.py

@@ -0,0 +1,146 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+from sqlalchemy import desc
+from pathlib import Path
+from datetime import datetime, timedelta, timezone
+from typing import List, Dict, Any
+from backend.database import get_db
+from backend.models import UnitHistory, Emitter, RosterUnit
+
+router = APIRouter(prefix="/api", tags=["activity"])
+
+PHOTOS_BASE_DIR = Path("data/photos")
+
+
+@router.get("/recent-activity")
+def get_recent_activity(limit: int = 20, db: Session = Depends(get_db)):
+    """
+    Get recent activity feed combining unit history changes and photo uploads.
+    Returns a unified timeline of events sorted by timestamp (newest first).
+    """
+    activities = []
+
+    # Get recent history entries
+    history_entries = db.query(UnitHistory)\
+        .order_by(desc(UnitHistory.changed_at))\
+        .limit(limit * 2)\
+        .all()  # Get more than needed to mix with photos
+
+    for entry in history_entries:
+        activity = {
+            "type": "history",
+            "timestamp": entry.changed_at.isoformat(),
+            "timestamp_unix": entry.changed_at.timestamp(),
+            "unit_id": entry.unit_id,
+            "change_type": entry.change_type,
+            "field_name": entry.field_name,
+            "old_value": entry.old_value,
+            "new_value": entry.new_value,
+            "source": entry.source,
+            "notes": entry.notes
+        }
+        activities.append(activity)
+
+    # Get recent photos
+    if PHOTOS_BASE_DIR.exists():
+        image_extensions = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
+        photo_activities = []
+
+        for unit_dir in PHOTOS_BASE_DIR.iterdir():
+            if not unit_dir.is_dir():
+                continue
+
+            unit_id = unit_dir.name
+
+            for file_path in unit_dir.iterdir():
+                if file_path.is_file() and file_path.suffix.lower() in image_extensions:
+                    modified_time = file_path.stat().st_mtime
+                    photo_activities.append({
+                        "type": "photo",
+                        "timestamp": datetime.fromtimestamp(modified_time).isoformat(),
+                        "timestamp_unix": modified_time,
+                        "unit_id": unit_id,
+                        "filename": file_path.name,
+                        "photo_url": f"/api/unit/{unit_id}/photo/{file_path.name}"
+                    })
+
+        activities.extend(photo_activities)
+
+    # Sort all activities by timestamp (newest first)
+    activities.sort(key=lambda x: x["timestamp_unix"], reverse=True)
+
+    # Limit to requested number
+    activities = activities[:limit]
+
+    return {
+        "activities": activities,
+        "total": len(activities)
+    }
+
+
+@router.get("/recent-callins")
+def get_recent_callins(hours: int = 6, limit: int = None, db: Session = Depends(get_db)):
+    """
+    Get recent unit call-ins (units that have reported recently).
+    Returns units sorted by most recent last_seen timestamp.
+
+    Args:
+        hours: Look back this many hours (default: 6)
+        limit: Maximum number of results (default: None = all)
+    """
+    # Calculate the time threshold
+    time_threshold = datetime.now(timezone.utc) - timedelta(hours=hours)
+
+    # Query emitters with recent activity, joined with roster info
+    recent_emitters = db.query(Emitter)\
+        .filter(Emitter.last_seen >= time_threshold)\
+        .order_by(desc(Emitter.last_seen))\
+        .all()
+
+    # Get roster info for all units
+    roster_dict = {r.id: r for r in db.query(RosterUnit).all()}
+
+    call_ins = []
+    for emitter in recent_emitters:
+        roster_unit = roster_dict.get(emitter.id)
+
+        # Calculate time since last seen
+        last_seen_utc = emitter.last_seen.replace(tzinfo=timezone.utc) if emitter.last_seen.tzinfo is None else emitter.last_seen
+        time_diff = datetime.now(timezone.utc) - last_seen_utc
+
+        # Format time ago
+        if time_diff.total_seconds() < 60:
+            time_ago = "just now"
+        elif time_diff.total_seconds() < 3600:
+            minutes = int(time_diff.total_seconds() / 60)
+            time_ago = f"{minutes}m ago"
+        else:
+            hours_ago = time_diff.total_seconds() / 3600
+            if hours_ago < 24:
+                time_ago = f"{int(hours_ago)}h {int((hours_ago % 1) * 60)}m ago"
+            else:
+                days = int(hours_ago / 24)
+                time_ago = f"{days}d ago"
+
+        call_in = {
+            "unit_id": emitter.id,
+            "last_seen": emitter.last_seen.isoformat(),
+            "time_ago": time_ago,
+            "status": emitter.status,
+            "device_type": roster_unit.device_type if roster_unit else "seismograph",
+            "deployed": roster_unit.deployed if roster_unit else False,
+            "note": roster_unit.note if roster_unit and roster_unit.note else "",
+            "location": roster_unit.address if roster_unit and roster_unit.address else (roster_unit.location if roster_unit else "")
+        }
+        call_ins.append(call_in)
+
+    # Apply limit if specified
+    if limit:
+        call_ins = call_ins[:limit]
+
+    return {
+        "call_ins": call_ins,
+        "total": len(call_ins),
+        "hours": hours,
+        "time_threshold": time_threshold.isoformat()
+    }

backend/routers/alerts.py

@@ -0,0 +1,326 @@
+"""
+Alerts Router
+
+API endpoints for managing in-app alerts.
+"""
+
+from fastapi import APIRouter, Request, Depends, HTTPException, Query
+from fastapi.responses import HTMLResponse, JSONResponse
+from sqlalchemy.orm import Session
+from typing import Optional
+from datetime import datetime, timedelta
+
+from backend.database import get_db
+from backend.models import Alert, RosterUnit
+from backend.services.alert_service import get_alert_service
+from backend.templates_config import templates
+
+router = APIRouter(prefix="/api/alerts", tags=["alerts"])
+
+
+# ============================================================================
+# Alert List and Count
+# ============================================================================
+
+@router.get("/")
+async def list_alerts(
+    db: Session = Depends(get_db),
+    status: Optional[str] = Query(None, description="Filter by status: active, acknowledged, resolved, dismissed"),
+    project_id: Optional[str] = Query(None),
+    unit_id: Optional[str] = Query(None),
+    alert_type: Optional[str] = Query(None, description="Filter by type: device_offline, device_online, schedule_failed"),
+    limit: int = Query(50, le=100),
+    offset: int = Query(0, ge=0),
+):
+    """
+    List alerts with optional filters.
+    """
+    alert_service = get_alert_service(db)
+
+    alerts = alert_service.get_all_alerts(
+        status=status,
+        project_id=project_id,
+        unit_id=unit_id,
+        alert_type=alert_type,
+        limit=limit,
+        offset=offset,
+    )
+
+    return {
+        "alerts": [
+            {
+                "id": a.id,
+                "alert_type": a.alert_type,
+                "severity": a.severity,
+                "title": a.title,
+                "message": a.message,
+                "status": a.status,
+                "unit_id": a.unit_id,
+                "project_id": a.project_id,
+                "location_id": a.location_id,
+                "created_at": a.created_at.isoformat() if a.created_at else None,
+                "acknowledged_at": a.acknowledged_at.isoformat() if a.acknowledged_at else None,
+                "resolved_at": a.resolved_at.isoformat() if a.resolved_at else None,
+            }
+            for a in alerts
+        ],
+        "count": len(alerts),
+        "limit": limit,
+        "offset": offset,
+    }
+
+
+@router.get("/active")
+async def list_active_alerts(
+    db: Session = Depends(get_db),
+    project_id: Optional[str] = Query(None),
+    unit_id: Optional[str] = Query(None),
+    alert_type: Optional[str] = Query(None),
+    min_severity: Optional[str] = Query(None, description="Minimum severity: info, warning, critical"),
+    limit: int = Query(50, le=100),
+):
+    """
+    List only active alerts.
+    """
+    alert_service = get_alert_service(db)
+
+    alerts = alert_service.get_active_alerts(
+        project_id=project_id,
+        unit_id=unit_id,
+        alert_type=alert_type,
+        min_severity=min_severity,
+        limit=limit,
+    )
+
+    return {
+        "alerts": [
+            {
+                "id": a.id,
+                "alert_type": a.alert_type,
+                "severity": a.severity,
+                "title": a.title,
+                "message": a.message,
+                "unit_id": a.unit_id,
+                "project_id": a.project_id,
+                "created_at": a.created_at.isoformat() if a.created_at else None,
+            }
+            for a in alerts
+        ],
+        "count": len(alerts),
+    }
+
+
+@router.get("/active/count")
+async def get_active_alert_count(db: Session = Depends(get_db)):
+    """
+    Get count of active alerts (for navbar badge).
+    """
+    alert_service = get_alert_service(db)
+    count = alert_service.get_active_alert_count()
+    return {"count": count}
+
+
+# ============================================================================
+# Single Alert Operations
+# ============================================================================
+
+@router.get("/{alert_id}")
+async def get_alert(
+    alert_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Get a specific alert.
+    """
+    alert = db.query(Alert).filter_by(id=alert_id).first()
+    if not alert:
+        raise HTTPException(status_code=404, detail="Alert not found")
+
+    # Get related unit info
+    unit = None
+    if alert.unit_id:
+        unit = db.query(RosterUnit).filter_by(id=alert.unit_id).first()
+
+    return {
+        "id": alert.id,
+        "alert_type": alert.alert_type,
+        "severity": alert.severity,
+        "title": alert.title,
+        "message": alert.message,
+        "metadata": alert.alert_metadata,
+        "status": alert.status,
+        "unit_id": alert.unit_id,
+        "unit_name": unit.id if unit else None,
+        "project_id": alert.project_id,
+        "location_id": alert.location_id,
+        "schedule_id": alert.schedule_id,
+        "created_at": alert.created_at.isoformat() if alert.created_at else None,
+        "acknowledged_at": alert.acknowledged_at.isoformat() if alert.acknowledged_at else None,
+        "resolved_at": alert.resolved_at.isoformat() if alert.resolved_at else None,
+        "expires_at": alert.expires_at.isoformat() if alert.expires_at else None,
+    }
+
+
+@router.post("/{alert_id}/acknowledge")
+async def acknowledge_alert(
+    alert_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Mark alert as acknowledged.
+    """
+    alert_service = get_alert_service(db)
+    alert = alert_service.acknowledge_alert(alert_id)
+
+    if not alert:
+        raise HTTPException(status_code=404, detail="Alert not found")
+
+    return {
+        "success": True,
+        "alert_id": alert.id,
+        "status": alert.status,
+    }
+
+
+@router.post("/{alert_id}/dismiss")
+async def dismiss_alert(
+    alert_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Dismiss alert.
+    """
+    alert_service = get_alert_service(db)
+    alert = alert_service.dismiss_alert(alert_id)
+
+    if not alert:
+        raise HTTPException(status_code=404, detail="Alert not found")
+
+    return {
+        "success": True,
+        "alert_id": alert.id,
+        "status": alert.status,
+    }
+
+
+@router.post("/{alert_id}/resolve")
+async def resolve_alert(
+    alert_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Manually resolve an alert.
+    """
+    alert_service = get_alert_service(db)
+    alert = alert_service.resolve_alert(alert_id)
+
+    if not alert:
+        raise HTTPException(status_code=404, detail="Alert not found")
+
+    return {
+        "success": True,
+        "alert_id": alert.id,
+        "status": alert.status,
+    }
+
+
+# ============================================================================
+# HTML Partials for HTMX
+# ============================================================================
+
+@router.get("/partials/dropdown", response_class=HTMLResponse)
+async def get_alert_dropdown(
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    """
+    Return HTML partial for alert dropdown in navbar.
+    """
+    alert_service = get_alert_service(db)
+    alerts = alert_service.get_active_alerts(limit=10)
+
+    # Calculate relative time for each alert
+    now = datetime.utcnow()
+    alerts_data = []
+    for alert in alerts:
+        delta = now - alert.created_at
+        if delta.days > 0:
+            time_ago = f"{delta.days}d ago"
+        elif delta.seconds >= 3600:
+            time_ago = f"{delta.seconds // 3600}h ago"
+        elif delta.seconds >= 60:
+            time_ago = f"{delta.seconds // 60}m ago"
+        else:
+            time_ago = "just now"
+
+        alerts_data.append({
+            "alert": alert,
+            "time_ago": time_ago,
+        })
+
+    return templates.TemplateResponse("partials/alerts/alert_dropdown.html", {
+        "request": request,
+        "alerts": alerts_data,
+        "total_count": alert_service.get_active_alert_count(),
+    })
+
+
+@router.get("/partials/list", response_class=HTMLResponse)
+async def get_alert_list(
+    request: Request,
+    db: Session = Depends(get_db),
+    status: Optional[str] = Query(None),
+    limit: int = Query(20),
+):
+    """
+    Return HTML partial for alert list page.
+    """
+    alert_service = get_alert_service(db)
+
+    if status:
+        alerts = alert_service.get_all_alerts(status=status, limit=limit)
+    else:
+        alerts = alert_service.get_all_alerts(limit=limit)
+
+    # Calculate relative time for each alert
+    now = datetime.utcnow()
+    alerts_data = []
+    for alert in alerts:
+        delta = now - alert.created_at
+        if delta.days > 0:
+            time_ago = f"{delta.days}d ago"
+        elif delta.seconds >= 3600:
+            time_ago = f"{delta.seconds // 3600}h ago"
+        elif delta.seconds >= 60:
+            time_ago = f"{delta.seconds // 60}m ago"
+        else:
+            time_ago = "just now"
+
+        alerts_data.append({
+            "alert": alert,
+            "time_ago": time_ago,
+        })
+
+    return templates.TemplateResponse("partials/alerts/alert_list.html", {
+        "request": request,
+        "alerts": alerts_data,
+        "status_filter": status,
+    })
+
+
+# ============================================================================
+# Cleanup
+# ============================================================================
+
+@router.post("/cleanup-expired")
+async def cleanup_expired_alerts(db: Session = Depends(get_db)):
+    """
+    Cleanup expired alerts (admin/maintenance endpoint).
+    """
+    alert_service = get_alert_service(db)
+    count = alert_service.cleanup_expired_alerts()
+
+    return {
+        "success": True,
+        "cleaned_up": count,
+    }

backend/routers/dashboard.py

@@ -0,0 +1,106 @@
+from fastapi import APIRouter, Request, Depends
+from sqlalchemy.orm import Session
+from sqlalchemy import and_
+from datetime import datetime, timedelta
+
+from backend.database import get_db
+from backend.models import ScheduledAction, MonitoringLocation, Project
+from backend.services.snapshot import emit_status_snapshot
+from backend.templates_config import templates
+from backend.utils.timezone import utc_to_local, local_to_utc, get_user_timezone
+
+router = APIRouter()
+
+
+@router.get("/dashboard/active")
+def dashboard_active(request: Request):
+    snapshot = emit_status_snapshot()
+    return templates.TemplateResponse(
+        "partials/active_table.html",
+        {"request": request, "units": snapshot["active"]}
+    )
+
+
+@router.get("/dashboard/benched")
+def dashboard_benched(request: Request):
+    snapshot = emit_status_snapshot()
+    return templates.TemplateResponse(
+        "partials/benched_table.html",
+        {"request": request, "units": snapshot["benched"]}
+    )
+
+
+@router.get("/dashboard/todays-actions")
+def dashboard_todays_actions(request: Request, db: Session = Depends(get_db)):
+    """
+    Get today's scheduled actions for the dashboard card.
+    Shows upcoming, completed, and failed actions for today.
+    """
+    import json
+    from zoneinfo import ZoneInfo
+
+    # Get today's date range in local timezone
+    tz = ZoneInfo(get_user_timezone())
+    now_local = datetime.now(tz)
+    today_start_local = now_local.replace(hour=0, minute=0, second=0, microsecond=0)
+    today_end_local = today_start_local + timedelta(days=1)
+
+    # Convert to UTC for database query
+    today_start_utc = today_start_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+    today_end_utc = today_end_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+
+    # Exclude actions from paused/removed projects
+    paused_project_ids = [
+        p.id for p in db.query(Project.id).filter(
+            Project.status.in_(["on_hold", "archived", "deleted"])
+        ).all()
+    ]
+
+    # Query today's actions
+    actions = db.query(ScheduledAction).filter(
+        ScheduledAction.scheduled_time >= today_start_utc,
+        ScheduledAction.scheduled_time < today_end_utc,
+        ScheduledAction.project_id.notin_(paused_project_ids),
+    ).order_by(ScheduledAction.scheduled_time.asc()).all()
+
+    # Enrich with location/project info and parse results
+    enriched_actions = []
+    for action in actions:
+        location = None
+        project = None
+        if action.location_id:
+            location = db.query(MonitoringLocation).filter_by(id=action.location_id).first()
+        if action.project_id:
+            project = db.query(Project).filter_by(id=action.project_id).first()
+
+        # Parse module_response for result details
+        result_data = None
+        if action.module_response:
+            try:
+                result_data = json.loads(action.module_response)
+            except json.JSONDecodeError:
+                pass
+
+        enriched_actions.append({
+            "action": action,
+            "location": location,
+            "project": project,
+            "result": result_data,
+        })
+
+    # Count by status
+    pending_count = sum(1 for a in actions if a.execution_status == "pending")
+    completed_count = sum(1 for a in actions if a.execution_status == "completed")
+    failed_count = sum(1 for a in actions if a.execution_status == "failed")
+
+    return templates.TemplateResponse(
+        "partials/dashboard/todays_actions.html",
+        {
+            "request": request,
+            "actions": enriched_actions,
+            "pending_count": pending_count,
+            "completed_count": completed_count,
+            "failed_count": failed_count,
+            "total_count": len(actions),
+        }
+    )

backend/routers/dashboard_tabs.py

@@ -0,0 +1,34 @@
+# backend/routers/dashboard_tabs.py
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from backend.database import get_db
+from backend.services.snapshot import emit_status_snapshot
+
+router = APIRouter(prefix="/dashboard", tags=["dashboard-tabs"])
+
+@router.get("/active")
+def get_active_units(db: Session = Depends(get_db)):
+    """
+    Return only ACTIVE (deployed) units for dashboard table swap.
+    """
+    snap = emit_status_snapshot()
+    units = {
+        uid: u
+        for uid, u in snap["units"].items()
+        if u["deployed"] is True
+    }
+    return {"units": units}
+
+@router.get("/benched")
+def get_benched_units(db: Session = Depends(get_db)):
+    """
+    Return only BENCHED (not deployed) units for dashboard table swap.
+    """
+    snap = emit_status_snapshot()
+    units = {
+        uid: u
+        for uid, u in snap["units"].items()
+        if u["deployed"] is False
+    }
+    return {"units": units}

backend/routers/deployments.py

@@ -0,0 +1,154 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from datetime import datetime, date
+from typing import Optional
+import uuid
+
+from backend.database import get_db
+from backend.models import DeploymentRecord, RosterUnit
+
+router = APIRouter(prefix="/api", tags=["deployments"])
+
+
+def _serialize(record: DeploymentRecord) -> dict:
+    return {
+        "id": record.id,
+        "unit_id": record.unit_id,
+        "deployed_date": record.deployed_date.isoformat() if record.deployed_date else None,
+        "estimated_removal_date": record.estimated_removal_date.isoformat() if record.estimated_removal_date else None,
+        "actual_removal_date": record.actual_removal_date.isoformat() if record.actual_removal_date else None,
+        "project_ref": record.project_ref,
+        "project_id": record.project_id,
+        "location_name": record.location_name,
+        "notes": record.notes,
+        "created_at": record.created_at.isoformat() if record.created_at else None,
+        "updated_at": record.updated_at.isoformat() if record.updated_at else None,
+        "is_active": record.actual_removal_date is None,
+    }
+
+
+@router.get("/deployments/{unit_id}")
+def get_deployments(unit_id: str, db: Session = Depends(get_db)):
+    """Get all deployment records for a unit, newest first."""
+    unit = db.query(RosterUnit).filter_by(id=unit_id).first()
+    if not unit:
+        raise HTTPException(status_code=404, detail=f"Unit {unit_id} not found")
+
+    records = (
+        db.query(DeploymentRecord)
+        .filter_by(unit_id=unit_id)
+        .order_by(DeploymentRecord.deployed_date.desc(), DeploymentRecord.created_at.desc())
+        .all()
+    )
+    return {"deployments": [_serialize(r) for r in records]}
+
+
+@router.get("/deployments/{unit_id}/active")
+def get_active_deployment(unit_id: str, db: Session = Depends(get_db)):
+    """Get the current active deployment (actual_removal_date is NULL), or null."""
+    record = (
+        db.query(DeploymentRecord)
+        .filter(
+            DeploymentRecord.unit_id == unit_id,
+            DeploymentRecord.actual_removal_date == None
+        )
+        .order_by(DeploymentRecord.created_at.desc())
+        .first()
+    )
+    return {"deployment": _serialize(record) if record else None}
+
+
+@router.post("/deployments/{unit_id}")
+def create_deployment(unit_id: str, payload: dict, db: Session = Depends(get_db)):
+    """
+    Create a new deployment record for a unit.
+
+    Body fields (all optional):
+        deployed_date         (YYYY-MM-DD)
+        estimated_removal_date (YYYY-MM-DD)
+        project_ref           (freeform string)
+        project_id            (UUID if linked to Project)
+        location_name
+        notes
+    """
+    unit = db.query(RosterUnit).filter_by(id=unit_id).first()
+    if not unit:
+        raise HTTPException(status_code=404, detail=f"Unit {unit_id} not found")
+
+    def parse_date(val) -> Optional[date]:
+        if not val:
+            return None
+        if isinstance(val, date):
+            return val
+        return date.fromisoformat(str(val))
+
+    record = DeploymentRecord(
+        id=str(uuid.uuid4()),
+        unit_id=unit_id,
+        deployed_date=parse_date(payload.get("deployed_date")),
+        estimated_removal_date=parse_date(payload.get("estimated_removal_date")),
+        actual_removal_date=None,
+        project_ref=payload.get("project_ref"),
+        project_id=payload.get("project_id"),
+        location_name=payload.get("location_name"),
+        notes=payload.get("notes"),
+        created_at=datetime.utcnow(),
+        updated_at=datetime.utcnow(),
+    )
+    db.add(record)
+    db.commit()
+    db.refresh(record)
+    return _serialize(record)
+
+
+@router.put("/deployments/{unit_id}/{deployment_id}")
+def update_deployment(unit_id: str, deployment_id: str, payload: dict, db: Session = Depends(get_db)):
+    """
+    Update a deployment record. Used for:
+    - Setting/changing estimated_removal_date
+    - Closing a deployment (set actual_removal_date to mark unit returned)
+    - Editing project_ref, location_name, notes
+    """
+    record = db.query(DeploymentRecord).filter_by(id=deployment_id, unit_id=unit_id).first()
+    if not record:
+        raise HTTPException(status_code=404, detail="Deployment record not found")
+
+    def parse_date(val) -> Optional[date]:
+        if val is None:
+            return None
+        if val == "":
+            return None
+        if isinstance(val, date):
+            return val
+        return date.fromisoformat(str(val))
+
+    if "deployed_date" in payload:
+        record.deployed_date = parse_date(payload["deployed_date"])
+    if "estimated_removal_date" in payload:
+        record.estimated_removal_date = parse_date(payload["estimated_removal_date"])
+    if "actual_removal_date" in payload:
+        record.actual_removal_date = parse_date(payload["actual_removal_date"])
+    if "project_ref" in payload:
+        record.project_ref = payload["project_ref"]
+    if "project_id" in payload:
+        record.project_id = payload["project_id"]
+    if "location_name" in payload:
+        record.location_name = payload["location_name"]
+    if "notes" in payload:
+        record.notes = payload["notes"]
+
+    record.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(record)
+    return _serialize(record)
+
+
+@router.delete("/deployments/{unit_id}/{deployment_id}")
+def delete_deployment(unit_id: str, deployment_id: str, db: Session = Depends(get_db)):
+    """Delete a deployment record."""
+    record = db.query(DeploymentRecord).filter_by(id=deployment_id, unit_id=unit_id).first()
+    if not record:
+        raise HTTPException(status_code=404, detail="Deployment record not found")
+    db.delete(record)
+    db.commit()
+    return {"ok": True}

backend/routers/fleet_calendar.py

@@ -0,0 +1,928 @@
+"""
+Fleet Calendar Router
+
+API endpoints for the Fleet Calendar feature:
+- Calendar page and data
+- Job reservation CRUD
+- Unit assignment management
+- Availability checking
+"""
+
+from fastapi import APIRouter, Request, Depends, HTTPException, Query
+from fastapi.responses import HTMLResponse, JSONResponse
+from sqlalchemy.orm import Session
+from datetime import datetime, date, timedelta
+from typing import Optional, List
+import uuid
+import logging
+
+from backend.database import get_db
+from backend.models import (
+    RosterUnit, JobReservation, JobReservationUnit,
+    UserPreferences, Project, MonitoringLocation, UnitAssignment
+)
+from backend.templates_config import templates
+from backend.services.fleet_calendar_service import (
+    get_day_summary,
+    get_calendar_year_data,
+    get_rolling_calendar_data,
+    check_calibration_conflicts,
+    get_available_units_for_period,
+    get_calibration_status
+)
+
+router = APIRouter(tags=["fleet-calendar"])
+logger = logging.getLogger(__name__)
+
+
+# ============================================================================
+# Calendar Page
+# ============================================================================
+
+@router.get("/fleet-calendar", response_class=HTMLResponse)
+async def fleet_calendar_page(
+    request: Request,
+    year: Optional[int] = None,
+    month: Optional[int] = None,
+    device_type: str = "seismograph",
+    db: Session = Depends(get_db)
+):
+    """Main Fleet Calendar page with rolling 12-month view."""
+    today = date.today()
+
+    # Default to current month as the start
+    if year is None:
+        year = today.year
+    if month is None:
+        month = today.month
+
+    # Get calendar data for 12 months starting from year/month
+    calendar_data = get_rolling_calendar_data(db, year, month, device_type)
+
+    # Get projects for the reservation form dropdown
+    projects = db.query(Project).filter(
+        Project.status.in_(["active", "upcoming", "on_hold"])
+    ).order_by(Project.name).all()
+
+    # Build a serializable list of items with dates for calendar bars
+    # Includes both tracked Projects (with dates) and Job Reservations (matching device_type)
+    project_colors = ['#3B82F6', '#10B981', '#F59E0B', '#EF4444', '#8B5CF6', '#EC4899', '#06B6D4', '#F97316']
+    # Map calendar device_type to project_type_ids
+    device_type_to_project_types = {
+        "seismograph": ["vibration_monitoring", "combined"],
+        "slm": ["sound_monitoring", "combined"],
+    }
+    relevant_project_types = device_type_to_project_types.get(device_type, [])
+
+    calendar_projects = []
+    for i, p in enumerate(projects):
+        if p.start_date and p.project_type_id in relevant_project_types:
+            calendar_projects.append({
+                "id": p.id,
+                "name": p.name,
+                "start_date": p.start_date.isoformat(),
+                "end_date": p.end_date.isoformat() if p.end_date else None,
+                "color": project_colors[i % len(project_colors)],
+                "confirmed": True,
+            })
+
+    # Add job reservations for this device_type as bars
+    from sqlalchemy import or_ as _or
+    cal_window_end = date(year + ((month + 10) // 12), ((month + 10) % 12) + 1, 1)
+    reservations_for_cal = db.query(JobReservation).filter(
+        JobReservation.device_type == device_type,
+        JobReservation.start_date <= cal_window_end,
+        _or(
+            JobReservation.end_date >= date(year, month, 1),
+            JobReservation.end_date == None,
+        )
+    ).all()
+    for res in reservations_for_cal:
+        end = res.end_date or res.estimated_end_date
+        calendar_projects.append({
+            "id": res.id,
+            "name": res.name,
+            "start_date": res.start_date.isoformat(),
+            "end_date": end.isoformat() if end else None,
+            "color": res.color,
+            "confirmed": bool(res.project_id),
+        })
+
+    # Calculate prev/next month navigation
+    prev_year, prev_month = (year - 1, 12) if month == 1 else (year, month - 1)
+    next_year, next_month = (year + 1, 1) if month == 12 else (year, month + 1)
+
+    return templates.TemplateResponse(
+        "fleet_calendar.html",
+        {
+            "request": request,
+            "start_year": year,
+            "start_month": month,
+            "prev_year": prev_year,
+            "prev_month": prev_month,
+            "next_year": next_year,
+            "next_month": next_month,
+            "device_type": device_type,
+            "calendar_data": calendar_data,
+            "projects": projects,
+            "calendar_projects": calendar_projects,
+            "today": today.isoformat()
+        }
+    )
+
+
+# ============================================================================
+# Calendar Data API
+# ============================================================================
+
+@router.get("/api/fleet-calendar/data", response_class=JSONResponse)
+async def get_calendar_data(
+    year: int,
+    device_type: str = "seismograph",
+    db: Session = Depends(get_db)
+):
+    """Get calendar data for a specific year."""
+    return get_calendar_year_data(db, year, device_type)
+
+
+@router.get("/api/fleet-calendar/day/{date_str}", response_class=HTMLResponse)
+async def get_day_detail(
+    request: Request,
+    date_str: str,
+    device_type: str = "seismograph",
+    db: Session = Depends(get_db)
+):
+    """Get detailed view for a specific day (HTMX partial)."""
+    try:
+        check_date = date.fromisoformat(date_str)
+    except ValueError:
+        raise HTTPException(status_code=400, detail="Invalid date format. Use YYYY-MM-DD")
+
+    day_data = get_day_summary(db, check_date, device_type)
+
+    # Get projects for display names
+    projects = {p.id: p for p in db.query(Project).all()}
+
+    return templates.TemplateResponse(
+        "partials/fleet_calendar/day_detail.html",
+        {
+            "request": request,
+            "day_data": day_data,
+            "date_str": date_str,
+            "date_display": check_date.strftime("%B %d, %Y"),
+            "device_type": device_type,
+            "projects": projects
+        }
+    )
+
+
+# ============================================================================
+# Reservation CRUD
+# ============================================================================
+
+@router.post("/api/fleet-calendar/reservations", response_class=JSONResponse)
+async def create_reservation(
+    request: Request,
+    db: Session = Depends(get_db)
+):
+    """Create a new job reservation."""
+    data = await request.json()
+
+    # Validate required fields
+    required = ["name", "start_date", "assignment_type"]
+    for field in required:
+        if field not in data:
+            raise HTTPException(status_code=400, detail=f"Missing required field: {field}")
+
+    # Need either end_date or end_date_tbd
+    end_date_tbd = data.get("end_date_tbd", False)
+    if not end_date_tbd and not data.get("end_date"):
+        raise HTTPException(status_code=400, detail="End date is required unless marked as TBD")
+
+    try:
+        start_date = date.fromisoformat(data["start_date"])
+        end_date = date.fromisoformat(data["end_date"]) if data.get("end_date") else None
+        estimated_end_date = date.fromisoformat(data["estimated_end_date"]) if data.get("estimated_end_date") else None
+    except ValueError:
+        raise HTTPException(status_code=400, detail="Invalid date format. Use YYYY-MM-DD")
+
+    if end_date and end_date < start_date:
+        raise HTTPException(status_code=400, detail="End date must be after start date")
+
+    if estimated_end_date and estimated_end_date < start_date:
+        raise HTTPException(status_code=400, detail="Estimated end date must be after start date")
+
+    import json as _json
+    reservation = JobReservation(
+        id=str(uuid.uuid4()),
+        name=data["name"],
+        project_id=data.get("project_id"),
+        start_date=start_date,
+        end_date=end_date,
+        estimated_end_date=estimated_end_date,
+        end_date_tbd=end_date_tbd,
+        assignment_type=data["assignment_type"],
+        device_type=data.get("device_type", "seismograph"),
+        quantity_needed=data.get("quantity_needed"),
+        estimated_units=data.get("estimated_units"),
+        location_slots=_json.dumps(data["location_slots"]) if data.get("location_slots") is not None else None,
+        notes=data.get("notes"),
+        color=data.get("color", "#3B82F6")
+    )
+
+    db.add(reservation)
+
+    # If specific units were provided, assign them
+    if data.get("unit_ids") and data["assignment_type"] == "specific":
+        for unit_id in data["unit_ids"]:
+            assignment = JobReservationUnit(
+                id=str(uuid.uuid4()),
+                reservation_id=reservation.id,
+                unit_id=unit_id,
+                assignment_source="specific"
+            )
+            db.add(assignment)
+
+    db.commit()
+
+    logger.info(f"Created reservation: {reservation.name} ({reservation.id})")
+
+    return {
+        "success": True,
+        "reservation_id": reservation.id,
+        "message": f"Created reservation: {reservation.name}"
+    }
+
+
+@router.get("/api/fleet-calendar/reservations/{reservation_id}", response_class=JSONResponse)
+async def get_reservation(
+    reservation_id: str,
+    db: Session = Depends(get_db)
+):
+    """Get a specific reservation with its assigned units."""
+    reservation = db.query(JobReservation).filter_by(id=reservation_id).first()
+    if not reservation:
+        raise HTTPException(status_code=404, detail="Reservation not found")
+
+    # Get assigned units
+    assignments = db.query(JobReservationUnit).filter_by(
+        reservation_id=reservation_id
+    ).all()
+
+    # Sort assignments by slot_index so order is preserved
+    assignments_sorted = sorted(assignments, key=lambda a: (a.slot_index if a.slot_index is not None else 999))
+    unit_ids = [a.unit_id for a in assignments_sorted]
+    units = db.query(RosterUnit).filter(RosterUnit.id.in_(unit_ids)).all() if unit_ids else []
+    units_by_id = {u.id: u for u in units}
+    # Build per-unit lookups from assignments
+    assignment_map = {a.unit_id: a for a in assignments_sorted}
+
+    import json as _json
+    stored_slots = _json.loads(reservation.location_slots) if reservation.location_slots else None
+
+    return {
+        "id": reservation.id,
+        "name": reservation.name,
+        "project_id": reservation.project_id,
+        "start_date": reservation.start_date.isoformat(),
+        "end_date": reservation.end_date.isoformat() if reservation.end_date else None,
+        "estimated_end_date": reservation.estimated_end_date.isoformat() if reservation.estimated_end_date else None,
+        "end_date_tbd": reservation.end_date_tbd,
+        "assignment_type": reservation.assignment_type,
+        "device_type": reservation.device_type,
+        "quantity_needed": reservation.quantity_needed,
+        "estimated_units": reservation.estimated_units,
+        "location_slots": stored_slots,
+        "notes": reservation.notes,
+        "color": reservation.color,
+        "assigned_units": [
+            {
+                "id": uid,
+                "last_calibrated": units_by_id[uid].last_calibrated.isoformat() if uid in units_by_id and units_by_id[uid].last_calibrated else None,
+                "deployed": units_by_id[uid].deployed if uid in units_by_id else False,
+                "power_type": assignment_map[uid].power_type,
+                "notes": assignment_map[uid].notes,
+                "location_name": assignment_map[uid].location_name,
+                "slot_index": assignment_map[uid].slot_index,
+            }
+            for uid in unit_ids
+        ]
+    }
+
+
+@router.put("/api/fleet-calendar/reservations/{reservation_id}", response_class=JSONResponse)
+async def update_reservation(
+    reservation_id: str,
+    request: Request,
+    db: Session = Depends(get_db)
+):
+    """Update an existing reservation."""
+    reservation = db.query(JobReservation).filter_by(id=reservation_id).first()
+    if not reservation:
+        raise HTTPException(status_code=404, detail="Reservation not found")
+
+    data = await request.json()
+
+    # Update fields if provided
+    if "name" in data:
+        reservation.name = data["name"]
+    if "project_id" in data:
+        reservation.project_id = data["project_id"]
+    if "start_date" in data:
+        reservation.start_date = date.fromisoformat(data["start_date"])
+    if "end_date" in data:
+        reservation.end_date = date.fromisoformat(data["end_date"]) if data["end_date"] else None
+    if "estimated_end_date" in data:
+        reservation.estimated_end_date = date.fromisoformat(data["estimated_end_date"]) if data["estimated_end_date"] else None
+    if "end_date_tbd" in data:
+        reservation.end_date_tbd = data["end_date_tbd"]
+    if "assignment_type" in data:
+        reservation.assignment_type = data["assignment_type"]
+    if "quantity_needed" in data:
+        reservation.quantity_needed = data["quantity_needed"]
+    if "estimated_units" in data:
+        reservation.estimated_units = data["estimated_units"]
+    if "location_slots" in data:
+        import json as _json
+        reservation.location_slots = _json.dumps(data["location_slots"]) if data["location_slots"] is not None else None
+    if "notes" in data:
+        reservation.notes = data["notes"]
+    if "color" in data:
+        reservation.color = data["color"]
+
+    reservation.updated_at = datetime.utcnow()
+
+    db.commit()
+
+    logger.info(f"Updated reservation: {reservation.name} ({reservation.id})")
+
+    return {
+        "success": True,
+        "message": f"Updated reservation: {reservation.name}"
+    }
+
+
+@router.delete("/api/fleet-calendar/reservations/{reservation_id}", response_class=JSONResponse)
+async def delete_reservation(
+    reservation_id: str,
+    db: Session = Depends(get_db)
+):
+    """Delete a reservation and its unit assignments."""
+    reservation = db.query(JobReservation).filter_by(id=reservation_id).first()
+    if not reservation:
+        raise HTTPException(status_code=404, detail="Reservation not found")
+
+    # Delete unit assignments first
+    db.query(JobReservationUnit).filter_by(reservation_id=reservation_id).delete()
+
+    # Delete the reservation
+    db.delete(reservation)
+    db.commit()
+
+    logger.info(f"Deleted reservation: {reservation.name} ({reservation_id})")
+
+    return {
+        "success": True,
+        "message": "Reservation deleted"
+    }
+
+
+# ============================================================================
+# Unit Assignment
+# ============================================================================
+
+@router.post("/api/fleet-calendar/reservations/{reservation_id}/assign-units", response_class=JSONResponse)
+async def assign_units_to_reservation(
+    reservation_id: str,
+    request: Request,
+    db: Session = Depends(get_db)
+):
+    """Assign specific units to a reservation."""
+    reservation = db.query(JobReservation).filter_by(id=reservation_id).first()
+    if not reservation:
+        raise HTTPException(status_code=404, detail="Reservation not found")
+
+    data = await request.json()
+    unit_ids = data.get("unit_ids", [])
+    # Optional per-unit dicts keyed by unit_id
+    power_types = data.get("power_types", {})
+    location_notes = data.get("location_notes", {})
+    location_names = data.get("location_names", {})
+    # slot_indices: {"BE17354": 0, "BE9441": 1, ...}
+    slot_indices = data.get("slot_indices", {})
+
+    # Verify units exist (allow empty list to clear all assignments)
+    if unit_ids:
+        units = db.query(RosterUnit).filter(RosterUnit.id.in_(unit_ids)).all()
+        found_ids = {u.id for u in units}
+        missing = set(unit_ids) - found_ids
+        if missing:
+            raise HTTPException(status_code=404, detail=f"Units not found: {', '.join(missing)}")
+
+    # Full replace: delete all existing assignments for this reservation first
+    db.query(JobReservationUnit).filter_by(reservation_id=reservation_id).delete()
+    db.flush()
+
+    # Check for conflicts with other reservations and insert new assignments
+    conflicts = []
+    for unit_id in unit_ids:
+        # Check overlapping reservations
+        if reservation.end_date:
+            overlapping = db.query(JobReservation).join(
+                JobReservationUnit, JobReservation.id == JobReservationUnit.reservation_id
+            ).filter(
+                JobReservationUnit.unit_id == unit_id,
+                JobReservation.id != reservation_id,
+                JobReservation.start_date <= reservation.end_date,
+                JobReservation.end_date >= reservation.start_date
+            ).first()
+
+            if overlapping:
+                conflicts.append({
+                    "unit_id": unit_id,
+                    "conflict_reservation": overlapping.name,
+                    "conflict_dates": f"{overlapping.start_date} - {overlapping.end_date}"
+                })
+                continue
+
+        # Add assignment
+        assignment = JobReservationUnit(
+            id=str(uuid.uuid4()),
+            reservation_id=reservation_id,
+            unit_id=unit_id,
+            assignment_source="filled" if reservation.assignment_type == "quantity" else "specific",
+            power_type=power_types.get(unit_id),
+            notes=location_notes.get(unit_id),
+            location_name=location_names.get(unit_id),
+            slot_index=slot_indices.get(unit_id),
+        )
+        db.add(assignment)
+
+    db.commit()
+
+    # Check for calibration conflicts
+    cal_conflicts = check_calibration_conflicts(db, reservation_id)
+
+    assigned_count = db.query(JobReservationUnit).filter_by(
+        reservation_id=reservation_id
+    ).count()
+
+    return {
+        "success": True,
+        "assigned_count": assigned_count,
+        "conflicts": conflicts,
+        "calibration_warnings": cal_conflicts,
+        "message": f"Assigned {len(unit_ids) - len(conflicts)} units"
+    }
+
+
+@router.delete("/api/fleet-calendar/reservations/{reservation_id}/units/{unit_id}", response_class=JSONResponse)
+async def remove_unit_from_reservation(
+    reservation_id: str,
+    unit_id: str,
+    db: Session = Depends(get_db)
+):
+    """Remove a unit from a reservation."""
+    assignment = db.query(JobReservationUnit).filter_by(
+        reservation_id=reservation_id,
+        unit_id=unit_id
+    ).first()
+
+    if not assignment:
+        raise HTTPException(status_code=404, detail="Unit assignment not found")
+
+    db.delete(assignment)
+    db.commit()
+
+    return {
+        "success": True,
+        "message": f"Removed {unit_id} from reservation"
+    }
+
+
+# ============================================================================
+# Availability & Conflicts
+# ============================================================================
+
+@router.get("/api/fleet-calendar/availability", response_class=JSONResponse)
+async def check_availability(
+    start_date: str,
+    end_date: str,
+    device_type: str = "seismograph",
+    exclude_reservation_id: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    """Get units available for a specific date range."""
+    try:
+        start = date.fromisoformat(start_date)
+        end = date.fromisoformat(end_date)
+    except ValueError:
+        raise HTTPException(status_code=400, detail="Invalid date format. Use YYYY-MM-DD")
+
+    available = get_available_units_for_period(
+        db, start, end, device_type, exclude_reservation_id
+    )
+
+    return {
+        "start_date": start_date,
+        "end_date": end_date,
+        "device_type": device_type,
+        "available_units": available,
+        "count": len(available)
+    }
+
+
+@router.get("/api/fleet-calendar/reservations/{reservation_id}/conflicts", response_class=JSONResponse)
+async def get_reservation_conflicts(
+    reservation_id: str,
+    db: Session = Depends(get_db)
+):
+    """Check for calibration conflicts in a reservation."""
+    reservation = db.query(JobReservation).filter_by(id=reservation_id).first()
+    if not reservation:
+        raise HTTPException(status_code=404, detail="Reservation not found")
+
+    conflicts = check_calibration_conflicts(db, reservation_id)
+
+    return {
+        "reservation_id": reservation_id,
+        "reservation_name": reservation.name,
+        "conflicts": conflicts,
+        "has_conflicts": len(conflicts) > 0
+    }
+
+
+# ============================================================================
+# HTMX Partials
+# ============================================================================
+
+@router.get("/api/fleet-calendar/reservations-list", response_class=HTMLResponse)
+async def get_reservations_list(
+    request: Request,
+    year: Optional[int] = None,
+    month: Optional[int] = None,
+    device_type: str = "seismograph",
+    db: Session = Depends(get_db)
+):
+    """Get list of reservations as HTMX partial."""
+    from sqlalchemy import or_
+
+    today = date.today()
+    if year is None:
+        year = today.year
+    if month is None:
+        month = today.month
+
+    # Calculate 12-month window
+    start_date = date(year, month, 1)
+    # End date is 12 months later
+    end_year = year + ((month + 10) // 12)
+    end_month = ((month + 10) % 12) + 1
+    if end_month == 12:
+        end_date = date(end_year, 12, 31)
+    else:
+        end_date = date(end_year, end_month + 1, 1) - timedelta(days=1)
+
+    # Filter by device_type and date window
+    reservations = db.query(JobReservation).filter(
+        JobReservation.device_type == device_type,
+        JobReservation.start_date <= end_date,
+        or_(
+            JobReservation.end_date >= start_date,
+            JobReservation.end_date == None  # TBD reservations
+        )
+    ).order_by(JobReservation.start_date).all()
+
+    # Get assignment counts
+    reservation_data = []
+    for res in reservations:
+        assignments = db.query(JobReservationUnit).filter_by(
+            reservation_id=res.id
+        ).all()
+        assigned_count = len(assignments)
+
+        # Enrich assignments with unit details, sorted by slot_index
+        assignments_sorted = sorted(assignments, key=lambda a: (a.slot_index if a.slot_index is not None else 999))
+        unit_ids = [a.unit_id for a in assignments_sorted]
+        units = db.query(RosterUnit).filter(RosterUnit.id.in_(unit_ids)).all() if unit_ids else []
+        units_by_id = {u.id: u for u in units}
+        assigned_units = [
+            {
+                "id": a.unit_id,
+                "power_type": a.power_type,
+                "notes": a.notes,
+                "location_name": a.location_name,
+                "slot_index": a.slot_index,
+                "deployed": units_by_id[a.unit_id].deployed if a.unit_id in units_by_id else False,
+                "last_calibrated": units_by_id[a.unit_id].last_calibrated if a.unit_id in units_by_id else None,
+            }
+            for a in assignments_sorted
+        ]
+
+        # Check for calibration conflicts
+        conflicts = check_calibration_conflicts(db, res.id)
+
+        location_count = res.quantity_needed or assigned_count
+        reservation_data.append({
+            "reservation": res,
+            "assigned_count": assigned_count,
+            "location_count": location_count,
+            "assigned_units": assigned_units,
+            "has_conflicts": len(conflicts) > 0,
+            "conflict_count": len(conflicts)
+        })
+
+    return templates.TemplateResponse(
+        "partials/fleet_calendar/reservations_list.html",
+        {
+            "request": request,
+            "reservations": reservation_data,
+            "year": year,
+            "device_type": device_type
+        }
+    )
+
+
+@router.get("/api/fleet-calendar/planner-availability", response_class=JSONResponse)
+async def get_planner_availability(
+    device_type: str = "seismograph",
+    start_date: Optional[str] = None,
+    end_date: Optional[str] = None,
+    exclude_reservation_id: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    """Get available units for the reservation planner split-panel UI.
+    Dates are optional — if omitted, returns all non-retired units regardless of reservations.
+    """
+    if start_date and end_date:
+        try:
+            start = date.fromisoformat(start_date)
+            end = date.fromisoformat(end_date)
+        except ValueError:
+            raise HTTPException(status_code=400, detail="Invalid date format. Use YYYY-MM-DD")
+        units = get_available_units_for_period(db, start, end, device_type, exclude_reservation_id)
+    else:
+        # No dates: return all non-retired units of this type, with current reservation info
+        from backend.models import RosterUnit as RU
+        from datetime import timedelta
+        today = date.today()
+        all_units = db.query(RU).filter(
+            RU.device_type == device_type,
+            RU.retired == False
+        ).all()
+
+        # Build a map: unit_id -> list of active/upcoming reservations
+        active_assignments = db.query(JobReservationUnit).join(
+            JobReservation, JobReservationUnit.reservation_id == JobReservation.id
+        ).filter(
+            JobReservation.device_type == device_type,
+            JobReservation.end_date >= today
+        ).all()
+        unit_reservations = {}
+        for assignment in active_assignments:
+            res = db.query(JobReservation).filter(JobReservation.id == assignment.reservation_id).first()
+            if not res:
+                continue
+            unit_reservations.setdefault(assignment.unit_id, []).append({
+                "reservation_id": res.id,
+                "reservation_name": res.name,
+                "start_date": res.start_date.isoformat() if res.start_date else None,
+                "end_date": res.end_date.isoformat() if res.end_date else None,
+                "color": res.color or "#3B82F6"
+            })
+
+        units = []
+        for u in all_units:
+            expiry = (u.last_calibrated + timedelta(days=365)) if u.last_calibrated else None
+            units.append({
+                "id": u.id,
+                "last_calibrated": u.last_calibrated.isoformat() if u.last_calibrated else None,
+                "expiry_date": expiry.isoformat() if expiry else None,
+                "calibration_status": "needs_calibration" if not u.last_calibrated else "valid",
+                "deployed": u.deployed,
+                "out_for_calibration": u.out_for_calibration or False,
+                "allocated": getattr(u, 'allocated', False) or False,
+                "allocated_to_project_id": getattr(u, 'allocated_to_project_id', None) or "",
+                "note": u.note or "",
+                "reservations": unit_reservations.get(u.id, [])
+            })
+
+    # Sort: benched first (easier to assign), then deployed, then by ID
+    units.sort(key=lambda u: (1 if u["deployed"] else 0, u["id"]))
+
+    return {
+        "units": units,
+        "start_date": start_date,
+        "end_date": end_date,
+        "count": len(units)
+    }
+
+
+@router.get("/api/fleet-calendar/unit-quick-info/{unit_id}", response_class=JSONResponse)
+async def get_unit_quick_info(unit_id: str, db: Session = Depends(get_db)):
+    """Return at-a-glance info for the planner quick-view modal."""
+    from backend.models import Emitter
+    u = db.query(RosterUnit).filter(RosterUnit.id == unit_id).first()
+    if not u:
+        raise HTTPException(status_code=404, detail="Unit not found")
+
+    today = date.today()
+    expiry = (u.last_calibrated + timedelta(days=365)) if u.last_calibrated else None
+
+    # Active/upcoming reservations
+    assignments = db.query(JobReservationUnit).filter(JobReservationUnit.unit_id == unit_id).all()
+    reservations = []
+    for a in assignments:
+        res = db.query(JobReservation).filter(
+            JobReservation.id == a.reservation_id,
+            JobReservation.end_date >= today
+        ).first()
+        if res:
+            reservations.append({
+                "name": res.name,
+                "start_date": res.start_date.isoformat() if res.start_date else None,
+                "end_date": res.end_date.isoformat() if res.end_date else None,
+                "end_date_tbd": res.end_date_tbd,
+                "color": res.color or "#3B82F6",
+                "location_name": a.location_name,
+            })
+
+    # Last seen from emitter
+    emitter = db.query(Emitter).filter(Emitter.unit_type == unit_id).first()
+
+    return {
+        "id": u.id,
+        "unit_type": u.unit_type,
+        "deployed": u.deployed,
+        "out_for_calibration": u.out_for_calibration or False,
+        "note": u.note or "",
+        "project_id": u.project_id or "",
+        "address": u.address or u.location or "",
+        "coordinates": u.coordinates or "",
+        "deployed_with_modem_id": u.deployed_with_modem_id or "",
+        "last_calibrated": u.last_calibrated.isoformat() if u.last_calibrated else None,
+        "next_calibration_due": u.next_calibration_due.isoformat() if u.next_calibration_due else (expiry.isoformat() if expiry else None),
+        "cal_expired": not u.last_calibrated or (expiry and expiry < today),
+        "last_seen": emitter.last_seen.isoformat() if emitter and emitter.last_seen else None,
+        "reservations": reservations,
+    }
+
+
+@router.get("/api/fleet-calendar/available-units", response_class=HTMLResponse)
+async def get_available_units_partial(
+    request: Request,
+    start_date: str,
+    end_date: str,
+    device_type: str = "seismograph",
+    reservation_id: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    """Get available units as HTMX partial for the assignment modal."""
+    try:
+        start = date.fromisoformat(start_date)
+        end = date.fromisoformat(end_date)
+    except ValueError:
+        raise HTTPException(status_code=400, detail="Invalid date format")
+
+    available = get_available_units_for_period(
+        db, start, end, device_type, reservation_id
+    )
+
+    return templates.TemplateResponse(
+        "partials/fleet_calendar/available_units.html",
+        {
+            "request": request,
+            "units": available,
+            "start_date": start_date,
+            "end_date": end_date,
+            "device_type": device_type,
+            "reservation_id": reservation_id
+        }
+    )
+
+
+@router.get("/api/fleet-calendar/month/{year}/{month}", response_class=HTMLResponse)
+async def get_month_partial(
+    request: Request,
+    year: int,
+    month: int,
+    device_type: str = "seismograph",
+    db: Session = Depends(get_db)
+):
+    """Get a single month calendar as HTMX partial."""
+    calendar_data = get_calendar_year_data(db, year, device_type)
+    month_data = calendar_data["months"].get(month)
+
+    if not month_data:
+        raise HTTPException(status_code=404, detail="Invalid month")
+
+    return templates.TemplateResponse(
+        "partials/fleet_calendar/month_grid.html",
+        {
+            "request": request,
+            "year": year,
+            "month": month,
+            "month_data": month_data,
+            "device_type": device_type,
+            "today": date.today().isoformat()
+        }
+    )
+
+
+# ============================================================================
+# Promote Reservation to Project
+# ============================================================================
+
+@router.post("/api/fleet-calendar/reservations/{reservation_id}/promote-to-project", response_class=JSONResponse)
+async def promote_reservation_to_project(
+    reservation_id: str,
+    request: Request,
+    db: Session = Depends(get_db)
+):
+    """
+    Promote a job reservation to a full project in the projects DB.
+    Creates: Project + MonitoringLocations + UnitAssignments.
+    """
+    reservation = db.query(JobReservation).filter_by(id=reservation_id).first()
+    if not reservation:
+        raise HTTPException(status_code=404, detail="Reservation not found")
+
+    data = await request.json()
+    project_number = data.get("project_number") or None
+    client_name = data.get("client_name") or None
+
+    # Map device_type to project_type_id
+    if reservation.device_type == "slm":
+        project_type_id = "sound_monitoring"
+        location_type = "sound"
+    else:
+        project_type_id = "vibration_monitoring"
+        location_type = "vibration"
+
+    # Check for duplicate project name
+    existing = db.query(Project).filter_by(name=reservation.name).first()
+    if existing:
+        raise HTTPException(status_code=409, detail=f"A project named '{reservation.name}' already exists.")
+
+    # Create the project
+    project_id = str(uuid.uuid4())
+    project = Project(
+        id=project_id,
+        name=reservation.name,
+        project_number=project_number,
+        client_name=client_name,
+        project_type_id=project_type_id,
+        status="upcoming",
+        start_date=reservation.start_date,
+        end_date=reservation.end_date,
+        description=reservation.notes,
+    )
+    db.add(project)
+    db.flush()
+
+    # Load assignments sorted by slot_index
+    assignments = db.query(JobReservationUnit).filter_by(reservation_id=reservation_id).all()
+    assignments_sorted = sorted(assignments, key=lambda a: (a.slot_index if a.slot_index is not None else 999))
+
+    locations_created = 0
+    units_assigned = 0
+
+    for i, assignment in enumerate(assignments_sorted):
+        loc_num = str(i + 1).zfill(3)
+        loc_name = assignment.location_name or f"Location {i + 1}"
+
+        location = MonitoringLocation(
+            id=str(uuid.uuid4()),
+            project_id=project_id,
+            location_type=location_type,
+            name=loc_name,
+            description=assignment.notes,
+        )
+        db.add(location)
+        db.flush()
+        locations_created += 1
+
+        if assignment.unit_id:
+            unit_assignment = UnitAssignment(
+                id=str(uuid.uuid4()),
+                unit_id=assignment.unit_id,
+                location_id=location.id,
+                project_id=project_id,
+                device_type=reservation.device_type or "seismograph",
+                status="active",
+                notes=f"Power: {assignment.power_type}" if assignment.power_type else None,
+            )
+            db.add(unit_assignment)
+            units_assigned += 1
+
+    db.commit()
+
+    logger.info(f"Promoted reservation '{reservation.name}' to project {project_id}")
+
+    return {
+        "success": True,
+        "project_id": project_id,
+        "project_name": reservation.name,
+        "locations_created": locations_created,
+        "units_assigned": units_assigned,
+    }

backend/routers/modem_dashboard.py

@@ -0,0 +1,429 @@
+"""
+Modem Dashboard Router
+
+Provides API endpoints for the Field Modems management page.
+"""
+
+from fastapi import APIRouter, Request, Depends, Query
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+from datetime import datetime
+import subprocess
+import time
+import logging
+
+from backend.database import get_db
+from backend.models import RosterUnit
+from backend.templates_config import templates
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/api/modem-dashboard", tags=["modem-dashboard"])
+
+
+@router.get("/stats", response_class=HTMLResponse)
+async def get_modem_stats(request: Request, db: Session = Depends(get_db)):
+    """
+    Get summary statistics for modem dashboard.
+    Returns HTML partial with stat cards.
+    """
+    # Query all modems
+    all_modems = db.query(RosterUnit).filter_by(device_type="modem").all()
+
+    # Get IDs of modems that have devices paired to them
+    paired_modem_ids = set()
+    devices_with_modems = db.query(RosterUnit).filter(
+        RosterUnit.deployed_with_modem_id.isnot(None),
+        RosterUnit.retired == False
+    ).all()
+    for device in devices_with_modems:
+        if device.deployed_with_modem_id:
+            paired_modem_ids.add(device.deployed_with_modem_id)
+
+    # Count categories
+    total_count = len(all_modems)
+    retired_count = sum(1 for m in all_modems if m.retired)
+
+    # In use = deployed AND paired with a device
+    in_use_count = sum(1 for m in all_modems
+                       if m.deployed and not m.retired and m.id in paired_modem_ids)
+
+    # Spare = deployed but NOT paired (available for assignment)
+    spare_count = sum(1 for m in all_modems
+                      if m.deployed and not m.retired and m.id not in paired_modem_ids)
+
+    # Benched = not deployed and not retired
+    benched_count = sum(1 for m in all_modems if not m.deployed and not m.retired)
+
+    return templates.TemplateResponse("partials/modem_stats.html", {
+        "request": request,
+        "total_count": total_count,
+        "in_use_count": in_use_count,
+        "spare_count": spare_count,
+        "benched_count": benched_count,
+        "retired_count": retired_count
+    })
+
+
+@router.get("/units", response_class=HTMLResponse)
+async def get_modem_units(
+    request: Request,
+    db: Session = Depends(get_db),
+    search: str = Query(None),
+    filter_status: str = Query(None),  # "in_use", "spare", "benched", "retired"
+):
+    """
+    Get list of modem units for the dashboard.
+    Returns HTML partial with modem cards.
+    """
+    query = db.query(RosterUnit).filter_by(device_type="modem")
+
+    # Filter by search term if provided
+    if search:
+        search_term = f"%{search}%"
+        query = query.filter(
+            (RosterUnit.id.ilike(search_term)) |
+            (RosterUnit.ip_address.ilike(search_term)) |
+            (RosterUnit.hardware_model.ilike(search_term)) |
+            (RosterUnit.phone_number.ilike(search_term)) |
+            (RosterUnit.location.ilike(search_term))
+        )
+
+    modems = query.order_by(
+        RosterUnit.retired.asc(),
+        RosterUnit.deployed.desc(),
+        RosterUnit.id.asc()
+    ).all()
+
+    # Get paired device info for each modem
+    paired_devices = {}
+    devices_with_modems = db.query(RosterUnit).filter(
+        RosterUnit.deployed_with_modem_id.isnot(None),
+        RosterUnit.retired == False
+    ).all()
+    for device in devices_with_modems:
+        if device.deployed_with_modem_id:
+            paired_devices[device.deployed_with_modem_id] = {
+                "id": device.id,
+                "device_type": device.device_type,
+                "deployed": device.deployed
+            }
+
+    # Annotate modems with paired device info
+    modem_list = []
+    for modem in modems:
+        paired = paired_devices.get(modem.id)
+
+        # Determine status category
+        if modem.retired:
+            status = "retired"
+        elif not modem.deployed:
+            status = "benched"
+        elif paired:
+            status = "in_use"
+        else:
+            status = "spare"
+
+        # Apply filter if specified
+        if filter_status and status != filter_status:
+            continue
+
+        modem_list.append({
+            "id": modem.id,
+            "ip_address": modem.ip_address,
+            "phone_number": modem.phone_number,
+            "hardware_model": modem.hardware_model,
+            "deployed": modem.deployed,
+            "retired": modem.retired,
+            "location": modem.location,
+            "project_id": modem.project_id,
+            "paired_device": paired,
+            "status": status
+        })
+
+    return templates.TemplateResponse("partials/modem_list.html", {
+        "request": request,
+        "modems": modem_list
+    })
+
+
+@router.get("/{modem_id}/paired-device")
+async def get_paired_device(modem_id: str, db: Session = Depends(get_db)):
+    """
+    Get the device (SLM/seismograph) that is paired with this modem.
+    Returns JSON with device info or null if not paired.
+    """
+    # Check modem exists
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+    if not modem:
+        return {"status": "error", "detail": f"Modem {modem_id} not found"}
+
+    # Find device paired with this modem
+    device = db.query(RosterUnit).filter(
+        RosterUnit.deployed_with_modem_id == modem_id,
+        RosterUnit.retired == False
+    ).first()
+
+    if device:
+        return {
+            "paired": True,
+            "device": {
+                "id": device.id,
+                "device_type": device.device_type,
+                "deployed": device.deployed,
+                "project_id": device.project_id,
+                "location": device.location or device.address
+            }
+        }
+
+    return {"paired": False, "device": None}
+
+
+@router.get("/{modem_id}/paired-device-html", response_class=HTMLResponse)
+async def get_paired_device_html(modem_id: str, request: Request, db: Session = Depends(get_db)):
+    """
+    Get HTML partial showing the device paired with this modem.
+    Used by unit_detail.html for modems.
+    """
+    # Check modem exists
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+    if not modem:
+        return HTMLResponse('<p class="text-red-500">Modem not found</p>')
+
+    # Find device paired with this modem
+    device = db.query(RosterUnit).filter(
+        RosterUnit.deployed_with_modem_id == modem_id,
+        RosterUnit.retired == False
+    ).first()
+
+    return templates.TemplateResponse("partials/modem_paired_device.html", {
+        "request": request,
+        "modem_id": modem_id,
+        "device": device
+    })
+
+
+@router.get("/{modem_id}/ping")
+async def ping_modem(modem_id: str, db: Session = Depends(get_db)):
+    """
+    Test modem connectivity with a simple ping.
+    Returns response time and connection status.
+    """
+    # Get modem from database
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+
+    if not modem:
+        return {"status": "error", "detail": f"Modem {modem_id} not found"}
+
+    if not modem.ip_address:
+        return {"status": "error", "detail": f"Modem {modem_id} has no IP address configured"}
+
+    try:
+        # Ping the modem (1 packet, 2 second timeout)
+        start_time = time.time()
+        result = subprocess.run(
+            ["ping", "-c", "1", "-W", "2", modem.ip_address],
+            capture_output=True,
+            text=True,
+            timeout=3
+        )
+        response_time = int((time.time() - start_time) * 1000)  # Convert to milliseconds
+
+        if result.returncode == 0:
+            return {
+                "status": "success",
+                "modem_id": modem_id,
+                "ip_address": modem.ip_address,
+                "response_time_ms": response_time,
+                "message": "Modem is responding"
+            }
+        else:
+            return {
+                "status": "error",
+                "modem_id": modem_id,
+                "ip_address": modem.ip_address,
+                "detail": "Modem not responding to ping"
+            }
+
+    except subprocess.TimeoutExpired:
+        return {
+            "status": "error",
+            "modem_id": modem_id,
+            "ip_address": modem.ip_address,
+            "detail": "Ping timeout"
+        }
+    except Exception as e:
+        logger.error(f"Failed to ping modem {modem_id}: {e}")
+        return {
+            "status": "error",
+            "modem_id": modem_id,
+            "detail": str(e)
+        }
+
+
+@router.get("/{modem_id}/diagnostics")
+async def get_modem_diagnostics(modem_id: str, db: Session = Depends(get_db)):
+    """
+    Get modem diagnostics (signal strength, data usage, uptime).
+
+    Currently returns placeholders. When ModemManager is available,
+    this endpoint will query it for real diagnostics.
+    """
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+    if not modem:
+        return {"status": "error", "detail": f"Modem {modem_id} not found"}
+
+    # TODO: Query ModemManager backend when available
+    return {
+        "status": "unavailable",
+        "message": "ModemManager integration not yet available",
+        "modem_id": modem_id,
+        "signal_strength_dbm": None,
+        "data_usage_mb": None,
+        "uptime_seconds": None,
+        "carrier": None,
+        "connection_type": None  # LTE, 5G, etc.
+    }
+
+
+@router.get("/{modem_id}/pairable-devices")
+async def get_pairable_devices(
+    modem_id: str,
+    db: Session = Depends(get_db),
+    search: str = Query(None),
+    hide_paired: bool = Query(True)
+):
+    """
+    Get list of devices (seismographs and SLMs) that can be paired with this modem.
+    Used by the device picker modal in unit_detail.html.
+    """
+    # Check modem exists
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+    if not modem:
+        return {"status": "error", "detail": f"Modem {modem_id} not found"}
+
+    # Query seismographs and SLMs
+    query = db.query(RosterUnit).filter(
+        RosterUnit.device_type.in_(["seismograph", "sound_level_meter"]),
+        RosterUnit.retired == False
+    )
+
+    # Filter by search term if provided
+    if search:
+        search_term = f"%{search}%"
+        query = query.filter(
+            (RosterUnit.id.ilike(search_term)) |
+            (RosterUnit.project_id.ilike(search_term)) |
+            (RosterUnit.location.ilike(search_term)) |
+            (RosterUnit.address.ilike(search_term)) |
+            (RosterUnit.note.ilike(search_term))
+        )
+
+    devices = query.order_by(
+        RosterUnit.deployed.desc(),
+        RosterUnit.device_type.asc(),
+        RosterUnit.id.asc()
+    ).all()
+
+    # Build device list
+    device_list = []
+    for device in devices:
+        # Skip already paired devices if hide_paired is True
+        is_paired_to_other = (
+            device.deployed_with_modem_id is not None and
+            device.deployed_with_modem_id != modem_id
+        )
+        is_paired_to_this = device.deployed_with_modem_id == modem_id
+
+        if hide_paired and is_paired_to_other:
+            continue
+
+        device_list.append({
+            "id": device.id,
+            "device_type": device.device_type,
+            "deployed": device.deployed,
+            "project_id": device.project_id,
+            "location": device.location or device.address,
+            "note": device.note,
+            "paired_modem_id": device.deployed_with_modem_id,
+            "is_paired_to_this": is_paired_to_this,
+            "is_paired_to_other": is_paired_to_other
+        })
+
+    return {"devices": device_list, "modem_id": modem_id}
+
+
+@router.post("/{modem_id}/pair")
+async def pair_device_to_modem(
+    modem_id: str,
+    db: Session = Depends(get_db),
+    device_id: str = Query(..., description="ID of the device to pair")
+):
+    """
+    Pair a device (seismograph or SLM) to this modem.
+    Updates the device's deployed_with_modem_id field.
+    """
+    # Check modem exists
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+    if not modem:
+        return {"status": "error", "detail": f"Modem {modem_id} not found"}
+
+    # Find the device
+    device = db.query(RosterUnit).filter(
+        RosterUnit.id == device_id,
+        RosterUnit.device_type.in_(["seismograph", "sound_level_meter"]),
+        RosterUnit.retired == False
+    ).first()
+    if not device:
+        return {"status": "error", "detail": f"Device {device_id} not found"}
+
+    # Unpair any device currently paired to this modem
+    currently_paired = db.query(RosterUnit).filter(
+        RosterUnit.deployed_with_modem_id == modem_id
+    ).all()
+    for paired_device in currently_paired:
+        paired_device.deployed_with_modem_id = None
+
+    # Pair the new device
+    device.deployed_with_modem_id = modem_id
+    db.commit()
+
+    return {
+        "status": "success",
+        "modem_id": modem_id,
+        "device_id": device_id,
+        "message": f"Device {device_id} paired to modem {modem_id}"
+    }
+
+
+@router.post("/{modem_id}/unpair")
+async def unpair_device_from_modem(modem_id: str, db: Session = Depends(get_db)):
+    """
+    Unpair any device currently paired to this modem.
+    """
+    # Check modem exists
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+    if not modem:
+        return {"status": "error", "detail": f"Modem {modem_id} not found"}
+
+    # Find and unpair device
+    device = db.query(RosterUnit).filter(
+        RosterUnit.deployed_with_modem_id == modem_id
+    ).first()
+
+    if device:
+        old_device_id = device.id
+        device.deployed_with_modem_id = None
+        db.commit()
+        return {
+            "status": "success",
+            "modem_id": modem_id,
+            "unpaired_device_id": old_device_id,
+            "message": f"Device {old_device_id} unpaired from modem {modem_id}"
+        }
+
+    return {
+        "status": "success",
+        "modem_id": modem_id,
+        "message": "No device was paired to this modem"
+    }

backend/routers/photos.py

@@ -0,0 +1,242 @@
+from fastapi import APIRouter, HTTPException, UploadFile, File, Depends
+from fastapi.responses import FileResponse, JSONResponse
+from pathlib import Path
+from typing import List, Optional
+from datetime import datetime
+import os
+import shutil
+from PIL import Image
+from PIL.ExifTags import TAGS, GPSTAGS
+from sqlalchemy.orm import Session
+from backend.database import get_db
+from backend.models import RosterUnit
+
+router = APIRouter(prefix="/api", tags=["photos"])
+
+PHOTOS_BASE_DIR = Path("data/photos")
+
+
+def extract_exif_data(image_path: Path) -> dict:
+    """
+    Extract EXIF metadata from an image file.
+    Returns dict with timestamp, GPS coordinates, and other metadata.
+    """
+    try:
+        image = Image.open(image_path)
+        exif_data = image._getexif()
+
+        if not exif_data:
+            return {}
+
+        metadata = {}
+
+        # Extract standard EXIF tags
+        for tag_id, value in exif_data.items():
+            tag = TAGS.get(tag_id, tag_id)
+
+            # Extract datetime
+            if tag == "DateTime" or tag == "DateTimeOriginal":
+                try:
+                    metadata["timestamp"] = datetime.strptime(str(value), "%Y:%m:%d %H:%M:%S")
+                except:
+                    pass
+
+            # Extract GPS data
+            if tag == "GPSInfo":
+                gps_data = {}
+                for gps_tag_id in value:
+                    gps_tag = GPSTAGS.get(gps_tag_id, gps_tag_id)
+                    gps_data[gps_tag] = value[gps_tag_id]
+
+                # Convert GPS data to decimal degrees
+                lat = gps_data.get("GPSLatitude")
+                lat_ref = gps_data.get("GPSLatitudeRef")
+                lon = gps_data.get("GPSLongitude")
+                lon_ref = gps_data.get("GPSLongitudeRef")
+
+                if lat and lon and lat_ref and lon_ref:
+                    # Convert to decimal degrees
+                    lat_decimal = convert_to_degrees(lat)
+                    if lat_ref == "S":
+                        lat_decimal = -lat_decimal
+
+                    lon_decimal = convert_to_degrees(lon)
+                    if lon_ref == "W":
+                        lon_decimal = -lon_decimal
+
+                    metadata["latitude"] = lat_decimal
+                    metadata["longitude"] = lon_decimal
+                    metadata["coordinates"] = f"{lat_decimal},{lon_decimal}"
+
+        return metadata
+    except Exception as e:
+        print(f"Error extracting EXIF data: {e}")
+        return {}
+
+
+def convert_to_degrees(value):
+    """
+    Convert GPS coordinates from degrees/minutes/seconds to decimal degrees.
+    """
+    d, m, s = value
+    return float(d) + (float(m) / 60.0) + (float(s) / 3600.0)
+
+
+@router.post("/unit/{unit_id}/upload-photo")
+async def upload_photo(
+    unit_id: str,
+    photo: UploadFile = File(...),
+    auto_populate_coords: bool = True,
+    db: Session = Depends(get_db)
+):
+    """
+    Upload a photo for a unit and extract EXIF metadata.
+    If GPS data exists and auto_populate_coords is True, update the unit's coordinates.
+    """
+    # Validate file type
+    allowed_extensions = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
+    file_ext = Path(photo.filename).suffix.lower()
+
+    if file_ext not in allowed_extensions:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Invalid file type. Allowed: {', '.join(allowed_extensions)}"
+        )
+
+    # Create photos directory for this unit
+    unit_photo_dir = PHOTOS_BASE_DIR / unit_id
+    unit_photo_dir.mkdir(parents=True, exist_ok=True)
+
+    # Generate filename with timestamp to avoid collisions
+    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+    filename = f"{timestamp}_{photo.filename}"
+    file_path = unit_photo_dir / filename
+
+    # Save the file
+    try:
+        with open(file_path, "wb") as buffer:
+            shutil.copyfileobj(photo.file, buffer)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Failed to save photo: {str(e)}")
+
+    # Extract EXIF metadata
+    metadata = extract_exif_data(file_path)
+
+    # Update unit coordinates if GPS data exists and auto_populate_coords is True
+    coordinates_updated = False
+    if auto_populate_coords and "coordinates" in metadata:
+        roster_unit = db.query(RosterUnit).filter(RosterUnit.id == unit_id).first()
+
+        if roster_unit:
+            roster_unit.coordinates = metadata["coordinates"]
+            roster_unit.last_updated = datetime.utcnow()
+            db.commit()
+            coordinates_updated = True
+
+    return JSONResponse(content={
+        "success": True,
+        "filename": filename,
+        "file_path": f"/api/unit/{unit_id}/photo/{filename}",
+        "metadata": {
+            "timestamp": metadata.get("timestamp").isoformat() if metadata.get("timestamp") else None,
+            "latitude": metadata.get("latitude"),
+            "longitude": metadata.get("longitude"),
+            "coordinates": metadata.get("coordinates")
+        },
+        "coordinates_updated": coordinates_updated
+    })
+
+
+@router.get("/unit/{unit_id}/photos")
+def get_unit_photos(unit_id: str):
+    """
+    Reads /data/photos/<unit_id>/ and returns list of image filenames.
+    Primary photo = most recent file.
+    """
+    unit_photo_dir = PHOTOS_BASE_DIR / unit_id
+
+    if not unit_photo_dir.exists():
+        # Return empty list if no photos directory exists
+        return {
+            "unit_id": unit_id,
+            "photos": [],
+            "primary_photo": None
+        }
+
+    # Get all image files
+    image_extensions = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
+    photos = []
+
+    for file_path in unit_photo_dir.iterdir():
+        if file_path.is_file() and file_path.suffix.lower() in image_extensions:
+            photos.append({
+                "filename": file_path.name,
+                "path": f"/api/unit/{unit_id}/photo/{file_path.name}",
+                "modified": file_path.stat().st_mtime
+            })
+
+    # Sort by modification time (most recent first)
+    photos.sort(key=lambda x: x["modified"], reverse=True)
+
+    # Primary photo is the most recent
+    primary_photo = photos[0]["filename"] if photos else None
+
+    return {
+        "unit_id": unit_id,
+        "photos": [p["filename"] for p in photos],
+        "primary_photo": primary_photo,
+        "photo_urls": [p["path"] for p in photos]
+    }
+
+
+@router.get("/recent-photos")
+def get_recent_photos(limit: int = 12):
+    """
+    Get the most recently uploaded photos across all units.
+    Returns photos sorted by modification time (newest first).
+    """
+    if not PHOTOS_BASE_DIR.exists():
+        return {"photos": []}
+
+    all_photos = []
+    image_extensions = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
+
+    # Scan all unit directories
+    for unit_dir in PHOTOS_BASE_DIR.iterdir():
+        if not unit_dir.is_dir():
+            continue
+
+        unit_id = unit_dir.name
+
+        # Get all photos in this unit's directory
+        for file_path in unit_dir.iterdir():
+            if file_path.is_file() and file_path.suffix.lower() in image_extensions:
+                all_photos.append({
+                    "unit_id": unit_id,
+                    "filename": file_path.name,
+                    "path": f"/api/unit/{unit_id}/photo/{file_path.name}",
+                    "modified": file_path.stat().st_mtime,
+                    "modified_iso": datetime.fromtimestamp(file_path.stat().st_mtime).isoformat()
+                })
+
+    # Sort by modification time (most recent first) and limit
+    all_photos.sort(key=lambda x: x["modified"], reverse=True)
+    recent_photos = all_photos[:limit]
+
+    return {
+        "photos": recent_photos,
+        "total": len(all_photos)
+    }
+
+
+@router.get("/unit/{unit_id}/photo/{filename}")
+def get_photo(unit_id: str, filename: str):
+    """
+    Serves a specific photo file.
+    """
+    file_path = PHOTOS_BASE_DIR / unit_id / filename
+
+    if not file_path.exists() or not file_path.is_file():
+        raise HTTPException(status_code=404, detail="Photo not found")
+
+    return FileResponse(file_path)

backend/routers/recurring_schedules.py

@@ -0,0 +1,522 @@
+"""
+Recurring Schedules Router
+
+API endpoints for managing recurring monitoring schedules.
+"""
+
+from fastapi import APIRouter, Request, Depends, HTTPException, Query
+from fastapi.responses import HTMLResponse, JSONResponse
+from sqlalchemy.orm import Session
+from typing import Optional
+from datetime import datetime
+import json
+
+from backend.database import get_db
+from backend.models import RecurringSchedule, MonitoringLocation, Project, RosterUnit
+from backend.services.recurring_schedule_service import get_recurring_schedule_service
+from backend.templates_config import templates
+
+router = APIRouter(prefix="/api/projects/{project_id}/recurring-schedules", tags=["recurring-schedules"])
+
+
+# ============================================================================
+# List and Get
+# ============================================================================
+
+@router.get("/")
+async def list_recurring_schedules(
+    project_id: str,
+    db: Session = Depends(get_db),
+    enabled_only: bool = Query(False),
+):
+    """
+    List all recurring schedules for a project.
+    """
+    project = db.query(Project).filter_by(id=project_id).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    query = db.query(RecurringSchedule).filter_by(project_id=project_id)
+    if enabled_only:
+        query = query.filter_by(enabled=True)
+
+    schedules = query.order_by(RecurringSchedule.created_at.desc()).all()
+
+    return {
+        "schedules": [
+            {
+                "id": s.id,
+                "name": s.name,
+                "schedule_type": s.schedule_type,
+                "device_type": s.device_type,
+                "location_id": s.location_id,
+                "unit_id": s.unit_id,
+                "enabled": s.enabled,
+                "weekly_pattern": json.loads(s.weekly_pattern) if s.weekly_pattern else None,
+                "interval_type": s.interval_type,
+                "cycle_time": s.cycle_time,
+                "include_download": s.include_download,
+                "timezone": s.timezone,
+                "next_occurrence": s.next_occurrence.isoformat() if s.next_occurrence else None,
+                "last_generated_at": s.last_generated_at.isoformat() if s.last_generated_at else None,
+                "created_at": s.created_at.isoformat() if s.created_at else None,
+            }
+            for s in schedules
+        ],
+        "count": len(schedules),
+    }
+
+
+@router.get("/{schedule_id}")
+async def get_recurring_schedule(
+    project_id: str,
+    schedule_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Get a specific recurring schedule.
+    """
+    schedule = db.query(RecurringSchedule).filter_by(
+        id=schedule_id,
+        project_id=project_id,
+    ).first()
+
+    if not schedule:
+        raise HTTPException(status_code=404, detail="Schedule not found")
+
+    # Get related location and unit info
+    location = db.query(MonitoringLocation).filter_by(id=schedule.location_id).first()
+    unit = None
+    if schedule.unit_id:
+        unit = db.query(RosterUnit).filter_by(id=schedule.unit_id).first()
+
+    return {
+        "id": schedule.id,
+        "name": schedule.name,
+        "schedule_type": schedule.schedule_type,
+        "device_type": schedule.device_type,
+        "location_id": schedule.location_id,
+        "location_name": location.name if location else None,
+        "unit_id": schedule.unit_id,
+        "unit_name": unit.id if unit else None,
+        "enabled": schedule.enabled,
+        "weekly_pattern": json.loads(schedule.weekly_pattern) if schedule.weekly_pattern else None,
+        "interval_type": schedule.interval_type,
+        "cycle_time": schedule.cycle_time,
+        "include_download": schedule.include_download,
+        "timezone": schedule.timezone,
+        "next_occurrence": schedule.next_occurrence.isoformat() if schedule.next_occurrence else None,
+        "last_generated_at": schedule.last_generated_at.isoformat() if schedule.last_generated_at else None,
+        "created_at": schedule.created_at.isoformat() if schedule.created_at else None,
+        "updated_at": schedule.updated_at.isoformat() if schedule.updated_at else None,
+    }
+
+
+# ============================================================================
+# Create
+# ============================================================================
+
+@router.post("/")
+async def create_recurring_schedule(
+    project_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    """
+    Create recurring schedules for one or more locations.
+
+    Body for weekly_calendar (supports multiple locations):
+    {
+        "name": "Weeknight Monitoring",
+        "schedule_type": "weekly_calendar",
+        "location_ids": ["uuid1", "uuid2"],  // Array of location IDs
+        "weekly_pattern": {
+            "monday": {"enabled": true, "start": "19:00", "end": "07:00"},
+            "tuesday": {"enabled": false},
+            ...
+        },
+        "include_download": true,
+        "auto_increment_index": true,
+        "timezone": "America/New_York"
+    }
+
+    Body for simple_interval (supports multiple locations):
+    {
+        "name": "24/7 Continuous",
+        "schedule_type": "simple_interval",
+        "location_ids": ["uuid1", "uuid2"],  // Array of location IDs
+        "interval_type": "daily",
+        "cycle_time": "00:00",
+        "include_download": true,
+        "auto_increment_index": true,
+        "timezone": "America/New_York"
+    }
+
+    Legacy single location support (backwards compatible):
+    {
+        "name": "...",
+        "location_id": "uuid",  // Single location ID
+        ...
+    }
+    """
+    project = db.query(Project).filter_by(id=project_id).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    data = await request.json()
+
+    # Support both location_ids (array) and location_id (single) for backwards compatibility
+    location_ids = data.get("location_ids", [])
+    if not location_ids and data.get("location_id"):
+        location_ids = [data.get("location_id")]
+
+    if not location_ids:
+        raise HTTPException(status_code=400, detail="At least one location is required")
+
+    # Validate all locations exist
+    locations = db.query(MonitoringLocation).filter(
+        MonitoringLocation.id.in_(location_ids),
+        MonitoringLocation.project_id == project_id,
+    ).all()
+
+    if len(locations) != len(location_ids):
+        raise HTTPException(status_code=404, detail="One or more locations not found")
+
+    service = get_recurring_schedule_service(db)
+    created_schedules = []
+    base_name = data.get("name", "Unnamed Schedule")
+
+    # Parse one-off datetime fields if applicable
+    one_off_start = None
+    one_off_end = None
+    if data.get("schedule_type") == "one_off":
+        from zoneinfo import ZoneInfo
+
+        tz = ZoneInfo(data.get("timezone", "America/New_York"))
+
+        start_dt_str = data.get("start_datetime")
+        end_dt_str = data.get("end_datetime")
+
+        if not start_dt_str or not end_dt_str:
+            raise HTTPException(status_code=400, detail="One-off schedules require start and end date/time")
+
+        try:
+            start_local = datetime.fromisoformat(start_dt_str).replace(tzinfo=tz)
+            end_local = datetime.fromisoformat(end_dt_str).replace(tzinfo=tz)
+        except ValueError:
+            raise HTTPException(status_code=400, detail="Invalid datetime format")
+
+        duration = end_local - start_local
+        if duration.total_seconds() < 900:
+            raise HTTPException(status_code=400, detail="Duration must be at least 15 minutes")
+        if duration.total_seconds() > 86400:
+            raise HTTPException(status_code=400, detail="Duration cannot exceed 24 hours")
+
+        from datetime import timezone as dt_timezone
+        now_local = datetime.now(tz)
+        if start_local <= now_local:
+            raise HTTPException(status_code=400, detail="Start time must be in the future")
+
+        # Convert to UTC for storage
+        one_off_start = start_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+        one_off_end = end_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+
+    # Create a schedule for each location
+    for location in locations:
+        # Determine device type from location
+        device_type = "slm" if location.location_type == "sound" else "seismograph"
+
+        # Append location name if multiple locations
+        schedule_name = f"{base_name} - {location.name}" if len(locations) > 1 else base_name
+
+        schedule = service.create_schedule(
+            project_id=project_id,
+            location_id=location.id,
+            name=schedule_name,
+            schedule_type=data.get("schedule_type", "weekly_calendar"),
+            device_type=device_type,
+            unit_id=data.get("unit_id"),
+            weekly_pattern=data.get("weekly_pattern"),
+            interval_type=data.get("interval_type"),
+            cycle_time=data.get("cycle_time"),
+            include_download=data.get("include_download", True),
+            auto_increment_index=data.get("auto_increment_index", True),
+            timezone=data.get("timezone", "America/New_York"),
+            start_datetime=one_off_start,
+            end_datetime=one_off_end,
+        )
+
+        # Generate actions immediately so they appear right away
+        generated_actions = service.generate_actions_for_schedule(schedule, horizon_days=7)
+
+        created_schedules.append({
+            "schedule_id": schedule.id,
+            "location_id": location.id,
+            "location_name": location.name,
+            "actions_generated": len(generated_actions),
+        })
+
+    total_actions = sum(s.get("actions_generated", 0) for s in created_schedules)
+
+    return JSONResponse({
+        "success": True,
+        "schedules": created_schedules,
+        "count": len(created_schedules),
+        "actions_generated": total_actions,
+        "message": f"Created {len(created_schedules)} recurring schedule(s) with {total_actions} upcoming actions",
+    })
+
+
+# ============================================================================
+# Update
+# ============================================================================
+
+@router.put("/{schedule_id}")
+async def update_recurring_schedule(
+    project_id: str,
+    schedule_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    """
+    Update a recurring schedule.
+    """
+    schedule = db.query(RecurringSchedule).filter_by(
+        id=schedule_id,
+        project_id=project_id,
+    ).first()
+
+    if not schedule:
+        raise HTTPException(status_code=404, detail="Schedule not found")
+
+    data = await request.json()
+    service = get_recurring_schedule_service(db)
+
+    # Build update kwargs
+    update_kwargs = {}
+    for field in ["name", "weekly_pattern", "interval_type", "cycle_time",
+                  "include_download", "auto_increment_index", "timezone", "unit_id"]:
+        if field in data:
+            update_kwargs[field] = data[field]
+
+    updated = service.update_schedule(schedule_id, **update_kwargs)
+
+    return {
+        "success": True,
+        "schedule_id": updated.id,
+        "message": "Schedule updated successfully",
+    }
+
+
+# ============================================================================
+# Delete
+# ============================================================================
+
+@router.delete("/{schedule_id}")
+async def delete_recurring_schedule(
+    project_id: str,
+    schedule_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Delete a recurring schedule.
+    """
+    service = get_recurring_schedule_service(db)
+    deleted = service.delete_schedule(schedule_id)
+
+    if not deleted:
+        raise HTTPException(status_code=404, detail="Schedule not found")
+
+    return {
+        "success": True,
+        "message": "Schedule deleted successfully",
+    }
+
+
+# ============================================================================
+# Enable/Disable
+# ============================================================================
+
+@router.post("/{schedule_id}/enable")
+async def enable_schedule(
+    project_id: str,
+    schedule_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Enable a disabled schedule.
+    """
+    service = get_recurring_schedule_service(db)
+    schedule = service.enable_schedule(schedule_id)
+
+    if not schedule:
+        raise HTTPException(status_code=404, detail="Schedule not found")
+
+    return {
+        "success": True,
+        "schedule_id": schedule.id,
+        "enabled": schedule.enabled,
+        "message": "Schedule enabled",
+    }
+
+
+@router.post("/{schedule_id}/disable")
+async def disable_schedule(
+    project_id: str,
+    schedule_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Disable a schedule and cancel all its pending actions.
+    """
+    service = get_recurring_schedule_service(db)
+
+    # Count pending actions before disabling (for response message)
+    from sqlalchemy import and_
+    from backend.models import ScheduledAction
+    pending_count = db.query(ScheduledAction).filter(
+        and_(
+            ScheduledAction.execution_status == "pending",
+            ScheduledAction.notes.like(f'%"schedule_id": "{schedule_id}"%'),
+        )
+    ).count()
+
+    schedule = service.disable_schedule(schedule_id)
+
+    if not schedule:
+        raise HTTPException(status_code=404, detail="Schedule not found")
+
+    message = "Schedule disabled"
+    if pending_count > 0:
+        message += f" and {pending_count} pending action(s) cancelled"
+
+    return {
+        "success": True,
+        "schedule_id": schedule.id,
+        "enabled": schedule.enabled,
+        "cancelled_actions": pending_count,
+        "message": message,
+    }
+
+
+# ============================================================================
+# Preview Generated Actions
+# ============================================================================
+
+@router.post("/{schedule_id}/generate-preview")
+async def preview_generated_actions(
+    project_id: str,
+    schedule_id: str,
+    db: Session = Depends(get_db),
+    days: int = Query(7, ge=1, le=30),
+):
+    """
+    Preview what actions would be generated without saving them.
+    """
+    schedule = db.query(RecurringSchedule).filter_by(
+        id=schedule_id,
+        project_id=project_id,
+    ).first()
+
+    if not schedule:
+        raise HTTPException(status_code=404, detail="Schedule not found")
+
+    service = get_recurring_schedule_service(db)
+    actions = service.generate_actions_for_schedule(
+        schedule,
+        horizon_days=days,
+        preview_only=True,
+    )
+
+    return {
+        "schedule_id": schedule_id,
+        "schedule_name": schedule.name,
+        "preview_days": days,
+        "actions": [
+            {
+                "action_type": a.action_type,
+                "scheduled_time": a.scheduled_time.isoformat(),
+                "notes": a.notes,
+            }
+            for a in actions
+        ],
+        "action_count": len(actions),
+    }
+
+
+# ============================================================================
+# Manual Generation Trigger
+# ============================================================================
+
+@router.post("/{schedule_id}/generate")
+async def generate_actions_now(
+    project_id: str,
+    schedule_id: str,
+    db: Session = Depends(get_db),
+    days: int = Query(7, ge=1, le=30),
+):
+    """
+    Manually trigger action generation for a schedule.
+    """
+    schedule = db.query(RecurringSchedule).filter_by(
+        id=schedule_id,
+        project_id=project_id,
+    ).first()
+
+    if not schedule:
+        raise HTTPException(status_code=404, detail="Schedule not found")
+
+    if not schedule.enabled:
+        raise HTTPException(status_code=400, detail="Schedule is disabled")
+
+    service = get_recurring_schedule_service(db)
+    actions = service.generate_actions_for_schedule(
+        schedule,
+        horizon_days=days,
+        preview_only=False,
+    )
+
+    return {
+        "success": True,
+        "schedule_id": schedule_id,
+        "generated_count": len(actions),
+        "message": f"Generated {len(actions)} scheduled actions",
+    }
+
+
+# ============================================================================
+# HTML Partials
+# ============================================================================
+
+@router.get("/partials/list", response_class=HTMLResponse)
+async def get_schedule_list_partial(
+    project_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    """
+    Return HTML partial for schedule list.
+    """
+    project = db.query(Project).filter_by(id=project_id).first()
+    project_status = project.status if project else "active"
+
+    schedules = db.query(RecurringSchedule).filter_by(
+        project_id=project_id
+    ).order_by(RecurringSchedule.created_at.desc()).all()
+
+    # Enrich with location info
+    schedule_data = []
+    for s in schedules:
+        location = db.query(MonitoringLocation).filter_by(id=s.location_id).first()
+        schedule_data.append({
+            "schedule": s,
+            "location": location,
+            "pattern": json.loads(s.weekly_pattern) if s.weekly_pattern else None,
+        })
+
+    return templates.TemplateResponse("partials/projects/recurring_schedule_list.html", {
+        "request": request,
+        "project_id": project_id,
+        "schedules": schedule_data,
+        "project_status": project_status,
+    })

backend/routers/report_templates.py

@@ -0,0 +1,187 @@
+"""
+Report Templates Router
+
+CRUD operations for report template management.
+Templates store time filter presets and report configuration for reuse.
+"""
+
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.responses import JSONResponse
+from sqlalchemy.orm import Session
+from datetime import datetime
+from typing import Optional
+import uuid
+
+from backend.database import get_db
+from backend.models import ReportTemplate
+
+router = APIRouter(prefix="/api/report-templates", tags=["report-templates"])
+
+
+@router.get("")
+async def list_templates(
+    project_id: Optional[str] = None,
+    db: Session = Depends(get_db),
+):
+    """
+    List all report templates.
+    Optionally filter by project_id (includes global templates with project_id=None).
+    """
+    query = db.query(ReportTemplate)
+
+    if project_id:
+        # Include global templates (project_id=None) AND project-specific templates
+        query = query.filter(
+            (ReportTemplate.project_id == None) | (ReportTemplate.project_id == project_id)
+        )
+
+    templates = query.order_by(ReportTemplate.name).all()
+
+    return [
+        {
+            "id": t.id,
+            "name": t.name,
+            "project_id": t.project_id,
+            "report_title": t.report_title,
+            "start_time": t.start_time,
+            "end_time": t.end_time,
+            "start_date": t.start_date,
+            "end_date": t.end_date,
+            "created_at": t.created_at.isoformat() if t.created_at else None,
+            "updated_at": t.updated_at.isoformat() if t.updated_at else None,
+        }
+        for t in templates
+    ]
+
+
+@router.post("")
+async def create_template(
+    data: dict,
+    db: Session = Depends(get_db),
+):
+    """
+    Create a new report template.
+
+    Request body:
+    - name: Template name (required)
+    - project_id: Optional project ID for project-specific template
+    - report_title: Default report title
+    - start_time: Start time filter (HH:MM format)
+    - end_time: End time filter (HH:MM format)
+    - start_date: Start date filter (YYYY-MM-DD format)
+    - end_date: End date filter (YYYY-MM-DD format)
+    """
+    name = data.get("name")
+    if not name:
+        raise HTTPException(status_code=400, detail="Template name is required")
+
+    template = ReportTemplate(
+        id=str(uuid.uuid4()),
+        name=name,
+        project_id=data.get("project_id"),
+        report_title=data.get("report_title", "Background Noise Study"),
+        start_time=data.get("start_time"),
+        end_time=data.get("end_time"),
+        start_date=data.get("start_date"),
+        end_date=data.get("end_date"),
+    )
+
+    db.add(template)
+    db.commit()
+    db.refresh(template)
+
+    return {
+        "id": template.id,
+        "name": template.name,
+        "project_id": template.project_id,
+        "report_title": template.report_title,
+        "start_time": template.start_time,
+        "end_time": template.end_time,
+        "start_date": template.start_date,
+        "end_date": template.end_date,
+        "created_at": template.created_at.isoformat() if template.created_at else None,
+    }
+
+
+@router.get("/{template_id}")
+async def get_template(
+    template_id: str,
+    db: Session = Depends(get_db),
+):
+    """Get a specific report template by ID."""
+    template = db.query(ReportTemplate).filter_by(id=template_id).first()
+    if not template:
+        raise HTTPException(status_code=404, detail="Template not found")
+
+    return {
+        "id": template.id,
+        "name": template.name,
+        "project_id": template.project_id,
+        "report_title": template.report_title,
+        "start_time": template.start_time,
+        "end_time": template.end_time,
+        "start_date": template.start_date,
+        "end_date": template.end_date,
+        "created_at": template.created_at.isoformat() if template.created_at else None,
+        "updated_at": template.updated_at.isoformat() if template.updated_at else None,
+    }
+
+
+@router.put("/{template_id}")
+async def update_template(
+    template_id: str,
+    data: dict,
+    db: Session = Depends(get_db),
+):
+    """Update an existing report template."""
+    template = db.query(ReportTemplate).filter_by(id=template_id).first()
+    if not template:
+        raise HTTPException(status_code=404, detail="Template not found")
+
+    # Update fields if provided
+    if "name" in data:
+        template.name = data["name"]
+    if "project_id" in data:
+        template.project_id = data["project_id"]
+    if "report_title" in data:
+        template.report_title = data["report_title"]
+    if "start_time" in data:
+        template.start_time = data["start_time"]
+    if "end_time" in data:
+        template.end_time = data["end_time"]
+    if "start_date" in data:
+        template.start_date = data["start_date"]
+    if "end_date" in data:
+        template.end_date = data["end_date"]
+
+    template.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(template)
+
+    return {
+        "id": template.id,
+        "name": template.name,
+        "project_id": template.project_id,
+        "report_title": template.report_title,
+        "start_time": template.start_time,
+        "end_time": template.end_time,
+        "start_date": template.start_date,
+        "end_date": template.end_date,
+        "updated_at": template.updated_at.isoformat() if template.updated_at else None,
+    }
+
+
+@router.delete("/{template_id}")
+async def delete_template(
+    template_id: str,
+    db: Session = Depends(get_db),
+):
+    """Delete a report template."""
+    template = db.query(ReportTemplate).filter_by(id=template_id).first()
+    if not template:
+        raise HTTPException(status_code=404, detail="Template not found")
+
+    db.delete(template)
+    db.commit()
+
+    return JSONResponse({"status": "success", "message": "Template deleted"})

backend/routers/roster.py

@@ -0,0 +1,58 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+from datetime import datetime, timedelta
+from typing import Dict, Any
+import asyncio
+import logging
+import random
+
+from backend.database import get_db
+from backend.services.snapshot import emit_status_snapshot
+from backend.services.slm_status_sync import sync_slm_status_to_emitters
+
+router = APIRouter(prefix="/api", tags=["roster"])
+logger = logging.getLogger(__name__)
+
+
+@router.get("/status-snapshot")
+async def get_status_snapshot(db: Session = Depends(get_db)):
+    """
+    Calls emit_status_snapshot() to get current fleet status.
+    Syncs SLM status from SLMM before generating snapshot.
+    """
+    # Sync SLM status from SLMM (with timeout to prevent blocking)
+    try:
+        await asyncio.wait_for(sync_slm_status_to_emitters(), timeout=2.0)
+    except asyncio.TimeoutError:
+        logger.warning("SLM status sync timed out, using cached data")
+    except Exception as e:
+        logger.warning(f"SLM status sync failed: {e}")
+
+    return emit_status_snapshot()
+
+
+@router.get("/roster")
+def get_roster(db: Session = Depends(get_db)):
+    """
+    Returns list of units with their metadata and status.
+    Uses mock data for now.
+    """
+    snapshot = emit_status_snapshot()
+    units_list = []
+
+    for unit_id, unit_data in snapshot["units"].items():
+        units_list.append({
+            "id": unit_id,
+            "status": unit_data["status"],
+            "age": unit_data["age"],
+            "last_seen": unit_data["last"],
+            "deployed": unit_data["deployed"],
+            "note": unit_data.get("note", ""),
+            "last_file": unit_data.get("fname", "")
+        })
+
+    # Sort by status priority (Missing > Pending > OK) then by ID
+    status_priority = {"Missing": 0, "Pending": 1, "OK": 2}
+    units_list.sort(key=lambda x: (status_priority.get(x["status"], 3), x["id"]))
+
+    return {"units": units_list}

backend/routers/roster_rename.py

@@ -0,0 +1,139 @@
+"""
+Roster Unit Rename Router
+
+Provides endpoint for safely renaming unit IDs across all database tables.
+"""
+
+from fastapi import APIRouter, Depends, HTTPException, Form
+from sqlalchemy.orm import Session
+from datetime import datetime
+import logging
+
+from backend.database import get_db
+from backend.models import RosterUnit, Emitter, UnitHistory
+from backend.routers.roster_edit import record_history, sync_slm_to_slmm_cache
+
+router = APIRouter(prefix="/api/roster", tags=["roster-rename"])
+logger = logging.getLogger(__name__)
+
+
+@router.post("/rename")
+async def rename_unit(
+    old_id: str = Form(...),
+    new_id: str = Form(...),
+    db: Session = Depends(get_db)
+):
+    """
+    Rename a unit ID across all tables.
+    Updates the unit ID in roster, emitters, unit_history, and all foreign key references.
+
+    IMPORTANT: This operation updates the primary key, which affects all relationships.
+    """
+    # Validate input
+    if not old_id or not new_id:
+        raise HTTPException(status_code=400, detail="Both old_id and new_id are required")
+
+    if old_id == new_id:
+        raise HTTPException(status_code=400, detail="New ID must be different from old ID")
+
+    # Check if old unit exists
+    old_unit = db.query(RosterUnit).filter(RosterUnit.id == old_id).first()
+    if not old_unit:
+        raise HTTPException(status_code=404, detail=f"Unit '{old_id}' not found")
+
+    # Check if new ID already exists
+    existing_unit = db.query(RosterUnit).filter(RosterUnit.id == new_id).first()
+    if existing_unit:
+        raise HTTPException(status_code=409, detail=f"Unit ID '{new_id}' already exists")
+
+    device_type = old_unit.device_type
+
+    try:
+        # Record history for the rename operation (using old_id since that's still valid)
+        record_history(
+            db=db,
+            unit_id=old_id,
+            change_type="id_change",
+            field_name="id",
+            old_value=old_id,
+            new_value=new_id,
+            source="manual",
+            notes=f"Unit renamed from '{old_id}' to '{new_id}'"
+        )
+
+        # Update roster table (primary)
+        old_unit.id = new_id
+        old_unit.last_updated = datetime.utcnow()
+
+        # Update emitters table
+        emitter = db.query(Emitter).filter(Emitter.id == old_id).first()
+        if emitter:
+            emitter.id = new_id
+
+        # Update unit_history table (all entries for this unit)
+        db.query(UnitHistory).filter(UnitHistory.unit_id == old_id).update(
+            {"unit_id": new_id},
+            synchronize_session=False
+        )
+
+        # Update deployed_with_modem_id references (units that reference this as modem)
+        db.query(RosterUnit).filter(RosterUnit.deployed_with_modem_id == old_id).update(
+            {"deployed_with_modem_id": new_id},
+            synchronize_session=False
+        )
+
+        # Update unit_assignments table (if exists)
+        try:
+            from backend.models import UnitAssignment
+            db.query(UnitAssignment).filter(UnitAssignment.unit_id == old_id).update(
+                {"unit_id": new_id},
+                synchronize_session=False
+            )
+        except Exception as e:
+            logger.warning(f"Could not update unit_assignments: {e}")
+
+        # Update monitoring_sessions table (if exists)
+        try:
+            from backend.models import MonitoringSession
+            db.query(MonitoringSession).filter(MonitoringSession.unit_id == old_id).update(
+                {"unit_id": new_id},
+                synchronize_session=False
+            )
+        except Exception as e:
+            logger.warning(f"Could not update monitoring_sessions: {e}")
+
+        # Commit all changes
+        db.commit()
+
+        # If sound level meter, sync updated config to SLMM cache
+        if device_type == "slm":
+            logger.info(f"Syncing renamed SLM {new_id} (was {old_id}) config to SLMM cache...")
+            result = await sync_slm_to_slmm_cache(
+                unit_id=new_id,
+                host=old_unit.slm_host,
+                tcp_port=old_unit.slm_tcp_port,
+                ftp_port=old_unit.slm_ftp_port,
+                deployed_with_modem_id=old_unit.deployed_with_modem_id,
+                db=db
+            )
+
+            if not result["success"]:
+                logger.warning(f"SLMM cache sync warning for renamed unit {new_id}: {result['message']}")
+
+        logger.info(f"Successfully renamed unit '{old_id}' to '{new_id}'")
+
+        return {
+            "success": True,
+            "message": f"Successfully renamed unit from '{old_id}' to '{new_id}'",
+            "old_id": old_id,
+            "new_id": new_id,
+            "device_type": device_type
+        }
+
+    except Exception as e:
+        db.rollback()
+        logger.error(f"Error renaming unit '{old_id}' to '{new_id}': {e}")
+        raise HTTPException(
+            status_code=500,
+            detail=f"Failed to rename unit: {str(e)}"
+        )

backend/routers/scheduler.py

@@ -0,0 +1,408 @@
+"""
+Scheduler Router
+
+Handles scheduled actions for automated recording control.
+"""
+
+from fastapi import APIRouter, Request, Depends, HTTPException, Query
+from fastapi.responses import HTMLResponse, JSONResponse
+from sqlalchemy.orm import Session
+from sqlalchemy import and_, or_
+from datetime import datetime, timedelta
+from typing import Optional
+import uuid
+import json
+
+from backend.database import get_db
+from backend.models import (
+    Project,
+    ScheduledAction,
+    MonitoringLocation,
+    UnitAssignment,
+    RosterUnit,
+)
+from backend.services.scheduler import get_scheduler
+from backend.templates_config import templates
+
+router = APIRouter(prefix="/api/projects/{project_id}/scheduler", tags=["scheduler"])
+
+
+# ============================================================================
+# Scheduled Actions List
+# ============================================================================
+
+@router.get("/actions", response_class=HTMLResponse)
+async def get_scheduled_actions(
+    project_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+    status: Optional[str] = Query(None),
+    start_date: Optional[str] = Query(None),
+    end_date: Optional[str] = Query(None),
+):
+    """
+    Get scheduled actions for a project.
+    Returns HTML partial with agenda/calendar view.
+    """
+    query = db.query(ScheduledAction).filter_by(project_id=project_id)
+
+    # Filter by status
+    if status:
+        query = query.filter_by(execution_status=status)
+    else:
+        # By default, show pending and upcoming completed/failed
+        query = query.filter(
+            or_(
+                ScheduledAction.execution_status == "pending",
+                and_(
+                    ScheduledAction.execution_status.in_(["completed", "failed"]),
+                    ScheduledAction.scheduled_time >= datetime.utcnow() - timedelta(days=7),
+                ),
+            )
+        )
+
+    # Filter by date range
+    if start_date:
+        query = query.filter(ScheduledAction.scheduled_time >= datetime.fromisoformat(start_date))
+    if end_date:
+        query = query.filter(ScheduledAction.scheduled_time <= datetime.fromisoformat(end_date))
+
+    actions = query.order_by(ScheduledAction.scheduled_time).all()
+
+    # Enrich with location and unit details
+    actions_data = []
+    for action in actions:
+        location = db.query(MonitoringLocation).filter_by(id=action.location_id).first()
+
+        unit = None
+        if action.unit_id:
+            unit = db.query(RosterUnit).filter_by(id=action.unit_id).first()
+        else:
+            # Get from assignment
+            assignment = db.query(UnitAssignment).filter(
+                and_(
+                    UnitAssignment.location_id == action.location_id,
+                    UnitAssignment.status == "active",
+                )
+            ).first()
+            if assignment:
+                unit = db.query(RosterUnit).filter_by(id=assignment.unit_id).first()
+
+        actions_data.append({
+            "action": action,
+            "location": location,
+            "unit": unit,
+        })
+
+    return templates.TemplateResponse("partials/projects/scheduler_agenda.html", {
+        "request": request,
+        "project_id": project_id,
+        "actions": actions_data,
+    })
+
+
+# ============================================================================
+# Create Scheduled Action
+# ============================================================================
+
+@router.post("/actions/create")
+async def create_scheduled_action(
+    project_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    """
+    Create a new scheduled action.
+    """
+    project = db.query(Project).filter_by(id=project_id).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    form_data = await request.form()
+
+    location_id = form_data.get("location_id")
+    location = db.query(MonitoringLocation).filter_by(
+        id=location_id,
+        project_id=project_id,
+    ).first()
+
+    if not location:
+        raise HTTPException(status_code=404, detail="Location not found")
+
+    # Determine device type from location
+    device_type = "slm" if location.location_type == "sound" else "seismograph"
+
+    # Get unit_id (optional - can be determined from assignment at execution time)
+    unit_id = form_data.get("unit_id")
+
+    action = ScheduledAction(
+        id=str(uuid.uuid4()),
+        project_id=project_id,
+        location_id=location_id,
+        unit_id=unit_id,
+        action_type=form_data.get("action_type"),
+        device_type=device_type,
+        scheduled_time=datetime.fromisoformat(form_data.get("scheduled_time")),
+        execution_status="pending",
+        notes=form_data.get("notes"),
+    )
+
+    db.add(action)
+    db.commit()
+    db.refresh(action)
+
+    return JSONResponse({
+        "success": True,
+        "action_id": action.id,
+        "message": f"Scheduled action '{action.action_type}' created for {action.scheduled_time}",
+    })
+
+
+# ============================================================================
+# Schedule Recording Session
+# ============================================================================
+
+@router.post("/schedule-session")
+async def schedule_recording_session(
+    project_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    """
+    Schedule a complete recording session (start + stop).
+    Creates two scheduled actions: start and stop.
+    """
+    project = db.query(Project).filter_by(id=project_id).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    form_data = await request.form()
+
+    location_id = form_data.get("location_id")
+    location = db.query(MonitoringLocation).filter_by(
+        id=location_id,
+        project_id=project_id,
+    ).first()
+
+    if not location:
+        raise HTTPException(status_code=404, detail="Location not found")
+
+    device_type = "slm" if location.location_type == "sound" else "seismograph"
+    unit_id = form_data.get("unit_id")
+
+    start_time = datetime.fromisoformat(form_data.get("start_time"))
+    duration_minutes = int(form_data.get("duration_minutes", 60))
+    stop_time = start_time + timedelta(minutes=duration_minutes)
+
+    # Create START action
+    start_action = ScheduledAction(
+        id=str(uuid.uuid4()),
+        project_id=project_id,
+        location_id=location_id,
+        unit_id=unit_id,
+        action_type="start",
+        device_type=device_type,
+        scheduled_time=start_time,
+        execution_status="pending",
+        notes=form_data.get("notes"),
+    )
+
+    # Create STOP action
+    stop_action = ScheduledAction(
+        id=str(uuid.uuid4()),
+        project_id=project_id,
+        location_id=location_id,
+        unit_id=unit_id,
+        action_type="stop",
+        device_type=device_type,
+        scheduled_time=stop_time,
+        execution_status="pending",
+        notes=f"Auto-stop after {duration_minutes} minutes",
+    )
+
+    db.add(start_action)
+    db.add(stop_action)
+    db.commit()
+
+    return JSONResponse({
+        "success": True,
+        "start_action_id": start_action.id,
+        "stop_action_id": stop_action.id,
+        "message": f"Recording session scheduled from {start_time} to {stop_time}",
+    })
+
+
+# ============================================================================
+# Update/Cancel Scheduled Action
+# ============================================================================
+
+@router.put("/actions/{action_id}")
+async def update_scheduled_action(
+    project_id: str,
+    action_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    """
+    Update a scheduled action (only if not yet executed).
+    """
+    action = db.query(ScheduledAction).filter_by(
+        id=action_id,
+        project_id=project_id,
+    ).first()
+
+    if not action:
+        raise HTTPException(status_code=404, detail="Action not found")
+
+    if action.execution_status != "pending":
+        raise HTTPException(
+            status_code=400,
+            detail="Cannot update action that has already been executed",
+        )
+
+    data = await request.json()
+
+    if "scheduled_time" in data:
+        action.scheduled_time = datetime.fromisoformat(data["scheduled_time"])
+    if "notes" in data:
+        action.notes = data["notes"]
+
+    db.commit()
+
+    return {"success": True, "message": "Action updated successfully"}
+
+
+@router.post("/actions/{action_id}/cancel")
+async def cancel_scheduled_action(
+    project_id: str,
+    action_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Cancel a pending scheduled action.
+    """
+    action = db.query(ScheduledAction).filter_by(
+        id=action_id,
+        project_id=project_id,
+    ).first()
+
+    if not action:
+        raise HTTPException(status_code=404, detail="Action not found")
+
+    if action.execution_status != "pending":
+        raise HTTPException(
+            status_code=400,
+            detail="Can only cancel pending actions",
+        )
+
+    action.execution_status = "cancelled"
+    db.commit()
+
+    return {"success": True, "message": "Action cancelled successfully"}
+
+
+@router.delete("/actions/{action_id}")
+async def delete_scheduled_action(
+    project_id: str,
+    action_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Delete a scheduled action (only if pending or cancelled).
+    """
+    action = db.query(ScheduledAction).filter_by(
+        id=action_id,
+        project_id=project_id,
+    ).first()
+
+    if not action:
+        raise HTTPException(status_code=404, detail="Action not found")
+
+    if action.execution_status not in ["pending", "cancelled"]:
+        raise HTTPException(
+            status_code=400,
+            detail="Cannot delete action that has been executed",
+        )
+
+    db.delete(action)
+    db.commit()
+
+    return {"success": True, "message": "Action deleted successfully"}
+
+
+# ============================================================================
+# Manual Execution
+# ============================================================================
+
+@router.post("/actions/{action_id}/execute")
+async def execute_action_now(
+    project_id: str,
+    action_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Manually trigger execution of a scheduled action (for testing/debugging).
+    """
+    action = db.query(ScheduledAction).filter_by(
+        id=action_id,
+        project_id=project_id,
+    ).first()
+
+    if not action:
+        raise HTTPException(status_code=404, detail="Action not found")
+
+    if action.execution_status != "pending":
+        raise HTTPException(
+            status_code=400,
+            detail="Action is not pending",
+        )
+
+    # Execute via scheduler service
+    scheduler = get_scheduler()
+    result = await scheduler.execute_action_by_id(action_id)
+
+    # Refresh from DB to get updated status
+    db.refresh(action)
+
+    return JSONResponse({
+        "success": result.get("success", False),
+        "result": result,
+        "action": {
+            "id": action.id,
+            "execution_status": action.execution_status,
+            "executed_at": action.executed_at.isoformat() if action.executed_at else None,
+            "error_message": action.error_message,
+        },
+    })
+
+
+# ============================================================================
+# Scheduler Status
+# ============================================================================
+
+@router.get("/status")
+async def get_scheduler_status():
+    """
+    Get scheduler service status.
+    """
+    scheduler = get_scheduler()
+
+    return {
+        "running": scheduler.running,
+        "check_interval": scheduler.check_interval,
+    }
+
+
+@router.post("/execute-pending")
+async def trigger_pending_execution():
+    """
+    Manually trigger execution of all pending actions (for testing).
+    """
+    scheduler = get_scheduler()
+    results = await scheduler.execute_pending_actions()
+
+    return {
+        "success": True,
+        "executed_count": len(results),
+        "results": results,
+    }

backend/routers/seismo_dashboard.py

@@ -0,0 +1,228 @@
+"""
+Seismograph Dashboard API Router
+Provides endpoints for the seismograph-specific dashboard
+"""
+
+from datetime import date, datetime, timedelta
+
+from fastapi import APIRouter, Request, Depends, Query, Form, HTTPException
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+from backend.database import get_db
+from backend.models import RosterUnit, UnitHistory, UserPreferences
+from backend.templates_config import templates
+
+router = APIRouter(prefix="/api/seismo-dashboard", tags=["seismo-dashboard"])
+
+
+@router.get("/stats", response_class=HTMLResponse)
+async def get_seismo_stats(request: Request, db: Session = Depends(get_db)):
+    """
+    Returns HTML partial with seismograph statistics summary
+    """
+    # Get all seismograph units
+    seismos = db.query(RosterUnit).filter_by(
+        device_type="seismograph",
+        retired=False
+    ).all()
+
+    total = len(seismos)
+    deployed = sum(1 for s in seismos if s.deployed)
+    benched = sum(1 for s in seismos if not s.deployed and not s.out_for_calibration)
+    out_for_calibration = sum(1 for s in seismos if s.out_for_calibration)
+
+    # Count modems assigned to deployed seismographs
+    with_modem = sum(1 for s in seismos if s.deployed and s.deployed_with_modem_id)
+    without_modem = deployed - with_modem
+
+    return templates.TemplateResponse(
+        "partials/seismo_stats.html",
+        {
+            "request": request,
+            "total": total,
+            "deployed": deployed,
+            "benched": benched,
+            "out_for_calibration": out_for_calibration,
+            "with_modem": with_modem,
+            "without_modem": without_modem
+        }
+    )
+
+
+@router.get("/units", response_class=HTMLResponse)
+async def get_seismo_units(
+    request: Request,
+    db: Session = Depends(get_db),
+    search: str = Query(None),
+    sort: str = Query("id"),
+    order: str = Query("asc"),
+    status: str = Query(None),
+    modem: str = Query(None)
+):
+    """
+    Returns HTML partial with filterable and sortable seismograph unit list
+    """
+    query = db.query(RosterUnit).filter_by(
+        device_type="seismograph",
+        retired=False
+    )
+
+    # Apply search filter
+    if search:
+        query = query.filter(
+            (RosterUnit.id.ilike(f"%{search}%")) |
+            (RosterUnit.note.ilike(f"%{search}%")) |
+            (RosterUnit.address.ilike(f"%{search}%"))
+        )
+
+    # Apply status filter
+    if status == "deployed":
+        query = query.filter(RosterUnit.deployed == True)
+    elif status == "benched":
+        query = query.filter(RosterUnit.deployed == False, RosterUnit.out_for_calibration == False)
+    elif status == "out_for_calibration":
+        query = query.filter(RosterUnit.out_for_calibration == True)
+
+    # Apply modem filter
+    if modem == "with":
+        query = query.filter(RosterUnit.deployed_with_modem_id.isnot(None))
+    elif modem == "without":
+        query = query.filter(RosterUnit.deployed_with_modem_id.is_(None))
+
+    # Apply sorting
+    sort_column_map = {
+        "id": RosterUnit.id,
+        "status": RosterUnit.deployed,
+        "modem": RosterUnit.deployed_with_modem_id,
+        "location": RosterUnit.address,
+        "last_calibrated": RosterUnit.last_calibrated,
+        "notes": RosterUnit.note
+    }
+    sort_column = sort_column_map.get(sort, RosterUnit.id)
+
+    if order == "desc":
+        query = query.order_by(sort_column.desc())
+    else:
+        query = query.order_by(sort_column.asc())
+
+    seismos = query.all()
+
+    return templates.TemplateResponse(
+        "partials/seismo_unit_list.html",
+        {
+            "request": request,
+            "units": seismos,
+            "search": search or "",
+            "sort": sort,
+            "order": order,
+            "status": status or "",
+            "modem": modem or "",
+            "today": date.today()
+        }
+    )
+
+
+def _get_calibration_interval(db: Session) -> int:
+    prefs = db.query(UserPreferences).first()
+    if prefs and prefs.calibration_interval_days:
+        return prefs.calibration_interval_days
+    return 365
+
+
+def _row_context(request: Request, unit: RosterUnit) -> dict:
+    return {"request": request, "unit": unit, "today": date.today()}
+
+
+@router.get("/unit/{unit_id}/view-row", response_class=HTMLResponse)
+async def get_seismo_view_row(unit_id: str, request: Request, db: Session = Depends(get_db)):
+    unit = db.query(RosterUnit).filter(RosterUnit.id == unit_id).first()
+    if not unit:
+        raise HTTPException(status_code=404, detail="Unit not found")
+    return templates.TemplateResponse("partials/seismo_row_view.html", _row_context(request, unit))
+
+
+@router.get("/unit/{unit_id}/edit-row", response_class=HTMLResponse)
+async def get_seismo_edit_row(unit_id: str, request: Request, db: Session = Depends(get_db)):
+    unit = db.query(RosterUnit).filter(RosterUnit.id == unit_id).first()
+    if not unit:
+        raise HTTPException(status_code=404, detail="Unit not found")
+    return templates.TemplateResponse("partials/seismo_row_edit.html", _row_context(request, unit))
+
+
+@router.post("/unit/{unit_id}/quick-update", response_class=HTMLResponse)
+async def quick_update_seismo_unit(
+    unit_id: str,
+    request: Request,
+    db: Session = Depends(get_db),
+    status: str = Form(...),
+    last_calibrated: str = Form(""),
+    note: str = Form(""),
+):
+    unit = db.query(RosterUnit).filter(RosterUnit.id == unit_id).first()
+    if not unit:
+        raise HTTPException(status_code=404, detail="Unit not found")
+
+    # --- Status ---
+    old_deployed = unit.deployed
+    old_out_for_cal = unit.out_for_calibration
+    if status == "deployed":
+        unit.deployed = True
+        unit.out_for_calibration = False
+    elif status == "out_for_calibration":
+        unit.deployed = False
+        unit.out_for_calibration = True
+    else:
+        unit.deployed = False
+        unit.out_for_calibration = False
+
+    if unit.deployed != old_deployed or unit.out_for_calibration != old_out_for_cal:
+        old_status = "deployed" if old_deployed else ("out_for_calibration" if old_out_for_cal else "benched")
+        db.add(UnitHistory(
+            unit_id=unit_id,
+            change_type="deployed_change",
+            field_name="status",
+            old_value=old_status,
+            new_value=status,
+            source="manual",
+        ))
+
+    # --- Last calibrated ---
+    old_cal = unit.last_calibrated
+    if last_calibrated:
+        try:
+            new_cal = datetime.strptime(last_calibrated, "%Y-%m-%d").date()
+        except ValueError:
+            raise HTTPException(status_code=400, detail="Invalid date format. Use YYYY-MM-DD")
+        unit.last_calibrated = new_cal
+        unit.next_calibration_due = new_cal + timedelta(days=_get_calibration_interval(db))
+    else:
+        unit.last_calibrated = None
+        unit.next_calibration_due = None
+
+    if unit.last_calibrated != old_cal:
+        db.add(UnitHistory(
+            unit_id=unit_id,
+            change_type="calibration_status_change",
+            field_name="last_calibrated",
+            old_value=old_cal.strftime("%Y-%m-%d") if old_cal else None,
+            new_value=last_calibrated or None,
+            source="manual",
+        ))
+
+    # --- Note ---
+    old_note = unit.note
+    unit.note = note or None
+    if unit.note != old_note:
+        db.add(UnitHistory(
+            unit_id=unit_id,
+            change_type="note_change",
+            field_name="note",
+            old_value=old_note,
+            new_value=unit.note,
+            source="manual",
+        ))
+
+    db.commit()
+    db.refresh(unit)
+
+    return templates.TemplateResponse("partials/seismo_row_view.html", _row_context(request, unit))

backend/routers/settings.py

@@ -0,0 +1,551 @@
+from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
+from fastapi.responses import StreamingResponse, FileResponse
+from sqlalchemy.orm import Session
+from datetime import datetime, date
+from pydantic import BaseModel
+from typing import Optional
+import csv
+import io
+import shutil
+from pathlib import Path
+
+from backend.database import get_db
+from backend.models import RosterUnit, Emitter, IgnoredUnit, UserPreferences
+from backend.services.database_backup import DatabaseBackupService
+
+router = APIRouter(prefix="/api/settings", tags=["settings"])
+
+
+@router.get("/export-csv")
+def export_roster_csv(db: Session = Depends(get_db)):
+    """Export all roster units to CSV"""
+    units = db.query(RosterUnit).all()
+
+    # Create CSV in memory
+    output = io.StringIO()
+    fieldnames = [
+        'unit_id', 'unit_type', 'device_type', 'deployed', 'retired',
+        'note', 'project_id', 'location', 'address', 'coordinates',
+        'last_calibrated', 'next_calibration_due', 'deployed_with_modem_id',
+        'ip_address', 'phone_number', 'hardware_model'
+    ]
+
+    writer = csv.DictWriter(output, fieldnames=fieldnames)
+    writer.writeheader()
+
+    for unit in units:
+        writer.writerow({
+            'unit_id': unit.id,
+            'unit_type': unit.unit_type or '',
+            'device_type': unit.device_type or 'seismograph',
+            'deployed': 'true' if unit.deployed else 'false',
+            'retired': 'true' if unit.retired else 'false',
+            'note': unit.note or '',
+            'project_id': unit.project_id or '',
+            'location': unit.location or '',
+            'address': unit.address or '',
+            'coordinates': unit.coordinates or '',
+            'last_calibrated': unit.last_calibrated.strftime('%Y-%m-%d') if unit.last_calibrated else '',
+            'next_calibration_due': unit.next_calibration_due.strftime('%Y-%m-%d') if unit.next_calibration_due else '',
+            'deployed_with_modem_id': unit.deployed_with_modem_id or '',
+            'ip_address': unit.ip_address or '',
+            'phone_number': unit.phone_number or '',
+            'hardware_model': unit.hardware_model or ''
+        })
+
+    output.seek(0)
+    filename = f"roster_export_{date.today().isoformat()}.csv"
+
+    return StreamingResponse(
+        io.BytesIO(output.getvalue().encode('utf-8')),
+        media_type="text/csv",
+        headers={"Content-Disposition": f"attachment; filename={filename}"}
+    )
+
+
+@router.get("/stats")
+def get_table_stats(db: Session = Depends(get_db)):
+    """Get counts for all tables"""
+    roster_count = db.query(RosterUnit).count()
+    emitters_count = db.query(Emitter).count()
+    ignored_count = db.query(IgnoredUnit).count()
+
+    return {
+        "roster": roster_count,
+        "emitters": emitters_count,
+        "ignored": ignored_count,
+        "total": roster_count + emitters_count + ignored_count
+    }
+
+
+@router.get("/roster-units")
+def get_all_roster_units(db: Session = Depends(get_db)):
+    """Get all roster units for management table"""
+    units = db.query(RosterUnit).order_by(RosterUnit.id).all()
+
+    return [{
+        "id": unit.id,
+        "device_type": unit.device_type or "seismograph",
+        "unit_type": unit.unit_type or "series3",
+        "deployed": unit.deployed,
+        "retired": unit.retired,
+        "note": unit.note or "",
+        "project_id": unit.project_id or "",
+        "location": unit.location or "",
+        "address": unit.address or "",
+        "coordinates": unit.coordinates or "",
+        "last_calibrated": unit.last_calibrated.isoformat() if unit.last_calibrated else None,
+        "next_calibration_due": unit.next_calibration_due.isoformat() if unit.next_calibration_due else None,
+        "deployed_with_modem_id": unit.deployed_with_modem_id or "",
+        "ip_address": unit.ip_address or "",
+        "phone_number": unit.phone_number or "",
+        "hardware_model": unit.hardware_model or "",
+        "slm_host": unit.slm_host or "",
+        "slm_tcp_port": unit.slm_tcp_port,
+        "slm_model": unit.slm_model or "",
+        "slm_serial_number": unit.slm_serial_number or "",
+        "slm_frequency_weighting": unit.slm_frequency_weighting or "",
+        "slm_time_weighting": unit.slm_time_weighting or "",
+        "slm_measurement_range": unit.slm_measurement_range or "",
+        "slm_last_check": unit.slm_last_check.isoformat() if unit.slm_last_check else None,
+        "last_updated": unit.last_updated.isoformat() if unit.last_updated else None
+    } for unit in units]
+
+
+def parse_date(date_str):
+    """Helper function to parse date strings"""
+    if not date_str or not date_str.strip():
+        return None
+    try:
+        return datetime.strptime(date_str.strip(), "%Y-%m-%d").date()
+    except ValueError:
+        return None
+
+
+@router.post("/import-csv-replace")
+async def import_csv_replace(
+    file: UploadFile = File(...),
+    db: Session = Depends(get_db)
+):
+    """
+    Replace all roster data with CSV import (atomic transaction).
+    Clears roster table first, then imports all rows from CSV.
+    """
+
+    if not file.filename.endswith('.csv'):
+        raise HTTPException(status_code=400, detail="File must be a CSV")
+
+    # Read and parse CSV
+    contents = await file.read()
+    csv_text = contents.decode('utf-8')
+    csv_reader = csv.DictReader(io.StringIO(csv_text))
+
+    # Parse all rows FIRST (fail fast before deletion)
+    parsed_units = []
+    for row_num, row in enumerate(csv_reader, start=2):
+        unit_id = row.get('unit_id', '').strip()
+        if not unit_id:
+            raise HTTPException(
+                status_code=400,
+                detail=f"Row {row_num}: Missing required field unit_id"
+            )
+
+        # Parse and validate dates
+        last_cal_date = parse_date(row.get('last_calibrated'))
+        next_cal_date = parse_date(row.get('next_calibration_due'))
+
+        parsed_units.append({
+            'id': unit_id,
+            'unit_type': row.get('unit_type', 'series3'),
+            'device_type': row.get('device_type', 'seismograph'),
+            'deployed': row.get('deployed', '').lower() in ('true', '1', 'yes'),
+            'retired': row.get('retired', '').lower() in ('true', '1', 'yes'),
+            'note': row.get('note', ''),
+            'project_id': row.get('project_id') or None,
+            'location': row.get('location') or None,
+            'address': row.get('address') or None,
+            'coordinates': row.get('coordinates') or None,
+            'last_calibrated': last_cal_date,
+            'next_calibration_due': next_cal_date,
+            'deployed_with_modem_id': row.get('deployed_with_modem_id') or None,
+            'ip_address': row.get('ip_address') or None,
+            'phone_number': row.get('phone_number') or None,
+            'hardware_model': row.get('hardware_model') or None,
+        })
+
+    # Atomic transaction: delete all, then insert all
+    try:
+        deleted_count = db.query(RosterUnit).delete()
+
+        for unit_data in parsed_units:
+            new_unit = RosterUnit(**unit_data, last_updated=datetime.utcnow())
+            db.add(new_unit)
+
+        db.commit()
+
+        return {
+            "message": "Roster replaced successfully",
+            "deleted": deleted_count,
+            "added": len(parsed_units)
+        }
+
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=500, detail=f"Import failed: {str(e)}")
+
+
+@router.post("/clear-all")
+def clear_all_data(db: Session = Depends(get_db)):
+    """Clear all tables (roster, emitters, ignored)"""
+    try:
+        roster_count = db.query(RosterUnit).delete()
+        emitters_count = db.query(Emitter).delete()
+        ignored_count = db.query(IgnoredUnit).delete()
+
+        db.commit()
+
+        return {
+            "message": "All data cleared",
+            "deleted": {
+                "roster": roster_count,
+                "emitters": emitters_count,
+                "ignored": ignored_count,
+                "total": roster_count + emitters_count + ignored_count
+            }
+        }
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=500, detail=f"Clear failed: {str(e)}")
+
+
+@router.post("/clear-roster")
+def clear_roster(db: Session = Depends(get_db)):
+    """Clear roster table only"""
+    try:
+        count = db.query(RosterUnit).delete()
+        db.commit()
+        return {"message": "Roster cleared", "deleted": count}
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=500, detail=f"Clear failed: {str(e)}")
+
+
+@router.post("/clear-emitters")
+def clear_emitters(db: Session = Depends(get_db)):
+    """Clear emitters table only"""
+    try:
+        count = db.query(Emitter).delete()
+        db.commit()
+        return {"message": "Emitters cleared", "deleted": count}
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=500, detail=f"Clear failed: {str(e)}")
+
+
+@router.post("/clear-ignored")
+def clear_ignored(db: Session = Depends(get_db)):
+    """Clear ignored units table only"""
+    try:
+        count = db.query(IgnoredUnit).delete()
+        db.commit()
+        return {"message": "Ignored units cleared", "deleted": count}
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=500, detail=f"Clear failed: {str(e)}")
+
+
+# User Preferences Endpoints
+
+class PreferencesUpdate(BaseModel):
+    """Schema for updating user preferences (all fields optional)"""
+    timezone: Optional[str] = None
+    theme: Optional[str] = None
+    auto_refresh_interval: Optional[int] = None
+    date_format: Optional[str] = None
+    table_rows_per_page: Optional[int] = None
+    calibration_interval_days: Optional[int] = None
+    calibration_warning_days: Optional[int] = None
+    status_ok_threshold_hours: Optional[int] = None
+    status_pending_threshold_hours: Optional[int] = None
+
+
+@router.get("/preferences")
+def get_preferences(db: Session = Depends(get_db)):
+    """
+    Get user preferences. Creates default preferences if none exist.
+    """
+    prefs = db.query(UserPreferences).filter(UserPreferences.id == 1).first()
+
+    if not prefs:
+        # Create default preferences
+        prefs = UserPreferences(id=1)
+        db.add(prefs)
+        db.commit()
+        db.refresh(prefs)
+
+    return {
+        "timezone": prefs.timezone,
+        "theme": prefs.theme,
+        "auto_refresh_interval": prefs.auto_refresh_interval,
+        "date_format": prefs.date_format,
+        "table_rows_per_page": prefs.table_rows_per_page,
+        "calibration_interval_days": prefs.calibration_interval_days,
+        "calibration_warning_days": prefs.calibration_warning_days,
+        "status_ok_threshold_hours": prefs.status_ok_threshold_hours,
+        "status_pending_threshold_hours": prefs.status_pending_threshold_hours,
+        "updated_at": prefs.updated_at.isoformat() if prefs.updated_at else None
+    }
+
+
+@router.put("/preferences")
+def update_preferences(
+    updates: PreferencesUpdate,
+    db: Session = Depends(get_db)
+):
+    """
+    Update user preferences. Accepts partial updates.
+    Creates default preferences if none exist.
+    """
+    prefs = db.query(UserPreferences).filter(UserPreferences.id == 1).first()
+
+    if not prefs:
+        # Create default preferences
+        prefs = UserPreferences(id=1)
+        db.add(prefs)
+
+    # Update only provided fields
+    update_data = updates.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(prefs, field, value)
+
+    prefs.updated_at = datetime.utcnow()
+
+    db.commit()
+    db.refresh(prefs)
+
+    return {
+        "message": "Preferences updated successfully",
+        "timezone": prefs.timezone,
+        "theme": prefs.theme,
+        "auto_refresh_interval": prefs.auto_refresh_interval,
+        "date_format": prefs.date_format,
+        "table_rows_per_page": prefs.table_rows_per_page,
+        "calibration_interval_days": prefs.calibration_interval_days,
+        "calibration_warning_days": prefs.calibration_warning_days,
+        "status_ok_threshold_hours": prefs.status_ok_threshold_hours,
+        "status_pending_threshold_hours": prefs.status_pending_threshold_hours,
+        "updated_at": prefs.updated_at.isoformat() if prefs.updated_at else None
+    }
+
+
+# Database Management Endpoints
+
+backup_service = DatabaseBackupService()
+
+
+@router.get("/database/stats")
+def get_database_stats():
+    """Get current database statistics"""
+    try:
+        stats = backup_service.get_database_stats()
+        return stats
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Failed to get database stats: {str(e)}")
+
+
+@router.post("/database/snapshot")
+def create_database_snapshot(description: Optional[str] = None):
+    """Create a full database snapshot"""
+    try:
+        snapshot = backup_service.create_snapshot(description=description)
+        return {
+            "message": "Snapshot created successfully",
+            "snapshot": snapshot
+        }
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Snapshot creation failed: {str(e)}")
+
+
+@router.get("/database/snapshots")
+def list_database_snapshots():
+    """List all available database snapshots"""
+    try:
+        snapshots = backup_service.list_snapshots()
+        return {
+            "snapshots": snapshots,
+            "count": len(snapshots)
+        }
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Failed to list snapshots: {str(e)}")
+
+
+@router.get("/database/snapshot/{filename}")
+def download_snapshot(filename: str):
+    """Download a specific snapshot file"""
+    try:
+        snapshot_path = backup_service.download_snapshot(filename)
+        return FileResponse(
+            path=str(snapshot_path),
+            filename=filename,
+            media_type="application/x-sqlite3"
+        )
+    except FileNotFoundError:
+        raise HTTPException(status_code=404, detail=f"Snapshot {filename} not found")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Download failed: {str(e)}")
+
+
+@router.delete("/database/snapshot/{filename}")
+def delete_database_snapshot(filename: str):
+    """Delete a specific snapshot"""
+    try:
+        backup_service.delete_snapshot(filename)
+        return {
+            "message": f"Snapshot {filename} deleted successfully",
+            "filename": filename
+        }
+    except FileNotFoundError:
+        raise HTTPException(status_code=404, detail=f"Snapshot {filename} not found")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Delete failed: {str(e)}")
+
+
+class RestoreRequest(BaseModel):
+    """Schema for restore request"""
+    filename: str
+    create_backup: bool = True
+
+
+@router.post("/database/restore")
+def restore_database(request: RestoreRequest, db: Session = Depends(get_db)):
+    """Restore database from a snapshot"""
+    try:
+        # Close the database connection before restoring
+        db.close()
+
+        result = backup_service.restore_snapshot(
+            filename=request.filename,
+            create_backup_before_restore=request.create_backup
+        )
+
+        return result
+    except FileNotFoundError:
+        raise HTTPException(status_code=404, detail=f"Snapshot {request.filename} not found")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Restore failed: {str(e)}")
+
+
+@router.post("/database/upload-snapshot")
+async def upload_snapshot(file: UploadFile = File(...)):
+    """Upload a snapshot file to the backups directory"""
+    if not file.filename.endswith('.db'):
+        raise HTTPException(status_code=400, detail="File must be a .db file")
+
+    try:
+        # Save uploaded file to backups directory
+        backups_dir = Path("./data/backups")
+        backups_dir.mkdir(parents=True, exist_ok=True)
+
+        timestamp = datetime.utcnow().strftime("%Y%m%d_%H%M%S")
+        uploaded_filename = f"snapshot_uploaded_{timestamp}.db"
+        file_path = backups_dir / uploaded_filename
+
+        # Save file
+        with open(file_path, "wb") as buffer:
+            shutil.copyfileobj(file.file, buffer)
+
+        # Create metadata
+        metadata = {
+            "filename": uploaded_filename,
+            "created_at": timestamp,
+            "created_at_iso": datetime.utcnow().isoformat(),
+            "description": f"Uploaded: {file.filename}",
+            "size_bytes": file_path.stat().st_size,
+            "size_mb": round(file_path.stat().st_size / (1024 * 1024), 2),
+            "type": "uploaded"
+        }
+
+        metadata_path = backups_dir / f"{uploaded_filename}.meta.json"
+        import json
+        with open(metadata_path, 'w') as f:
+            json.dump(metadata, f, indent=2)
+
+        return {
+            "message": "Snapshot uploaded successfully",
+            "snapshot": metadata
+        }
+
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Upload failed: {str(e)}")
+
+
+# ============================================================================
+# SLMM SYNC ENDPOINTS
+# ============================================================================
+
+@router.post("/slmm/sync-all")
+async def sync_all_slms(db: Session = Depends(get_db)):
+    """
+    Manually trigger full sync of all SLM devices from Terra-View roster to SLMM.
+
+    This ensures SLMM database matches Terra-View roster (source of truth).
+    Also cleans up orphaned devices in SLMM that are not in Terra-View.
+    """
+    from backend.services.slmm_sync import sync_all_slms_to_slmm, cleanup_orphaned_slmm_devices
+
+    try:
+        # Sync all SLMs
+        sync_results = await sync_all_slms_to_slmm(db)
+
+        # Clean up orphaned devices
+        cleanup_results = await cleanup_orphaned_slmm_devices(db)
+
+        return {
+            "status": "ok",
+            "sync": sync_results,
+            "cleanup": cleanup_results
+        }
+
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Sync failed: {str(e)}")
+
+
+@router.get("/slmm/status")
+async def get_slmm_sync_status(db: Session = Depends(get_db)):
+    """
+    Get status of SLMM synchronization.
+
+    Shows which devices are in Terra-View roster vs SLMM database.
+    """
+    from backend.services.slmm_sync import get_slmm_devices
+
+    try:
+        # Get devices from both systems
+        roster_slms = db.query(RosterUnit).filter_by(device_type="slm").all()
+        slmm_devices = await get_slmm_devices()
+
+        if slmm_devices is None:
+            raise HTTPException(status_code=503, detail="SLMM service unavailable")
+
+        roster_unit_ids = {unit.unit_type for unit in roster_slms}
+        slmm_unit_ids = set(slmm_devices)
+
+        # Find differences
+        in_roster_only = roster_unit_ids - slmm_unit_ids
+        in_slmm_only = slmm_unit_ids - roster_unit_ids
+        in_both = roster_unit_ids & slmm_unit_ids
+
+        return {
+            "status": "ok",
+            "terra_view_total": len(roster_unit_ids),
+            "slmm_total": len(slmm_unit_ids),
+            "synced": len(in_both),
+            "missing_from_slmm": list(in_roster_only),
+            "orphaned_in_slmm": list(in_slmm_only),
+            "in_sync": len(in_roster_only) == 0 and len(in_slmm_only) == 0
+        }
+
+    except HTTPException:
+        raise
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Status check failed: {str(e)}")

backend/routers/slm_dashboard.py

@@ -0,0 +1,363 @@
+"""
+SLM Dashboard Router
+
+Provides API endpoints for the Sound Level Meters dashboard page.
+"""
+
+from fastapi import APIRouter, Request, Depends, Query
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+from sqlalchemy import func
+from datetime import datetime, timedelta
+import asyncio
+import httpx
+import logging
+import os
+
+from backend.database import get_db
+from backend.models import RosterUnit
+from backend.routers.roster_edit import sync_slm_to_slmm_cache
+from backend.templates_config import templates
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/api/slm-dashboard", tags=["slm-dashboard"])
+
+# SLMM backend URL - configurable via environment variable
+SLMM_BASE_URL = os.getenv("SLMM_BASE_URL", "http://localhost:8100")
+
+
+@router.get("/stats", response_class=HTMLResponse)
+async def get_slm_stats(request: Request, db: Session = Depends(get_db)):
+    """
+    Get summary statistics for SLM dashboard.
+    Returns HTML partial with stat cards.
+    """
+    # Query all SLMs
+    all_slms = db.query(RosterUnit).filter_by(device_type="slm").all()
+
+    # Count deployed vs benched
+    deployed_count = sum(1 for slm in all_slms if slm.deployed and not slm.retired)
+    benched_count = sum(1 for slm in all_slms if not slm.deployed and not slm.retired)
+    retired_count = sum(1 for slm in all_slms if slm.retired)
+
+    # Count recently active (checked in last hour)
+    one_hour_ago = datetime.utcnow() - timedelta(hours=1)
+    active_count = sum(1 for slm in all_slms
+                      if slm.slm_last_check and slm.slm_last_check > one_hour_ago)
+
+    return templates.TemplateResponse("partials/slm_stats.html", {
+        "request": request,
+        "total_count": len(all_slms),
+        "deployed_count": deployed_count,
+        "benched_count": benched_count,
+        "active_count": active_count,
+        "retired_count": retired_count
+    })
+
+
+@router.get("/units", response_class=HTMLResponse)
+async def get_slm_units(
+    request: Request,
+    db: Session = Depends(get_db),
+    search: str = Query(None),
+    project: str = Query(None),
+    include_measurement: bool = Query(False),
+):
+    """
+    Get list of SLM units for the sidebar.
+    Returns HTML partial with unit cards.
+    """
+    query = db.query(RosterUnit).filter_by(device_type="slm")
+
+    # Filter by project if provided
+    if project:
+        query = query.filter(RosterUnit.project_id == project)
+
+    # Filter by search term if provided
+    if search:
+        search_term = f"%{search}%"
+        query = query.filter(
+            (RosterUnit.id.like(search_term)) |
+            (RosterUnit.slm_model.like(search_term)) |
+            (RosterUnit.address.like(search_term))
+        )
+
+    units = query.order_by(
+        RosterUnit.retired.asc(),
+        RosterUnit.deployed.desc(),
+        RosterUnit.id.asc()
+    ).all()
+
+    one_hour_ago = datetime.utcnow() - timedelta(hours=1)
+    for unit in units:
+        unit.is_recent = bool(unit.slm_last_check and unit.slm_last_check > one_hour_ago)
+
+    if include_measurement:
+        async def fetch_measurement_state(client: httpx.AsyncClient, unit_id: str) -> str | None:
+            try:
+                response = await client.get(f"{SLMM_BASE_URL}/api/nl43/{unit_id}/measurement-state")
+                if response.status_code == 200:
+                    return response.json().get("measurement_state")
+            except Exception:
+                return None
+            return None
+
+        deployed_units = [unit for unit in units if unit.deployed and not unit.retired]
+        if deployed_units:
+            async with httpx.AsyncClient(timeout=3.0) as client:
+                tasks = [fetch_measurement_state(client, unit.id) for unit in deployed_units]
+                results = await asyncio.gather(*tasks, return_exceptions=True)
+
+            for unit, state in zip(deployed_units, results):
+                if isinstance(state, Exception):
+                    unit.measurement_state = None
+                else:
+                    unit.measurement_state = state
+
+    return templates.TemplateResponse("partials/slm_device_list.html", {
+        "request": request,
+        "units": units
+    })
+
+
+@router.get("/live-view/{unit_id}", response_class=HTMLResponse)
+async def get_live_view(request: Request, unit_id: str, db: Session = Depends(get_db)):
+    """
+    Get live view panel for a specific SLM unit.
+    Returns HTML partial with live metrics and chart.
+    """
+    # Get unit from database
+    unit = db.query(RosterUnit).filter_by(id=unit_id, device_type="slm").first()
+
+    if not unit:
+        return templates.TemplateResponse("partials/slm_live_view_error.html", {
+            "request": request,
+            "error": f"Unit {unit_id} not found"
+        })
+
+    # Get modem information if assigned
+    modem = None
+    modem_ip = None
+    if unit.deployed_with_modem_id:
+        modem = db.query(RosterUnit).filter_by(id=unit.deployed_with_modem_id, device_type="modem").first()
+        if modem:
+            modem_ip = modem.ip_address
+        else:
+            logger.warning(f"SLM {unit_id} is assigned to modem {unit.deployed_with_modem_id} but modem not found")
+
+    # Fallback to direct slm_host if no modem assigned (backward compatibility)
+    if not modem_ip and unit.slm_host:
+        modem_ip = unit.slm_host
+        logger.info(f"Using legacy slm_host for {unit_id}: {modem_ip}")
+
+    # Try to get current status from SLMM
+    current_status = None
+    measurement_state = None
+    is_measuring = False
+
+    try:
+        async with httpx.AsyncClient(timeout=10.0) as client:
+            # Get measurement state
+            state_response = await client.get(
+                f"{SLMM_BASE_URL}/api/nl43/{unit_id}/measurement-state"
+            )
+            if state_response.status_code == 200:
+                state_data = state_response.json()
+                measurement_state = state_data.get("measurement_state", "Unknown")
+                is_measuring = state_data.get("is_measuring", False)
+
+            # Get live status (measurement_start_time is already stored in SLMM database)
+            status_response = await client.get(
+                f"{SLMM_BASE_URL}/api/nl43/{unit_id}/live"
+            )
+            if status_response.status_code == 200:
+                status_data = status_response.json()
+                current_status = status_data.get("data", {})
+    except Exception as e:
+        logger.error(f"Failed to get status for {unit_id}: {e}")
+
+    return templates.TemplateResponse("partials/slm_live_view.html", {
+        "request": request,
+        "unit": unit,
+        "modem": modem,
+        "modem_ip": modem_ip,
+        "current_status": current_status,
+        "measurement_state": measurement_state,
+        "is_measuring": is_measuring
+    })
+
+
+@router.post("/control/{unit_id}/{action}")
+async def control_slm(unit_id: str, action: str):
+    """
+    Send control commands to SLM (start, stop, pause, resume, reset).
+    Proxies to SLMM backend.
+    """
+    valid_actions = ["start", "stop", "pause", "resume", "reset"]
+
+    if action not in valid_actions:
+        return {"status": "error", "detail": f"Invalid action. Must be one of: {valid_actions}"}
+
+    try:
+        async with httpx.AsyncClient(timeout=10.0) as client:
+            response = await client.post(
+                f"{SLMM_BASE_URL}/api/nl43/{unit_id}/{action}"
+            )
+
+            if response.status_code == 200:
+                return response.json()
+            else:
+                return {
+                    "status": "error",
+                    "detail": f"SLMM returned status {response.status_code}"
+                }
+    except Exception as e:
+        logger.error(f"Failed to control {unit_id}: {e}")
+        return {
+            "status": "error",
+            "detail": str(e)
+        }
+
+@router.get("/config/{unit_id}", response_class=HTMLResponse)
+async def get_slm_config(request: Request, unit_id: str, db: Session = Depends(get_db)):
+    """
+    Get configuration form for a specific SLM unit.
+    Returns HTML partial with configuration form.
+    """
+    unit = db.query(RosterUnit).filter_by(id=unit_id, device_type="slm").first()
+
+    if not unit:
+        return HTMLResponse(
+            content=f'<div class="text-red-500">Unit {unit_id} not found</div>',
+            status_code=404
+        )
+
+    return templates.TemplateResponse("partials/slm_config_form.html", {
+        "request": request,
+        "unit": unit
+    })
+
+
+@router.post("/config/{unit_id}")
+async def save_slm_config(request: Request, unit_id: str, db: Session = Depends(get_db)):
+    """
+    Save SLM configuration.
+    Updates unit parameters in the database.
+    """
+    unit = db.query(RosterUnit).filter_by(id=unit_id, device_type="slm").first()
+
+    if not unit:
+        return {"status": "error", "detail": f"Unit {unit_id} not found"}
+
+    try:
+        # Get form data
+        form_data = await request.form()
+
+        # Update SLM-specific fields
+        unit.slm_model = form_data.get("slm_model") or None
+        unit.slm_serial_number = form_data.get("slm_serial_number") or None
+        unit.slm_frequency_weighting = form_data.get("slm_frequency_weighting") or None
+        unit.slm_time_weighting = form_data.get("slm_time_weighting") or None
+        unit.slm_measurement_range = form_data.get("slm_measurement_range") or None
+
+        # Update network configuration
+        modem_id = form_data.get("deployed_with_modem_id")
+        unit.deployed_with_modem_id = modem_id if modem_id else None
+
+        # Always update TCP and FTP ports (used regardless of modem assignment)
+        unit.slm_tcp_port = int(form_data.get("slm_tcp_port")) if form_data.get("slm_tcp_port") else None
+        unit.slm_ftp_port = int(form_data.get("slm_ftp_port")) if form_data.get("slm_ftp_port") else None
+
+        # Only update direct IP if no modem is assigned
+        if not modem_id:
+            unit.slm_host = form_data.get("slm_host") or None
+        else:
+            # Clear legacy direct IP field when modem is assigned
+            unit.slm_host = None
+
+        db.commit()
+        logger.info(f"Updated configuration for SLM {unit_id}")
+
+        # Sync updated configuration to SLMM cache
+        logger.info(f"Syncing SLM {unit_id} config changes to SLMM cache...")
+        result = await sync_slm_to_slmm_cache(
+            unit_id=unit_id,
+            host=unit.slm_host,  # Use the updated host from Terra-View
+            tcp_port=unit.slm_tcp_port,
+            ftp_port=unit.slm_ftp_port,
+            deployed_with_modem_id=unit.deployed_with_modem_id,  # Resolve modem IP if assigned
+            db=db
+        )
+
+        if not result["success"]:
+            logger.warning(f"SLMM cache sync warning for {unit_id}: {result['message']}")
+            # Config still saved in Terra-View (source of truth)
+
+        return {"status": "success", "unit_id": unit_id}
+
+    except Exception as e:
+        db.rollback()
+        logger.error(f"Failed to save config for {unit_id}: {e}")
+        return {"status": "error", "detail": str(e)}
+
+
+@router.get("/test-modem/{modem_id}")
+async def test_modem_connection(modem_id: str, db: Session = Depends(get_db)):
+    """
+    Test modem connectivity with a simple ping/health check.
+    Returns response time and connection status.
+    """
+    import subprocess
+    import time
+
+    # Get modem from database
+    modem = db.query(RosterUnit).filter_by(id=modem_id, device_type="modem").first()
+
+    if not modem:
+        return {"status": "error", "detail": f"Modem {modem_id} not found"}
+
+    if not modem.ip_address:
+        return {"status": "error", "detail": f"Modem {modem_id} has no IP address configured"}
+
+    try:
+        # Ping the modem (1 packet, 2 second timeout)
+        start_time = time.time()
+        result = subprocess.run(
+            ["ping", "-c", "1", "-W", "2", modem.ip_address],
+            capture_output=True,
+            text=True,
+            timeout=3
+        )
+        response_time = int((time.time() - start_time) * 1000)  # Convert to milliseconds
+
+        if result.returncode == 0:
+            return {
+                "status": "success",
+                "modem_id": modem_id,
+                "ip_address": modem.ip_address,
+                "response_time": response_time,
+                "message": "Modem is responding to ping"
+            }
+        else:
+            return {
+                "status": "error",
+                "modem_id": modem_id,
+                "ip_address": modem.ip_address,
+                "detail": "Modem not responding to ping"
+            }
+
+    except subprocess.TimeoutExpired:
+        return {
+            "status": "error",
+            "modem_id": modem_id,
+            "ip_address": modem.ip_address,
+            "detail": "Ping timeout (> 2 seconds)"
+        }
+    except Exception as e:
+        logger.error(f"Failed to ping modem {modem_id}: {e}")
+        return {
+            "status": "error",
+            "modem_id": modem_id,
+            "detail": str(e)
+        }

backend/routers/slm_ui.py

@@ -0,0 +1,122 @@
+"""
+Sound Level Meter UI Router
+
+Provides endpoints for SLM dashboard cards, detail pages, and real-time data.
+"""
+
+from fastapi import APIRouter, Depends, HTTPException, Request
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+from datetime import datetime
+import httpx
+import logging
+import os
+
+from backend.database import get_db
+from backend.models import RosterUnit
+from backend.templates_config import templates
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/slm", tags=["slm-ui"])
+
+SLMM_BASE_URL = os.getenv("SLMM_BASE_URL", "http://172.19.0.1:8100")
+
+
+@router.get("/{unit_id}", response_class=HTMLResponse)
+async def slm_detail_page(request: Request, unit_id: str, db: Session = Depends(get_db)):
+    """Sound level meter detail page with controls."""
+
+    # Get roster unit
+    unit = db.query(RosterUnit).filter_by(id=unit_id).first()
+    if not unit or unit.device_type != "slm":
+        raise HTTPException(status_code=404, detail="Sound level meter not found")
+
+    return templates.TemplateResponse("slm_detail.html", {
+        "request": request,
+        "unit": unit,
+        "unit_id": unit_id
+    })
+
+
+@router.get("/api/{unit_id}/summary")
+async def get_slm_summary(unit_id: str, db: Session = Depends(get_db)):
+    """Get SLM summary data for dashboard card."""
+
+    # Get roster unit
+    unit = db.query(RosterUnit).filter_by(id=unit_id).first()
+    if not unit or unit.device_type != "slm":
+        raise HTTPException(status_code=404, detail="Sound level meter not found")
+
+    # Try to get live status from SLMM
+    status_data = None
+    try:
+        async with httpx.AsyncClient(timeout=3.0) as client:
+            response = await client.get(f"{SLMM_BASE_URL}/api/nl43/{unit_id}/status")
+            if response.status_code == 200:
+                status_data = response.json().get("data")
+    except Exception as e:
+        logger.warning(f"Failed to get SLM status for {unit_id}: {e}")
+
+    return {
+        "unit_id": unit_id,
+        "device_type": "slm",
+        "deployed": unit.deployed,
+        "model": unit.slm_model or "NL-43",
+        "location": unit.address or unit.location,
+        "coordinates": unit.coordinates,
+        "note": unit.note,
+        "status": status_data,
+        "last_check": unit.slm_last_check.isoformat() if unit.slm_last_check else None,
+    }
+
+
+@router.get("/partials/{unit_id}/card", response_class=HTMLResponse)
+async def slm_dashboard_card(request: Request, unit_id: str, db: Session = Depends(get_db)):
+    """Render SLM dashboard card partial."""
+
+    summary = await get_slm_summary(unit_id, db)
+
+    return templates.TemplateResponse("partials/slm_card.html", {
+        "request": request,
+        "slm": summary
+    })
+
+
+@router.get("/partials/{unit_id}/controls", response_class=HTMLResponse)
+async def slm_controls_partial(request: Request, unit_id: str, db: Session = Depends(get_db)):
+    """Render SLM control panel partial."""
+
+    unit = db.query(RosterUnit).filter_by(id=unit_id).first()
+    if not unit or unit.device_type != "slm":
+        raise HTTPException(status_code=404, detail="Sound level meter not found")
+
+    # Get current status from SLMM
+    measurement_state = None
+    battery_level = None
+    try:
+        async with httpx.AsyncClient(timeout=3.0) as client:
+            # Get measurement state
+            state_response = await client.get(
+                f"{SLMM_BASE_URL}/api/nl43/{unit_id}/measurement-state"
+            )
+            if state_response.status_code == 200:
+                measurement_state = state_response.json().get("measurement_state")
+
+            # Get battery level
+            battery_response = await client.get(
+                f"{SLMM_BASE_URL}/api/nl43/{unit_id}/battery"
+            )
+            if battery_response.status_code == 200:
+                battery_level = battery_response.json().get("battery_level")
+    except Exception as e:
+        logger.warning(f"Failed to get SLM control data for {unit_id}: {e}")
+
+    return templates.TemplateResponse("partials/slm_controls.html", {
+        "request": request,
+        "unit_id": unit_id,
+        "unit": unit,
+        "measurement_state": measurement_state,
+        "battery_level": battery_level,
+        "is_measuring": measurement_state == "Start"
+    })

backend/routers/slmm.py

@@ -0,0 +1,301 @@
+"""
+SLMM (Sound Level Meter Manager) Proxy Router
+
+Proxies requests from SFM to the standalone SLMM backend service.
+SLMM runs on port 8100 and handles NL43/NL53 sound level meter communication.
+"""
+
+from fastapi import APIRouter, HTTPException, Request, Response, WebSocket, WebSocketDisconnect
+from fastapi.responses import StreamingResponse
+import httpx
+import websockets
+import asyncio
+import logging
+import os
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/api/slmm", tags=["slmm"])
+
+# SLMM backend URL - configurable via environment variable
+SLMM_BASE_URL = os.getenv("SLMM_BASE_URL", "http://localhost:8100")
+# WebSocket URL derived from HTTP URL
+SLMM_WS_BASE_URL = SLMM_BASE_URL.replace("http://", "ws://").replace("https://", "wss://")
+
+
+@router.get("/health")
+async def check_slmm_health():
+    """
+    Check if the SLMM backend service is reachable and healthy.
+    """
+    try:
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            response = await client.get(f"{SLMM_BASE_URL}/health")
+
+            if response.status_code == 200:
+                data = response.json()
+                return {
+                    "status": "ok",
+                    "slmm_status": "connected",
+                    "slmm_url": SLMM_BASE_URL,
+                    "slmm_version": data.get("version", "unknown"),
+                    "slmm_response": data
+                }
+            else:
+                return {
+                    "status": "degraded",
+                    "slmm_status": "error",
+                    "slmm_url": SLMM_BASE_URL,
+                    "detail": f"SLMM returned status {response.status_code}"
+                }
+
+    except httpx.ConnectError:
+        return {
+            "status": "error",
+            "slmm_status": "unreachable",
+            "slmm_url": SLMM_BASE_URL,
+            "detail": "Cannot connect to SLMM backend. Is it running?"
+        }
+    except Exception as e:
+        return {
+            "status": "error",
+            "slmm_status": "error",
+            "slmm_url": SLMM_BASE_URL,
+            "detail": str(e)
+        }
+
+
+# WebSocket routes MUST come before the catch-all route
+@router.websocket("/{unit_id}/stream")
+async def proxy_websocket_stream(websocket: WebSocket, unit_id: str):
+    """
+    Proxy WebSocket connections to SLMM's /stream endpoint.
+
+    This allows real-time streaming of measurement data from NL43 devices
+    through the SFM unified interface.
+    """
+    await websocket.accept()
+    logger.info(f"WebSocket connection accepted for SLMM unit {unit_id}")
+
+    # Build target WebSocket URL
+    target_ws_url = f"{SLMM_WS_BASE_URL}/api/nl43/{unit_id}/stream"
+    logger.info(f"Connecting to SLMM WebSocket: {target_ws_url}")
+
+    backend_ws = None
+
+    try:
+        # Connect to SLMM backend WebSocket
+        backend_ws = await websockets.connect(target_ws_url)
+        logger.info(f"Connected to SLMM backend WebSocket for {unit_id}")
+
+        # Create tasks for bidirectional communication
+        async def forward_to_backend():
+            """Forward messages from client to SLMM backend"""
+            try:
+                while True:
+                    data = await websocket.receive_text()
+                    await backend_ws.send(data)
+            except WebSocketDisconnect:
+                logger.info(f"Client WebSocket disconnected for {unit_id}")
+            except Exception as e:
+                logger.error(f"Error forwarding to backend: {e}")
+
+        async def forward_to_client():
+            """Forward messages from SLMM backend to client"""
+            try:
+                async for message in backend_ws:
+                    await websocket.send_text(message)
+            except websockets.exceptions.ConnectionClosed:
+                logger.info(f"Backend WebSocket closed for {unit_id}")
+            except Exception as e:
+                logger.error(f"Error forwarding to client: {e}")
+
+        # Run both forwarding tasks concurrently
+        await asyncio.gather(
+            forward_to_backend(),
+            forward_to_client(),
+            return_exceptions=True
+        )
+
+    except websockets.exceptions.WebSocketException as e:
+        logger.error(f"WebSocket error connecting to SLMM backend: {e}")
+        try:
+            await websocket.send_json({
+                "error": "Failed to connect to SLMM backend",
+                "detail": str(e)
+            })
+        except Exception:
+            pass
+    except Exception as e:
+        logger.error(f"Unexpected error in WebSocket proxy for {unit_id}: {e}")
+        try:
+            await websocket.send_json({
+                "error": "Internal server error",
+                "detail": str(e)
+            })
+        except Exception:
+            pass
+    finally:
+        # Clean up connections
+        if backend_ws:
+            try:
+                await backend_ws.close()
+            except Exception:
+                pass
+        try:
+            await websocket.close()
+        except Exception:
+            pass
+        logger.info(f"WebSocket proxy closed for {unit_id}")
+
+
+@router.websocket("/{unit_id}/live")
+async def proxy_websocket_live(websocket: WebSocket, unit_id: str):
+    """
+    Proxy WebSocket connections to SLMM's /live endpoint.
+
+    Alternative WebSocket endpoint that may be used by some frontend components.
+    """
+    await websocket.accept()
+    logger.info(f"WebSocket connection accepted for SLMM unit {unit_id} (live endpoint)")
+
+    # Build target WebSocket URL - try /stream endpoint as SLMM uses that for WebSocket
+    target_ws_url = f"{SLMM_WS_BASE_URL}/api/nl43/{unit_id}/stream"
+    logger.info(f"Connecting to SLMM WebSocket: {target_ws_url}")
+
+    backend_ws = None
+
+    try:
+        # Connect to SLMM backend WebSocket
+        backend_ws = await websockets.connect(target_ws_url)
+        logger.info(f"Connected to SLMM backend WebSocket for {unit_id} (live endpoint)")
+
+        # Create tasks for bidirectional communication
+        async def forward_to_backend():
+            """Forward messages from client to SLMM backend"""
+            try:
+                while True:
+                    data = await websocket.receive_text()
+                    await backend_ws.send(data)
+            except WebSocketDisconnect:
+                logger.info(f"Client WebSocket disconnected for {unit_id} (live)")
+            except Exception as e:
+                logger.error(f"Error forwarding to backend (live): {e}")
+
+        async def forward_to_client():
+            """Forward messages from SLMM backend to client"""
+            try:
+                async for message in backend_ws:
+                    await websocket.send_text(message)
+            except websockets.exceptions.ConnectionClosed:
+                logger.info(f"Backend WebSocket closed for {unit_id} (live)")
+            except Exception as e:
+                logger.error(f"Error forwarding to client (live): {e}")
+
+        # Run both forwarding tasks concurrently
+        await asyncio.gather(
+            forward_to_backend(),
+            forward_to_client(),
+            return_exceptions=True
+        )
+
+    except websockets.exceptions.WebSocketException as e:
+        logger.error(f"WebSocket error connecting to SLMM backend (live): {e}")
+        try:
+            await websocket.send_json({
+                "error": "Failed to connect to SLMM backend",
+                "detail": str(e)
+            })
+        except Exception:
+            pass
+    except Exception as e:
+        logger.error(f"Unexpected error in WebSocket proxy for {unit_id} (live): {e}")
+        try:
+            await websocket.send_json({
+                "error": "Internal server error",
+                "detail": str(e)
+            })
+        except Exception:
+            pass
+    finally:
+        # Clean up connections
+        if backend_ws:
+            try:
+                await backend_ws.close()
+            except Exception:
+                pass
+        try:
+            await websocket.close()
+        except Exception:
+            pass
+        logger.info(f"WebSocket proxy closed for {unit_id} (live)")
+
+
+# HTTP catch-all route MUST come after specific routes (including WebSocket routes)
+@router.api_route("/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "PATCH"])
+async def proxy_to_slmm(path: str, request: Request):
+    """
+    Proxy all requests to the SLMM backend service.
+
+    This allows SFM to act as a unified frontend for all device types,
+    while SLMM remains a standalone backend service.
+    """
+    # Build target URL
+    target_url = f"{SLMM_BASE_URL}/api/nl43/{path}"
+
+    # Get query parameters
+    query_params = dict(request.query_params)
+
+    # Get request body if present
+    body = None
+    if request.method in ["POST", "PUT", "PATCH"]:
+        try:
+            body = await request.body()
+        except Exception as e:
+            logger.error(f"Failed to read request body: {e}")
+            body = None
+
+    # Get headers (exclude host and other proxy-specific headers)
+    headers = dict(request.headers)
+    headers_to_exclude = ["host", "content-length", "transfer-encoding", "connection"]
+    proxy_headers = {k: v for k, v in headers.items() if k.lower() not in headers_to_exclude}
+
+    logger.info(f"Proxying {request.method} request to SLMM: {target_url}")
+
+    try:
+        async with httpx.AsyncClient(timeout=30.0) as client:
+            # Forward the request to SLMM
+            response = await client.request(
+                method=request.method,
+                url=target_url,
+                params=query_params,
+                headers=proxy_headers,
+                content=body
+            )
+
+            # Return the response from SLMM
+            return Response(
+                content=response.content,
+                status_code=response.status_code,
+                headers=dict(response.headers),
+                media_type=response.headers.get("content-type")
+            )
+
+    except httpx.ConnectError:
+        logger.error(f"Failed to connect to SLMM backend at {SLMM_BASE_URL}")
+        raise HTTPException(
+            status_code=503,
+            detail=f"SLMM backend service unavailable. Is SLMM running on {SLMM_BASE_URL}?"
+        )
+    except httpx.TimeoutException:
+        logger.error(f"Timeout connecting to SLMM backend at {SLMM_BASE_URL}")
+        raise HTTPException(
+            status_code=504,
+            detail="SLMM backend timeout"
+        )
+    except Exception as e:
+        logger.error(f"Error proxying to SLMM: {e}")
+        raise HTTPException(
+            status_code=500,
+            detail=f"Failed to proxy request to SLMM: {str(e)}"
+        )

backend/routers/units.py

@@ -0,0 +1,74 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from datetime import datetime
+from typing import Dict, Any
+
+from backend.database import get_db
+from backend.services.snapshot import emit_status_snapshot
+from backend.models import RosterUnit
+
+router = APIRouter(prefix="/api", tags=["units"])
+
+
+@router.get("/unit/{unit_id}")
+def get_unit_detail(unit_id: str, db: Session = Depends(get_db)):
+    """
+    Returns detailed data for a single unit.
+    """
+    snapshot = emit_status_snapshot()
+
+    if unit_id not in snapshot["units"]:
+        raise HTTPException(status_code=404, detail=f"Unit {unit_id} not found")
+
+    unit_data = snapshot["units"][unit_id]
+
+    # Mock coordinates for now (will be replaced with real data)
+    mock_coords = {
+        "BE1234": {"lat": 37.7749, "lon": -122.4194, "location": "San Francisco, CA"},
+        "BE5678": {"lat": 34.0522, "lon": -118.2437, "location": "Los Angeles, CA"},
+        "BE9012": {"lat": 40.7128, "lon": -74.0060, "location": "New York, NY"},
+        "BE3456": {"lat": 41.8781, "lon": -87.6298, "location": "Chicago, IL"},
+        "BE7890": {"lat": 29.7604, "lon": -95.3698, "location": "Houston, TX"},
+    }
+
+    coords = mock_coords.get(unit_id, {"lat": 39.8283, "lon": -98.5795, "location": "Unknown"})
+
+    return {
+        "id": unit_id,
+        "status": unit_data["status"],
+        "age": unit_data["age"],
+        "last_seen": unit_data["last"],
+        "last_file": unit_data.get("fname", ""),
+        "deployed": unit_data["deployed"],
+        "note": unit_data.get("note", ""),
+        "coordinates": coords
+    }
+
+
+@router.get("/units/{unit_id}")
+def get_unit_by_id(unit_id: str, db: Session = Depends(get_db)):
+    """
+    Get unit data directly from the roster (for settings/configuration).
+    """
+    unit = db.query(RosterUnit).filter_by(id=unit_id).first()
+
+    if not unit:
+        raise HTTPException(status_code=404, detail=f"Unit {unit_id} not found")
+
+    return {
+        "id": unit.id,
+        "unit_type": unit.unit_type,
+        "device_type": unit.device_type,
+        "deployed": unit.deployed,
+        "retired": unit.retired,
+        "note": unit.note,
+        "location": unit.location,
+        "address": unit.address,
+        "coordinates": unit.coordinates,
+        "slm_host": unit.slm_host,
+        "slm_tcp_port": unit.slm_tcp_port,
+        "slm_ftp_port": unit.slm_ftp_port,
+        "slm_model": unit.slm_model,
+        "slm_serial_number": unit.slm_serial_number,
+        "deployed_with_modem_id": unit.deployed_with_modem_id
+    }

backend/routers/watcher_manager.py

@@ -0,0 +1,133 @@
+"""
+Watcher Manager — admin API for series3-watcher and thor-watcher agents.
+
+Endpoints:
+  GET  /api/admin/watchers                      — list all watcher agents
+  GET  /api/admin/watchers/{agent_id}           — get single agent detail
+  POST /api/admin/watchers/{agent_id}/trigger-update  — flag agent for update
+  POST /api/admin/watchers/{agent_id}/clear-update    — clear update flag
+  GET  /api/admin/watchers/{agent_id}/update-check    — polled by watcher on heartbeat
+
+Page:
+  GET  /admin/watchers                          — HTML admin page
+"""
+
+from datetime import datetime, timezone
+from fastapi import APIRouter, Depends, HTTPException, Request
+from fastapi.responses import HTMLResponse
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+from typing import Optional
+
+from backend.database import get_db
+from backend.models import WatcherAgent
+from backend.templates_config import templates
+
+router = APIRouter(tags=["admin"])
+
+
+# ── helpers ──────────────────────────────────────────────────────────────────
+
+def _agent_to_dict(agent: WatcherAgent) -> dict:
+    last_seen = agent.last_seen
+    if last_seen:
+        now_utc = datetime.utcnow()
+        age_minutes = int((now_utc - last_seen).total_seconds() // 60)
+        if age_minutes > 60:
+            status = "missing"
+        else:
+            status = "ok"
+    else:
+        age_minutes = None
+        status = "missing"
+
+    return {
+        "id": agent.id,
+        "source_type": agent.source_type,
+        "version": agent.version,
+        "last_seen": last_seen.isoformat() if last_seen else None,
+        "age_minutes": age_minutes,
+        "status": status,
+        "ip_address": agent.ip_address,
+        "log_tail": agent.log_tail,
+        "update_pending": bool(agent.update_pending),
+        "update_version": agent.update_version,
+    }
+
+
+# ── API routes ────────────────────────────────────────────────────────────────
+
+@router.get("/api/admin/watchers")
+def list_watchers(db: Session = Depends(get_db)):
+    agents = db.query(WatcherAgent).order_by(WatcherAgent.last_seen.desc()).all()
+    return [_agent_to_dict(a) for a in agents]
+
+
+@router.get("/api/admin/watchers/{agent_id}")
+def get_watcher(agent_id: str, db: Session = Depends(get_db)):
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        raise HTTPException(status_code=404, detail="Watcher agent not found")
+    return _agent_to_dict(agent)
+
+
+class TriggerUpdateRequest(BaseModel):
+    version: Optional[str] = None  # target version label (informational)
+
+
+@router.post("/api/admin/watchers/{agent_id}/trigger-update")
+def trigger_update(agent_id: str, body: TriggerUpdateRequest, db: Session = Depends(get_db)):
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        raise HTTPException(status_code=404, detail="Watcher agent not found")
+    agent.update_pending = True
+    agent.update_version = body.version
+    db.commit()
+    return {"ok": True, "agent_id": agent_id, "update_pending": True}
+
+
+@router.post("/api/admin/watchers/{agent_id}/clear-update")
+def clear_update(agent_id: str, db: Session = Depends(get_db)):
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        raise HTTPException(status_code=404, detail="Watcher agent not found")
+    agent.update_pending = False
+    agent.update_version = None
+    db.commit()
+    return {"ok": True, "agent_id": agent_id, "update_pending": False}
+
+
+@router.get("/api/admin/watchers/{agent_id}/update-check")
+def update_check(agent_id: str, db: Session = Depends(get_db)):
+    """
+    Polled by watcher agents on each heartbeat cycle.
+    Returns update_available=True when an update has been triggered via the UI.
+    Automatically clears the flag after the watcher acknowledges it.
+    """
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        return {"update_available": False}
+
+    pending = bool(agent.update_pending)
+
+    if pending:
+        # Clear the flag — the watcher will now self-update
+        agent.update_pending = False
+        db.commit()
+
+    return {
+        "update_available": pending,
+        "version": agent.update_version,
+    }
+
+
+# ── HTML page ─────────────────────────────────────────────────────────────────
+
+@router.get("/admin/watchers", response_class=HTMLResponse)
+def admin_watchers_page(request: Request, db: Session = Depends(get_db)):
+    agents = db.query(WatcherAgent).order_by(WatcherAgent.last_seen.desc()).all()
+    agents_data = [_agent_to_dict(a) for a in agents]
+    return templates.TemplateResponse("admin_watchers.html", {
+        "request": request,
+        "agents": agents_data,
+    })

backend/routes.py

@@ -0,0 +1,354 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional, List
+
+from backend.database import get_db
+from backend.models import Emitter, WatcherAgent
+
+router = APIRouter()
+
+
+# Helper function to detect unit type from unit ID
+def detect_unit_type(unit_id: str) -> str:
+    """
+    Automatically detect if a unit is Series 3 or Series 4 based on ID pattern.
+
+    Series 4 (Micromate) units have IDs starting with "UM" followed by digits (e.g., UM11719)
+    Series 3 units typically have other patterns
+
+    Returns:
+        "series4" if the unit ID matches Micromate pattern (UM#####)
+        "series3" otherwise
+    """
+    if not unit_id:
+        return "unknown"
+
+    # Series 4 (Micromate) pattern: UM followed by digits
+    if unit_id.upper().startswith("UM") and len(unit_id) > 2:
+        # Check if remaining characters after "UM" are digits
+        rest = unit_id[2:]
+        if rest.isdigit():
+            return "series4"
+
+    # Default to series3 for other patterns
+    return "series3"
+
+
+# Pydantic schemas for request/response validation
+class EmitterReport(BaseModel):
+    unit: str
+    unit_type: str
+    timestamp: str
+    file: str
+    status: str
+
+
+class EmitterResponse(BaseModel):
+    id: str
+    unit_type: str
+    last_seen: datetime
+    last_file: str
+    status: str
+    notes: Optional[str] = None
+
+    class Config:
+        from_attributes = True
+
+
+@router.post("/emitters/report", status_code=200)
+def report_emitter(report: EmitterReport, db: Session = Depends(get_db)):
+    """
+    Endpoint for emitters to report their status.
+    Creates a new emitter if it doesn't exist, or updates an existing one.
+    """
+    try:
+        # Parse the timestamp
+        timestamp = datetime.fromisoformat(report.timestamp.replace('Z', '+00:00'))
+    except ValueError:
+        raise HTTPException(status_code=400, detail="Invalid timestamp format")
+
+    # Check if emitter already exists
+    emitter = db.query(Emitter).filter(Emitter.id == report.unit).first()
+
+    if emitter:
+        # Update existing emitter
+        emitter.unit_type = report.unit_type
+        emitter.last_seen = timestamp
+        emitter.last_file = report.file
+        emitter.status = report.status
+    else:
+        # Create new emitter
+        emitter = Emitter(
+            id=report.unit,
+            unit_type=report.unit_type,
+            last_seen=timestamp,
+            last_file=report.file,
+            status=report.status
+        )
+        db.add(emitter)
+
+    db.commit()
+    db.refresh(emitter)
+
+    return {
+        "message": "Emitter report received",
+        "unit": emitter.id,
+        "status": emitter.status
+    }
+
+
+@router.get("/fleet/status", response_model=List[EmitterResponse])
+def get_fleet_status(db: Session = Depends(get_db)):
+    """
+    Returns a list of all emitters and their current status.
+    """
+    emitters = db.query(Emitter).all()
+    return emitters
+
+# ── Watcher agent upsert helper ───────────────────────────────────────────────
+
+def _upsert_watcher_agent(db: Session, source_id: str, source_type: str,
+                           version: str, ip_address: str, log_tail: str,
+                           status: str) -> None:
+    """Create or update the WatcherAgent row for a given source_id."""
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == source_id).first()
+    if agent:
+        agent.source_type = source_type
+        agent.version = version
+        agent.last_seen = datetime.utcnow()
+        agent.status = status
+        if ip_address:
+            agent.ip_address = ip_address
+        if log_tail is not None:
+            agent.log_tail = log_tail
+    else:
+        agent = WatcherAgent(
+            id=source_id,
+            source_type=source_type,
+            version=version,
+            last_seen=datetime.utcnow(),
+            status=status,
+            ip_address=ip_address,
+            log_tail=log_tail,
+        )
+        db.add(agent)
+
+
+# series3v1.1 Standardized Heartbeat Schema (multi-unit)
+from fastapi import Request
+
+@router.post("/api/series3/heartbeat", status_code=200)
+async def series3_heartbeat(request: Request, db: Session = Depends(get_db)):
+    """
+    Accepts a full telemetry payload from the Series3 emitter.
+    Updates or inserts each unit into the database.
+    """
+    payload = await request.json()
+
+    source = payload.get("source_id")
+    units = payload.get("units", [])
+    version = payload.get("version")
+    log_tail = payload.get("log_tail")  # list of strings or None
+    import json as _json
+    log_tail_str = _json.dumps(log_tail) if log_tail is not None else None
+    client_ip = request.client.host if request.client else None
+
+    print("\n=== Series 3 Heartbeat ===")
+    print("Source:", source)
+    print("Units received:", len(units))
+    print("==========================\n")
+
+    results = []
+
+    for u in units:
+        uid = u.get("unit_id")
+        last_event_time = u.get("last_event_time")
+        event_meta = u.get("event_metadata", {})
+        age_minutes = u.get("age_minutes")
+
+        try:
+            if last_event_time:
+                ts = datetime.fromisoformat(last_event_time.replace("Z", "+00:00"))
+            else:
+                ts = None
+        except:
+            ts = None
+
+        # Pull from DB
+        emitter = db.query(Emitter).filter(Emitter.id == uid).first()
+
+        # File name (from event_metadata)
+        last_file = event_meta.get("file_name")
+        status = "Unknown"
+
+        # Determine status based on age
+        if age_minutes is None:
+            status = "Missing"
+        elif age_minutes > 24 * 60:
+            status = "Missing"
+        elif age_minutes > 12 * 60:
+            status = "Pending"
+        else:
+            status = "OK"
+
+        if emitter:
+            # Update existing
+            emitter.last_seen = ts
+            emitter.last_file = last_file
+            emitter.status = status
+            # Update unit_type if it was incorrectly classified
+            detected_type = detect_unit_type(uid)
+            if emitter.unit_type != detected_type:
+                emitter.unit_type = detected_type
+        else:
+            # Insert new - auto-detect unit type from ID
+            detected_type = detect_unit_type(uid)
+            emitter = Emitter(
+                id=uid,
+                unit_type=detected_type,
+                last_seen=ts,
+                last_file=last_file,
+                status=status
+            )
+            db.add(emitter)
+
+        results.append({"unit": uid, "status": status})
+
+    if source:
+        _upsert_watcher_agent(db, source, "series3_watcher", version,
+                               client_ip, log_tail_str, "ok")
+
+    db.commit()
+
+    # Check if an update has been triggered for this agent
+    update_available = False
+    if source:
+        agent = db.query(WatcherAgent).filter(WatcherAgent.id == source).first()
+        if agent and agent.update_pending:
+            update_available = True
+            agent.update_pending = False
+            db.commit()
+
+    return {
+        "message": "Heartbeat processed",
+        "source": source,
+        "units_processed": len(results),
+        "results": results,
+        "update_available": update_available,
+    }
+
+
+# series4 (Micromate) Standardized Heartbeat Schema
+@router.post("/api/series4/heartbeat", status_code=200)
+async def series4_heartbeat(request: Request, db: Session = Depends(get_db)):
+    """
+    Accepts a full telemetry payload from the Series4 (Micromate) emitter.
+    Updates or inserts each unit into the database.
+
+    Expected payload:
+    {
+      "source": "series4_emitter",
+      "generated_at": "2025-12-04T20:01:00",
+      "units": [
+        {
+          "unit_id": "UM11719",
+          "type": "micromate",
+          "project_hint": "Clearwater - ECMS 57940",
+          "last_call": "2025-12-04T19:30:42",
+          "status": "OK",
+          "age_days": 0.04,
+          "age_hours": 0.9,
+          "mlg_path": "C:\\THORDATA\\..."
+        }
+      ]
+    }
+    """
+    payload = await request.json()
+
+    # Accept source_id (new standard field) with fallback to legacy "source" key
+    source = payload.get("source_id") or payload.get("source", "series4_emitter")
+    units = payload.get("units", [])
+    version = payload.get("version")
+    log_tail = payload.get("log_tail")
+    import json as _json
+    log_tail_str = _json.dumps(log_tail) if log_tail is not None else None
+    client_ip = request.client.host if request.client else None
+
+    print("\n=== Series 4 Heartbeat ===")
+    print("Source:", source)
+    print("Units received:", len(units))
+    print("==========================\n")
+
+    results = []
+
+    for u in units:
+        uid = u.get("unit_id")
+        last_call_str = u.get("last_call")
+        status = u.get("status", "Unknown")
+        mlg_path = u.get("mlg_path")
+        project_hint = u.get("project_hint")
+
+        # Parse last_call timestamp
+        try:
+            if last_call_str:
+                ts = datetime.fromisoformat(last_call_str.replace("Z", "+00:00"))
+            else:
+                ts = None
+        except:
+            ts = None
+
+        # Pull from DB
+        emitter = db.query(Emitter).filter(Emitter.id == uid).first()
+
+        if emitter:
+            # Update existing
+            emitter.last_seen = ts
+            emitter.last_file = mlg_path
+            emitter.status = status
+            # Update unit_type if it was incorrectly classified
+            detected_type = detect_unit_type(uid)
+            if emitter.unit_type != detected_type:
+                emitter.unit_type = detected_type
+            # Optionally update notes with project hint if it exists
+            if project_hint and not emitter.notes:
+                emitter.notes = f"Project: {project_hint}"
+        else:
+            # Insert new - auto-detect unit type from ID
+            detected_type = detect_unit_type(uid)
+            notes = f"Project: {project_hint}" if project_hint else None
+            emitter = Emitter(
+                id=uid,
+                unit_type=detected_type,
+                last_seen=ts,
+                last_file=mlg_path,
+                status=status,
+                notes=notes
+            )
+            db.add(emitter)
+
+        results.append({"unit": uid, "status": status})
+
+    if source:
+        _upsert_watcher_agent(db, source, "series4_watcher", version,
+                               client_ip, log_tail_str, "ok")
+
+    db.commit()
+
+    # Check if an update has been triggered for this agent
+    update_available = False
+    if source:
+        agent = db.query(WatcherAgent).filter(WatcherAgent.id == source).first()
+        if agent and agent.update_pending:
+            update_available = True
+            agent.update_pending = False
+            db.commit()
+
+    return {
+        "message": "Heartbeat processed",
+        "source": source,
+        "units_processed": len(results),
+        "results": results,
+        "update_available": update_available,
+    }

backend/services/alert_service.py

@@ -0,0 +1,462 @@
+"""
+Alert Service
+
+Manages in-app alerts for device status changes and system events.
+Provides foundation for future notification channels (email, webhook).
+"""
+
+import json
+import uuid
+import logging
+from datetime import datetime, timedelta
+from typing import Optional, List, Dict, Any
+
+from sqlalchemy.orm import Session
+from sqlalchemy import and_, or_
+
+from backend.models import Alert, RosterUnit
+
+logger = logging.getLogger(__name__)
+
+
+class AlertService:
+    """
+    Service for managing alerts.
+
+    Handles alert lifecycle:
+    - Create alerts from various triggers
+    - Query active alerts
+    - Acknowledge/resolve/dismiss alerts
+    - (Future) Dispatch to notification channels
+    """
+
+    def __init__(self, db: Session):
+        self.db = db
+
+    def create_alert(
+        self,
+        alert_type: str,
+        title: str,
+        message: str = None,
+        severity: str = "warning",
+        unit_id: str = None,
+        project_id: str = None,
+        location_id: str = None,
+        schedule_id: str = None,
+        metadata: dict = None,
+        expires_hours: int = 24,
+    ) -> Alert:
+        """
+        Create a new alert.
+
+        Args:
+            alert_type: Type of alert (device_offline, device_online, schedule_failed)
+            title: Short alert title
+            message: Detailed description
+            severity: info, warning, or critical
+            unit_id: Related unit ID (optional)
+            project_id: Related project ID (optional)
+            location_id: Related location ID (optional)
+            schedule_id: Related schedule ID (optional)
+            metadata: Additional JSON data
+            expires_hours: Hours until auto-expiry (default 24)
+
+        Returns:
+            Created Alert instance
+        """
+        alert = Alert(
+            id=str(uuid.uuid4()),
+            alert_type=alert_type,
+            title=title,
+            message=message,
+            severity=severity,
+            unit_id=unit_id,
+            project_id=project_id,
+            location_id=location_id,
+            schedule_id=schedule_id,
+            alert_metadata=json.dumps(metadata) if metadata else None,
+            status="active",
+            expires_at=datetime.utcnow() + timedelta(hours=expires_hours),
+        )
+
+        self.db.add(alert)
+        self.db.commit()
+        self.db.refresh(alert)
+
+        logger.info(f"Created alert: {alert.title} ({alert.alert_type})")
+        return alert
+
+    def create_device_offline_alert(
+        self,
+        unit_id: str,
+        consecutive_failures: int = 0,
+        last_error: str = None,
+    ) -> Optional[Alert]:
+        """
+        Create alert when device becomes unreachable.
+
+        Only creates if no active offline alert exists for this device.
+
+        Args:
+            unit_id: The unit that went offline
+            consecutive_failures: Number of consecutive poll failures
+            last_error: Last error message from polling
+
+        Returns:
+            Created Alert or None if alert already exists
+        """
+        # Check if active offline alert already exists
+        existing = self.db.query(Alert).filter(
+            and_(
+                Alert.unit_id == unit_id,
+                Alert.alert_type == "device_offline",
+                Alert.status == "active",
+            )
+        ).first()
+
+        if existing:
+            logger.debug(f"Offline alert already exists for {unit_id}")
+            return None
+
+        # Get unit info for title
+        unit = self.db.query(RosterUnit).filter_by(id=unit_id).first()
+        unit_name = unit.id if unit else unit_id
+
+        # Determine severity based on failure count
+        severity = "critical" if consecutive_failures >= 5 else "warning"
+
+        return self.create_alert(
+            alert_type="device_offline",
+            title=f"{unit_name} is offline",
+            message=f"Device has been unreachable after {consecutive_failures} failed connection attempts."
+                    + (f" Last error: {last_error}" if last_error else ""),
+            severity=severity,
+            unit_id=unit_id,
+            metadata={
+                "consecutive_failures": consecutive_failures,
+                "last_error": last_error,
+            },
+            expires_hours=48,  # Offline alerts stay longer
+        )
+
+    def resolve_device_offline_alert(self, unit_id: str) -> Optional[Alert]:
+        """
+        Auto-resolve offline alert when device comes back online.
+
+        Also creates an "device_online" info alert to notify user.
+
+        Args:
+            unit_id: The unit that came back online
+
+        Returns:
+            The resolved Alert or None if no alert existed
+        """
+        # Find active offline alert
+        alert = self.db.query(Alert).filter(
+            and_(
+                Alert.unit_id == unit_id,
+                Alert.alert_type == "device_offline",
+                Alert.status == "active",
+            )
+        ).first()
+
+        if not alert:
+            return None
+
+        # Resolve the offline alert
+        alert.status = "resolved"
+        alert.resolved_at = datetime.utcnow()
+        self.db.commit()
+
+        logger.info(f"Resolved offline alert for {unit_id}")
+
+        # Create online notification
+        unit = self.db.query(RosterUnit).filter_by(id=unit_id).first()
+        unit_name = unit.id if unit else unit_id
+
+        self.create_alert(
+            alert_type="device_online",
+            title=f"{unit_name} is back online",
+            message="Device connection has been restored.",
+            severity="info",
+            unit_id=unit_id,
+            expires_hours=6,  # Info alerts expire quickly
+        )
+
+        return alert
+
+    def create_schedule_failed_alert(
+        self,
+        schedule_id: str,
+        action_type: str,
+        unit_id: str = None,
+        error_message: str = None,
+        project_id: str = None,
+        location_id: str = None,
+    ) -> Alert:
+        """
+        Create alert when a scheduled action fails.
+
+        Args:
+            schedule_id: The ScheduledAction or RecurringSchedule ID
+            action_type: start, stop, download, cycle
+            unit_id: Related unit
+            error_message: Error from execution
+            project_id: Related project
+            location_id: Related location
+
+        Returns:
+            Created Alert
+        """
+        return self.create_alert(
+            alert_type="schedule_failed",
+            title=f"Scheduled {action_type} failed",
+            message=error_message or f"The scheduled {action_type} action did not complete successfully.",
+            severity="warning",
+            unit_id=unit_id,
+            project_id=project_id,
+            location_id=location_id,
+            schedule_id=schedule_id,
+            metadata={"action_type": action_type},
+            expires_hours=24,
+        )
+
+    def create_schedule_completed_alert(
+        self,
+        schedule_id: str,
+        action_type: str,
+        unit_id: str = None,
+        project_id: str = None,
+        location_id: str = None,
+        metadata: dict = None,
+    ) -> Alert:
+        """
+        Create alert when a scheduled action completes successfully.
+
+        Args:
+            schedule_id: The ScheduledAction ID
+            action_type: start, stop, download, cycle
+            unit_id: Related unit
+            project_id: Related project
+            location_id: Related location
+            metadata: Additional info (e.g., downloaded folder, index numbers)
+
+        Returns:
+            Created Alert
+        """
+        # Build descriptive message based on action type and metadata
+        if action_type == "stop" and metadata:
+            download_folder = metadata.get("downloaded_folder")
+            download_success = metadata.get("download_success", False)
+            if download_success and download_folder:
+                message = f"Measurement stopped and data downloaded ({download_folder})"
+            elif download_success is False and metadata.get("download_attempted"):
+                message = "Measurement stopped but download failed"
+            else:
+                message = "Measurement stopped successfully"
+        elif action_type == "start" and metadata:
+            new_index = metadata.get("new_index")
+            if new_index is not None:
+                message = f"Measurement started (index {new_index:04d})"
+            else:
+                message = "Measurement started successfully"
+        else:
+            message = f"Scheduled {action_type} completed successfully"
+
+        return self.create_alert(
+            alert_type="schedule_completed",
+            title=f"Scheduled {action_type} completed",
+            message=message,
+            severity="info",
+            unit_id=unit_id,
+            project_id=project_id,
+            location_id=location_id,
+            schedule_id=schedule_id,
+            metadata={"action_type": action_type, **(metadata or {})},
+            expires_hours=12,  # Info alerts expire quickly
+        )
+
+    def get_active_alerts(
+        self,
+        project_id: str = None,
+        unit_id: str = None,
+        alert_type: str = None,
+        min_severity: str = None,
+        limit: int = 50,
+    ) -> List[Alert]:
+        """
+        Query active alerts with optional filters.
+
+        Args:
+            project_id: Filter by project
+            unit_id: Filter by unit
+            alert_type: Filter by alert type
+            min_severity: Minimum severity (info, warning, critical)
+            limit: Maximum results
+
+        Returns:
+            List of matching alerts
+        """
+        query = self.db.query(Alert).filter(Alert.status == "active")
+
+        if project_id:
+            query = query.filter(Alert.project_id == project_id)
+
+        if unit_id:
+            query = query.filter(Alert.unit_id == unit_id)
+
+        if alert_type:
+            query = query.filter(Alert.alert_type == alert_type)
+
+        if min_severity:
+            # Map severity to numeric for comparison
+            severity_levels = {"info": 1, "warning": 2, "critical": 3}
+            min_level = severity_levels.get(min_severity, 1)
+
+            if min_level == 2:
+                query = query.filter(Alert.severity.in_(["warning", "critical"]))
+            elif min_level == 3:
+                query = query.filter(Alert.severity == "critical")
+
+        return query.order_by(Alert.created_at.desc()).limit(limit).all()
+
+    def get_all_alerts(
+        self,
+        status: str = None,
+        project_id: str = None,
+        unit_id: str = None,
+        alert_type: str = None,
+        limit: int = 50,
+        offset: int = 0,
+    ) -> List[Alert]:
+        """
+        Query all alerts with optional filters (includes non-active).
+
+        Args:
+            status: Filter by status (active, acknowledged, resolved, dismissed)
+            project_id: Filter by project
+            unit_id: Filter by unit
+            alert_type: Filter by alert type
+            limit: Maximum results
+            offset: Pagination offset
+
+        Returns:
+            List of matching alerts
+        """
+        query = self.db.query(Alert)
+
+        if status:
+            query = query.filter(Alert.status == status)
+
+        if project_id:
+            query = query.filter(Alert.project_id == project_id)
+
+        if unit_id:
+            query = query.filter(Alert.unit_id == unit_id)
+
+        if alert_type:
+            query = query.filter(Alert.alert_type == alert_type)
+
+        return (
+            query.order_by(Alert.created_at.desc())
+            .offset(offset)
+            .limit(limit)
+            .all()
+        )
+
+    def get_active_alert_count(self) -> int:
+        """Get count of active alerts for badge display."""
+        return self.db.query(Alert).filter(Alert.status == "active").count()
+
+    def acknowledge_alert(self, alert_id: str) -> Optional[Alert]:
+        """
+        Mark alert as acknowledged.
+
+        Args:
+            alert_id: Alert to acknowledge
+
+        Returns:
+            Updated Alert or None if not found
+        """
+        alert = self.db.query(Alert).filter_by(id=alert_id).first()
+        if not alert:
+            return None
+
+        alert.status = "acknowledged"
+        alert.acknowledged_at = datetime.utcnow()
+        self.db.commit()
+
+        logger.info(f"Acknowledged alert: {alert.title}")
+        return alert
+
+    def dismiss_alert(self, alert_id: str) -> Optional[Alert]:
+        """
+        Dismiss alert (user chose to ignore).
+
+        Args:
+            alert_id: Alert to dismiss
+
+        Returns:
+            Updated Alert or None if not found
+        """
+        alert = self.db.query(Alert).filter_by(id=alert_id).first()
+        if not alert:
+            return None
+
+        alert.status = "dismissed"
+        self.db.commit()
+
+        logger.info(f"Dismissed alert: {alert.title}")
+        return alert
+
+    def resolve_alert(self, alert_id: str) -> Optional[Alert]:
+        """
+        Manually resolve an alert.
+
+        Args:
+            alert_id: Alert to resolve
+
+        Returns:
+            Updated Alert or None if not found
+        """
+        alert = self.db.query(Alert).filter_by(id=alert_id).first()
+        if not alert:
+            return None
+
+        alert.status = "resolved"
+        alert.resolved_at = datetime.utcnow()
+        self.db.commit()
+
+        logger.info(f"Resolved alert: {alert.title}")
+        return alert
+
+    def cleanup_expired_alerts(self) -> int:
+        """
+        Remove alerts past their expiration time.
+
+        Returns:
+            Number of alerts cleaned up
+        """
+        now = datetime.utcnow()
+        expired = self.db.query(Alert).filter(
+            and_(
+                Alert.expires_at.isnot(None),
+                Alert.expires_at < now,
+                Alert.status == "active",
+            )
+        ).all()
+
+        count = len(expired)
+        for alert in expired:
+            alert.status = "dismissed"
+
+        if count > 0:
+            self.db.commit()
+            logger.info(f"Cleaned up {count} expired alerts")
+
+        return count
+
+
+def get_alert_service(db: Session) -> AlertService:
+    """Get an AlertService instance with the given database session."""
+    return AlertService(db)

backend/services/backup_scheduler.py

@@ -0,0 +1,145 @@
+"""
+Automatic Database Backup Scheduler
+Handles scheduled automatic backups of the database
+"""
+
+import schedule
+import time
+import threading
+from datetime import datetime
+from typing import Optional
+import logging
+
+from backend.services.database_backup import DatabaseBackupService
+
+logger = logging.getLogger(__name__)
+
+
+class BackupScheduler:
+    """Manages automatic database backups on a schedule"""
+
+    def __init__(self, db_path: str = "./data/seismo_fleet.db", backups_dir: str = "./data/backups"):
+        self.backup_service = DatabaseBackupService(db_path=db_path, backups_dir=backups_dir)
+        self.scheduler_thread: Optional[threading.Thread] = None
+        self.is_running = False
+
+        # Default settings
+        self.backup_interval_hours = 24  # Daily backups
+        self.keep_count = 10  # Keep last 10 backups
+        self.enabled = False
+
+    def configure(self, interval_hours: int = 24, keep_count: int = 10, enabled: bool = True):
+        """
+        Configure backup scheduler settings
+
+        Args:
+            interval_hours: Hours between automatic backups
+            keep_count: Number of backups to retain
+            enabled: Whether automatic backups are enabled
+        """
+        self.backup_interval_hours = interval_hours
+        self.keep_count = keep_count
+        self.enabled = enabled
+
+        logger.info(f"Backup scheduler configured: interval={interval_hours}h, keep={keep_count}, enabled={enabled}")
+
+    def create_automatic_backup(self):
+        """Create an automatic backup and cleanup old ones"""
+        if not self.enabled:
+            logger.info("Automatic backups are disabled, skipping")
+            return
+
+        try:
+            timestamp = datetime.utcnow().strftime("%Y-%m-%d %H:%M UTC")
+            description = f"Automatic backup - {timestamp}"
+
+            logger.info("Creating automatic backup...")
+            snapshot = self.backup_service.create_snapshot(description=description)
+
+            logger.info(f"Automatic backup created: {snapshot['filename']} ({snapshot['size_mb']} MB)")
+
+            # Cleanup old backups
+            cleanup_result = self.backup_service.cleanup_old_snapshots(keep_count=self.keep_count)
+            if cleanup_result['deleted'] > 0:
+                logger.info(f"Cleaned up {cleanup_result['deleted']} old snapshots")
+
+            return snapshot
+
+        except Exception as e:
+            logger.error(f"Automatic backup failed: {str(e)}")
+            return None
+
+    def start(self):
+        """Start the backup scheduler in a background thread"""
+        if self.is_running:
+            logger.warning("Backup scheduler is already running")
+            return
+
+        if not self.enabled:
+            logger.info("Backup scheduler is disabled, not starting")
+            return
+
+        logger.info(f"Starting backup scheduler (every {self.backup_interval_hours} hours)")
+
+        # Clear any existing scheduled jobs
+        schedule.clear()
+
+        # Schedule the backup job
+        schedule.every(self.backup_interval_hours).hours.do(self.create_automatic_backup)
+
+        # Also run immediately on startup
+        self.create_automatic_backup()
+
+        # Start the scheduler thread
+        self.is_running = True
+        self.scheduler_thread = threading.Thread(target=self._run_scheduler, daemon=True)
+        self.scheduler_thread.start()
+
+        logger.info("Backup scheduler started successfully")
+
+    def _run_scheduler(self):
+        """Internal method to run the scheduler loop"""
+        while self.is_running:
+            schedule.run_pending()
+            time.sleep(60)  # Check every minute
+
+    def stop(self):
+        """Stop the backup scheduler"""
+        if not self.is_running:
+            logger.warning("Backup scheduler is not running")
+            return
+
+        logger.info("Stopping backup scheduler...")
+        self.is_running = False
+        schedule.clear()
+
+        if self.scheduler_thread:
+            self.scheduler_thread.join(timeout=5)
+
+        logger.info("Backup scheduler stopped")
+
+    def get_status(self) -> dict:
+        """Get current scheduler status"""
+        next_run = None
+        if self.is_running and schedule.jobs:
+            next_run = schedule.jobs[0].next_run.isoformat() if schedule.jobs[0].next_run else None
+
+        return {
+            "enabled": self.enabled,
+            "running": self.is_running,
+            "interval_hours": self.backup_interval_hours,
+            "keep_count": self.keep_count,
+            "next_run": next_run
+        }
+
+
+# Global scheduler instance
+_scheduler_instance: Optional[BackupScheduler] = None
+
+
+def get_backup_scheduler() -> BackupScheduler:
+    """Get or create the global backup scheduler instance"""
+    global _scheduler_instance
+    if _scheduler_instance is None:
+        _scheduler_instance = BackupScheduler()
+    return _scheduler_instance

backend/services/database_backup.py

@@ -0,0 +1,192 @@
+"""
+Database Backup and Restore Service
+Handles full database snapshots, restoration, and remote synchronization
+"""
+
+import os
+import shutil
+import sqlite3
+from datetime import datetime
+from pathlib import Path
+from typing import List, Dict, Optional
+import json
+
+
+class DatabaseBackupService:
+    """Manages database backup operations"""
+
+    def __init__(self, db_path: str = "./data/seismo_fleet.db", backups_dir: str = "./data/backups"):
+        self.db_path = Path(db_path)
+        self.backups_dir = Path(backups_dir)
+        self.backups_dir.mkdir(parents=True, exist_ok=True)
+
+    def create_snapshot(self, description: Optional[str] = None) -> Dict:
+        """
+        Create a full database snapshot using SQLite backup API
+        Returns snapshot metadata
+        """
+        if not self.db_path.exists():
+            raise FileNotFoundError(f"Database not found at {self.db_path}")
+
+        # Generate snapshot filename with timestamp
+        timestamp = datetime.utcnow().strftime("%Y%m%d_%H%M%S")
+        snapshot_name = f"snapshot_{timestamp}.db"
+        snapshot_path = self.backups_dir / snapshot_name
+
+        # Get database size before backup
+        db_size = self.db_path.stat().st_size
+
+        try:
+            # Use SQLite backup API for safe backup (handles concurrent access)
+            source_conn = sqlite3.connect(str(self.db_path))
+            dest_conn = sqlite3.connect(str(snapshot_path))
+
+            # Perform the backup
+            with dest_conn:
+                source_conn.backup(dest_conn)
+
+            source_conn.close()
+            dest_conn.close()
+
+            # Create metadata
+            metadata = {
+                "filename": snapshot_name,
+                "created_at": timestamp,
+                "created_at_iso": datetime.utcnow().isoformat(),
+                "description": description or "Manual snapshot",
+                "size_bytes": snapshot_path.stat().st_size,
+                "size_mb": round(snapshot_path.stat().st_size / (1024 * 1024), 2),
+                "original_db_size_bytes": db_size,
+                "type": "manual"
+            }
+
+            # Save metadata as JSON sidecar file
+            metadata_path = self.backups_dir / f"{snapshot_name}.meta.json"
+            with open(metadata_path, 'w') as f:
+                json.dump(metadata, f, indent=2)
+
+            return metadata
+
+        except Exception as e:
+            # Clean up partial snapshot if it exists
+            if snapshot_path.exists():
+                snapshot_path.unlink()
+            raise Exception(f"Snapshot creation failed: {str(e)}")
+
+    def list_snapshots(self) -> List[Dict]:
+        """
+        List all available snapshots with metadata
+        Returns list sorted by creation date (newest first)
+        """
+        snapshots = []
+
+        for db_file in sorted(self.backups_dir.glob("snapshot_*.db"), reverse=True):
+            metadata_file = self.backups_dir / f"{db_file.name}.meta.json"
+
+            if metadata_file.exists():
+                with open(metadata_file, 'r') as f:
+                    metadata = json.load(f)
+            else:
+                # Fallback for legacy snapshots without metadata
+                stat_info = db_file.stat()
+                metadata = {
+                    "filename": db_file.name,
+                    "created_at": datetime.fromtimestamp(stat_info.st_mtime).strftime("%Y%m%d_%H%M%S"),
+                    "created_at_iso": datetime.fromtimestamp(stat_info.st_mtime).isoformat(),
+                    "description": "Legacy snapshot",
+                    "size_bytes": stat_info.st_size,
+                    "size_mb": round(stat_info.st_size / (1024 * 1024), 2),
+                    "type": "manual"
+                }
+
+            snapshots.append(metadata)
+
+        return snapshots
+
+    def delete_snapshot(self, filename: str) -> bool:
+        """Delete a snapshot and its metadata"""
+        snapshot_path = self.backups_dir / filename
+        metadata_path = self.backups_dir / f"{filename}.meta.json"
+
+        if not snapshot_path.exists():
+            raise FileNotFoundError(f"Snapshot {filename} not found")
+
+        snapshot_path.unlink()
+        if metadata_path.exists():
+            metadata_path.unlink()
+
+        return True
+
+    def restore_snapshot(self, filename: str, create_backup_before_restore: bool = True) -> Dict:
+        """
+        Restore database from a snapshot
+        Creates a safety backup before restoring if requested
+        """
+        snapshot_path = self.backups_dir / filename
+
+        if not snapshot_path.exists():
+            raise FileNotFoundError(f"Snapshot {filename} not found")
+
+        if not self.db_path.exists():
+            raise FileNotFoundError(f"Database not found at {self.db_path}")
+
+        backup_info = None
+
+        # Create safety backup before restore
+        if create_backup_before_restore:
+            backup_info = self.create_snapshot(description="Auto-backup before restore")
+
+        try:
+            # Replace database file
+            shutil.copy2(str(snapshot_path), str(self.db_path))
+
+            return {
+                "message": "Database restored successfully",
+                "restored_from": filename,
+                "restored_at": datetime.utcnow().isoformat(),
+                "backup_created": backup_info["filename"] if backup_info else None
+            }
+
+        except Exception as e:
+            raise Exception(f"Restore failed: {str(e)}")
+
+    def get_database_stats(self) -> Dict:
+        """Get statistics about the current database"""
+        if not self.db_path.exists():
+            return {"error": "Database not found"}
+
+        conn = sqlite3.connect(str(self.db_path))
+        cursor = conn.cursor()
+
+        # Get table counts
+        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'")
+        tables = cursor.fetchall()
+
+        table_stats = {}
+        total_rows = 0
+
+        for (table_name,) in tables:
+            cursor.execute(f"SELECT COUNT(*) FROM {table_name}")
+            count = cursor.fetchone()[0]
+            table_stats[table_name] = count
+            total_rows += count
+
+        conn.close()
+
+        db_size = self.db_path.stat().st_size
+
+        return {
+            "database_path": str(self.db_path),
+            "size_bytes": db_size,
+            "size_mb": round(db_size / (1024 * 1024), 2),
+            "total_rows": total_rows,
+            "tables": table_stats,
+            "last_modified": datetime.fromtimestamp(self.db_path.stat().st_mtime).isoformat()
+        }
+
+    def download_snapshot(self, filename: str) -> Path:
+        """Get the file path for downloading a snapshot"""
+        snapshot_path = self.backups_dir / filename
+        if not snapshot_path.exists():
+            raise FileNotFoundError(f"Snapshot {filename} not found")
+        return snapshot_path

backend/services/device_controller.py

@@ -0,0 +1,603 @@
+"""
+Device Controller Service
+
+Routes device operations to the appropriate backend module:
+- SLMM for sound level meters
+- SFM for seismographs (future implementation)
+
+This abstraction allows Projects system to work with any device type
+without knowing the underlying communication protocol.
+"""
+
+from typing import Dict, Any, Optional, List
+from backend.services.slmm_client import get_slmm_client, SLMMClientError
+
+
+class DeviceControllerError(Exception):
+    """Base exception for device controller errors."""
+    pass
+
+
+class UnsupportedDeviceTypeError(DeviceControllerError):
+    """Raised when device type is not supported."""
+    pass
+
+
+class DeviceController:
+    """
+    Unified interface for controlling all device types.
+
+    Routes commands to appropriate backend module based on device_type.
+
+    Usage:
+        controller = DeviceController()
+        await controller.start_recording("nl43-001", "slm", config={})
+        await controller.stop_recording("seismo-042", "seismograph")
+    """
+
+    def __init__(self):
+        self.slmm_client = get_slmm_client()
+
+    # ========================================================================
+    # Recording Control
+    # ========================================================================
+
+    async def start_recording(
+        self,
+        unit_id: str,
+        device_type: str,
+        config: Optional[Dict[str, Any]] = None,
+    ) -> Dict[str, Any]:
+        """
+        Start recording on a device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+            config: Device-specific recording configuration
+
+        Returns:
+            Response dict from device module
+
+        Raises:
+            UnsupportedDeviceTypeError: Device type not supported
+            DeviceControllerError: Operation failed
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.start_recording(unit_id, config)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            # TODO: Implement SFM client for seismograph control
+            # For now, return a placeholder response
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph recording control not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(
+                f"Device type '{device_type}' is not supported. "
+                f"Supported types: slm, seismograph"
+            )
+
+    async def stop_recording(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Stop recording on a device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Response dict from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.stop_recording(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            # TODO: Implement SFM client
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph recording control not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    async def pause_recording(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Pause recording on a device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Response dict from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.pause_recording(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph pause not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    async def resume_recording(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Resume paused recording on a device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Response dict from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.resume_recording(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph resume not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    # ========================================================================
+    # Status & Monitoring
+    # ========================================================================
+
+    async def get_device_status(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Get current device status.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Status dict from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.get_unit_status(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            # TODO: Implement SFM status check
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph status not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    async def get_live_data(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Get live data from device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Live data dict from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.get_live_data(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph live data not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    # ========================================================================
+    # Data Download
+    # ========================================================================
+
+    async def download_files(
+        self,
+        unit_id: str,
+        device_type: str,
+        destination_path: str,
+        files: Optional[List[str]] = None,
+    ) -> Dict[str, Any]:
+        """
+        Download data files from device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+            destination_path: Local path to save files
+            files: List of filenames, or None for all
+
+        Returns:
+            Download result with file list
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.download_files(
+                    unit_id,
+                    destination_path,
+                    files,
+                )
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            # TODO: Implement SFM file download
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph file download not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    # ========================================================================
+    # FTP Control
+    # ========================================================================
+
+    async def enable_ftp(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Enable FTP server on device.
+
+        Must be called before downloading files.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Response dict with status
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.enable_ftp(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph FTP not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    async def disable_ftp(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Disable FTP server on device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Response dict with status
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.disable_ftp(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph FTP not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    # ========================================================================
+    # Device Configuration
+    # ========================================================================
+
+    async def update_device_config(
+        self,
+        unit_id: str,
+        device_type: str,
+        config: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """
+        Update device configuration.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+            config: Configuration parameters
+
+        Returns:
+            Updated config from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.update_unit_config(
+                    unit_id,
+                    host=config.get("host"),
+                    tcp_port=config.get("tcp_port"),
+                    ftp_port=config.get("ftp_port"),
+                    ftp_username=config.get("ftp_username"),
+                    ftp_password=config.get("ftp_password"),
+                )
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph config update not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    # ========================================================================
+    # Store/Index Management
+    # ========================================================================
+
+    async def increment_index(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Increment the store/index number on a device.
+
+        For SLMs, this increments the store name to prevent "overwrite data?" prompts.
+        Should be called before starting a new measurement if auto_increment_index is enabled.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Response dict with old_index and new_index
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.increment_index(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            # Seismographs may not have the same concept of store index
+            return {
+                "status": "not_applicable",
+                "message": "Index increment not applicable for seismographs",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    async def get_index_number(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> Dict[str, Any]:
+        """
+        Get current store/index number from device.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            Response dict with current index_number
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.get_index_number(unit_id)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_applicable",
+                "message": "Index number not applicable for seismographs",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    # ========================================================================
+    # Cycle Commands (for scheduled automation)
+    # ========================================================================
+
+    async def start_cycle(
+        self,
+        unit_id: str,
+        device_type: str,
+        sync_clock: bool = True,
+    ) -> Dict[str, Any]:
+        """
+        Execute complete start cycle for scheduled automation.
+
+        This handles the full pre-recording workflow:
+        1. Sync device clock to server time
+        2. Find next safe index (with overwrite protection)
+        3. Start measurement
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+            sync_clock: Whether to sync device clock to server time
+
+        Returns:
+            Response dict from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.start_cycle(unit_id, sync_clock)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph start cycle not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    async def stop_cycle(
+        self,
+        unit_id: str,
+        device_type: str,
+        download: bool = True,
+    ) -> Dict[str, Any]:
+        """
+        Execute complete stop cycle for scheduled automation.
+
+        This handles the full post-recording workflow:
+        1. Stop measurement
+        2. Enable FTP
+        3. Download measurement folder
+        4. Verify download
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+            download: Whether to download measurement data
+
+        Returns:
+            Response dict from device module
+        """
+        if device_type == "slm":
+            try:
+                return await self.slmm_client.stop_cycle(unit_id, download)
+            except SLMMClientError as e:
+                raise DeviceControllerError(f"SLMM error: {str(e)}")
+
+        elif device_type == "seismograph":
+            return {
+                "status": "not_implemented",
+                "message": "Seismograph stop cycle not yet implemented",
+                "unit_id": unit_id,
+            }
+
+        else:
+            raise UnsupportedDeviceTypeError(f"Unsupported device type: {device_type}")
+
+    # ========================================================================
+    # Health Check
+    # ========================================================================
+
+    async def check_device_connectivity(
+        self,
+        unit_id: str,
+        device_type: str,
+    ) -> bool:
+        """
+        Check if device is reachable.
+
+        Args:
+            unit_id: Unit identifier
+            device_type: "slm" | "seismograph"
+
+        Returns:
+            True if device is reachable, False otherwise
+        """
+        if device_type == "slm":
+            try:
+                status = await self.slmm_client.get_unit_status(unit_id)
+                return status.get("last_seen") is not None
+            except:
+                return False
+
+        elif device_type == "seismograph":
+            # TODO: Implement SFM connectivity check
+            return False
+
+        else:
+            return False
+
+
+# Singleton instance
+_default_controller: Optional[DeviceController] = None
+
+
+def get_device_controller() -> DeviceController:
+    """
+    Get the default device controller instance.
+
+    Returns:
+        DeviceController instance
+    """
+    global _default_controller
+    if _default_controller is None:
+        _default_controller = DeviceController()
+    return _default_controller

backend/services/device_status_monitor.py

@@ -0,0 +1,184 @@
+"""
+Device Status Monitor
+
+Background task that monitors device reachability via SLMM polling status
+and triggers alerts when devices go offline or come back online.
+
+This service bridges SLMM's device polling with Terra-View's alert system.
+"""
+
+import asyncio
+import logging
+from datetime import datetime
+from typing import Optional, Dict
+
+from backend.database import SessionLocal
+from backend.services.slmm_client import get_slmm_client, SLMMClientError
+from backend.services.alert_service import get_alert_service
+
+logger = logging.getLogger(__name__)
+
+
+class DeviceStatusMonitor:
+    """
+    Monitors device reachability via SLMM's polling status endpoint.
+
+    Detects state transitions (online→offline, offline→online) and
+    triggers AlertService to create/resolve alerts.
+
+    Usage:
+        monitor = DeviceStatusMonitor()
+        await monitor.start()  # Start background monitoring
+        monitor.stop()  # Stop monitoring
+    """
+
+    def __init__(self, check_interval: int = 60):
+        """
+        Initialize the monitor.
+
+        Args:
+            check_interval: Seconds between status checks (default: 60)
+        """
+        self.check_interval = check_interval
+        self.running = False
+        self.task: Optional[asyncio.Task] = None
+        self.slmm_client = get_slmm_client()
+
+        # Track previous device states to detect transitions
+        self._device_states: Dict[str, bool] = {}
+
+    async def start(self):
+        """Start the monitoring background task."""
+        if self.running:
+            logger.warning("DeviceStatusMonitor is already running")
+            return
+
+        self.running = True
+        self.task = asyncio.create_task(self._monitor_loop())
+        logger.info(f"DeviceStatusMonitor started (checking every {self.check_interval}s)")
+
+    def stop(self):
+        """Stop the monitoring background task."""
+        self.running = False
+        if self.task:
+            self.task.cancel()
+        logger.info("DeviceStatusMonitor stopped")
+
+    async def _monitor_loop(self):
+        """Main monitoring loop."""
+        while self.running:
+            try:
+                await self._check_all_devices()
+            except Exception as e:
+                logger.error(f"Error in device status monitor: {e}", exc_info=True)
+
+            # Sleep in small intervals for graceful shutdown
+            for _ in range(self.check_interval):
+                if not self.running:
+                    break
+                await asyncio.sleep(1)
+
+        logger.info("DeviceStatusMonitor loop exited")
+
+    async def _check_all_devices(self):
+        """
+        Fetch polling status from SLMM and detect state transitions.
+
+        Uses GET /api/slmm/_polling/status (proxied to SLMM)
+        """
+        try:
+            # Get status from SLMM
+            status_response = await self.slmm_client.get_polling_status()
+            devices = status_response.get("devices", [])
+
+            if not devices:
+                logger.debug("No devices in polling status response")
+                return
+
+            db = SessionLocal()
+            try:
+                alert_service = get_alert_service(db)
+
+                for device in devices:
+                    unit_id = device.get("unit_id")
+                    if not unit_id:
+                        continue
+
+                    is_reachable = device.get("is_reachable", True)
+                    previous_reachable = self._device_states.get(unit_id)
+
+                    # Skip if this is the first check (no previous state)
+                    if previous_reachable is None:
+                        self._device_states[unit_id] = is_reachable
+                        logger.debug(f"Initial state for {unit_id}: reachable={is_reachable}")
+                        continue
+
+                    # Detect offline transition (was online, now offline)
+                    if previous_reachable and not is_reachable:
+                        logger.warning(f"Device {unit_id} went OFFLINE")
+                        alert_service.create_device_offline_alert(
+                            unit_id=unit_id,
+                            consecutive_failures=device.get("consecutive_failures", 0),
+                            last_error=device.get("last_error"),
+                        )
+
+                    # Detect online transition (was offline, now online)
+                    elif not previous_reachable and is_reachable:
+                        logger.info(f"Device {unit_id} came back ONLINE")
+                        alert_service.resolve_device_offline_alert(unit_id)
+
+                    # Update tracked state
+                    self._device_states[unit_id] = is_reachable
+
+                # Cleanup expired alerts while we're here
+                alert_service.cleanup_expired_alerts()
+
+            finally:
+                db.close()
+
+        except SLMMClientError as e:
+            logger.warning(f"Could not reach SLMM for status check: {e}")
+        except Exception as e:
+            logger.error(f"Error checking device status: {e}", exc_info=True)
+
+    def get_tracked_devices(self) -> Dict[str, bool]:
+        """
+        Get the current tracked device states.
+
+        Returns:
+            Dict mapping unit_id to is_reachable status
+        """
+        return dict(self._device_states)
+
+    def clear_tracked_devices(self):
+        """Clear all tracked device states (useful for testing)."""
+        self._device_states.clear()
+
+
+# Singleton instance
+_monitor_instance: Optional[DeviceStatusMonitor] = None
+
+
+def get_device_status_monitor() -> DeviceStatusMonitor:
+    """
+    Get the device status monitor singleton instance.
+
+    Returns:
+        DeviceStatusMonitor instance
+    """
+    global _monitor_instance
+    if _monitor_instance is None:
+        _monitor_instance = DeviceStatusMonitor()
+    return _monitor_instance
+
+
+async def start_device_status_monitor():
+    """Start the global device status monitor."""
+    monitor = get_device_status_monitor()
+    await monitor.start()
+
+
+def stop_device_status_monitor():
+    """Stop the global device status monitor."""
+    monitor = get_device_status_monitor()
+    monitor.stop()

backend/services/fleet_calendar_service.py

@@ -0,0 +1,725 @@
+"""
+Fleet Calendar Service
+
+Business logic for:
+- Calculating unit availability on any given date
+- Calibration status tracking (valid, expiring soon, expired)
+- Job reservation management
+- Conflict detection (calibration expires mid-job)
+"""
+
+from datetime import date, datetime, timedelta
+from typing import Dict, List, Optional, Tuple
+from sqlalchemy.orm import Session
+from sqlalchemy import and_, or_
+
+from backend.models import (
+    RosterUnit, JobReservation, JobReservationUnit,
+    UserPreferences, Project, DeploymentRecord
+)
+
+
+def get_calibration_status(
+    unit: RosterUnit,
+    check_date: date,
+    warning_days: int = 30
+) -> str:
+    """
+    Determine calibration status for a unit on a specific date.
+
+    Returns:
+        "valid" - Calibration is good on this date
+        "expiring_soon" - Within warning_days of expiry
+        "expired" - Calibration has expired
+        "needs_calibration" - No calibration date set
+    """
+    if not unit.last_calibrated:
+        return "needs_calibration"
+
+    # Calculate expiry date (1 year from last calibration)
+    expiry_date = unit.last_calibrated + timedelta(days=365)
+
+    if check_date >= expiry_date:
+        return "expired"
+    elif check_date >= expiry_date - timedelta(days=warning_days):
+        return "expiring_soon"
+    else:
+        return "valid"
+
+
+def get_unit_reservations_on_date(
+    db: Session,
+    unit_id: str,
+    check_date: date
+) -> List[JobReservation]:
+    """Get all reservations that include this unit on the given date."""
+
+    # Get reservation IDs that have this unit assigned
+    assigned_reservation_ids = db.query(JobReservationUnit.reservation_id).filter(
+        JobReservationUnit.unit_id == unit_id
+    ).subquery()
+
+    # Get reservations that:
+    # 1. Have this unit assigned AND date is within range
+    reservations = db.query(JobReservation).filter(
+        JobReservation.id.in_(assigned_reservation_ids),
+        JobReservation.start_date <= check_date,
+        JobReservation.end_date >= check_date
+    ).all()
+
+    return reservations
+
+
+def get_active_deployment(db: Session, unit_id: str) -> Optional[DeploymentRecord]:
+    """Return the active (unreturned) deployment record for a unit, or None."""
+    return (
+        db.query(DeploymentRecord)
+        .filter(
+            DeploymentRecord.unit_id == unit_id,
+            DeploymentRecord.actual_removal_date == None
+        )
+        .order_by(DeploymentRecord.created_at.desc())
+        .first()
+    )
+
+
+def is_unit_available_on_date(
+    db: Session,
+    unit: RosterUnit,
+    check_date: date,
+    warning_days: int = 30
+) -> Tuple[bool, str, Optional[str]]:
+    """
+    Check if a unit is available on a specific date.
+
+    Returns:
+        (is_available, status, reservation_name)
+        - is_available: True if unit can be assigned to new work
+        - status: "available", "reserved", "expired", "retired", "needs_calibration", "in_field"
+        - reservation_name: Name of blocking reservation or project ref (if any)
+    """
+    # Check if retired
+    if unit.retired:
+        return False, "retired", None
+
+    # Check calibration status
+    cal_status = get_calibration_status(unit, check_date, warning_days)
+    if cal_status == "expired":
+        return False, "expired", None
+    if cal_status == "needs_calibration":
+        return False, "needs_calibration", None
+
+    # Check for an active deployment record (unit is physically in the field)
+    active_deployment = get_active_deployment(db, unit.id)
+    if active_deployment:
+        label = active_deployment.project_ref or "Field deployment"
+        return False, "in_field", label
+
+    # Check if already reserved
+    reservations = get_unit_reservations_on_date(db, unit.id, check_date)
+    if reservations:
+        return False, "reserved", reservations[0].name
+
+    # Unit is available (even if expiring soon - that's just a warning)
+    return True, "available", None
+
+
+def get_day_summary(
+    db: Session,
+    check_date: date,
+    device_type: str = "seismograph"
+) -> Dict:
+    """
+    Get a complete summary of fleet status for a specific day.
+
+    Returns dict with:
+        - available_units: List of available unit IDs with calibration info
+        - reserved_units: List of reserved unit IDs with reservation info
+        - expired_units: List of units with expired calibration
+        - expiring_soon_units: List of units expiring within warning period
+        - reservations: List of active reservations on this date
+        - counts: Summary counts
+    """
+    # Get user preferences for warning days
+    prefs = db.query(UserPreferences).filter_by(id=1).first()
+    warning_days = prefs.calibration_warning_days if prefs else 30
+
+    # Get all non-retired units of the specified device type
+    units = db.query(RosterUnit).filter(
+        RosterUnit.device_type == device_type,
+        RosterUnit.retired == False
+    ).all()
+
+    available_units = []
+    reserved_units = []
+    expired_units = []
+    expiring_soon_units = []
+    needs_calibration_units = []
+    in_field_units = []
+    cal_expiring_today = []  # Units whose calibration expires ON this day
+
+    for unit in units:
+        is_avail, status, reservation_name = is_unit_available_on_date(
+            db, unit, check_date, warning_days
+        )
+
+        cal_status = get_calibration_status(unit, check_date, warning_days)
+        expiry_date = None
+        if unit.last_calibrated:
+            expiry_date = (unit.last_calibrated + timedelta(days=365)).isoformat()
+
+        unit_info = {
+            "id": unit.id,
+            "last_calibrated": unit.last_calibrated.isoformat() if unit.last_calibrated else None,
+            "expiry_date": expiry_date,
+            "calibration_status": cal_status,
+            "deployed": unit.deployed,
+            "note": unit.note or ""
+        }
+
+        # Check if calibration expires ON this specific day
+        if unit.last_calibrated:
+            unit_expiry_date = unit.last_calibrated + timedelta(days=365)
+            if unit_expiry_date == check_date:
+                cal_expiring_today.append(unit_info)
+
+        if status == "available":
+            available_units.append(unit_info)
+            if cal_status == "expiring_soon":
+                expiring_soon_units.append(unit_info)
+        elif status == "in_field":
+            unit_info["project_ref"] = reservation_name
+            in_field_units.append(unit_info)
+        elif status == "reserved":
+            unit_info["reservation_name"] = reservation_name
+            reserved_units.append(unit_info)
+            if cal_status == "expiring_soon":
+                expiring_soon_units.append(unit_info)
+        elif status == "expired":
+            expired_units.append(unit_info)
+        elif status == "needs_calibration":
+            needs_calibration_units.append(unit_info)
+
+    # Get active reservations on this date
+    reservations = db.query(JobReservation).filter(
+        JobReservation.device_type == device_type,
+        JobReservation.start_date <= check_date,
+        JobReservation.end_date >= check_date
+    ).all()
+
+    reservation_list = []
+    for res in reservations:
+        # Count assigned units for this reservation
+        assigned_count = db.query(JobReservationUnit).filter(
+            JobReservationUnit.reservation_id == res.id
+        ).count()
+
+        reservation_list.append({
+            "id": res.id,
+            "name": res.name,
+            "start_date": res.start_date.isoformat(),
+            "end_date": res.end_date.isoformat(),
+            "assignment_type": res.assignment_type,
+            "quantity_needed": res.quantity_needed,
+            "assigned_count": assigned_count,
+            "color": res.color,
+            "project_id": res.project_id
+        })
+
+    return {
+        "date": check_date.isoformat(),
+        "device_type": device_type,
+        "available_units": available_units,
+        "in_field_units": in_field_units,
+        "reserved_units": reserved_units,
+        "expired_units": expired_units,
+        "expiring_soon_units": expiring_soon_units,
+        "needs_calibration_units": needs_calibration_units,
+        "cal_expiring_today": cal_expiring_today,
+        "reservations": reservation_list,
+        "counts": {
+            "available": len(available_units),
+            "in_field": len(in_field_units),
+            "reserved": len(reserved_units),
+            "expired": len(expired_units),
+            "expiring_soon": len(expiring_soon_units),
+            "needs_calibration": len(needs_calibration_units),
+            "cal_expiring_today": len(cal_expiring_today),
+            "total": len(units)
+        }
+    }
+
+
+def get_calendar_year_data(
+    db: Session,
+    year: int,
+    device_type: str = "seismograph"
+) -> Dict:
+    """
+    Get calendar data for an entire year.
+
+    For performance, this returns summary counts per day rather than
+    full unit lists. Use get_day_summary() for detailed day data.
+    """
+    # Get user preferences
+    prefs = db.query(UserPreferences).filter_by(id=1).first()
+    warning_days = prefs.calibration_warning_days if prefs else 30
+
+    # Get all units
+    units = db.query(RosterUnit).filter(
+        RosterUnit.device_type == device_type,
+        RosterUnit.retired == False
+    ).all()
+
+    # Get all reservations that overlap with this year
+    # Include TBD reservations (end_date is null) that started before year end
+    year_start = date(year, 1, 1)
+    year_end = date(year, 12, 31)
+
+    reservations = db.query(JobReservation).filter(
+        JobReservation.device_type == device_type,
+        JobReservation.start_date <= year_end,
+        or_(
+            JobReservation.end_date >= year_start,
+            JobReservation.end_date == None  # TBD reservations
+        )
+    ).all()
+
+    # Get all unit assignments for these reservations
+    reservation_ids = [r.id for r in reservations]
+    assignments = db.query(JobReservationUnit).filter(
+        JobReservationUnit.reservation_id.in_(reservation_ids)
+    ).all() if reservation_ids else []
+
+    # Build a lookup: unit_id -> list of (start_date, end_date, reservation_name)
+    # For TBD reservations, use estimated_end_date if available, or a far future date
+    unit_reservations = {}
+    for res in reservations:
+        res_assignments = [a for a in assignments if a.reservation_id == res.id]
+        for assignment in res_assignments:
+            unit_id = assignment.unit_id
+            # Use unit-specific dates if set, otherwise use reservation dates
+            start_d = assignment.unit_start_date or res.start_date
+            if assignment.unit_end_tbd or (assignment.unit_end_date is None and res.end_date_tbd):
+                # TBD: use estimated date or far future for availability calculation
+                end_d = res.estimated_end_date or date(year + 5, 12, 31)
+            else:
+                end_d = assignment.unit_end_date or res.end_date or date(year + 5, 12, 31)
+
+            if unit_id not in unit_reservations:
+                unit_reservations[unit_id] = []
+            unit_reservations[unit_id].append((start_d, end_d, res.name))
+
+    # Build set of unit IDs that have an active deployment record (still in the field)
+    unit_ids = [u.id for u in units]
+    active_deployments = db.query(DeploymentRecord.unit_id).filter(
+        DeploymentRecord.unit_id.in_(unit_ids),
+        DeploymentRecord.actual_removal_date == None
+    ).all()
+    unit_in_field = {row.unit_id for row in active_deployments}
+
+    # Generate data for each month
+    months_data = {}
+
+    for month in range(1, 13):
+        # Get first and last day of month
+        first_day = date(year, month, 1)
+        if month == 12:
+            last_day = date(year, 12, 31)
+        else:
+            last_day = date(year, month + 1, 1) - timedelta(days=1)
+
+        days_data = {}
+        current_day = first_day
+
+        while current_day <= last_day:
+            available = 0
+            in_field = 0
+            reserved = 0
+            expired = 0
+            expiring_soon = 0
+            needs_cal = 0
+            cal_expiring_on_day = 0  # Units whose calibration expires ON this day
+            cal_expired_on_day = 0   # Units whose calibration expired ON this day
+
+            for unit in units:
+                # Check calibration
+                cal_status = get_calibration_status(unit, current_day, warning_days)
+
+                # Check if calibration expires/expired ON this specific day
+                if unit.last_calibrated:
+                    unit_expiry = unit.last_calibrated + timedelta(days=365)
+                    if unit_expiry == current_day:
+                        cal_expiring_on_day += 1
+                    # Check if expired yesterday (first day of being expired)
+                    elif unit_expiry == current_day - timedelta(days=1):
+                        cal_expired_on_day += 1
+
+                if cal_status == "expired":
+                    expired += 1
+                    continue
+                if cal_status == "needs_calibration":
+                    needs_cal += 1
+                    continue
+
+                # Check active deployment record (in field)
+                if unit.id in unit_in_field:
+                    in_field += 1
+                    continue
+
+                # Check if reserved
+                is_reserved = False
+                if unit.id in unit_reservations:
+                    for start_d, end_d, _ in unit_reservations[unit.id]:
+                        if start_d <= current_day <= end_d:
+                            is_reserved = True
+                            break
+
+                if is_reserved:
+                    reserved += 1
+                else:
+                    available += 1
+
+                if cal_status == "expiring_soon":
+                    expiring_soon += 1
+
+            days_data[current_day.day] = {
+                "available": available,
+                "in_field": in_field,
+                "reserved": reserved,
+                "expired": expired,
+                "expiring_soon": expiring_soon,
+                "needs_calibration": needs_cal,
+                "cal_expiring_on_day": cal_expiring_on_day,
+                "cal_expired_on_day": cal_expired_on_day
+            }
+
+            current_day += timedelta(days=1)
+
+        months_data[month] = {
+            "name": first_day.strftime("%B"),
+            "short_name": first_day.strftime("%b"),
+            "days": days_data,
+            "first_weekday": first_day.weekday(),  # 0=Monday, 6=Sunday
+            "num_days": last_day.day
+        }
+
+    # Also include reservation summary for the year
+    reservation_list = []
+    for res in reservations:
+        assigned_count = len([a for a in assignments if a.reservation_id == res.id])
+        reservation_list.append({
+            "id": res.id,
+            "name": res.name,
+            "start_date": res.start_date.isoformat(),
+            "end_date": res.end_date.isoformat(),
+            "quantity_needed": res.quantity_needed,
+            "assigned_count": assigned_count,
+            "color": res.color
+        })
+
+    return {
+        "year": year,
+        "device_type": device_type,
+        "months": months_data,
+        "reservations": reservation_list,
+        "total_units": len(units)
+    }
+
+
+def get_rolling_calendar_data(
+    db: Session,
+    start_year: int,
+    start_month: int,
+    device_type: str = "seismograph"
+) -> Dict:
+    """
+    Get calendar data for 12 months starting from a specific month/year.
+
+    This supports the rolling calendar view where users can scroll through
+    months one at a time, viewing any 12-month window.
+    """
+    # Get user preferences
+    prefs = db.query(UserPreferences).filter_by(id=1).first()
+    warning_days = prefs.calibration_warning_days if prefs else 30
+
+    # Get all units
+    units = db.query(RosterUnit).filter(
+        RosterUnit.device_type == device_type,
+        RosterUnit.retired == False
+    ).all()
+
+    # Calculate the date range for 12 months
+    first_date = date(start_year, start_month, 1)
+    # Calculate end date (12 months later)
+    end_year = start_year + 1 if start_month == 1 else start_year
+    end_month = 12 if start_month == 1 else start_month - 1
+    if start_month == 1:
+        end_year = start_year
+        end_month = 12
+    else:
+        # 12 months from start_month means we end at start_month - 1 next year
+        end_year = start_year + 1
+        end_month = start_month - 1
+
+    # Actually, simpler: go 11 months forward from start
+    end_year = start_year + ((start_month + 10) // 12)
+    end_month = ((start_month + 10) % 12) + 1
+    if end_month == 12:
+        last_date = date(end_year, 12, 31)
+    else:
+        last_date = date(end_year, end_month + 1, 1) - timedelta(days=1)
+
+    # Get all reservations that overlap with this 12-month range
+    reservations = db.query(JobReservation).filter(
+        JobReservation.device_type == device_type,
+        JobReservation.start_date <= last_date,
+        or_(
+            JobReservation.end_date >= first_date,
+            JobReservation.end_date == None  # TBD reservations
+        )
+    ).all()
+
+    # Get all unit assignments for these reservations
+    reservation_ids = [r.id for r in reservations]
+    assignments = db.query(JobReservationUnit).filter(
+        JobReservationUnit.reservation_id.in_(reservation_ids)
+    ).all() if reservation_ids else []
+
+    # Build a lookup: unit_id -> list of (start_date, end_date, reservation_name)
+    unit_reservations = {}
+    for res in reservations:
+        res_assignments = [a for a in assignments if a.reservation_id == res.id]
+        for assignment in res_assignments:
+            unit_id = assignment.unit_id
+            start_d = assignment.unit_start_date or res.start_date
+            if assignment.unit_end_tbd or (assignment.unit_end_date is None and res.end_date_tbd):
+                end_d = res.estimated_end_date or date(start_year + 5, 12, 31)
+            else:
+                end_d = assignment.unit_end_date or res.end_date or date(start_year + 5, 12, 31)
+
+            if unit_id not in unit_reservations:
+                unit_reservations[unit_id] = []
+            unit_reservations[unit_id].append((start_d, end_d, res.name))
+
+    # Build set of unit IDs that have an active deployment record (still in the field)
+    unit_ids = [u.id for u in units]
+    active_deployments = db.query(DeploymentRecord.unit_id).filter(
+        DeploymentRecord.unit_id.in_(unit_ids),
+        DeploymentRecord.actual_removal_date == None
+    ).all()
+    unit_in_field = {row.unit_id for row in active_deployments}
+
+    # Generate data for each of the 12 months
+    months_data = []
+    current_year = start_year
+    current_month = start_month
+
+    for i in range(12):
+        # Calculate this month's year and month
+        m_year = start_year + ((start_month - 1 + i) // 12)
+        m_month = ((start_month - 1 + i) % 12) + 1
+
+        first_day = date(m_year, m_month, 1)
+        if m_month == 12:
+            last_day = date(m_year, 12, 31)
+        else:
+            last_day = date(m_year, m_month + 1, 1) - timedelta(days=1)
+
+        days_data = {}
+        current_day = first_day
+
+        while current_day <= last_day:
+            available = 0
+            reserved = 0
+            expired = 0
+            expiring_soon = 0
+            needs_cal = 0
+            cal_expiring_on_day = 0
+            cal_expired_on_day = 0
+
+            for unit in units:
+                cal_status = get_calibration_status(unit, current_day, warning_days)
+
+                if unit.last_calibrated:
+                    unit_expiry = unit.last_calibrated + timedelta(days=365)
+                    if unit_expiry == current_day:
+                        cal_expiring_on_day += 1
+                    elif unit_expiry == current_day - timedelta(days=1):
+                        cal_expired_on_day += 1
+
+                if cal_status == "expired":
+                    expired += 1
+                    continue
+                if cal_status == "needs_calibration":
+                    needs_cal += 1
+                    continue
+
+                is_reserved = False
+                if unit.id in unit_reservations:
+                    for start_d, end_d, _ in unit_reservations[unit.id]:
+                        if start_d <= current_day <= end_d:
+                            is_reserved = True
+                            break
+
+                if is_reserved:
+                    reserved += 1
+                else:
+                    available += 1
+
+                if cal_status == "expiring_soon":
+                    expiring_soon += 1
+
+            days_data[current_day.day] = {
+                "available": available,
+                "reserved": reserved,
+                "expired": expired,
+                "expiring_soon": expiring_soon,
+                "needs_calibration": needs_cal,
+                "cal_expiring_on_day": cal_expiring_on_day,
+                "cal_expired_on_day": cal_expired_on_day
+            }
+
+            current_day += timedelta(days=1)
+
+        months_data.append({
+            "year": m_year,
+            "month": m_month,
+            "name": first_day.strftime("%B"),
+            "short_name": first_day.strftime("%b"),
+            "year_short": first_day.strftime("%y"),
+            "days": days_data,
+            "first_weekday": first_day.weekday(),
+            "num_days": last_day.day
+        })
+
+    return {
+        "start_year": start_year,
+        "start_month": start_month,
+        "device_type": device_type,
+        "months": months_data,
+        "total_units": len(units)
+    }
+
+
+def check_calibration_conflicts(
+    db: Session,
+    reservation_id: str
+) -> List[Dict]:
+    """
+    Check if any units assigned to a reservation will have their
+    calibration expire during the reservation period.
+
+    Returns list of conflicts with unit info and expiry date.
+    """
+    reservation = db.query(JobReservation).filter_by(id=reservation_id).first()
+    if not reservation:
+        return []
+
+    # Get assigned units
+    assigned = db.query(JobReservationUnit).filter_by(
+        reservation_id=reservation_id
+    ).all()
+
+    conflicts = []
+    for assignment in assigned:
+        unit = db.query(RosterUnit).filter_by(id=assignment.unit_id).first()
+        if not unit or not unit.last_calibrated:
+            continue
+
+        expiry_date = unit.last_calibrated + timedelta(days=365)
+
+        # Check if expiry falls within reservation period
+        if reservation.start_date < expiry_date <= reservation.end_date:
+            conflicts.append({
+                "unit_id": unit.id,
+                "last_calibrated": unit.last_calibrated.isoformat(),
+                "expiry_date": expiry_date.isoformat(),
+                "reservation_name": reservation.name,
+                "days_into_job": (expiry_date - reservation.start_date).days
+            })
+
+    return conflicts
+
+
+def get_available_units_for_period(
+    db: Session,
+    start_date: date,
+    end_date: date,
+    device_type: str = "seismograph",
+    exclude_reservation_id: Optional[str] = None
+) -> List[Dict]:
+    """
+    Get units that are available for the entire specified period.
+
+    A unit is available if:
+    - Not retired
+    - Calibration is valid through the end date
+    - Not assigned to any other reservation that overlaps the period
+    """
+    prefs = db.query(UserPreferences).filter_by(id=1).first()
+    warning_days = prefs.calibration_warning_days if prefs else 30
+
+    units = db.query(RosterUnit).filter(
+        RosterUnit.device_type == device_type,
+        RosterUnit.retired == False
+    ).all()
+
+    # Get reservations that overlap with this period
+    overlapping_reservations = db.query(JobReservation).filter(
+        JobReservation.device_type == device_type,
+        JobReservation.start_date <= end_date,
+        JobReservation.end_date >= start_date
+    )
+
+    if exclude_reservation_id:
+        overlapping_reservations = overlapping_reservations.filter(
+            JobReservation.id != exclude_reservation_id
+        )
+
+    overlapping_reservations = overlapping_reservations.all()
+
+    # Get all units assigned to overlapping reservations
+    reserved_unit_ids = set()
+    for res in overlapping_reservations:
+        assigned = db.query(JobReservationUnit).filter_by(
+            reservation_id=res.id
+        ).all()
+        for a in assigned:
+            reserved_unit_ids.add(a.unit_id)
+
+    # Get units with active deployment records (still in the field)
+    unit_ids = [u.id for u in units]
+    active_deps = db.query(DeploymentRecord.unit_id).filter(
+        DeploymentRecord.unit_id.in_(unit_ids),
+        DeploymentRecord.actual_removal_date == None
+    ).all()
+    in_field_unit_ids = {row.unit_id for row in active_deps}
+
+    available_units = []
+    for unit in units:
+        # Check if already reserved
+        if unit.id in reserved_unit_ids:
+            continue
+        # Check if currently in the field
+        if unit.id in in_field_unit_ids:
+            continue
+
+        if unit.last_calibrated:
+            expiry_date = unit.last_calibrated + timedelta(days=365)
+            cal_status = get_calibration_status(unit, end_date, warning_days)
+        else:
+            expiry_date = None
+            cal_status = "needs_calibration"
+
+        available_units.append({
+            "id": unit.id,
+            "last_calibrated": unit.last_calibrated.isoformat() if unit.last_calibrated else None,
+            "expiry_date": expiry_date.isoformat() if expiry_date else None,
+            "calibration_status": cal_status,
+            "deployed": unit.deployed,
+            "out_for_calibration": unit.out_for_calibration or False,
+            "note": unit.note or ""
+        })
+
+    return available_units

backend/services/recurring_schedule_service.py

@@ -0,0 +1,611 @@
+"""
+Recurring Schedule Service
+
+Manages recurring schedule definitions and generates ScheduledAction
+instances based on patterns (weekly calendar, simple interval).
+"""
+
+import json
+import uuid
+import logging
+from datetime import datetime, timedelta, date, time
+from typing import Optional, List, Dict, Any, Tuple
+from zoneinfo import ZoneInfo
+
+from sqlalchemy.orm import Session
+from sqlalchemy import and_
+
+from backend.models import RecurringSchedule, ScheduledAction, MonitoringLocation, UnitAssignment, Project
+
+logger = logging.getLogger(__name__)
+
+# Day name mapping
+DAY_NAMES = ["monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"]
+
+
+class RecurringScheduleService:
+    """
+    Service for managing recurring schedules and generating ScheduledActions.
+
+    Supports two schedule types:
+    - weekly_calendar: Specific days with start/end times
+    - simple_interval: Daily stop/download/restart cycles for 24/7 monitoring
+    """
+
+    def __init__(self, db: Session):
+        self.db = db
+
+    def create_schedule(
+        self,
+        project_id: str,
+        location_id: str,
+        name: str,
+        schedule_type: str,
+        device_type: str = "slm",
+        unit_id: str = None,
+        weekly_pattern: dict = None,
+        interval_type: str = None,
+        cycle_time: str = None,
+        include_download: bool = True,
+        auto_increment_index: bool = True,
+        timezone: str = "America/New_York",
+        start_datetime: datetime = None,
+        end_datetime: datetime = None,
+    ) -> RecurringSchedule:
+        """
+        Create a new recurring schedule.
+
+        Args:
+            project_id: Project ID
+            location_id: Monitoring location ID
+            name: Schedule name
+            schedule_type: "weekly_calendar", "simple_interval", or "one_off"
+            device_type: "slm" or "seismograph"
+            unit_id: Specific unit (optional, can use assignment)
+            weekly_pattern: Dict of day patterns for weekly_calendar
+            interval_type: "daily" or "hourly" for simple_interval
+            cycle_time: Time string "HH:MM" for cycle
+            include_download: Whether to download data on cycle
+            auto_increment_index: Whether to auto-increment store index before start
+            timezone: Timezone for schedule times
+            start_datetime: Start date+time in UTC (one_off only)
+            end_datetime: End date+time in UTC (one_off only)
+
+        Returns:
+            Created RecurringSchedule
+        """
+        schedule = RecurringSchedule(
+            id=str(uuid.uuid4()),
+            project_id=project_id,
+            location_id=location_id,
+            unit_id=unit_id,
+            name=name,
+            schedule_type=schedule_type,
+            device_type=device_type,
+            weekly_pattern=json.dumps(weekly_pattern) if weekly_pattern else None,
+            interval_type=interval_type,
+            cycle_time=cycle_time,
+            include_download=include_download,
+            auto_increment_index=auto_increment_index,
+            enabled=True,
+            timezone=timezone,
+            start_datetime=start_datetime,
+            end_datetime=end_datetime,
+        )
+
+        # Calculate next occurrence
+        schedule.next_occurrence = self._calculate_next_occurrence(schedule)
+
+        self.db.add(schedule)
+        self.db.commit()
+        self.db.refresh(schedule)
+
+        logger.info(f"Created recurring schedule: {name} ({schedule_type})")
+        return schedule
+
+    def update_schedule(
+        self,
+        schedule_id: str,
+        **kwargs,
+    ) -> Optional[RecurringSchedule]:
+        """
+        Update a recurring schedule.
+
+        Args:
+            schedule_id: Schedule to update
+            **kwargs: Fields to update
+
+        Returns:
+            Updated schedule or None
+        """
+        schedule = self.db.query(RecurringSchedule).filter_by(id=schedule_id).first()
+        if not schedule:
+            return None
+
+        for key, value in kwargs.items():
+            if hasattr(schedule, key):
+                if key == "weekly_pattern" and isinstance(value, dict):
+                    value = json.dumps(value)
+                setattr(schedule, key, value)
+
+        # Recalculate next occurrence
+        schedule.next_occurrence = self._calculate_next_occurrence(schedule)
+
+        self.db.commit()
+        self.db.refresh(schedule)
+
+        logger.info(f"Updated recurring schedule: {schedule.name}")
+        return schedule
+
+    def delete_schedule(self, schedule_id: str) -> bool:
+        """
+        Delete a recurring schedule and its pending generated actions.
+
+        Args:
+            schedule_id: Schedule to delete
+
+        Returns:
+            True if deleted, False if not found
+        """
+        schedule = self.db.query(RecurringSchedule).filter_by(id=schedule_id).first()
+        if not schedule:
+            return False
+
+        # Delete pending generated actions for this schedule
+        # The schedule_id is stored in the notes field as JSON
+        pending_actions = self.db.query(ScheduledAction).filter(
+            and_(
+                ScheduledAction.execution_status == "pending",
+                ScheduledAction.notes.like(f'%"schedule_id": "{schedule_id}"%'),
+            )
+        ).all()
+
+        deleted_count = len(pending_actions)
+        for action in pending_actions:
+            self.db.delete(action)
+
+        self.db.delete(schedule)
+        self.db.commit()
+
+        logger.info(f"Deleted recurring schedule: {schedule.name} (and {deleted_count} pending actions)")
+        return True
+
+    def enable_schedule(self, schedule_id: str) -> Optional[RecurringSchedule]:
+        """Enable a disabled schedule."""
+        return self.update_schedule(schedule_id, enabled=True)
+
+    def disable_schedule(self, schedule_id: str) -> Optional[RecurringSchedule]:
+        """Disable a schedule and cancel its pending actions."""
+        schedule = self.update_schedule(schedule_id, enabled=False)
+        if schedule:
+            # Cancel all pending actions generated by this schedule
+            pending_actions = self.db.query(ScheduledAction).filter(
+                and_(
+                    ScheduledAction.execution_status == "pending",
+                    ScheduledAction.notes.like(f'%"schedule_id": "{schedule_id}"%'),
+                )
+            ).all()
+
+            for action in pending_actions:
+                action.execution_status = "cancelled"
+
+            if pending_actions:
+                self.db.commit()
+                logger.info(f"Cancelled {len(pending_actions)} pending actions for disabled schedule {schedule.name}")
+
+        return schedule
+
+    def generate_actions_for_schedule(
+        self,
+        schedule: RecurringSchedule,
+        horizon_days: int = 7,
+        preview_only: bool = False,
+    ) -> List[ScheduledAction]:
+        """
+        Generate ScheduledAction entries for the next N days based on pattern.
+
+        Args:
+            schedule: The recurring schedule
+            horizon_days: Days ahead to generate
+            preview_only: If True, don't save to DB (for preview)
+
+        Returns:
+            List of generated ScheduledAction instances
+        """
+        if not schedule.enabled:
+            return []
+
+        if schedule.schedule_type == "weekly_calendar":
+            actions = self._generate_weekly_calendar_actions(schedule, horizon_days)
+        elif schedule.schedule_type == "simple_interval":
+            actions = self._generate_interval_actions(schedule, horizon_days)
+        elif schedule.schedule_type == "one_off":
+            actions = self._generate_one_off_actions(schedule)
+        else:
+            logger.warning(f"Unknown schedule type: {schedule.schedule_type}")
+            return []
+
+        if not preview_only and actions:
+            for action in actions:
+                self.db.add(action)
+
+            schedule.last_generated_at = datetime.utcnow()
+            schedule.next_occurrence = self._calculate_next_occurrence(schedule)
+
+            self.db.commit()
+            logger.info(f"Generated {len(actions)} actions for schedule: {schedule.name}")
+
+        return actions
+
+    def _generate_weekly_calendar_actions(
+        self,
+        schedule: RecurringSchedule,
+        horizon_days: int,
+    ) -> List[ScheduledAction]:
+        """
+        Generate actions from weekly calendar pattern.
+
+        Pattern format:
+        {
+            "monday": {"enabled": true, "start": "19:00", "end": "07:00"},
+            "tuesday": {"enabled": false},
+            ...
+        }
+        """
+        if not schedule.weekly_pattern:
+            return []
+
+        try:
+            pattern = json.loads(schedule.weekly_pattern)
+        except json.JSONDecodeError:
+            logger.error(f"Invalid weekly_pattern JSON for schedule {schedule.id}")
+            return []
+
+        actions = []
+        tz = ZoneInfo(schedule.timezone)
+        now_utc = datetime.utcnow()
+        now_local = now_utc.replace(tzinfo=ZoneInfo("UTC")).astimezone(tz)
+
+        # Get unit_id (from schedule or assignment)
+        unit_id = self._resolve_unit_id(schedule)
+
+        for day_offset in range(horizon_days):
+            check_date = now_local.date() + timedelta(days=day_offset)
+            day_name = DAY_NAMES[check_date.weekday()]
+            day_config = pattern.get(day_name, {})
+
+            if not day_config.get("enabled", False):
+                continue
+
+            start_time_str = day_config.get("start")
+            end_time_str = day_config.get("end")
+
+            if not start_time_str or not end_time_str:
+                continue
+
+            # Parse times
+            start_time = self._parse_time(start_time_str)
+            end_time = self._parse_time(end_time_str)
+
+            if not start_time or not end_time:
+                continue
+
+            # Create start datetime in local timezone
+            start_local = datetime.combine(check_date, start_time, tzinfo=tz)
+            start_utc = start_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+
+            # Handle overnight schedules (end time is next day)
+            if end_time <= start_time:
+                end_date = check_date + timedelta(days=1)
+            else:
+                end_date = check_date
+
+            end_local = datetime.combine(end_date, end_time, tzinfo=tz)
+            end_utc = end_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+
+            # Skip if start time has already passed
+            if start_utc <= now_utc:
+                continue
+
+            # Check if action already exists
+            if self._action_exists(schedule.project_id, schedule.location_id, "start", start_utc):
+                continue
+
+            # Build notes with automation metadata
+            start_notes = json.dumps({
+                "schedule_name": schedule.name,
+                "schedule_id": schedule.id,
+                "auto_increment_index": schedule.auto_increment_index,
+            })
+
+            # Create START action
+            start_action = ScheduledAction(
+                id=str(uuid.uuid4()),
+                project_id=schedule.project_id,
+                location_id=schedule.location_id,
+                unit_id=unit_id,
+                action_type="start",
+                device_type=schedule.device_type,
+                scheduled_time=start_utc,
+                execution_status="pending",
+                notes=start_notes,
+            )
+            actions.append(start_action)
+
+            # Create STOP action (stop_cycle handles download when include_download is True)
+            stop_notes = json.dumps({
+                "schedule_name": schedule.name,
+                "schedule_id": schedule.id,
+                "schedule_type": "weekly_calendar",
+                "include_download": schedule.include_download,
+            })
+            stop_action = ScheduledAction(
+                id=str(uuid.uuid4()),
+                project_id=schedule.project_id,
+                location_id=schedule.location_id,
+                unit_id=unit_id,
+                action_type="stop",
+                device_type=schedule.device_type,
+                scheduled_time=end_utc,
+                execution_status="pending",
+                notes=stop_notes,
+            )
+            actions.append(stop_action)
+
+        return actions
+
+    def _generate_interval_actions(
+        self,
+        schedule: RecurringSchedule,
+        horizon_days: int,
+    ) -> List[ScheduledAction]:
+        """
+        Generate actions from simple interval pattern.
+
+        For daily cycles: stop, download (optional), start at cycle_time each day.
+        """
+        if not schedule.cycle_time:
+            return []
+
+        cycle_time = self._parse_time(schedule.cycle_time)
+        if not cycle_time:
+            return []
+
+        actions = []
+        tz = ZoneInfo(schedule.timezone)
+        now_utc = datetime.utcnow()
+        now_local = now_utc.replace(tzinfo=ZoneInfo("UTC")).astimezone(tz)
+
+        # Get unit_id
+        unit_id = self._resolve_unit_id(schedule)
+
+        for day_offset in range(horizon_days):
+            check_date = now_local.date() + timedelta(days=day_offset)
+
+            # Create cycle datetime in local timezone
+            cycle_local = datetime.combine(check_date, cycle_time, tzinfo=tz)
+            cycle_utc = cycle_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+
+            # Skip if time has passed
+            if cycle_utc <= now_utc:
+                continue
+
+            # Check if cycle action already exists
+            if self._action_exists(schedule.project_id, schedule.location_id, "cycle", cycle_utc):
+                continue
+
+            # Build notes with metadata for cycle action
+            cycle_notes = json.dumps({
+                "schedule_name": schedule.name,
+                "schedule_id": schedule.id,
+                "cycle_type": "daily",
+                "include_download": schedule.include_download,
+                "auto_increment_index": schedule.auto_increment_index,
+            })
+
+            # Create single CYCLE action that handles stop -> download -> start
+            # The scheduler's _execute_cycle method handles the full workflow with delays
+            cycle_action = ScheduledAction(
+                id=str(uuid.uuid4()),
+                project_id=schedule.project_id,
+                location_id=schedule.location_id,
+                unit_id=unit_id,
+                action_type="cycle",
+                device_type=schedule.device_type,
+                scheduled_time=cycle_utc,
+                execution_status="pending",
+                notes=cycle_notes,
+            )
+            actions.append(cycle_action)
+
+        return actions
+
+    def _generate_one_off_actions(
+        self,
+        schedule: RecurringSchedule,
+    ) -> List[ScheduledAction]:
+        """
+        Generate start and stop actions for a one-off recording.
+
+        Unlike recurring types, this generates exactly one start and one stop action
+        using the schedule's start_datetime and end_datetime directly.
+        """
+        if not schedule.start_datetime or not schedule.end_datetime:
+            logger.warning(f"One-off schedule {schedule.id} missing start/end datetime")
+            return []
+
+        actions = []
+        now_utc = datetime.utcnow()
+        unit_id = self._resolve_unit_id(schedule)
+
+        # Skip if end time has already passed
+        if schedule.end_datetime <= now_utc:
+            return []
+
+        # Check if actions already exist for this schedule
+        if self._action_exists(schedule.project_id, schedule.location_id, "start", schedule.start_datetime):
+            return []
+
+        # Create START action (only if start time hasn't passed)
+        if schedule.start_datetime > now_utc:
+            start_notes = json.dumps({
+                "schedule_name": schedule.name,
+                "schedule_id": schedule.id,
+                "schedule_type": "one_off",
+                "auto_increment_index": schedule.auto_increment_index,
+            })
+
+            start_action = ScheduledAction(
+                id=str(uuid.uuid4()),
+                project_id=schedule.project_id,
+                location_id=schedule.location_id,
+                unit_id=unit_id,
+                action_type="start",
+                device_type=schedule.device_type,
+                scheduled_time=schedule.start_datetime,
+                execution_status="pending",
+                notes=start_notes,
+            )
+            actions.append(start_action)
+
+        # Create STOP action
+        stop_notes = json.dumps({
+            "schedule_name": schedule.name,
+            "schedule_id": schedule.id,
+            "schedule_type": "one_off",
+            "include_download": schedule.include_download,
+        })
+
+        stop_action = ScheduledAction(
+            id=str(uuid.uuid4()),
+            project_id=schedule.project_id,
+            location_id=schedule.location_id,
+            unit_id=unit_id,
+            action_type="stop",
+            device_type=schedule.device_type,
+            scheduled_time=schedule.end_datetime,
+            execution_status="pending",
+            notes=stop_notes,
+        )
+        actions.append(stop_action)
+
+        return actions
+
+    def _calculate_next_occurrence(self, schedule: RecurringSchedule) -> Optional[datetime]:
+        """Calculate when the next action should occur."""
+        if not schedule.enabled:
+            return None
+
+        tz = ZoneInfo(schedule.timezone)
+        now_utc = datetime.utcnow()
+        now_local = now_utc.replace(tzinfo=ZoneInfo("UTC")).astimezone(tz)
+
+        if schedule.schedule_type == "weekly_calendar" and schedule.weekly_pattern:
+            try:
+                pattern = json.loads(schedule.weekly_pattern)
+            except:
+                return None
+
+            # Find next enabled day
+            for day_offset in range(8):  # Check up to a week ahead
+                check_date = now_local.date() + timedelta(days=day_offset)
+                day_name = DAY_NAMES[check_date.weekday()]
+                day_config = pattern.get(day_name, {})
+
+                if day_config.get("enabled") and day_config.get("start"):
+                    start_time = self._parse_time(day_config["start"])
+                    if start_time:
+                        start_local = datetime.combine(check_date, start_time, tzinfo=tz)
+                        start_utc = start_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+                        if start_utc > now_utc:
+                            return start_utc
+
+        elif schedule.schedule_type == "simple_interval" and schedule.cycle_time:
+            cycle_time = self._parse_time(schedule.cycle_time)
+            if cycle_time:
+                # Find next cycle time
+                for day_offset in range(2):
+                    check_date = now_local.date() + timedelta(days=day_offset)
+                    cycle_local = datetime.combine(check_date, cycle_time, tzinfo=tz)
+                    cycle_utc = cycle_local.astimezone(ZoneInfo("UTC")).replace(tzinfo=None)
+                    if cycle_utc > now_utc:
+                        return cycle_utc
+
+        elif schedule.schedule_type == "one_off":
+            if schedule.start_datetime and schedule.start_datetime > now_utc:
+                return schedule.start_datetime
+            elif schedule.end_datetime and schedule.end_datetime > now_utc:
+                return schedule.end_datetime
+            return None
+
+        return None
+
+    def _resolve_unit_id(self, schedule: RecurringSchedule) -> Optional[str]:
+        """Get unit_id from schedule or active assignment."""
+        if schedule.unit_id:
+            return schedule.unit_id
+
+        # Try to get from active assignment
+        assignment = self.db.query(UnitAssignment).filter(
+            and_(
+                UnitAssignment.location_id == schedule.location_id,
+                UnitAssignment.status == "active",
+            )
+        ).first()
+
+        return assignment.unit_id if assignment else None
+
+    def _action_exists(
+        self,
+        project_id: str,
+        location_id: str,
+        action_type: str,
+        scheduled_time: datetime,
+    ) -> bool:
+        """Check if an action already exists for this time slot."""
+        # Allow 5-minute window for duplicate detection
+        time_window_start = scheduled_time - timedelta(minutes=5)
+        time_window_end = scheduled_time + timedelta(minutes=5)
+
+        exists = self.db.query(ScheduledAction).filter(
+            and_(
+                ScheduledAction.project_id == project_id,
+                ScheduledAction.location_id == location_id,
+                ScheduledAction.action_type == action_type,
+                ScheduledAction.scheduled_time >= time_window_start,
+                ScheduledAction.scheduled_time <= time_window_end,
+                ScheduledAction.execution_status == "pending",
+            )
+        ).first()
+
+        return exists is not None
+
+    @staticmethod
+    def _parse_time(time_str: str) -> Optional[time]:
+        """Parse time string "HH:MM" to time object."""
+        try:
+            parts = time_str.split(":")
+            return time(int(parts[0]), int(parts[1]))
+        except (ValueError, IndexError):
+            return None
+
+    def get_schedules_for_project(self, project_id: str) -> List[RecurringSchedule]:
+        """Get all recurring schedules for a project."""
+        return self.db.query(RecurringSchedule).filter_by(project_id=project_id).all()
+
+    def get_enabled_schedules(self) -> List[RecurringSchedule]:
+        """Get all enabled recurring schedules for projects that are not on hold or deleted."""
+        active_project_ids = [
+            p.id for p in self.db.query(Project.id).filter(
+                Project.status.notin_(["on_hold", "archived", "deleted"])
+            ).all()
+        ]
+        return self.db.query(RecurringSchedule).filter(
+            RecurringSchedule.enabled == True,
+            RecurringSchedule.project_id.in_(active_project_ids),
+        ).all()
+
+
+def get_recurring_schedule_service(db: Session) -> RecurringScheduleService:
+    """Get a RecurringScheduleService instance."""
+    return RecurringScheduleService(db)

backend/services/scheduler.py

@@ -0,0 +1,842 @@
+"""
+Scheduler Service
+
+Executes scheduled actions for Projects system.
+Monitors pending scheduled actions and executes them by calling device modules (SLMM/SFM).
+
+Extended to support recurring schedules:
+- Generates ScheduledActions from RecurringSchedule patterns
+- Cleans up old completed/failed actions
+
+This service runs as a background task in FastAPI, checking for pending actions
+every minute and executing them when their scheduled time arrives.
+"""
+
+import asyncio
+import json
+import logging
+from datetime import datetime, timedelta
+from typing import Optional, List, Dict, Any
+from sqlalchemy.orm import Session
+from sqlalchemy import and_
+
+from backend.database import SessionLocal
+from backend.models import ScheduledAction, MonitoringSession, MonitoringLocation, Project, RecurringSchedule
+from backend.services.device_controller import get_device_controller, DeviceControllerError
+from backend.services.alert_service import get_alert_service
+import uuid
+
+logger = logging.getLogger(__name__)
+
+
+class SchedulerService:
+    """
+    Service for executing scheduled actions.
+
+    Usage:
+        scheduler = SchedulerService()
+        await scheduler.start()  # Start background loop
+        scheduler.stop()  # Stop background loop
+    """
+
+    def __init__(self, check_interval: int = 60):
+        """
+        Initialize scheduler.
+
+        Args:
+            check_interval: Seconds between checks for pending actions (default: 60)
+        """
+        self.check_interval = check_interval
+        self.running = False
+        self.task: Optional[asyncio.Task] = None
+        self.device_controller = get_device_controller()
+
+    async def start(self):
+        """Start the scheduler background task."""
+        if self.running:
+            print("Scheduler is already running")
+            return
+
+        self.running = True
+        self.task = asyncio.create_task(self._run_loop())
+        print(f"Scheduler started (checking every {self.check_interval}s)")
+
+    def stop(self):
+        """Stop the scheduler background task."""
+        self.running = False
+        if self.task:
+            self.task.cancel()
+        print("Scheduler stopped")
+
+    async def _run_loop(self):
+        """Main scheduler loop."""
+        # Track when we last generated recurring actions (do this once per hour)
+        last_generation_check = datetime.utcnow() - timedelta(hours=1)
+
+        while self.running:
+            try:
+                # Execute pending actions
+                await self.execute_pending_actions()
+
+                # Generate actions from recurring schedules (every hour)
+                now = datetime.utcnow()
+                if (now - last_generation_check).total_seconds() >= 3600:
+                    await self.generate_recurring_actions()
+                    last_generation_check = now
+
+                # Cleanup old actions (also every hour, during generation cycle)
+                if (now - last_generation_check).total_seconds() < 60:
+                    await self.cleanup_old_actions()
+
+            except Exception as e:
+                logger.error(f"Scheduler error: {e}", exc_info=True)
+                # Continue running even if there's an error
+
+            await asyncio.sleep(self.check_interval)
+
+    async def execute_pending_actions(self) -> List[Dict[str, Any]]:
+        """
+        Find and execute all pending scheduled actions that are due.
+
+        Returns:
+            List of execution results
+        """
+        db = SessionLocal()
+        results = []
+
+        try:
+            # Find pending actions that are due
+            now = datetime.utcnow()
+
+            # Only execute actions for active/completed projects (not on_hold, archived, or deleted)
+            active_project_ids = [
+                p.id for p in db.query(Project.id).filter(
+                    Project.status.notin_(["on_hold", "archived", "deleted"])
+                ).all()
+            ]
+
+            pending_actions = db.query(ScheduledAction).filter(
+                and_(
+                    ScheduledAction.execution_status == "pending",
+                    ScheduledAction.scheduled_time <= now,
+                    ScheduledAction.project_id.in_(active_project_ids),
+                )
+            ).order_by(ScheduledAction.scheduled_time).all()
+
+            if not pending_actions:
+                return []
+
+            print(f"Found {len(pending_actions)} pending action(s) to execute")
+
+            for action in pending_actions:
+                result = await self._execute_action(action, db)
+                results.append(result)
+
+            db.commit()
+
+        except Exception as e:
+            print(f"Error executing pending actions: {e}")
+            db.rollback()
+        finally:
+            db.close()
+
+        return results
+
+    async def _execute_action(
+        self,
+        action: ScheduledAction,
+        db: Session,
+    ) -> Dict[str, Any]:
+        """
+        Execute a single scheduled action.
+
+        Args:
+            action: ScheduledAction to execute
+            db: Database session
+
+        Returns:
+            Execution result dict
+        """
+        print(f"Executing action {action.id}: {action.action_type} for unit {action.unit_id}")
+
+        result = {
+            "action_id": action.id,
+            "action_type": action.action_type,
+            "unit_id": action.unit_id,
+            "scheduled_time": action.scheduled_time.isoformat(),
+            "success": False,
+            "error": None,
+        }
+
+        try:
+            # Determine which unit to use
+            # If unit_id is specified, use it; otherwise get from location assignment
+            unit_id = action.unit_id
+            if not unit_id:
+                # Get assigned unit from location
+                from backend.models import UnitAssignment
+                assignment = db.query(UnitAssignment).filter(
+                    and_(
+                        UnitAssignment.location_id == action.location_id,
+                        UnitAssignment.status == "active",
+                    )
+                ).first()
+
+                if not assignment:
+                    raise Exception(f"No active unit assigned to location {action.location_id}")
+
+                unit_id = assignment.unit_id
+
+            # Execute the action based on type
+            if action.action_type == "start":
+                response = await self._execute_start(action, unit_id, db)
+            elif action.action_type == "stop":
+                response = await self._execute_stop(action, unit_id, db)
+            elif action.action_type == "download":
+                response = await self._execute_download(action, unit_id, db)
+            elif action.action_type == "cycle":
+                response = await self._execute_cycle(action, unit_id, db)
+            else:
+                raise Exception(f"Unknown action type: {action.action_type}")
+
+            # Mark action as completed
+            action.execution_status = "completed"
+            action.executed_at = datetime.utcnow()
+            action.module_response = json.dumps(response)
+
+            result["success"] = True
+            result["response"] = response
+
+            print(f"✓ Action {action.id} completed successfully")
+
+            # Create success alert
+            try:
+                alert_service = get_alert_service(db)
+                alert_metadata = response.get("cycle_response", {}) if isinstance(response, dict) else {}
+                alert_service.create_schedule_completed_alert(
+                    schedule_id=action.id,
+                    action_type=action.action_type,
+                    unit_id=unit_id,
+                    project_id=action.project_id,
+                    location_id=action.location_id,
+                    metadata=alert_metadata,
+                )
+            except Exception as alert_err:
+                logger.warning(f"Failed to create success alert: {alert_err}")
+
+        except Exception as e:
+            # Mark action as failed
+            action.execution_status = "failed"
+            action.executed_at = datetime.utcnow()
+            action.error_message = str(e)
+
+            result["error"] = str(e)
+
+            print(f"✗ Action {action.id} failed: {e}")
+
+            # Create failure alert
+            try:
+                alert_service = get_alert_service(db)
+                alert_service.create_schedule_failed_alert(
+                    schedule_id=action.id,
+                    action_type=action.action_type,
+                    unit_id=unit_id if 'unit_id' in dir() else action.unit_id,
+                    error_message=str(e),
+                    project_id=action.project_id,
+                    location_id=action.location_id,
+                )
+            except Exception as alert_err:
+                logger.warning(f"Failed to create failure alert: {alert_err}")
+
+        return result
+
+    async def _execute_start(
+        self,
+        action: ScheduledAction,
+        unit_id: str,
+        db: Session,
+    ) -> Dict[str, Any]:
+        """Execute a 'start' action using the start_cycle command.
+
+        start_cycle handles:
+        1. Sync device clock to server time
+        2. Find next safe index (with overwrite protection)
+        3. Start measurement
+        """
+        # Execute the full start cycle via device controller
+        # SLMM handles clock sync, index increment, and start
+        cycle_response = await self.device_controller.start_cycle(
+            unit_id,
+            action.device_type,
+            sync_clock=True,
+        )
+
+        # Create recording session
+        session = MonitoringSession(
+            id=str(uuid.uuid4()),
+            project_id=action.project_id,
+            location_id=action.location_id,
+            unit_id=unit_id,
+            session_type="sound" if action.device_type == "slm" else "vibration",
+            started_at=datetime.utcnow(),
+            status="recording",
+            session_metadata=json.dumps({
+                "scheduled_action_id": action.id,
+                "cycle_response": cycle_response,
+            }),
+        )
+        db.add(session)
+
+        return {
+            "status": "started",
+            "session_id": session.id,
+            "cycle_response": cycle_response,
+        }
+
+    async def _execute_stop(
+        self,
+        action: ScheduledAction,
+        unit_id: str,
+        db: Session,
+    ) -> Dict[str, Any]:
+        """Execute a 'stop' action using the stop_cycle command.
+
+        stop_cycle handles:
+        1. Stop measurement
+        2. Enable FTP
+        3. Download measurement folder to SLMM local storage
+
+        After stop_cycle, if download succeeded, this method fetches the ZIP
+        from SLMM and extracts it into Terra-View's project directory, creating
+        DataFile records for each file.
+        """
+        import hashlib
+        import io
+        import os
+        import zipfile
+        import httpx
+        from pathlib import Path
+        from backend.models import DataFile
+
+        # Parse notes for download preference
+        include_download = True
+        try:
+            if action.notes:
+                notes_data = json.loads(action.notes)
+                include_download = notes_data.get("include_download", True)
+        except json.JSONDecodeError:
+            pass  # Notes is plain text, not JSON
+
+        # Execute the full stop cycle via device controller
+        # SLMM handles stop, FTP enable, and download to SLMM-local storage
+        cycle_response = await self.device_controller.stop_cycle(
+            unit_id,
+            action.device_type,
+            download=include_download,
+        )
+
+        # Find and update the active recording session
+        active_session = db.query(MonitoringSession).filter(
+            and_(
+                MonitoringSession.location_id == action.location_id,
+                MonitoringSession.unit_id == unit_id,
+                MonitoringSession.status == "recording",
+            )
+        ).first()
+
+        if active_session:
+            active_session.stopped_at = datetime.utcnow()
+            active_session.status = "completed"
+            active_session.duration_seconds = int(
+                (active_session.stopped_at - active_session.started_at).total_seconds()
+            )
+            # Store download info in session metadata
+            if cycle_response.get("download_success"):
+                try:
+                    metadata = json.loads(active_session.session_metadata or "{}")
+                    metadata["downloaded_folder"] = cycle_response.get("downloaded_folder")
+                    metadata["local_path"] = cycle_response.get("local_path")
+                    active_session.session_metadata = json.dumps(metadata)
+                except json.JSONDecodeError:
+                    pass
+
+        db.commit()
+
+        # If SLMM downloaded the folder successfully, fetch the ZIP from SLMM
+        # and extract it into Terra-View's project directory, creating DataFile records
+        files_created = 0
+        if include_download and cycle_response.get("download_success") and active_session:
+            folder_name = cycle_response.get("downloaded_folder")  # e.g. "Auto_0058"
+            remote_path = f"/NL-43/{folder_name}"
+
+            try:
+                SLMM_BASE_URL = os.getenv("SLMM_BASE_URL", "http://localhost:8100")
+                async with httpx.AsyncClient(timeout=600.0) as client:
+                    zip_response = await client.post(
+                        f"{SLMM_BASE_URL}/api/nl43/{unit_id}/ftp/download-folder",
+                        json={"remote_path": remote_path}
+                    )
+
+                if zip_response.is_success and len(zip_response.content) > 22:
+                    base_dir = Path(f"data/Projects/{action.project_id}/{active_session.id}/{folder_name}")
+                    base_dir.mkdir(parents=True, exist_ok=True)
+
+                    file_type_map = {
+                        '.wav': 'audio', '.mp3': 'audio',
+                        '.csv': 'data', '.txt': 'data', '.json': 'data', '.dat': 'data',
+                        '.rnd': 'data', '.rnh': 'data',
+                        '.log': 'log',
+                        '.zip': 'archive',
+                        '.jpg': 'image', '.jpeg': 'image', '.png': 'image',
+                        '.pdf': 'document',
+                    }
+
+                    with zipfile.ZipFile(io.BytesIO(zip_response.content)) as zf:
+                        for zip_info in zf.filelist:
+                            if zip_info.is_dir():
+                                continue
+                            file_data = zf.read(zip_info.filename)
+                            file_path = base_dir / zip_info.filename
+                            file_path.parent.mkdir(parents=True, exist_ok=True)
+                            with open(file_path, 'wb') as f:
+                                f.write(file_data)
+                            checksum = hashlib.sha256(file_data).hexdigest()
+                            ext = os.path.splitext(zip_info.filename)[1].lower()
+                            data_file = DataFile(
+                                id=str(uuid.uuid4()),
+                                session_id=active_session.id,
+                                file_path=str(file_path.relative_to("data")),
+                                file_type=file_type_map.get(ext, 'data'),
+                                file_size_bytes=len(file_data),
+                                downloaded_at=datetime.utcnow(),
+                                checksum=checksum,
+                                file_metadata=json.dumps({
+                                    "source": "stop_cycle",
+                                    "remote_path": remote_path,
+                                    "unit_id": unit_id,
+                                    "folder_name": folder_name,
+                                    "relative_path": zip_info.filename,
+                                }),
+                            )
+                            db.add(data_file)
+                            files_created += 1
+
+                    db.commit()
+                    logger.info(f"Created {files_created} DataFile records for session {active_session.id} from {folder_name}")
+                else:
+                    logger.warning(f"ZIP from SLMM for {folder_name} was empty or failed, skipping DataFile creation")
+
+            except Exception as e:
+                logger.error(f"Failed to extract ZIP and create DataFile records for {folder_name}: {e}")
+                # Don't fail the stop action — the device was stopped successfully
+
+        return {
+            "status": "stopped",
+            "session_id": active_session.id if active_session else None,
+            "cycle_response": cycle_response,
+            "files_created": files_created,
+        }
+
+    async def _execute_download(
+        self,
+        action: ScheduledAction,
+        unit_id: str,
+        db: Session,
+    ) -> Dict[str, Any]:
+        """Execute a 'download' action.
+
+        This handles standalone download actions (not part of stop_cycle).
+        The workflow is:
+        1. Enable FTP on device
+        2. Download current measurement folder
+        3. (Optionally disable FTP - left enabled for now)
+        """
+        # Get project and location info for file path
+        location = db.query(MonitoringLocation).filter_by(id=action.location_id).first()
+        project = db.query(Project).filter_by(id=action.project_id).first()
+
+        if not location or not project:
+            raise Exception("Project or location not found")
+
+        # Build destination path (for logging/metadata reference)
+        # Actual download location is managed by SLMM (data/downloads/{unit_id}/)
+        session_timestamp = datetime.utcnow().strftime("%Y-%m-%d-%H%M")
+        location_type_dir = "sound" if action.device_type == "slm" else "vibration"
+
+        destination_path = (
+            f"data/Projects/{project.id}/{location_type_dir}/"
+            f"{location.name}/session-{session_timestamp}/"
+        )
+
+        # Step 1: Disable FTP first to reset any stale connection state
+        # Then enable FTP on device
+        logger.info(f"Resetting FTP on {unit_id} for download (disable then enable)")
+        try:
+            await self.device_controller.disable_ftp(unit_id, action.device_type)
+        except Exception as e:
+            logger.warning(f"FTP disable failed (may already be off): {e}")
+        await self.device_controller.enable_ftp(unit_id, action.device_type)
+
+        # Step 2: Download current measurement folder
+        # The slmm_client.download_files() now automatically determines the correct
+        # folder based on the device's current index number
+        response = await self.device_controller.download_files(
+            unit_id,
+            action.device_type,
+            destination_path,
+            files=None,  # Download all files in current measurement folder
+        )
+
+        # TODO: Create DataFile records for downloaded files
+
+        return {
+            "status": "downloaded",
+            "destination_path": destination_path,
+            "device_response": response,
+        }
+
+    async def _execute_cycle(
+        self,
+        action: ScheduledAction,
+        unit_id: str,
+        db: Session,
+    ) -> Dict[str, Any]:
+        """Execute a full 'cycle' action: stop -> download -> start.
+
+        This combines stop, download, and start into a single action with
+        appropriate delays between steps to ensure device stability.
+
+        Workflow:
+        0. Pause background polling to prevent command conflicts
+        1. Stop measurement (wait 10s)
+        2. Disable FTP to reset state (wait 10s)
+        3. Enable FTP (wait 10s)
+        4. Download current measurement folder
+        5. Wait 30s for device to settle
+        6. Start new measurement cycle
+        7. Re-enable background polling
+
+        Total time: ~70-90 seconds depending on download size
+        """
+        logger.info(f"[CYCLE] === Starting full cycle for {unit_id} ===")
+
+        result = {
+            "status": "cycle_complete",
+            "steps": {},
+            "old_session_id": None,
+            "new_session_id": None,
+            "polling_paused": False,
+        }
+
+        # Step 0: Pause background polling for this device to prevent command conflicts
+        # NL-43 devices only support one TCP connection at a time
+        logger.info(f"[CYCLE] Step 0: Pausing background polling for {unit_id}")
+        polling_was_enabled = False
+        try:
+            if action.device_type == "slm":
+                # Get current polling state to restore later
+                from backend.services.slmm_client import get_slmm_client
+                slmm = get_slmm_client()
+                try:
+                    polling_config = await slmm.get_device_polling_config(unit_id)
+                    polling_was_enabled = polling_config.get("poll_enabled", False)
+                except Exception:
+                    polling_was_enabled = True  # Assume enabled if can't check
+
+                # Disable polling during cycle
+                await slmm.update_device_polling_config(unit_id, poll_enabled=False)
+                result["polling_paused"] = True
+                logger.info(f"[CYCLE] Background polling paused for {unit_id}")
+        except Exception as e:
+            logger.warning(f"[CYCLE] Failed to pause polling (continuing anyway): {e}")
+
+        try:
+            # Step 1: Stop measurement
+            logger.info(f"[CYCLE] Step 1/7: Stopping measurement on {unit_id}")
+            try:
+                stop_response = await self.device_controller.stop_recording(unit_id, action.device_type)
+                result["steps"]["stop"] = {"success": True, "response": stop_response}
+                logger.info(f"[CYCLE] Measurement stopped, waiting 10s...")
+            except Exception as e:
+                logger.warning(f"[CYCLE] Stop failed (may already be stopped): {e}")
+                result["steps"]["stop"] = {"success": False, "error": str(e)}
+
+            await asyncio.sleep(10)
+
+            # Step 2: Disable FTP to reset any stale state
+            logger.info(f"[CYCLE] Step 2/7: Disabling FTP on {unit_id}")
+            try:
+                await self.device_controller.disable_ftp(unit_id, action.device_type)
+                result["steps"]["ftp_disable"] = {"success": True}
+                logger.info(f"[CYCLE] FTP disabled, waiting 10s...")
+            except Exception as e:
+                logger.warning(f"[CYCLE] FTP disable failed (may already be off): {e}")
+                result["steps"]["ftp_disable"] = {"success": False, "error": str(e)}
+
+            await asyncio.sleep(10)
+
+            # Step 3: Enable FTP
+            logger.info(f"[CYCLE] Step 3/7: Enabling FTP on {unit_id}")
+            try:
+                await self.device_controller.enable_ftp(unit_id, action.device_type)
+                result["steps"]["ftp_enable"] = {"success": True}
+                logger.info(f"[CYCLE] FTP enabled, waiting 10s...")
+            except Exception as e:
+                logger.error(f"[CYCLE] FTP enable failed: {e}")
+                result["steps"]["ftp_enable"] = {"success": False, "error": str(e)}
+                # Continue anyway - download will fail but we can still try to start
+
+            await asyncio.sleep(10)
+
+            # Step 4: Download current measurement folder
+            logger.info(f"[CYCLE] Step 4/7: Downloading measurement data from {unit_id}")
+            location = db.query(MonitoringLocation).filter_by(id=action.location_id).first()
+            project = db.query(Project).filter_by(id=action.project_id).first()
+
+            if location and project:
+                session_timestamp = datetime.utcnow().strftime("%Y-%m-%d-%H%M")
+                location_type_dir = "sound" if action.device_type == "slm" else "vibration"
+                destination_path = (
+                    f"data/Projects/{project.id}/{location_type_dir}/"
+                    f"{location.name}/session-{session_timestamp}/"
+                )
+
+                try:
+                    download_response = await self.device_controller.download_files(
+                        unit_id,
+                        action.device_type,
+                        destination_path,
+                        files=None,
+                    )
+                    result["steps"]["download"] = {"success": True, "response": download_response}
+                    logger.info(f"[CYCLE] Download complete")
+                except Exception as e:
+                    logger.error(f"[CYCLE] Download failed: {e}")
+                    result["steps"]["download"] = {"success": False, "error": str(e)}
+            else:
+                result["steps"]["download"] = {"success": False, "error": "Project or location not found"}
+
+            # Close out the old recording session
+            active_session = db.query(MonitoringSession).filter(
+                and_(
+                    MonitoringSession.location_id == action.location_id,
+                    MonitoringSession.unit_id == unit_id,
+                    MonitoringSession.status == "recording",
+                )
+            ).first()
+
+            if active_session:
+                active_session.stopped_at = datetime.utcnow()
+                active_session.status = "completed"
+                active_session.duration_seconds = int(
+                    (active_session.stopped_at - active_session.started_at).total_seconds()
+                )
+                result["old_session_id"] = active_session.id
+
+            # Step 5: Wait for device to settle before starting new measurement
+            logger.info(f"[CYCLE] Step 5/7: Waiting 30s for device to settle...")
+            await asyncio.sleep(30)
+
+            # Step 6: Start new measurement cycle
+            logger.info(f"[CYCLE] Step 6/7: Starting new measurement on {unit_id}")
+            try:
+                cycle_response = await self.device_controller.start_cycle(
+                    unit_id,
+                    action.device_type,
+                    sync_clock=True,
+                )
+                result["steps"]["start"] = {"success": True, "response": cycle_response}
+
+                # Create new recording session
+                new_session = MonitoringSession(
+                    id=str(uuid.uuid4()),
+                    project_id=action.project_id,
+                    location_id=action.location_id,
+                    unit_id=unit_id,
+                    session_type="sound" if action.device_type == "slm" else "vibration",
+                    started_at=datetime.utcnow(),
+                    status="recording",
+                    session_metadata=json.dumps({
+                        "scheduled_action_id": action.id,
+                        "cycle_response": cycle_response,
+                        "action_type": "cycle",
+                    }),
+                )
+                db.add(new_session)
+                result["new_session_id"] = new_session.id
+
+                logger.info(f"[CYCLE] New measurement started, session {new_session.id}")
+
+            except Exception as e:
+                logger.error(f"[CYCLE] Start failed: {e}")
+                result["steps"]["start"] = {"success": False, "error": str(e)}
+                raise  # Re-raise to mark the action as failed
+
+        finally:
+            # Step 7: Re-enable background polling (always runs, even on failure)
+            if result.get("polling_paused") and polling_was_enabled:
+                logger.info(f"[CYCLE] Step 7/7: Re-enabling background polling for {unit_id}")
+                try:
+                    if action.device_type == "slm":
+                        from backend.services.slmm_client import get_slmm_client
+                        slmm = get_slmm_client()
+                        await slmm.update_device_polling_config(unit_id, poll_enabled=True)
+                        logger.info(f"[CYCLE] Background polling re-enabled for {unit_id}")
+                except Exception as e:
+                    logger.error(f"[CYCLE] Failed to re-enable polling: {e}")
+                    # Don't raise - cycle completed, just log the error
+
+        logger.info(f"[CYCLE] === Cycle complete for {unit_id} ===")
+        return result
+
+    # ========================================================================
+    # Recurring Schedule Generation
+    # ========================================================================
+
+    async def generate_recurring_actions(self) -> int:
+        """
+        Generate ScheduledActions from all enabled recurring schedules.
+
+        Runs once per hour to generate actions for the next 7 days.
+
+        Returns:
+            Total number of actions generated
+        """
+        db = SessionLocal()
+        total_generated = 0
+
+        try:
+            from backend.services.recurring_schedule_service import get_recurring_schedule_service
+
+            service = get_recurring_schedule_service(db)
+            schedules = service.get_enabled_schedules()
+
+            if not schedules:
+                logger.debug("No enabled recurring schedules found")
+                return 0
+
+            logger.info(f"Generating actions for {len(schedules)} recurring schedule(s)")
+
+            for schedule in schedules:
+                try:
+                    # Auto-disable one-off schedules whose end time has passed
+                    if schedule.schedule_type == "one_off" and schedule.end_datetime:
+                        if schedule.end_datetime <= datetime.utcnow():
+                            schedule.enabled = False
+                            schedule.next_occurrence = None
+                            db.commit()
+                            logger.info(f"Auto-disabled completed one-off schedule: {schedule.name}")
+                            continue
+
+                    actions = service.generate_actions_for_schedule(schedule, horizon_days=7)
+                    total_generated += len(actions)
+                except Exception as e:
+                    logger.error(f"Error generating actions for schedule {schedule.id}: {e}")
+
+            if total_generated > 0:
+                logger.info(f"Generated {total_generated} scheduled actions from recurring schedules")
+
+        except Exception as e:
+            logger.error(f"Error in generate_recurring_actions: {e}", exc_info=True)
+        finally:
+            db.close()
+
+        return total_generated
+
+    async def cleanup_old_actions(self, retention_days: int = 30) -> int:
+        """
+        Remove old completed/failed actions to prevent database bloat.
+
+        Args:
+            retention_days: Keep actions newer than this many days
+
+        Returns:
+            Number of actions cleaned up
+        """
+        db = SessionLocal()
+        cleaned = 0
+
+        try:
+            cutoff = datetime.utcnow() - timedelta(days=retention_days)
+
+            old_actions = db.query(ScheduledAction).filter(
+                and_(
+                    ScheduledAction.execution_status.in_(["completed", "failed", "cancelled"]),
+                    ScheduledAction.executed_at < cutoff,
+                )
+            ).all()
+
+            cleaned = len(old_actions)
+            for action in old_actions:
+                db.delete(action)
+
+            if cleaned > 0:
+                db.commit()
+                logger.info(f"Cleaned up {cleaned} old scheduled actions (>{retention_days} days)")
+
+        except Exception as e:
+            logger.error(f"Error cleaning up old actions: {e}")
+            db.rollback()
+        finally:
+            db.close()
+
+        return cleaned
+
+    # ========================================================================
+    # Manual Execution (for testing/debugging)
+    # ========================================================================
+
+    async def execute_action_by_id(self, action_id: str) -> Dict[str, Any]:
+        """
+        Manually execute a specific action by ID.
+
+        Args:
+            action_id: ScheduledAction ID
+
+        Returns:
+            Execution result
+        """
+        db = SessionLocal()
+        try:
+            action = db.query(ScheduledAction).filter_by(id=action_id).first()
+            if not action:
+                return {"success": False, "error": "Action not found"}
+
+            result = await self._execute_action(action, db)
+            db.commit()
+            return result
+
+        except Exception as e:
+            db.rollback()
+            return {"success": False, "error": str(e)}
+        finally:
+            db.close()
+
+
+# Singleton instance
+_scheduler_instance: Optional[SchedulerService] = None
+
+
+def get_scheduler() -> SchedulerService:
+    """
+    Get the scheduler singleton instance.
+
+    Returns:
+        SchedulerService instance
+    """
+    global _scheduler_instance
+    if _scheduler_instance is None:
+        _scheduler_instance = SchedulerService()
+    return _scheduler_instance
+
+
+async def start_scheduler():
+    """Start the global scheduler instance."""
+    scheduler = get_scheduler()
+    await scheduler.start()
+
+
+def stop_scheduler():
+    """Stop the global scheduler instance."""
+    scheduler = get_scheduler()
+    scheduler.stop()

backend/services/slm_status_sync.py

@@ -0,0 +1,129 @@
+"""
+SLM Status Synchronization Service
+
+Syncs SLM device status from SLMM backend to Terra-View's Emitter table.
+This bridges SLMM's polling data with Terra-View's status snapshot system.
+
+SLMM tracks device reachability via background polling. This service
+fetches that data and creates/updates Emitter records so SLMs appear
+correctly in the dashboard status snapshot.
+"""
+
+import logging
+from datetime import datetime, timezone
+from typing import Dict, Any
+
+from backend.database import get_db_session
+from backend.models import Emitter
+from backend.services.slmm_client import get_slmm_client, SLMMClientError
+
+logger = logging.getLogger(__name__)
+
+
+async def sync_slm_status_to_emitters() -> Dict[str, Any]:
+    """
+    Fetch SLM status from SLMM and sync to Terra-View's Emitter table.
+
+    For each device in SLMM's polling status:
+    - If last_success exists, create/update Emitter with that timestamp
+    - If not reachable, update Emitter with last known timestamp (or None)
+
+    Returns:
+        Dict with synced_count, error_count, errors list
+    """
+    client = get_slmm_client()
+    synced = 0
+    errors = []
+
+    try:
+        # Get polling status from SLMM
+        status_response = await client.get_polling_status()
+
+        # Handle nested response structure
+        data = status_response.get("data", status_response)
+        devices = data.get("devices", [])
+
+        if not devices:
+            logger.debug("No SLM devices in SLMM polling status")
+            return {"synced_count": 0, "error_count": 0, "errors": []}
+
+        db = get_db_session()
+        try:
+            for device in devices:
+                unit_id = device.get("unit_id")
+                if not unit_id:
+                    continue
+
+                try:
+                    # Get or create Emitter record
+                    emitter = db.query(Emitter).filter(Emitter.id == unit_id).first()
+
+                    # Determine last_seen from SLMM data
+                    last_success_str = device.get("last_success")
+                    is_reachable = device.get("is_reachable", False)
+
+                    if last_success_str:
+                        # Parse ISO format timestamp
+                        last_seen = datetime.fromisoformat(
+                            last_success_str.replace("Z", "+00:00")
+                        )
+                        # Convert to naive UTC for consistency with existing code
+                        if last_seen.tzinfo:
+                            last_seen = last_seen.astimezone(timezone.utc).replace(tzinfo=None)
+                    elif is_reachable:
+                        # Device is reachable but no last_success yet (first poll or just started)
+                        # Use current time so it shows as OK, not Missing
+                        last_seen = datetime.utcnow()
+                    else:
+                        last_seen = None
+
+                    # Status will be recalculated by snapshot.py based on time thresholds
+                    # Just store a provisional status here
+                    status = "OK" if is_reachable else "Missing"
+
+                    # Store last error message if available
+                    last_error = device.get("last_error") or ""
+
+                    if emitter:
+                        # Update existing record
+                        emitter.last_seen = last_seen
+                        emitter.status = status
+                        emitter.unit_type = "slm"
+                        emitter.last_file = last_error
+                    else:
+                        # Create new record
+                        emitter = Emitter(
+                            id=unit_id,
+                            unit_type="slm",
+                            last_seen=last_seen,
+                            last_file=last_error,
+                            status=status
+                        )
+                        db.add(emitter)
+
+                    synced += 1
+
+                except Exception as e:
+                    errors.append(f"{unit_id}: {str(e)}")
+                    logger.error(f"Error syncing SLM {unit_id}: {e}")
+
+            db.commit()
+
+        finally:
+            db.close()
+
+        if synced > 0:
+            logger.info(f"Synced {synced} SLM device(s) to Emitter table")
+
+    except SLMMClientError as e:
+        logger.warning(f"Could not reach SLMM for status sync: {e}")
+        errors.append(f"SLMM unreachable: {str(e)}")
+    except Exception as e:
+        logger.error(f"Error in SLM status sync: {e}", exc_info=True)
+        errors.append(str(e))
+
+    return {
+        "synced_count": synced,
+        "error_count": len(errors),
+        "errors": errors
+    }

backend/services/slmm_client.py

@@ -0,0 +1,857 @@
+"""
+SLMM API Client Wrapper
+
+Provides a clean interface for Terra-View to interact with the SLMM backend.
+All SLM operations should go through this client instead of direct HTTP calls.
+
+SLMM (Sound Level Meter Manager) is a separate service running on port 8100
+that handles TCP/FTP communication with Rion NL-43/NL-53 devices.
+"""
+
+import httpx
+import os
+from typing import Optional, Dict, Any, List
+from datetime import datetime
+import json
+
+
+# SLMM backend base URLs - use environment variable if set (for Docker)
+SLMM_BASE_URL = os.environ.get("SLMM_BASE_URL", "http://localhost:8100")
+SLMM_API_BASE = f"{SLMM_BASE_URL}/api/nl43"
+
+
+class SLMMClientError(Exception):
+    """Base exception for SLMM client errors."""
+    pass
+
+
+class SLMMConnectionError(SLMMClientError):
+    """Raised when cannot connect to SLMM backend."""
+    pass
+
+
+class SLMMDeviceError(SLMMClientError):
+    """Raised when device operation fails."""
+    pass
+
+
+class SLMMClient:
+    """
+    Client for interacting with SLMM backend.
+
+    Usage:
+        client = SLMMClient()
+        units = await client.get_all_units()
+        status = await client.get_unit_status("nl43-001")
+        await client.start_recording("nl43-001", config={...})
+    """
+
+    def __init__(self, base_url: str = SLMM_BASE_URL, timeout: float = 30.0):
+        self.base_url = base_url
+        self.api_base = f"{base_url}/api/nl43"
+        self.timeout = timeout
+
+    async def _request(
+        self,
+        method: str,
+        endpoint: str,
+        data: Optional[Dict] = None,
+        params: Optional[Dict] = None,
+    ) -> Dict[str, Any]:
+        """
+        Make an HTTP request to SLMM backend.
+
+        Args:
+            method: HTTP method (GET, POST, PUT, DELETE)
+            endpoint: API endpoint (e.g., "/units", "/{unit_id}/status")
+            data: JSON body for POST/PUT requests
+            params: Query parameters
+
+        Returns:
+            Response JSON as dict
+
+        Raises:
+            SLMMConnectionError: Cannot reach SLMM
+            SLMMDeviceError: Device operation failed
+        """
+        url = f"{self.api_base}{endpoint}"
+
+        try:
+            async with httpx.AsyncClient(timeout=self.timeout) as client:
+                response = await client.request(
+                    method=method,
+                    url=url,
+                    json=data,
+                    params=params,
+                )
+                response.raise_for_status()
+
+                # Handle empty responses
+                if not response.content:
+                    return {}
+
+                return response.json()
+
+        except httpx.ConnectError as e:
+            raise SLMMConnectionError(
+                f"Cannot connect to SLMM backend at {self.base_url}. "
+                f"Is SLMM running? Error: {str(e)}"
+            )
+        except httpx.HTTPStatusError as e:
+            error_detail = "Unknown error"
+            try:
+                error_data = e.response.json()
+                error_detail = error_data.get("detail", str(error_data))
+            except:
+                error_detail = e.response.text or str(e)
+
+            raise SLMMDeviceError(
+                f"SLMM operation failed: {error_detail}"
+            )
+        except Exception as e:
+            error_msg = str(e) if str(e) else type(e).__name__
+            raise SLMMClientError(f"Unexpected error: {error_msg}")
+
+    async def _download_request(
+        self,
+        endpoint: str,
+        data: Dict[str, Any],
+        unit_id: str,
+    ) -> Dict[str, Any]:
+        """
+        Make a download request to SLMM that returns binary file content (not JSON).
+
+        Saves the file locally and returns metadata about the download.
+        """
+        url = f"{self.api_base}{endpoint}"
+
+        try:
+            async with httpx.AsyncClient(timeout=httpx.Timeout(300.0)) as client:
+                response = await client.post(url, json=data)
+                response.raise_for_status()
+
+                # Determine filename from Content-Disposition header or generate one
+                content_disp = response.headers.get("content-disposition", "")
+                filename = None
+                if "filename=" in content_disp:
+                    filename = content_disp.split("filename=")[-1].strip('" ')
+
+                if not filename:
+                    remote_path = data.get("remote_path", "download")
+                    base = os.path.basename(remote_path.rstrip("/"))
+                    filename = f"{base}.zip" if not base.endswith(".zip") else base
+
+                # Save to local downloads directory
+                download_dir = os.path.join("data", "downloads", unit_id)
+                os.makedirs(download_dir, exist_ok=True)
+                local_path = os.path.join(download_dir, filename)
+
+                with open(local_path, "wb") as f:
+                    f.write(response.content)
+
+                return {
+                    "success": True,
+                    "local_path": local_path,
+                    "filename": filename,
+                    "size_bytes": len(response.content),
+                }
+
+        except httpx.ConnectError as e:
+            raise SLMMConnectionError(
+                f"Cannot connect to SLMM backend at {self.base_url}. "
+                f"Is SLMM running? Error: {str(e)}"
+            )
+        except httpx.HTTPStatusError as e:
+            error_detail = "Unknown error"
+            try:
+                error_data = e.response.json()
+                error_detail = error_data.get("detail", str(error_data))
+            except Exception:
+                error_detail = e.response.text or str(e)
+            raise SLMMDeviceError(f"SLMM download failed: {error_detail}")
+        except (SLMMConnectionError, SLMMDeviceError):
+            raise
+        except Exception as e:
+            error_msg = str(e) if str(e) else type(e).__name__
+            raise SLMMClientError(f"Download error: {error_msg}")
+
+    # ========================================================================
+    # Unit Management
+    # ========================================================================
+
+    async def get_all_units(self) -> List[Dict[str, Any]]:
+        """
+        Get all configured SLM units from SLMM.
+
+        Returns:
+            List of unit dicts with id, config, and status
+        """
+        # SLMM doesn't have a /units endpoint yet, so we'll need to add this
+        # For now, return empty list or implement when SLMM endpoint is ready
+        try:
+            response = await self._request("GET", "/units")
+            return response.get("units", [])
+        except SLMMClientError:
+            # Endpoint may not exist yet
+            return []
+
+    async def get_unit_config(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get unit configuration from SLMM cache.
+
+        Args:
+            unit_id: Unit identifier (e.g., "nl43-001")
+
+        Returns:
+            Config dict with host, tcp_port, ftp_port, etc.
+        """
+        return await self._request("GET", f"/{unit_id}/config")
+
+    async def update_unit_config(
+        self,
+        unit_id: str,
+        host: Optional[str] = None,
+        tcp_port: Optional[int] = None,
+        ftp_port: Optional[int] = None,
+        ftp_username: Optional[str] = None,
+        ftp_password: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        """
+        Update unit configuration in SLMM cache.
+
+        Args:
+            unit_id: Unit identifier
+            host: Device IP address
+            tcp_port: TCP control port (default: 2255)
+            ftp_port: FTP data port (default: 21)
+            ftp_username: FTP username
+            ftp_password: FTP password
+
+        Returns:
+            Updated config
+        """
+        config = {}
+        if host is not None:
+            config["host"] = host
+        if tcp_port is not None:
+            config["tcp_port"] = tcp_port
+        if ftp_port is not None:
+            config["ftp_port"] = ftp_port
+        if ftp_username is not None:
+            config["ftp_username"] = ftp_username
+        if ftp_password is not None:
+            config["ftp_password"] = ftp_password
+
+        return await self._request("PUT", f"/{unit_id}/config", data=config)
+
+    # ========================================================================
+    # Status & Monitoring
+    # ========================================================================
+
+    async def get_unit_status(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get cached status snapshot from SLMM.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Status dict with measurement_state, lp, leq, battery, etc.
+        """
+        return await self._request("GET", f"/{unit_id}/status")
+
+    async def get_live_data(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Request fresh data from device (DOD command).
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Live data snapshot
+        """
+        return await self._request("GET", f"/{unit_id}/live")
+
+    # ========================================================================
+    # Recording Control
+    # ========================================================================
+
+    async def start_recording(
+        self,
+        unit_id: str,
+        config: Optional[Dict[str, Any]] = None,
+    ) -> Dict[str, Any]:
+        """
+        Start recording on a unit.
+
+        Args:
+            unit_id: Unit identifier
+            config: Optional recording config (interval, settings, etc.)
+
+        Returns:
+            Response from SLMM with success status
+        """
+        return await self._request("POST", f"/{unit_id}/start", data=config or {})
+
+    async def stop_recording(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Stop recording on a unit.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Response from SLMM
+        """
+        return await self._request("POST", f"/{unit_id}/stop")
+
+    async def pause_recording(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Pause recording on a unit.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Response from SLMM
+        """
+        return await self._request("POST", f"/{unit_id}/pause")
+
+    async def resume_recording(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Resume paused recording on a unit.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Response from SLMM
+        """
+        return await self._request("POST", f"/{unit_id}/resume")
+
+    async def reset_data(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Reset measurement data on a unit.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Response from SLMM
+        """
+        return await self._request("POST", f"/{unit_id}/reset")
+
+    # ========================================================================
+    # Store/Index Management
+    # ========================================================================
+
+    async def get_index_number(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get current store/index number from device.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with current index_number (store name)
+        """
+        return await self._request("GET", f"/{unit_id}/index-number")
+
+    async def set_index_number(
+        self,
+        unit_id: str,
+        index_number: int,
+    ) -> Dict[str, Any]:
+        """
+        Set store/index number on device.
+
+        Args:
+            unit_id: Unit identifier
+            index_number: New index number to set
+
+        Returns:
+            Confirmation response
+        """
+        return await self._request(
+            "PUT",
+            f"/{unit_id}/index-number",
+            data={"index_number": index_number},
+        )
+
+    async def check_overwrite_status(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Check if data exists at the current store index.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with:
+            - overwrite_status: "None" (safe) or "Exist" (would overwrite)
+            - will_overwrite: bool
+            - safe_to_store: bool
+        """
+        return await self._request("GET", f"/{unit_id}/overwrite-check")
+
+    async def increment_index(self, unit_id: str, max_attempts: int = 100) -> Dict[str, Any]:
+        """
+        Find and set the next available (unused) store/index number.
+
+        Checks the current index - if it would overwrite existing data,
+        increments until finding an unused index number.
+
+        Args:
+            unit_id: Unit identifier
+            max_attempts: Maximum number of indices to try before giving up
+
+        Returns:
+            Dict with old_index, new_index, and attempts_made
+        """
+        # Get current index
+        current = await self.get_index_number(unit_id)
+        old_index = current.get("index_number", 0)
+
+        # Check if current index is safe
+        overwrite_check = await self.check_overwrite_status(unit_id)
+        if overwrite_check.get("safe_to_store", False):
+            # Current index is safe, no need to increment
+            return {
+                "success": True,
+                "old_index": old_index,
+                "new_index": old_index,
+                "unit_id": unit_id,
+                "already_safe": True,
+                "attempts_made": 0,
+            }
+
+        # Need to find an unused index
+        attempts = 0
+        test_index = old_index + 1
+
+        while attempts < max_attempts:
+            # Set the new index
+            await self.set_index_number(unit_id, test_index)
+
+            # Check if this index is safe
+            overwrite_check = await self.check_overwrite_status(unit_id)
+            attempts += 1
+
+            if overwrite_check.get("safe_to_store", False):
+                return {
+                    "success": True,
+                    "old_index": old_index,
+                    "new_index": test_index,
+                    "unit_id": unit_id,
+                    "already_safe": False,
+                    "attempts_made": attempts,
+                }
+
+            # Try next index (wrap around at 9999)
+            test_index = (test_index + 1) % 10000
+
+            # Avoid infinite loops if we've wrapped around
+            if test_index == old_index:
+                break
+
+        # Could not find a safe index
+        raise SLMMDeviceError(
+            f"Could not find unused store index for {unit_id} after {attempts} attempts. "
+            f"Consider downloading and clearing data from the device."
+        )
+
+    # ========================================================================
+    # Device Settings
+    # ========================================================================
+
+    async def get_frequency_weighting(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get frequency weighting setting (A, C, or Z).
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with current weighting
+        """
+        return await self._request("GET", f"/{unit_id}/frequency-weighting")
+
+    async def set_frequency_weighting(
+        self,
+        unit_id: str,
+        weighting: str,
+    ) -> Dict[str, Any]:
+        """
+        Set frequency weighting (A, C, or Z).
+
+        Args:
+            unit_id: Unit identifier
+            weighting: "A", "C", or "Z"
+
+        Returns:
+            Confirmation response
+        """
+        return await self._request(
+            "PUT",
+            f"/{unit_id}/frequency-weighting",
+            data={"weighting": weighting},
+        )
+
+    async def get_time_weighting(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get time weighting setting (F, S, or I).
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with current time weighting
+        """
+        return await self._request("GET", f"/{unit_id}/time-weighting")
+
+    async def set_time_weighting(
+        self,
+        unit_id: str,
+        weighting: str,
+    ) -> Dict[str, Any]:
+        """
+        Set time weighting (F=Fast, S=Slow, I=Impulse).
+
+        Args:
+            unit_id: Unit identifier
+            weighting: "F", "S", or "I"
+
+        Returns:
+            Confirmation response
+        """
+        return await self._request(
+            "PUT",
+            f"/{unit_id}/time-weighting",
+            data={"weighting": weighting},
+        )
+
+    async def get_all_settings(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get all device settings.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with all settings
+        """
+        return await self._request("GET", f"/{unit_id}/settings")
+
+    # ========================================================================
+    # FTP Control
+    # ========================================================================
+
+    async def enable_ftp(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Enable FTP server on device.
+
+        Must be called before downloading files. FTP and TCP can work in tandem.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with status message
+        """
+        return await self._request("POST", f"/{unit_id}/ftp/enable")
+
+    async def disable_ftp(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Disable FTP server on device.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with status message
+        """
+        return await self._request("POST", f"/{unit_id}/ftp/disable")
+
+    async def get_ftp_status(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get FTP server status on device.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with ftp_enabled status
+        """
+        return await self._request("GET", f"/{unit_id}/ftp/status")
+
+    # ========================================================================
+    # Data Download
+    # ========================================================================
+
+    async def download_file(
+        self,
+        unit_id: str,
+        remote_path: str,
+    ) -> Dict[str, Any]:
+        """
+        Download a single file from unit via FTP.
+
+        Args:
+            unit_id: Unit identifier
+            remote_path: Path on device to download (e.g., "/NL43_DATA/measurement.wav")
+
+        Returns:
+            Dict with local_path, filename, size_bytes
+        """
+        return await self._download_request(
+            f"/{unit_id}/ftp/download",
+            {"remote_path": remote_path},
+            unit_id,
+        )
+
+    async def download_folder(
+        self,
+        unit_id: str,
+        remote_path: str,
+    ) -> Dict[str, Any]:
+        """
+        Download an entire folder from unit via FTP as a ZIP archive.
+
+        Useful for downloading complete measurement sessions (e.g., Auto_0000 folders).
+
+        Args:
+            unit_id: Unit identifier
+            remote_path: Folder path on device to download (e.g., "/NL43_DATA/Auto_0000")
+
+        Returns:
+            Dict with local_path, folder_name, size_bytes
+        """
+        return await self._download_request(
+            f"/{unit_id}/ftp/download-folder",
+            {"remote_path": remote_path},
+            unit_id,
+        )
+
+    async def download_current_measurement(
+        self,
+        unit_id: str,
+    ) -> Dict[str, Any]:
+        """
+        Download the current measurement folder based on device's index number.
+
+        This is the recommended method for scheduled downloads - it automatically
+        determines which folder to download based on the device's current store index.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with local_path, folder_name, file_count, zip_size_bytes, index_number
+        """
+        # Get current index number from device
+        index_info = await self.get_index_number(unit_id)
+        index_number_raw = index_info.get("index_number", 0)
+
+        # Convert to int - device returns string like "0000" or "0001"
+        try:
+            index_number = int(index_number_raw)
+        except (ValueError, TypeError):
+            index_number = 0
+
+        # Format as Auto_XXXX folder name
+        folder_name = f"Auto_{index_number:04d}"
+        remote_path = f"/NL-43/{folder_name}"
+
+        # Download the folder
+        result = await self.download_folder(unit_id, remote_path)
+        result["index_number"] = index_number
+        return result
+
+    async def download_files(
+        self,
+        unit_id: str,
+        destination_path: str,
+        files: Optional[List[str]] = None,
+    ) -> Dict[str, Any]:
+        """
+        Download measurement files from unit via FTP.
+
+        This method automatically determines the current measurement folder and downloads it.
+        The destination_path parameter is logged for reference but actual download location
+        is managed by SLMM (data/downloads/{unit_id}/).
+
+        Args:
+            unit_id: Unit identifier
+            destination_path: Reference path (for logging/metadata, not used by SLMM)
+            files: Ignored - always downloads the current measurement folder
+
+        Returns:
+            Dict with download result including local_path, folder_name, etc.
+        """
+        # Use the new method that automatically determines what to download
+        result = await self.download_current_measurement(unit_id)
+        result["requested_destination"] = destination_path
+        return result
+
+    # ========================================================================
+    # Cycle Commands (for scheduled automation)
+    # ========================================================================
+
+    async def start_cycle(
+        self,
+        unit_id: str,
+        sync_clock: bool = True,
+    ) -> Dict[str, Any]:
+        """
+        Execute complete start cycle on device via SLMM.
+
+        This handles the full pre-recording workflow:
+        1. Sync device clock to server time
+        2. Find next safe index (with overwrite protection)
+        3. Start measurement
+
+        Args:
+            unit_id: Unit identifier
+            sync_clock: Whether to sync device clock to server time
+
+        Returns:
+            Dict with clock_synced, old_index, new_index, started, etc.
+        """
+        return await self._request(
+            "POST",
+            f"/{unit_id}/start-cycle",
+            data={"sync_clock": sync_clock},
+        )
+
+    async def stop_cycle(
+        self,
+        unit_id: str,
+        download: bool = True,
+        download_path: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        """
+        Execute complete stop cycle on device via SLMM.
+
+        This handles the full post-recording workflow:
+        1. Stop measurement
+        2. Enable FTP
+        3. Download measurement folder (if download=True)
+        4. Verify download
+
+        Args:
+            unit_id: Unit identifier
+            download: Whether to download measurement data
+            download_path: Custom path for downloaded ZIP (optional)
+
+        Returns:
+            Dict with stopped, ftp_enabled, download_success, local_path, etc.
+        """
+        data = {"download": download}
+        if download_path:
+            data["download_path"] = download_path
+        return await self._request(
+            "POST",
+            f"/{unit_id}/stop-cycle",
+            data=data,
+        )
+
+    # ========================================================================
+    # Polling Status (for device monitoring/alerts)
+    # ========================================================================
+
+    async def get_polling_status(self) -> Dict[str, Any]:
+        """
+        Get global polling status from SLMM.
+
+        Returns device reachability information for all polled devices.
+        Used by DeviceStatusMonitor to detect offline/online transitions.
+
+        Returns:
+            Dict with devices list containing:
+            - unit_id
+            - is_reachable
+            - consecutive_failures
+            - last_poll_attempt
+            - last_success
+            - last_error
+        """
+        try:
+            async with httpx.AsyncClient(timeout=self.timeout) as client:
+                response = await client.get(f"{self.base_url}/api/nl43/_polling/status")
+                response.raise_for_status()
+                return response.json()
+        except httpx.ConnectError:
+            raise SLMMConnectionError("Cannot connect to SLMM for polling status")
+        except Exception as e:
+            raise SLMMClientError(f"Failed to get polling status: {str(e)}")
+
+    async def get_device_polling_config(self, unit_id: str) -> Dict[str, Any]:
+        """
+        Get polling configuration for a specific device.
+
+        Args:
+            unit_id: Unit identifier
+
+        Returns:
+            Dict with poll_enabled and poll_interval_seconds
+        """
+        return await self._request("GET", f"/{unit_id}/polling/config")
+
+    async def update_device_polling_config(
+        self,
+        unit_id: str,
+        poll_enabled: Optional[bool] = None,
+        poll_interval_seconds: Optional[int] = None,
+    ) -> Dict[str, Any]:
+        """
+        Update polling configuration for a device.
+
+        Args:
+            unit_id: Unit identifier
+            poll_enabled: Enable/disable polling
+            poll_interval_seconds: Polling interval (10-3600)
+
+        Returns:
+            Updated config
+        """
+        config = {}
+        if poll_enabled is not None:
+            config["poll_enabled"] = poll_enabled
+        if poll_interval_seconds is not None:
+            config["poll_interval_seconds"] = poll_interval_seconds
+
+        return await self._request("PUT", f"/{unit_id}/polling/config", data=config)
+
+    # ========================================================================
+    # Health Check
+    # ========================================================================
+
+    async def health_check(self) -> bool:
+        """
+        Check if SLMM backend is reachable.
+
+        Returns:
+            True if SLMM is responding, False otherwise
+        """
+        try:
+            async with httpx.AsyncClient(timeout=5.0) as client:
+                response = await client.get(f"{self.base_url}/health")
+                return response.status_code == 200
+        except:
+            return False
+
+
+# Singleton instance for convenience
+_default_client: Optional[SLMMClient] = None
+
+
+def get_slmm_client() -> SLMMClient:
+    """
+    Get the default SLMM client instance.
+
+    Returns:
+        SLMMClient instance
+    """
+    global _default_client
+    if _default_client is None:
+        _default_client = SLMMClient()
+    return _default_client

backend/services/slmm_sync.py

@@ -0,0 +1,231 @@
+"""
+SLMM Synchronization Service
+
+This service ensures Terra-View roster is the single source of truth for SLM device configuration.
+When SLM devices are added, edited, or deleted in Terra-View, changes are automatically synced to SLMM.
+"""
+
+import logging
+import httpx
+import os
+from typing import Optional
+from sqlalchemy.orm import Session
+
+from backend.models import RosterUnit
+
+logger = logging.getLogger(__name__)
+
+SLMM_BASE_URL = os.getenv("SLMM_BASE_URL", "http://localhost:8100")
+
+
+async def sync_slm_to_slmm(unit: RosterUnit) -> bool:
+    """
+    Sync a single SLM device from Terra-View roster to SLMM.
+
+    Args:
+        unit: RosterUnit with device_type="slm"
+
+    Returns:
+        True if sync successful, False otherwise
+    """
+    if unit.device_type != "slm":
+        logger.warning(f"Attempted to sync non-SLM unit {unit.id} to SLMM")
+        return False
+
+    if not unit.slm_host:
+        logger.warning(f"SLM {unit.id} has no host configured, skipping SLMM sync")
+        return False
+
+    # Disable polling if unit is benched (deployed=False) or retired
+    # Only actively deployed units should be polled
+    should_poll = unit.deployed and not unit.retired
+
+    try:
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            response = await client.put(
+                f"{SLMM_BASE_URL}/api/nl43/{unit.id}/config",
+                json={
+                    "host": unit.slm_host,
+                    "tcp_port": unit.slm_tcp_port or 2255,
+                    "tcp_enabled": True,
+                    "ftp_enabled": True,
+                    "ftp_username": "USER",  # Default NL43 credentials
+                    "ftp_password": "0000",
+                    "poll_enabled": should_poll,  # Disable polling for benched or retired units
+                    "poll_interval_seconds": 3600,  # Default to 1 hour polling
+                }
+            )
+
+            if response.status_code in [200, 201]:
+                logger.info(f"✓ Synced SLM {unit.id} to SLMM at {unit.slm_host}:{unit.slm_tcp_port or 2255}")
+                return True
+            else:
+                logger.error(f"Failed to sync SLM {unit.id} to SLMM: {response.status_code} {response.text}")
+                return False
+
+    except httpx.TimeoutException:
+        logger.error(f"Timeout syncing SLM {unit.id} to SLMM")
+        return False
+    except Exception as e:
+        logger.error(f"Error syncing SLM {unit.id} to SLMM: {e}")
+        return False
+
+
+async def delete_slm_from_slmm(unit_id: str) -> bool:
+    """
+    Delete a device from SLMM database.
+
+    Args:
+        unit_id: The unit ID to delete
+
+    Returns:
+        True if deletion successful or device doesn't exist, False on error
+    """
+    try:
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            response = await client.delete(
+                f"{SLMM_BASE_URL}/api/nl43/{unit_id}/config"
+            )
+
+            if response.status_code == 200:
+                logger.info(f"✓ Deleted SLM {unit_id} from SLMM")
+                return True
+            elif response.status_code == 404:
+                logger.info(f"SLM {unit_id} not found in SLMM (already deleted)")
+                return True
+            else:
+                logger.error(f"Failed to delete SLM {unit_id} from SLMM: {response.status_code} {response.text}")
+                return False
+
+    except httpx.TimeoutException:
+        logger.error(f"Timeout deleting SLM {unit_id} from SLMM")
+        return False
+    except Exception as e:
+        logger.error(f"Error deleting SLM {unit_id} from SLMM: {e}")
+        return False
+
+
+async def sync_all_slms_to_slmm(db: Session) -> dict:
+    """
+    Sync all SLM devices from Terra-View roster to SLMM.
+
+    This ensures SLMM database matches Terra-View roster as the source of truth.
+    Should be called on Terra-View startup and optionally via admin endpoint.
+
+    Args:
+        db: Database session
+
+    Returns:
+        Dictionary with sync results
+    """
+    logger.info("Starting full SLM sync to SLMM...")
+
+    # Get all SLM units from roster
+    slm_units = db.query(RosterUnit).filter_by(device_type="slm").all()
+
+    results = {
+        "total": len(slm_units),
+        "synced": 0,
+        "skipped": 0,
+        "failed": 0
+    }
+
+    for unit in slm_units:
+        # Skip units without host configured
+        if not unit.slm_host:
+            results["skipped"] += 1
+            logger.debug(f"Skipped {unit.unit_type} - no host configured")
+            continue
+
+        # Sync to SLMM
+        success = await sync_slm_to_slmm(unit)
+        if success:
+            results["synced"] += 1
+        else:
+            results["failed"] += 1
+
+    logger.info(
+        f"SLM sync complete: {results['synced']} synced, "
+        f"{results['skipped']} skipped, {results['failed']} failed"
+    )
+
+    return results
+
+
+async def get_slmm_devices() -> Optional[list]:
+    """
+    Get list of all devices currently in SLMM database.
+
+    Returns:
+        List of device unit_ids, or None on error
+    """
+    try:
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            response = await client.get(f"{SLMM_BASE_URL}/api/nl43/_polling/status")
+
+            if response.status_code == 200:
+                data = response.json()
+                return [device["unit_id"] for device in data["data"]["devices"]]
+            else:
+                logger.error(f"Failed to get SLMM devices: {response.status_code}")
+                return None
+
+    except Exception as e:
+        logger.error(f"Error getting SLMM devices: {e}")
+        return None
+
+
+async def cleanup_orphaned_slmm_devices(db: Session) -> dict:
+    """
+    Remove devices from SLMM that are not in Terra-View roster.
+
+    This cleans up orphaned test devices or devices that were manually added to SLMM.
+
+    Args:
+        db: Database session
+
+    Returns:
+        Dictionary with cleanup results
+    """
+    logger.info("Checking for orphaned devices in SLMM...")
+
+    # Get all device IDs from SLMM
+    slmm_devices = await get_slmm_devices()
+    if slmm_devices is None:
+        return {"error": "Failed to get SLMM device list"}
+
+    # Get all SLM unit IDs from Terra-View roster
+    roster_units = db.query(RosterUnit.id).filter_by(device_type="slm").all()
+    roster_unit_ids = {unit.id for unit in roster_units}
+
+    # Find orphaned devices (in SLMM but not in roster)
+    orphaned = [uid for uid in slmm_devices if uid not in roster_unit_ids]
+
+    results = {
+        "total_in_slmm": len(slmm_devices),
+        "total_in_roster": len(roster_unit_ids),
+        "orphaned": len(orphaned),
+        "deleted": 0,
+        "failed": 0,
+        "orphaned_devices": orphaned
+    }
+
+    if not orphaned:
+        logger.info("No orphaned devices found in SLMM")
+        return results
+
+    logger.info(f"Found {len(orphaned)} orphaned devices in SLMM: {orphaned}")
+
+    # Delete orphaned devices
+    for unit_id in orphaned:
+        success = await delete_slm_from_slmm(unit_id)
+        if success:
+            results["deleted"] += 1
+        else:
+            results["failed"] += 1
+
+    logger.info(
+        f"Cleanup complete: {results['deleted']} deleted, {results['failed']} failed"
+    )
+
+    return results

backend/services/snapshot.py

@@ -0,0 +1,253 @@
+from datetime import datetime, timezone
+from sqlalchemy.orm import Session
+
+from backend.database import get_db_session
+from backend.models import Emitter, RosterUnit, IgnoredUnit
+
+
+def ensure_utc(dt):
+    if dt is None:
+        return None
+    if dt.tzinfo is None:
+        return dt.replace(tzinfo=timezone.utc)
+    return dt.astimezone(timezone.utc)
+
+
+def format_age(last_seen):
+    if not last_seen:
+        return "N/A"
+    last_seen = ensure_utc(last_seen)
+    now = datetime.now(timezone.utc)
+    diff = now - last_seen
+    hours = diff.total_seconds() // 3600
+    mins = (diff.total_seconds() % 3600) // 60
+    return f"{int(hours)}h {int(mins)}m"
+
+
+def calculate_status(last_seen, status_ok_threshold=12, status_pending_threshold=24):
+    """
+    Calculate status based on how long ago the unit was last seen.
+
+    Args:
+        last_seen: datetime of last seen (UTC)
+        status_ok_threshold: hours before status becomes Pending (default 12)
+        status_pending_threshold: hours before status becomes Missing (default 24)
+
+    Returns:
+        "OK", "Pending", or "Missing"
+    """
+    if not last_seen:
+        return "Missing"
+
+    last_seen = ensure_utc(last_seen)
+    now = datetime.now(timezone.utc)
+    hours_ago = (now - last_seen).total_seconds() / 3600
+
+    if hours_ago > status_pending_threshold:
+        return "Missing"
+    elif hours_ago > status_ok_threshold:
+        return "Pending"
+    else:
+        return "OK"
+
+
+def emit_status_snapshot():
+    """
+    Merge roster (what we *intend*) with emitter data (what is *actually happening*).
+    Status is recalculated based on current time to ensure accuracy.
+    """
+
+    db = get_db_session()
+    try:
+        # Get user preferences for status thresholds
+        from backend.models import UserPreferences
+        prefs = db.query(UserPreferences).filter_by(id=1).first()
+        status_ok_threshold = prefs.status_ok_threshold_hours if prefs else 12
+        status_pending_threshold = prefs.status_pending_threshold_hours if prefs else 24
+
+        roster = {r.id: r for r in db.query(RosterUnit).all()}
+        emitters = {e.id: e for e in db.query(Emitter).all()}
+        ignored = {i.id for i in db.query(IgnoredUnit).all()}
+
+        units = {}
+
+        # --- Merge roster entries first ---
+        for unit_id, r in roster.items():
+            e = emitters.get(unit_id)
+            if r.retired:
+                # Retired units get separated later
+                status = "Retired"
+                age = "N/A"
+                last_seen = None
+                fname = ""
+            elif r.out_for_calibration:
+                # Out for calibration units get separated later
+                status = "Out for Calibration"
+                age = "N/A"
+                last_seen = None
+                fname = ""
+            elif getattr(r, 'allocated', False) and not r.deployed:
+                # Allocated: staged for an upcoming job, not yet physically deployed
+                status = "Allocated"
+                age = "N/A"
+                last_seen = None
+                fname = ""
+            else:
+                if e:
+                    last_seen = ensure_utc(e.last_seen)
+                    # RECALCULATE status based on current time, not stored value
+                    status = calculate_status(last_seen, status_ok_threshold, status_pending_threshold)
+                    age = format_age(last_seen)
+                    fname = e.last_file
+                else:
+                    # Rostered but no emitter data
+                    status = "Missing"
+                    last_seen = None
+                    age = "N/A"
+                    fname = ""
+
+                units[unit_id] = {
+                    "id": unit_id,
+                    "status": status,
+                    "age": age,
+                    "last": last_seen.isoformat() if last_seen else None,
+                    "fname": fname,
+                "deployed": r.deployed,
+                "note": r.note or "",
+                "retired": r.retired,
+                "out_for_calibration": r.out_for_calibration or False,
+                "allocated": getattr(r, 'allocated', False) or False,
+                "allocated_to_project_id": getattr(r, 'allocated_to_project_id', None) or "",
+                # Device type and type-specific fields
+                "device_type": r.device_type or "seismograph",
+                "last_calibrated": r.last_calibrated.isoformat() if r.last_calibrated else None,
+                "next_calibration_due": r.next_calibration_due.isoformat() if r.next_calibration_due else None,
+                "deployed_with_modem_id": r.deployed_with_modem_id,
+                "deployed_with_unit_id": r.deployed_with_unit_id,
+                "ip_address": r.ip_address,
+                "phone_number": r.phone_number,
+                    "hardware_model": r.hardware_model,
+                    # Location for mapping
+                    "location": r.location or "",
+                    "address": r.address or "",
+                    "coordinates": r.coordinates or "",
+                }
+
+        # --- Add unexpected emitter-only units ---
+        for unit_id, e in emitters.items():
+            if unit_id not in roster:
+                last_seen = ensure_utc(e.last_seen)
+                # RECALCULATE status for unknown units too
+                status = calculate_status(last_seen, status_ok_threshold, status_pending_threshold)
+                units[unit_id] = {
+                    "id": unit_id,
+                    "status": status,
+                    "age": format_age(last_seen),
+                    "last": last_seen.isoformat(),
+                    "fname": e.last_file,
+                    "deployed": False,            # default
+                    "note": "",
+                    "retired": False,
+                    "out_for_calibration": False,
+                    "allocated": False,
+                    "allocated_to_project_id": "",
+                    # Device type and type-specific fields (defaults for unknown units)
+                    "device_type": "seismograph",  # default
+                    "last_calibrated": None,
+                    "next_calibration_due": None,
+                    "deployed_with_modem_id": None,
+                    "deployed_with_unit_id": None,
+                    "ip_address": None,
+                    "phone_number": None,
+                    "hardware_model": None,
+                    # Location fields
+                    "location": "",
+                    "address": "",
+                    "coordinates": "",
+                }
+
+        # --- Derive modem status from paired devices ---
+        # Modems don't have their own check-in system, so we inherit status
+        # from whatever device they're paired with (seismograph or SLM)
+        # Check both directions: modem.deployed_with_unit_id OR device.deployed_with_modem_id
+        for unit_id, unit_data in units.items():
+            if unit_data.get("device_type") == "modem" and not unit_data.get("retired"):
+                paired_unit_id = None
+                roster_unit = roster.get(unit_id)
+
+                # First, check if modem has deployed_with_unit_id set
+                if roster_unit and roster_unit.deployed_with_unit_id:
+                    paired_unit_id = roster_unit.deployed_with_unit_id
+                else:
+                    # Fallback: check if any device has this modem in deployed_with_modem_id
+                    for other_id, other_roster in roster.items():
+                        if other_roster.deployed_with_modem_id == unit_id:
+                            paired_unit_id = other_id
+                            break
+
+                if paired_unit_id:
+                    paired_unit = units.get(paired_unit_id)
+                    if paired_unit:
+                        # Inherit status from paired device
+                        unit_data["status"] = paired_unit.get("status", "Missing")
+                        unit_data["age"] = paired_unit.get("age", "N/A")
+                        unit_data["last"] = paired_unit.get("last")
+                        unit_data["derived_from"] = paired_unit_id
+
+        # Separate buckets for UI
+        active_units = {
+            uid: u for uid, u in units.items()
+            if not u["retired"] and not u["out_for_calibration"] and u["deployed"] and uid not in ignored
+        }
+
+        benched_units = {
+            uid: u for uid, u in units.items()
+            if not u["retired"] and not u["out_for_calibration"] and not u["allocated"] and not u["deployed"] and uid not in ignored
+        }
+
+        allocated_units = {
+            uid: u for uid, u in units.items()
+            if not u["retired"] and not u["out_for_calibration"] and u["allocated"] and not u["deployed"] and uid not in ignored
+        }
+
+        retired_units = {
+            uid: u for uid, u in units.items()
+            if u["retired"]
+        }
+
+        out_for_calibration_units = {
+            uid: u for uid, u in units.items()
+            if u["out_for_calibration"]
+        }
+
+        # Unknown units - emitters that aren't in the roster and aren't ignored
+        unknown_units = {
+            uid: u for uid, u in units.items()
+            if uid not in roster and uid not in ignored
+        }
+
+        return {
+            "timestamp": datetime.utcnow().isoformat(),
+            "units": units,
+            "active": active_units,
+            "benched": benched_units,
+            "allocated": allocated_units,
+            "retired": retired_units,
+            "out_for_calibration": out_for_calibration_units,
+            "unknown": unknown_units,
+            "summary": {
+                "total": len(active_units) + len(benched_units) + len(allocated_units),
+                "active": len(active_units),
+                "benched": len(benched_units),
+                "allocated": len(allocated_units),
+                "retired": len(retired_units),
+                "out_for_calibration": len(out_for_calibration_units),
+                "unknown": len(unknown_units),
+                # Status counts only for deployed units (active_units)
+                "ok": sum(1 for u in active_units.values() if u["status"] == "OK"),
+                "pending": sum(1 for u in active_units.values() if u["status"] == "Pending"),
+                "missing": sum(1 for u in active_units.values() if u["status"] == "Missing"),
+            }
+        }
+    finally:
+        db.close()

backend/static/icons/ICON_GENERATION_INSTRUCTIONS.md

@@ -0,0 +1,78 @@
+# PWA Icon Generation Instructions
+
+The PWA manifest requires 8 icon sizes for full compatibility across devices.
+
+## Required Icon Sizes
+
+- 72x72px
+- 96x96px
+- 128x128px
+- 144x144px
+- 152x152px
+- 192x192px
+- 384x384px
+- 512x512px (maskable)
+
+## Design Guidelines
+
+**Background:** Navy blue (#142a66)
+**Icon/Logo:** Orange (#f48b1c)
+**Style:** Simple, recognizable design that works at small sizes
+
+## Quick Generation Methods
+
+### Option 1: Online PWA Icon Generator
+
+1. Visit: https://www.pwabuilder.com/imageGenerator
+2. Upload a 512x512px source image
+3. Download the generated icon pack
+4. Copy PNG files to this directory
+
+### Option 2: ImageMagick (Command Line)
+
+If you have a 512x512px source image called `source-icon.png`:
+
+```bash
+# From the icons directory
+for size in 72 96 128 144 152 192 384 512; do
+  convert source-icon.png -resize ${size}x${size} icon-${size}.png
+done
+```
+
+### Option 3: Photoshop/GIMP
+
+1. Create a 512x512px canvas
+2. Add your design (navy background + orange icon)
+3. Save/Export for each required size
+4. Name files as: icon-72.png, icon-96.png, etc.
+
+## Temporary Placeholder
+
+For testing, you can use a simple colored square:
+
+```bash
+# Generate simple colored placeholder icons
+for size in 72 96 128 144 152 192 384 512; do
+  convert -size ${size}x${size} xc:#142a66 \
+    -gravity center \
+    -fill '#f48b1c' \
+    -pointsize $((size / 2)) \
+    -annotate +0+0 'SFM' \
+    icon-${size}.png
+done
+```
+
+## Verification
+
+After generating icons, verify:
+- All 8 sizes exist in this directory
+- Files are named exactly: icon-72.png, icon-96.png, etc.
+- Images have transparent or navy background
+- Logo/text is clearly visible at smallest size (72px)
+
+## Testing PWA Installation
+
+1. Open SFM in Chrome on Android or Safari on iOS
+2. Look for "Install App" or "Add to Home Screen" prompt
+3. Check that the correct icon appears in the install dialog
+4. After installation, verify icon on home screen

backend/static/icons/icon-128.png.svg

@@ -0,0 +1,4 @@
+<svg width="128" height="128" xmlns="http://www.w3.org/2000/svg">
+  <rect width="128" height="128" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="128" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/icons/icon-144.png.svg

@@ -0,0 +1,4 @@
+<svg width="144" height="144" xmlns="http://www.w3.org/2000/svg">
+  <rect width="144" height="144" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="14" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/icons/icon-152.png.svg

@@ -0,0 +1,4 @@
+<svg width="152" height="152" xmlns="http://www.w3.org/2000/svg">
+  <rect width="152" height="152" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="152" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/icons/icon-192.png.svg

@@ -0,0 +1,4 @@
+<svg width="192" height="192" xmlns="http://www.w3.org/2000/svg">
+  <rect width="192" height="192" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="192" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/icons/icon-384.png.svg

@@ -0,0 +1,4 @@
+<svg width="384" height="384" xmlns="http://www.w3.org/2000/svg">
+  <rect width="384" height="384" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="38" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/icons/icon-512.png.svg

@@ -0,0 +1,4 @@
+<svg width="512" height="512" xmlns="http://www.w3.org/2000/svg">
+  <rect width="512" height="512" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="512" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/icons/icon-72.png.svg

@@ -0,0 +1,4 @@
+<svg width="72" height="72" xmlns="http://www.w3.org/2000/svg">
+  <rect width="72" height="72" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="72" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/icons/icon-96.png.svg

@@ -0,0 +1,4 @@
+<svg width="96" height="96" xmlns="http://www.w3.org/2000/svg">
+  <rect width="96" height="96" fill="#142a66"/>
+  <text x="50%" y="50%" font-family="Arial, sans-serif" font-size="96" font-weight="bold" fill="#f48b1c" text-anchor="middle" dominant-baseline="middle">SFM</text>
+</svg>

backend/static/manifest.json

@@ -0,0 +1,78 @@
+{
+  "name": "Seismo Fleet Manager",
+  "short_name": "SFM",
+  "description": "Real-time seismograph and modem fleet monitoring and management",
+  "start_url": "/",
+  "display": "standalone",
+  "orientation": "portrait",
+  "background_color": "#142a66",
+  "theme_color": "#f48b1c",
+  "icons": [
+    {
+      "src": "/static/icons/icon-72.png",
+      "sizes": "72x72",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/icons/icon-96.png",
+      "sizes": "96x96",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/icons/icon-128.png",
+      "sizes": "128x128",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/icons/icon-144.png",
+      "sizes": "144x144",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/icons/icon-152.png",
+      "sizes": "152x152",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/icons/icon-384.png",
+      "sizes": "384x384",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ],
+  "screenshots": [
+    {
+      "src": "/static/screenshots/dashboard.png",
+      "type": "image/png",
+      "sizes": "540x720",
+      "form_factor": "narrow"
+    }
+  ],
+  "categories": ["utilities", "productivity"],
+  "shortcuts": [
+    {
+      "name": "Dashboard",
+      "short_name": "Dashboard",
+      "description": "View fleet status dashboard",
+      "url": "/",
+      "icons": [{ "src": "/static/icons/icon-192.png", "sizes": "192x192" }]
+    },
+    {
+      "name": "Fleet Roster",
+      "short_name": "Roster",
+      "description": "View and manage fleet roster",
+      "url": "/roster",
+      "icons": [{ "src": "/static/icons/icon-192.png", "sizes": "192x192" }]
+    }
+  ]
+}

backend/static/mobile.css

@@ -0,0 +1,612 @@
+/* Mobile-specific styles for Seismo Fleet Manager */
+/* Touch-optimized, portrait-first design */
+
+/* ===== MOBILE TOUCH TARGETS ===== */
+@media (max-width: 767px) {
+  /* Buttons - 44x44px minimum (iOS standard) */
+  .btn, button:not(.tab-button), .button, a.button {
+    min-width: 44px;
+    min-height: 44px;
+    padding: 12px 16px;
+  }
+
+  /* Icon-only buttons */
+  .icon-button, .btn-icon {
+    width: 44px;
+    height: 44px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 0;
+  }
+
+  /* Form inputs - 48px height, 16px font prevents iOS zoom */
+  input:not([type="checkbox"]):not([type="radio"]),
+  select,
+  textarea {
+    min-height: 48px;
+    font-size: 16px !important;
+    padding: 12px 16px;
+  }
+
+  /* Checkboxes and radio buttons - larger touch targets */
+  input[type="checkbox"],
+  input[type="radio"] {
+    width: 24px;
+    height: 24px;
+    min-height: 24px;
+  }
+
+  /* Bottom nav buttons - 56px industry standard */
+  .bottom-nav button {
+    min-height: 56px;
+    padding: 8px;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 4px;
+  }
+
+  /* Increase spacing between clickable elements */
+  .btn + .btn,
+  button + button {
+    margin-left: 8px;
+  }
+}
+
+/* ===== HAMBURGER MENU ===== */
+.hamburger-btn {
+  position: fixed;
+  top: 1rem;
+  left: 1rem;
+  z-index: 50;
+  width: 44px;
+  height: 44px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background-color: white;
+  border: 1px solid #e5e7eb;
+  border-radius: 0.5rem;
+  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
+  transition: all 0.2s;
+}
+
+.hamburger-btn:active {
+  transform: scale(0.95);
+}
+
+.dark .hamburger-btn {
+  background-color: #1e293b;
+  border-color: #374151;
+}
+
+/* Hamburger icon */
+.hamburger-icon {
+  width: 24px;
+  height: 24px;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-around;
+}
+
+.hamburger-line {
+  width: 100%;
+  height: 2px;
+  background-color: #374151;
+  transition: all 0.3s;
+}
+
+.dark .hamburger-line {
+  background-color: #e5e7eb;
+}
+
+/* Hamburger animation when menu open */
+.menu-open .hamburger-line:nth-child(1) {
+  transform: translateY(8px) rotate(45deg);
+}
+
+.menu-open .hamburger-line:nth-child(2) {
+  opacity: 0;
+}
+
+.menu-open .hamburger-line:nth-child(3) {
+  transform: translateY(-8px) rotate(-45deg);
+}
+
+/* ===== SIDEBAR (RESPONSIVE) ===== */
+.sidebar {
+  position: fixed;
+  left: 0;
+  top: 0;
+  width: 16rem; /* 256px */
+  height: 100vh;
+  z-index: 40;
+  transition: transform 0.3s ease-in-out;
+}
+
+@media (max-width: 767px) {
+  .sidebar {
+    transform: translateX(-100%);
+  }
+
+  .sidebar.open {
+    transform: translateX(0);
+  }
+}
+
+@media (min-width: 768px) {
+  .sidebar {
+    transform: translateX(0) !important;
+  }
+}
+
+/* ===== BACKDROP ===== */
+.backdrop {
+  position: fixed;
+  inset: 0;
+  background-color: rgba(0, 0, 0, 0.5);
+  z-index: 30;
+  opacity: 0;
+  transition: opacity 0.3s ease-in-out;
+  pointer-events: none;
+}
+
+.backdrop.show {
+  opacity: 1;
+  pointer-events: auto;
+}
+
+@media (min-width: 768px) {
+  .backdrop {
+    display: none;
+  }
+}
+
+/* ===== BOTTOM NAVIGATION ===== */
+.bottom-nav {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  height: 4rem;
+  background-color: white;
+  border-top: 1px solid #e5e7eb;
+  z-index: 20;
+  box-shadow: 0 -1px 3px 0 rgb(0 0 0 / 0.1);
+}
+
+.dark .bottom-nav {
+  background-color: #1e293b;
+  border-top-color: #374151;
+}
+
+.bottom-nav-btn {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+  color: #6b7280;
+  transition: all 0.2s;
+  border: none;
+  background: none;
+  cursor: pointer;
+  width: 100%;
+  height: 100%;
+}
+
+.bottom-nav-btn:active {
+  transform: scale(0.95);
+  background-color: #f3f4f6;
+}
+
+.dark .bottom-nav-btn:active {
+  background-color: #374151;
+}
+
+.bottom-nav-btn.active {
+  color: #f48b1c; /* seismo-orange */
+}
+
+.bottom-nav-btn svg {
+  width: 24px;
+  height: 24px;
+}
+
+.bottom-nav-btn span {
+  font-size: 11px;
+  font-weight: 500;
+}
+
+@media (min-width: 768px) {
+  .bottom-nav {
+    display: none;
+  }
+}
+
+/* ===== MAIN CONTENT ADJUSTMENTS ===== */
+.main-content {
+  margin-left: 0;
+  padding-bottom: 5rem; /* 80px for bottom nav */
+  min-height: 100vh;
+}
+
+@media (min-width: 768px) {
+  .main-content {
+    margin-left: 16rem; /* 256px sidebar width */
+    padding-bottom: 0;
+  }
+}
+
+/* ===== MOBILE ROSTER CARDS ===== */
+.unit-card {
+  background-color: white;
+  border-radius: 0.5rem;
+  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
+  padding: 1rem;
+  cursor: pointer;
+  transition: transform 0.2s, box-shadow 0.2s;
+  -webkit-tap-highlight-color: transparent;
+}
+
+.unit-card:active {
+  transform: scale(0.98);
+}
+
+.dark .unit-card {
+  background-color: #1e293b;
+}
+
+.unit-card:hover {
+  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
+}
+
+/* ===== UNIT DETAIL MODAL (BOTTOM SHEET) ===== */
+.unit-modal {
+  position: fixed;
+  inset: 0;
+  z-index: 50;
+  display: flex;
+  align-items: flex-end;
+  justify-content: center;
+  pointer-events: none;
+  opacity: 0;
+  transition: opacity 0.3s ease-in-out;
+}
+
+.unit-modal.show {
+  pointer-events: auto;
+  opacity: 1;
+}
+
+.unit-modal-backdrop {
+  position: absolute;
+  inset: 0;
+  background-color: rgba(0, 0, 0, 0.5);
+}
+
+.unit-modal-content {
+  position: relative;
+  width: 100%;
+  max-height: 85vh;
+  background-color: white;
+  border-top-left-radius: 1rem;
+  border-top-right-radius: 1rem;
+  box-shadow: 0 -4px 6px -1px rgb(0 0 0 / 0.1);
+  overflow-y: auto;
+  transform: translateY(100%);
+  transition: transform 0.3s ease-out;
+}
+
+.unit-modal.show .unit-modal-content {
+  transform: translateY(0);
+}
+
+.dark .unit-modal-content {
+  background-color: #1e293b;
+}
+
+@media (min-width: 768px) {
+  .unit-modal {
+    align-items: center;
+  }
+
+  .unit-modal-content {
+    max-width: 42rem; /* 672px */
+    border-radius: 0.75rem;
+    transform: translateY(20px);
+    opacity: 0;
+  }
+
+  .unit-modal.show .unit-modal-content {
+    transform: translateY(0);
+    opacity: 1;
+  }
+}
+
+/* Modal handle bar (mobile only) */
+.modal-handle {
+  height: 4px;
+  width: 3rem;
+  background-color: #d1d5db;
+  border-radius: 9999px;
+  margin: 0.75rem auto 1rem;
+}
+
+@media (min-width: 768px) {
+  .modal-handle {
+    display: none;
+  }
+}
+
+/* ===== OFFLINE INDICATOR ===== */
+.offline-indicator {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  background-color: #eab308; /* yellow-500 */
+  color: white;
+  text-align: center;
+  padding: 0.5rem;
+  font-size: 0.875rem;
+  font-weight: 500;
+  z-index: 50;
+  transform: translateY(-100%);
+  transition: transform 0.3s ease-in-out;
+}
+
+.offline-indicator.show {
+  transform: translateY(0);
+}
+
+/* ===== SYNC TOAST ===== */
+.sync-toast {
+  position: fixed;
+  bottom: 6rem; /* Above bottom nav */
+  left: 1rem;
+  right: 1rem;
+  background-color: #22c55e; /* green-500 */
+  color: white;
+  padding: 0.75rem 1rem;
+  border-radius: 0.5rem;
+  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
+  z-index: 50;
+  opacity: 0;
+  transform: translateY(20px);
+  transition: opacity 0.3s, transform 0.3s;
+  pointer-events: none;
+}
+
+.sync-toast.show {
+  opacity: 1;
+  transform: translateY(0);
+  pointer-events: auto;
+}
+
+@media (min-width: 768px) {
+  .sync-toast {
+    bottom: 1rem;
+    left: auto;
+    right: 1rem;
+    max-width: 20rem;
+  }
+}
+
+/* ===== MOBILE SEARCH BAR (STICKY) ===== */
+@media (max-width: 767px) {
+  .mobile-search-sticky {
+    position: sticky;
+    top: 0;
+    z-index: 10;
+    background-color: #f3f4f6;
+    margin: -1rem -1rem 1rem -1rem;
+    padding: 0.5rem 1rem;
+  }
+
+  .dark .mobile-search-sticky {
+    background-color: #111827;
+  }
+}
+
+@media (min-width: 768px) {
+  .mobile-search-sticky {
+    position: static;
+    background-color: transparent;
+    margin: 0;
+    padding: 0;
+  }
+}
+
+/* ===== STATUS BADGES ===== */
+.status-dot {
+  width: 1rem;
+  height: 1rem;
+  border-radius: 9999px;
+  flex-shrink: 0;
+}
+
+.status-badge {
+  padding: 0.25rem 0.75rem;
+  border-radius: 9999px;
+  font-size: 0.75rem;
+  font-weight: 500;
+}
+
+/* ===== DEVICE TYPE BADGES ===== */
+.device-badge {
+  padding: 0.25rem 0.5rem;
+  border-radius: 9999px;
+  font-size: 0.75rem;
+  font-weight: 500;
+  display: inline-block;
+}
+
+/* ===== MOBILE MAP HEIGHT ===== */
+@media (max-width: 767px) {
+  #fleet-map {
+    height: 16rem !important; /* 256px on mobile */
+  }
+
+  #unit-map {
+    height: 16rem !important; /* 256px on mobile */
+  }
+}
+
+/* ===== MAP OVERLAP FIX ===== */
+/* Prevent map and controls from overlapping UI elements on mobile */
+@media (max-width: 767px) {
+  /* Constrain leaflet container to prevent overflow */
+  .leaflet-container {
+    max-width: 100%;
+    overflow: hidden;
+  }
+
+  /* Override Leaflet's default high z-index values */
+  /* Bottom nav is z-20, sidebar is z-40, so map must be below */
+  .leaflet-pane,
+  .leaflet-tile-pane,
+  .leaflet-overlay-pane,
+  .leaflet-shadow-pane,
+  .leaflet-marker-pane,
+  .leaflet-tooltip-pane,
+  .leaflet-popup-pane {
+    z-index: 1 !important;
+  }
+
+  /* Map controls should also be below navigation elements */
+  .leaflet-control-container,
+  .leaflet-top,
+  .leaflet-bottom,
+  .leaflet-left,
+  .leaflet-right {
+    z-index: 1 !important;
+  }
+
+  .leaflet-control {
+    z-index: 1 !important;
+  }
+
+  /* When sidebar is open, hide all Leaflet controls (zoom, attribution, etc) */
+  body.menu-open .leaflet-control-container {
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.3s ease-in-out;
+  }
+
+  /* Ensure map tiles are non-interactive when sidebar is open */
+  body.menu-open #fleet-map,
+  body.menu-open #unit-map {
+    pointer-events: none;
+  }
+}
+
+/* ===== PENDING SYNC BADGE ===== */
+.pending-sync-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0.125rem 0.5rem;
+  background-color: #fef3c7; /* amber-100 */
+  color: #92400e; /* amber-800 */
+  border-radius: 9999px;
+  font-size: 0.75rem;
+  font-weight: 500;
+}
+
+.dark .pending-sync-badge {
+  background-color: #78350f;
+  color: #fef3c7;
+}
+
+.pending-sync-badge::before {
+  content: "⏳";
+  font-size: 0.875rem;
+}
+
+/* ===== MOBILE-SPECIFIC UTILITY CLASSES ===== */
+@media (max-width: 767px) {
+  .mobile-text-lg {
+    font-size: 1.125rem;
+    line-height: 1.75rem;
+  }
+
+  .mobile-text-xl {
+    font-size: 1.25rem;
+    line-height: 1.75rem;
+  }
+
+  .mobile-p-4 {
+    padding: 1rem;
+  }
+
+  .mobile-mb-4 {
+    margin-bottom: 1rem;
+  }
+}
+
+/* ===== ACCESSIBILITY ===== */
+/* Improve focus visibility on mobile */
+@media (max-width: 767px) {
+  button:focus-visible,
+  a:focus-visible,
+  input:focus-visible,
+  select:focus-visible,
+  textarea:focus-visible {
+    outline: 2px solid #f48b1c;
+    outline-offset: 2px;
+  }
+}
+
+/* Prevent text selection on buttons (better mobile UX) */
+button,
+.btn,
+.button {
+  -webkit-user-select: none;
+  user-select: none;
+  -webkit-tap-highlight-color: transparent;
+}
+
+/* ===== SMOOTH SCROLLING ===== */
+html {
+  scroll-behavior: smooth;
+}
+
+/* Prevent overscroll bounce on iOS */
+body {
+  overscroll-behavior-y: none;
+}
+
+/* ===== LOADING STATES ===== */
+.loading-pulse {
+  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
+}
+
+@keyframes pulse {
+  0%, 100% {
+    opacity: 1;
+  }
+  50% {
+    opacity: 0.5;
+  }
+}
+
+/* ===== SAFE AREA SUPPORT (iOS notch) ===== */
+@supports (padding: env(safe-area-inset-bottom)) {
+  .bottom-nav {
+    padding-bottom: env(safe-area-inset-bottom);
+    height: calc(4rem + env(safe-area-inset-bottom));
+  }
+
+  .main-content {
+    padding-bottom: calc(5rem + env(safe-area-inset-bottom));
+  }
+
+  @media (min-width: 768px) {
+    .main-content {
+      padding-bottom: 0;
+    }
+  }
+}

backend/static/mobile.js

@@ -0,0 +1,597 @@
+/* Mobile JavaScript for Seismo Fleet Manager */
+/* Handles hamburger menu, modals, offline sync, and mobile interactions */
+
+// ===== GLOBAL STATE =====
+let currentUnitData = null;
+let isOnline = navigator.onLine;
+
+// ===== HAMBURGER MENU TOGGLE =====
+function toggleMenu() {
+  const sidebar = document.getElementById('sidebar');
+  const backdrop = document.getElementById('backdrop');
+  const hamburgerBtn = document.getElementById('hamburgerBtn');
+
+  if (sidebar && backdrop) {
+    const isOpen = sidebar.classList.contains('open');
+
+    if (isOpen) {
+      // Close menu
+      sidebar.classList.remove('open');
+      backdrop.classList.remove('show');
+      hamburgerBtn?.classList.remove('menu-open');
+      document.body.style.overflow = '';
+      document.body.classList.remove('menu-open');
+    } else {
+      // Open menu
+      sidebar.classList.add('open');
+      backdrop.classList.add('show');
+      hamburgerBtn?.classList.add('menu-open');
+      document.body.style.overflow = 'hidden';
+      document.body.classList.add('menu-open');
+    }
+  }
+}
+
+// Close menu when clicking backdrop
+function closeMenuFromBackdrop() {
+  const sidebar = document.getElementById('sidebar');
+  const backdrop = document.getElementById('backdrop');
+  const hamburgerBtn = document.getElementById('hamburgerBtn');
+
+  if (sidebar && backdrop) {
+    sidebar.classList.remove('open');
+    backdrop.classList.remove('show');
+    hamburgerBtn?.classList.remove('menu-open');
+    document.body.style.overflow = '';
+    document.body.classList.remove('menu-open');
+  }
+}
+
+// Close menu when window is resized to desktop
+function handleResize() {
+  if (window.innerWidth >= 768) {
+    const sidebar = document.getElementById('sidebar');
+    const backdrop = document.getElementById('backdrop');
+    const hamburgerBtn = document.getElementById('hamburgerBtn');
+
+    if (sidebar && backdrop) {
+      sidebar.classList.remove('open');
+      backdrop.classList.remove('show');
+      hamburgerBtn?.classList.remove('menu-open');
+      document.body.style.overflow = '';
+      document.body.classList.remove('menu-open');
+    }
+  }
+}
+
+// ===== UNIT DETAIL MODAL =====
+function openUnitModal(unitId, status = null, age = null) {
+  const modal = document.getElementById('unitModal');
+  if (!modal) return;
+
+  // Store the status info passed from the card
+  // Accept status if it's a non-empty string, use age if provided or default to '--'
+  const cardStatusInfo = (status && status !== '') ? {
+    status: status,
+    age: age || '--'
+  } : null;
+
+  console.log('openUnitModal:', { unitId, status, age, cardStatusInfo });
+
+  // Fetch unit data and populate modal
+  fetchUnitDetails(unitId).then(unit => {
+    if (unit) {
+      currentUnitData = unit;
+      // Pass the card status info to the populate function
+      populateUnitModal(unit, cardStatusInfo);
+      modal.classList.add('show');
+      document.body.style.overflow = 'hidden';
+    }
+  });
+}
+
+function closeUnitModal(event) {
+  // Only close if clicking backdrop or close button
+  if (event && event.target.closest('.unit-modal-content') && !event.target.closest('[data-close-modal]')) {
+    return;
+  }
+
+  const modal = document.getElementById('unitModal');
+  if (modal) {
+    modal.classList.remove('show');
+    document.body.style.overflow = '';
+    currentUnitData = null;
+  }
+}
+
+async function fetchUnitDetails(unitId) {
+  try {
+    // Try to fetch from network first
+    const response = await fetch(`/api/roster/${unitId}`);
+    if (response.ok) {
+      const unit = await response.json();
+
+      // Save to IndexedDB if offline support is available
+      if (window.offlineDB) {
+        await window.offlineDB.saveUnit(unit);
+      }
+
+      return unit;
+    }
+  } catch (error) {
+    console.log('Network fetch failed, trying offline storage:', error);
+
+    // Fall back to offline storage
+    if (window.offlineDB) {
+      return await window.offlineDB.getUnit(unitId);
+    }
+  }
+
+  return null;
+}
+
+function populateUnitModal(unit, cardStatusInfo = null) {
+  // Set unit ID in header
+  const modalUnitId = document.getElementById('modalUnitId');
+  if (modalUnitId) {
+    modalUnitId.textContent = unit.id;
+  }
+
+  // Populate modal content
+  const modalContent = document.getElementById('modalContent');
+  if (!modalContent) return;
+
+  // Use status from card if provided, otherwise get from snapshot or derive from unit
+  let statusInfo = cardStatusInfo || getUnitStatus(unit.id, unit);
+  console.log('populateUnitModal:', { unit, cardStatusInfo, statusInfo });
+
+  const statusColor = statusInfo.status === 'OK' ? 'green' :
+                      statusInfo.status === 'Pending' ? 'yellow' :
+                      statusInfo.status === 'Missing' ? 'red' : 'gray';
+
+  const statusTextColor = statusInfo.status === 'OK' ? 'text-green-600 dark:text-green-400' :
+                          statusInfo.status === 'Pending' ? 'text-yellow-600 dark:text-yellow-400' :
+                          statusInfo.status === 'Missing' ? 'text-red-600 dark:text-red-400' :
+                          'text-gray-600 dark:text-gray-400';
+
+  // Determine status label (show "Benched" instead of "Unknown" for non-deployed units)
+  let statusLabel = statusInfo.status;
+  if ((statusInfo.status === 'Unknown' || statusInfo.status === 'N/A') && !unit.deployed) {
+    statusLabel = 'Benched';
+  }
+
+  // Create navigation URL for location
+  const createNavUrl = (address, coordinates) => {
+    if (address) {
+      // Use address for navigation
+      const encodedAddress = encodeURIComponent(address);
+      // Universal link that works on iOS and Android
+      return `https://www.google.com/maps/search/?api=1&query=${encodedAddress}`;
+    } else if (coordinates) {
+      // Use coordinates for navigation (format: lat,lon)
+      const encodedCoords = encodeURIComponent(coordinates);
+      return `https://www.google.com/maps/search/?api=1&query=${encodedCoords}`;
+    }
+    return null;
+  };
+
+  const navUrl = createNavUrl(unit.address, unit.coordinates);
+
+  modalContent.innerHTML = `
+    <!-- Status Section -->
+    <div class="flex items-center justify-between pb-4 border-b border-gray-200 dark:border-gray-700">
+      <div class="flex items-center gap-2">
+        <span class="w-4 h-4 rounded-full bg-${statusColor}-500"></span>
+        <span class="font-semibold ${statusTextColor}">${statusLabel}</span>
+      </div>
+      <span class="text-sm text-gray-500">${statusInfo.age || '--'}</span>
+    </div>
+
+    <!-- Device Info -->
+    <div class="space-y-3">
+      <div>
+        <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Device Type</label>
+        <p class="mt-1 text-gray-900 dark:text-white">${unit.device_type || '--'}</p>
+      </div>
+
+      ${unit.unit_type ? `
+      <div>
+        <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Unit Type</label>
+        <p class="mt-1 text-gray-900 dark:text-white">${unit.unit_type}</p>
+      </div>
+      ` : ''}
+
+      ${unit.project_id ? `
+      <div>
+        <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Project ID</label>
+        <p class="mt-1 text-gray-900 dark:text-white">${unit.project_id}</p>
+      </div>
+      ` : ''}
+
+      ${unit.address ? `
+      <div>
+        <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Address</label>
+        ${navUrl ? `
+        <a href="${navUrl}" target="_blank" class="mt-1 flex items-center gap-2 text-seismo-orange hover:text-orange-600 dark:text-seismo-orange dark:hover:text-orange-400">
+          <svg class="w-4 h-4 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17.657 16.657L13.414 20.9a1.998 1.998 0 01-2.827 0l-4.244-4.243a8 8 0 1111.314 0z"></path>
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 11a3 3 0 11-6 0 3 3 0 016 0z"></path>
+          </svg>
+          <span class="underline">${unit.address}</span>
+        </a>
+        ` : `
+        <p class="mt-1 text-gray-900 dark:text-white">${unit.address}</p>
+        `}
+      </div>
+      ` : ''}
+
+      ${unit.coordinates && !unit.address ? `
+      <div>
+        <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Coordinates</label>
+        ${navUrl ? `
+        <a href="${navUrl}" target="_blank" class="mt-1 flex items-center gap-2 text-seismo-orange hover:text-orange-600 dark:text-seismo-orange dark:hover:text-orange-400">
+          <svg class="w-4 h-4 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17.657 16.657L13.414 20.9a1.998 1.998 0 01-2.827 0l-4.244-4.243a8 8 0 1111.314 0z"></path>
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 11a3 3 0 11-6 0 3 3 0 016 0z"></path>
+          </svg>
+          <span class="font-mono text-sm underline">${unit.coordinates}</span>
+        </a>
+        ` : `
+        <p class="mt-1 text-gray-900 dark:text-white font-mono text-sm">${unit.coordinates}</p>
+        `}
+      </div>
+      ` : ''}
+
+      <!-- Seismograph-specific fields -->
+      ${unit.device_type === 'seismograph' ? `
+        ${unit.last_calibrated ? `
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Last Calibrated</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.last_calibrated}</p>
+        </div>
+        ` : ''}
+
+        ${unit.next_calibration_due ? `
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Next Calibration Due</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.next_calibration_due}</p>
+        </div>
+        ` : ''}
+
+        ${unit.deployed_with_modem_id ? `
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Deployed With Modem</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.deployed_with_modem_id}</p>
+        </div>
+        ` : ''}
+      ` : ''}
+
+      <!-- Modem-specific fields -->
+      ${unit.device_type === 'modem' ? `
+        ${unit.ip_address ? `
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">IP Address</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.ip_address}</p>
+        </div>
+        ` : ''}
+
+        ${unit.phone_number ? `
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Phone Number</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.phone_number}</p>
+        </div>
+        ` : ''}
+
+        ${unit.hardware_model ? `
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Hardware Model</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.hardware_model}</p>
+        </div>
+        ` : ''}
+      ` : ''}
+
+      ${unit.note ? `
+      <div>
+        <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Notes</label>
+        <p class="mt-1 text-gray-900 dark:text-white whitespace-pre-wrap">${unit.note}</p>
+      </div>
+      ` : ''}
+
+      <div class="grid grid-cols-2 gap-3 pt-2">
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Deployed</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.deployed ? 'Yes' : 'No'}</p>
+        </div>
+        <div>
+          <label class="text-xs font-medium text-gray-500 dark:text-gray-400">Retired</label>
+          <p class="mt-1 text-gray-900 dark:text-white">${unit.retired ? 'Yes' : 'No'}</p>
+        </div>
+      </div>
+    </div>
+  `;
+
+  // Update action buttons
+  const editBtn = document.getElementById('modalEditBtn');
+  const deployBtn = document.getElementById('modalDeployBtn');
+  const deleteBtn = document.getElementById('modalDeleteBtn');
+
+  if (editBtn) {
+    editBtn.onclick = () => {
+      window.location.href = `/unit/${unit.id}`;
+    };
+  }
+
+  if (deployBtn) {
+    deployBtn.textContent = unit.deployed ? 'Bench Unit' : 'Deploy Unit';
+    deployBtn.onclick = () => toggleDeployStatus(unit.id, !unit.deployed);
+  }
+
+  if (deleteBtn) {
+    deleteBtn.onclick = () => deleteUnit(unit.id);
+  }
+}
+
+function getUnitStatus(unitId, unit = null) {
+  // Prefer roster table data if it was rendered with the current view
+  if (window.rosterStatusMap && window.rosterStatusMap[unitId]) {
+    return window.rosterStatusMap[unitId];
+  }
+
+  // Try to get status from dashboard snapshot if it exists
+  if (window.lastStatusSnapshot && window.lastStatusSnapshot.units && window.lastStatusSnapshot.units[unitId]) {
+    const unitStatus = window.lastStatusSnapshot.units[unitId];
+    return {
+      status: unitStatus.status,
+      age: unitStatus.age,
+      last: unitStatus.last
+    };
+  }
+
+  // Fallback: if unit data is provided, derive status from deployment state
+  if (unit) {
+    if (unit.deployed) {
+      // For deployed units without status data, default to "Unknown"
+      return { status: 'Unknown', age: '--', last: '--' };
+    } else {
+      // For benched units, use "N/A" which will be displayed as "Benched"
+      return { status: 'N/A', age: '--', last: '--' };
+    }
+  }
+
+  return { status: 'Unknown', age: '--', last: '--' };
+}
+
+async function toggleDeployStatus(unitId, deployed) {
+  try {
+    const formData = new FormData();
+    formData.append('deployed', deployed ? 'true' : 'false');
+
+    const response = await fetch(`/api/roster/edit/${unitId}`, {
+      method: 'POST',
+      body: formData
+    });
+
+    if (response.ok) {
+      showToast('✓ Unit updated successfully');
+      closeUnitModal();
+
+      // Trigger HTMX refresh if on roster page
+      const rosterTable = document.querySelector('[hx-get*="roster"]');
+      if (rosterTable) {
+        htmx.trigger(rosterTable, 'refresh');
+      }
+    } else {
+      showToast('❌ Failed to update unit', 'error');
+    }
+  } catch (error) {
+    console.error('Error toggling deploy status:', error);
+    showToast('❌ Failed to update unit', 'error');
+  }
+}
+
+async function deleteUnit(unitId) {
+  if (!confirm(`Are you sure you want to delete unit ${unitId}?\n\nThis action cannot be undone!`)) {
+    return;
+  }
+
+  try {
+    const response = await fetch(`/api/roster/${unitId}`, {
+      method: 'DELETE'
+    });
+
+    if (response.ok) {
+      showToast('✓ Unit deleted successfully');
+      closeUnitModal();
+
+      // Refresh roster page if present
+      const rosterTable = document.querySelector('[hx-get*="roster"]');
+      if (rosterTable) {
+        htmx.trigger(rosterTable, 'refresh');
+      }
+    } else {
+      showToast('❌ Failed to delete unit', 'error');
+    }
+  } catch (error) {
+    console.error('Error deleting unit:', error);
+    showToast('❌ Failed to delete unit', 'error');
+  }
+}
+
+// ===== ONLINE/OFFLINE STATUS =====
+function updateOnlineStatus() {
+  isOnline = navigator.onLine;
+  const offlineIndicator = document.getElementById('offlineIndicator');
+
+  if (offlineIndicator) {
+    if (isOnline) {
+      offlineIndicator.classList.remove('show');
+      // Trigger sync when coming back online
+      if (window.offlineDB) {
+        syncPendingEdits();
+      }
+    } else {
+      offlineIndicator.classList.add('show');
+    }
+  }
+}
+
+window.addEventListener('online', updateOnlineStatus);
+window.addEventListener('offline', updateOnlineStatus);
+
+// ===== SYNC FUNCTIONALITY =====
+async function syncPendingEdits() {
+  if (!window.offlineDB) return;
+
+  try {
+    const pendingEdits = await window.offlineDB.getPendingEdits();
+
+    if (pendingEdits.length === 0) return;
+
+    console.log(`Syncing ${pendingEdits.length} pending edits...`);
+
+    for (const edit of pendingEdits) {
+      try {
+        const formData = new FormData();
+        for (const [key, value] of Object.entries(edit.changes)) {
+          formData.append(key, value);
+        }
+
+        const response = await fetch(`/api/roster/edit/${edit.unitId}`, {
+          method: 'POST',
+          body: formData
+        });
+
+        if (response.ok) {
+          await window.offlineDB.clearEdit(edit.id);
+          console.log(`Synced edit ${edit.id} for unit ${edit.unitId}`);
+        } else {
+          console.error(`Failed to sync edit ${edit.id}`);
+        }
+      } catch (error) {
+        console.error(`Error syncing edit ${edit.id}:`, error);
+        // Keep in queue for next sync attempt
+      }
+    }
+
+    // Show success toast
+    showToast('✓ Synced successfully');
+
+  } catch (error) {
+    console.error('Error in syncPendingEdits:', error);
+  }
+}
+
+// Manual sync button
+function manualSync() {
+  if (!isOnline) {
+    showToast('⚠️ Cannot sync while offline', 'warning');
+    return;
+  }
+
+  syncPendingEdits();
+}
+
+// ===== TOAST NOTIFICATIONS =====
+function showToast(message, type = 'success') {
+  const toast = document.getElementById('syncToast');
+  if (!toast) return;
+
+  // Update toast appearance based on type
+  toast.classList.remove('bg-green-500', 'bg-red-500', 'bg-yellow-500');
+
+  if (type === 'success') {
+    toast.classList.add('bg-green-500');
+  } else if (type === 'error') {
+    toast.classList.add('bg-red-500');
+  } else if (type === 'warning') {
+    toast.classList.add('bg-yellow-500');
+  }
+
+  toast.textContent = message;
+  toast.classList.add('show');
+
+  // Auto-hide after 3 seconds
+  setTimeout(() => {
+    toast.classList.remove('show');
+  }, 3000);
+}
+
+// ===== BOTTOM NAV ACTIVE STATE =====
+function updateBottomNavActiveState() {
+  const currentPath = window.location.pathname;
+  const navButtons = document.querySelectorAll('.bottom-nav-btn');
+
+  navButtons.forEach(btn => {
+    const href = btn.getAttribute('data-href');
+    if (href && (currentPath === href || (href !== '/' && currentPath.startsWith(href)))) {
+      btn.classList.add('active');
+    } else {
+      btn.classList.remove('active');
+    }
+  });
+}
+
+// ===== INITIALIZATION =====
+document.addEventListener('DOMContentLoaded', () => {
+  // Initialize online/offline status
+  updateOnlineStatus();
+
+  // Update bottom nav active state
+  updateBottomNavActiveState();
+
+  // Add resize listener
+  window.addEventListener('resize', handleResize);
+
+  // Close menu on navigation (for mobile)
+  document.addEventListener('click', (e) => {
+    const link = e.target.closest('a');
+    if (link && link.closest('#sidebar')) {
+      // Delay to allow navigation to start
+      setTimeout(() => {
+        if (window.innerWidth < 768) {
+          closeMenuFromBackdrop();
+        }
+      }, 100);
+    }
+  });
+
+  // Prevent scroll when modals are open (iOS fix)
+  document.addEventListener('touchmove', (e) => {
+    const modal = document.querySelector('.unit-modal.show, #sidebar.open');
+    if (modal && !e.target.closest('.unit-modal-content, #sidebar')) {
+      e.preventDefault();
+    }
+  }, { passive: false });
+
+  console.log('Mobile.js initialized');
+});
+
+// ===== SERVICE WORKER REGISTRATION =====
+if ('serviceWorker' in navigator) {
+  navigator.serviceWorker.register('/sw.js')
+    .then(registration => {
+      console.log('Service Worker registered:', registration);
+
+      // Check for updates periodically
+      setInterval(() => {
+        registration.update();
+      }, 60 * 60 * 1000); // Check every hour
+    })
+    .catch(error => {
+      console.error('Service Worker registration failed:', error);
+    });
+
+  // Listen for service worker updates
+  navigator.serviceWorker.addEventListener('controllerchange', () => {
+    console.log('Service Worker updated, reloading page...');
+    window.location.reload();
+  });
+}
+
+// Export functions for global use
+window.toggleMenu = toggleMenu;
+window.closeMenuFromBackdrop = closeMenuFromBackdrop;
+window.openUnitModal = openUnitModal;
+window.closeUnitModal = closeUnitModal;
+window.manualSync = manualSync;
+window.showToast = showToast;

backend/static/offline-db.js

@@ -0,0 +1,349 @@
+/* IndexedDB wrapper for offline data storage in SFM */
+/* Handles unit data, status snapshots, and pending edit queue */
+
+class OfflineDB {
+  constructor() {
+    this.dbName = 'sfm-offline-db';
+    this.version = 1;
+    this.db = null;
+  }
+
+  // Initialize database
+  async init() {
+    return new Promise((resolve, reject) => {
+      const request = indexedDB.open(this.dbName, this.version);
+
+      request.onerror = () => {
+        console.error('IndexedDB error:', request.error);
+        reject(request.error);
+      };
+
+      request.onsuccess = () => {
+        this.db = request.result;
+        console.log('IndexedDB initialized successfully');
+        resolve(this.db);
+      };
+
+      request.onupgradeneeded = (event) => {
+        const db = event.target.result;
+
+        // Units store - full unit details
+        if (!db.objectStoreNames.contains('units')) {
+          const unitsStore = db.createObjectStore('units', { keyPath: 'id' });
+          unitsStore.createIndex('device_type', 'device_type', { unique: false });
+          unitsStore.createIndex('deployed', 'deployed', { unique: false });
+          console.log('Created units object store');
+        }
+
+        // Status snapshot store - latest status data
+        if (!db.objectStoreNames.contains('status-snapshot')) {
+          db.createObjectStore('status-snapshot', { keyPath: 'timestamp' });
+          console.log('Created status-snapshot object store');
+        }
+
+        // Pending edits store - offline edit queue
+        if (!db.objectStoreNames.contains('pending-edits')) {
+          const editsStore = db.createObjectStore('pending-edits', {
+            keyPath: 'id',
+            autoIncrement: true
+          });
+          editsStore.createIndex('unitId', 'unitId', { unique: false });
+          editsStore.createIndex('timestamp', 'timestamp', { unique: false });
+          console.log('Created pending-edits object store');
+        }
+      };
+    });
+  }
+
+  // ===== UNITS OPERATIONS =====
+
+  // Save or update a unit
+  async saveUnit(unit) {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['units'], 'readwrite');
+      const store = transaction.objectStore('units');
+      const request = store.put(unit);
+
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Get a single unit by ID
+  async getUnit(unitId) {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['units'], 'readonly');
+      const store = transaction.objectStore('units');
+      const request = store.get(unitId);
+
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Get all units
+  async getAllUnits() {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['units'], 'readonly');
+      const store = transaction.objectStore('units');
+      const request = store.getAll();
+
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Delete a unit
+  async deleteUnit(unitId) {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['units'], 'readwrite');
+      const store = transaction.objectStore('units');
+      const request = store.delete(unitId);
+
+      request.onsuccess = () => resolve();
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // ===== STATUS SNAPSHOT OPERATIONS =====
+
+  // Save status snapshot
+  async saveSnapshot(snapshot) {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['status-snapshot'], 'readwrite');
+      const store = transaction.objectStore('status-snapshot');
+
+      // Add timestamp
+      const snapshotWithTimestamp = {
+        ...snapshot,
+        timestamp: Date.now()
+      };
+
+      const request = store.put(snapshotWithTimestamp);
+
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Get latest status snapshot
+  async getLatestSnapshot() {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['status-snapshot'], 'readonly');
+      const store = transaction.objectStore('status-snapshot');
+      const request = store.getAll();
+
+      request.onsuccess = () => {
+        const snapshots = request.result;
+        if (snapshots.length > 0) {
+          // Return the most recent snapshot
+          const latest = snapshots.reduce((prev, current) =>
+            (prev.timestamp > current.timestamp) ? prev : current
+          );
+          resolve(latest);
+        } else {
+          resolve(null);
+        }
+      };
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Clear old snapshots (keep only latest)
+  async clearOldSnapshots() {
+    if (!this.db) await this.init();
+
+    return new Promise(async (resolve, reject) => {
+      const transaction = this.db.transaction(['status-snapshot'], 'readwrite');
+      const store = transaction.objectStore('status-snapshot');
+      const getAllRequest = store.getAll();
+
+      getAllRequest.onsuccess = () => {
+        const snapshots = getAllRequest.result;
+
+        if (snapshots.length > 1) {
+          // Sort by timestamp, keep only the latest
+          snapshots.sort((a, b) => b.timestamp - a.timestamp);
+
+          // Delete all except the first (latest)
+          for (let i = 1; i < snapshots.length; i++) {
+            store.delete(snapshots[i].timestamp);
+          }
+        }
+
+        resolve();
+      };
+
+      getAllRequest.onerror = () => reject(getAllRequest.error);
+    });
+  }
+
+  // ===== PENDING EDITS OPERATIONS =====
+
+  // Queue an edit for offline sync
+  async queueEdit(unitId, changes) {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['pending-edits'], 'readwrite');
+      const store = transaction.objectStore('pending-edits');
+
+      const edit = {
+        unitId,
+        changes,
+        timestamp: Date.now()
+      };
+
+      const request = store.add(edit);
+
+      request.onsuccess = () => {
+        console.log(`Queued edit for unit ${unitId}`);
+        resolve(request.result);
+      };
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Get all pending edits
+  async getPendingEdits() {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['pending-edits'], 'readonly');
+      const store = transaction.objectStore('pending-edits');
+      const request = store.getAll();
+
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Get pending edits count
+  async getPendingEditsCount() {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['pending-edits'], 'readonly');
+      const store = transaction.objectStore('pending-edits');
+      const request = store.count();
+
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Clear a synced edit
+  async clearEdit(editId) {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['pending-edits'], 'readwrite');
+      const store = transaction.objectStore('pending-edits');
+      const request = store.delete(editId);
+
+      request.onsuccess = () => {
+        console.log(`Cleared edit ${editId} from queue`);
+        resolve();
+      };
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // Clear all pending edits
+  async clearAllEdits() {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['pending-edits'], 'readwrite');
+      const store = transaction.objectStore('pending-edits');
+      const request = store.clear();
+
+      request.onsuccess = () => {
+        console.log('Cleared all pending edits');
+        resolve();
+      };
+      request.onerror = () => reject(request.error);
+    });
+  }
+
+  // ===== UTILITY OPERATIONS =====
+
+  // Clear all data (for debugging/reset)
+  async clearAllData() {
+    if (!this.db) await this.init();
+
+    return new Promise((resolve, reject) => {
+      const storeNames = ['units', 'status-snapshot', 'pending-edits'];
+      const transaction = this.db.transaction(storeNames, 'readwrite');
+
+      storeNames.forEach(storeName => {
+        transaction.objectStore(storeName).clear();
+      });
+
+      transaction.oncomplete = () => {
+        console.log('Cleared all offline data');
+        resolve();
+      };
+      transaction.onerror = () => reject(transaction.error);
+    });
+  }
+
+  // Get database statistics
+  async getStats() {
+    if (!this.db) await this.init();
+
+    const unitsCount = await new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['units'], 'readonly');
+      const request = transaction.objectStore('units').count();
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+
+    const pendingEditsCount = await this.getPendingEditsCount();
+
+    const hasSnapshot = await new Promise((resolve, reject) => {
+      const transaction = this.db.transaction(['status-snapshot'], 'readonly');
+      const request = transaction.objectStore('status-snapshot').count();
+      request.onsuccess = () => resolve(request.result > 0);
+      request.onerror = () => reject(request.error);
+    });
+
+    return {
+      unitsCount,
+      pendingEditsCount,
+      hasSnapshot
+    };
+  }
+}
+
+// Create global instance
+window.offlineDB = new OfflineDB();
+
+// Initialize on page load
+document.addEventListener('DOMContentLoaded', async () => {
+  try {
+    await window.offlineDB.init();
+    console.log('Offline database ready');
+
+    // Display pending edits count if any
+    const pendingCount = await window.offlineDB.getPendingEditsCount();
+    if (pendingCount > 0) {
+      console.log(`${pendingCount} pending edits in queue`);
+      // Could show a badge in the UI here
+    }
+  } catch (error) {
+    console.error('Failed to initialize offline database:', error);
+  }
+});

backend/static/style.css

@@ -0,0 +1,12 @@
+/* Custom styles for Seismo Fleet Manager */
+
+/* Additional custom styles can go here */
+
+.card-hover {
+    transition: transform 0.2s ease, box-shadow 0.2s ease;
+}
+
+.card-hover:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
+}

backend/static/sw.js

@@ -0,0 +1,347 @@
+/* Service Worker for Seismo Fleet Manager PWA */
+/* Network-first strategy with cache fallback for real-time data */
+
+const CACHE_VERSION = 'v1';
+const STATIC_CACHE = `sfm-static-${CACHE_VERSION}`;
+const DYNAMIC_CACHE = `sfm-dynamic-${CACHE_VERSION}`;
+const DATA_CACHE = `sfm-data-${CACHE_VERSION}`;
+
+// Files to precache (critical app shell)
+const STATIC_FILES = [
+  '/',
+  '/static/style.css',
+  '/static/mobile.css',
+  '/static/mobile.js',
+  '/static/offline-db.js',
+  '/static/manifest.json',
+  'https://cdn.tailwindcss.com',
+  'https://unpkg.com/htmx.org@1.9.10',
+  'https://unpkg.com/leaflet@1.9.4/dist/leaflet.css',
+  'https://unpkg.com/leaflet@1.9.4/dist/leaflet.js'
+];
+
+// Install event - cache static files
+self.addEventListener('install', (event) => {
+  console.log('[SW] Installing service worker...');
+
+  event.waitUntil(
+    caches.open(STATIC_CACHE)
+      .then((cache) => {
+        console.log('[SW] Precaching static files');
+        return cache.addAll(STATIC_FILES);
+      })
+      .then(() => {
+        console.log('[SW] Static files cached successfully');
+        return self.skipWaiting(); // Activate immediately
+      })
+      .catch((error) => {
+        console.error('[SW] Precaching failed:', error);
+      })
+  );
+});
+
+// Activate event - clean up old caches
+self.addEventListener('activate', (event) => {
+  console.log('[SW] Activating service worker...');
+
+  event.waitUntil(
+    caches.keys()
+      .then((cacheNames) => {
+        return Promise.all(
+          cacheNames.map((cacheName) => {
+            // Delete old caches that don't match current version
+            if (cacheName !== STATIC_CACHE &&
+                cacheName !== DYNAMIC_CACHE &&
+                cacheName !== DATA_CACHE) {
+              console.log('[SW] Deleting old cache:', cacheName);
+              return caches.delete(cacheName);
+            }
+          })
+        );
+      })
+      .then(() => {
+        console.log('[SW] Service worker activated');
+        return self.clients.claim(); // Take control of all pages
+      })
+  );
+});
+
+// Fetch event - network-first strategy
+self.addEventListener('fetch', (event) => {
+  const { request } = event;
+  const url = new URL(request.url);
+
+  // Skip non-GET requests
+  if (request.method !== 'GET') {
+    return;
+  }
+
+  // Skip chrome-extension and other non-http(s) requests
+  if (!url.protocol.startsWith('http')) {
+    return;
+  }
+
+  // API requests - network first, cache fallback
+  if (url.pathname.startsWith('/api/')) {
+    event.respondWith(networkFirstStrategy(request, DATA_CACHE));
+    return;
+  }
+
+  // Static assets - cache first
+  if (isStaticAsset(url.pathname)) {
+    event.respondWith(cacheFirstStrategy(request, STATIC_CACHE));
+    return;
+  }
+
+  // HTML pages - network first with cache fallback
+  if (request.headers.get('accept')?.includes('text/html')) {
+    event.respondWith(networkFirstStrategy(request, DYNAMIC_CACHE));
+    return;
+  }
+
+  // Everything else - network first
+  event.respondWith(networkFirstStrategy(request, DYNAMIC_CACHE));
+});
+
+// Network-first strategy
+async function networkFirstStrategy(request, cacheName) {
+  try {
+    // Try network first
+    const networkResponse = await fetch(request);
+
+    // Cache successful responses
+    if (networkResponse && networkResponse.status === 200) {
+      const cache = await caches.open(cacheName);
+      cache.put(request, networkResponse.clone());
+    }
+
+    return networkResponse;
+  } catch (error) {
+    // Network failed, try cache
+    console.log('[SW] Network failed, trying cache:', request.url);
+    const cachedResponse = await caches.match(request);
+
+    if (cachedResponse) {
+      console.log('[SW] Serving from cache:', request.url);
+      return cachedResponse;
+    }
+
+    // No cache available, return offline page or error
+    console.error('[SW] No cache available for:', request.url);
+
+    // For HTML requests, return a basic offline page
+    if (request.headers.get('accept')?.includes('text/html')) {
+      return new Response(
+        `<!DOCTYPE html>
+        <html lang="en">
+        <head>
+          <meta charset="UTF-8">
+          <meta name="viewport" content="width=device-width, initial-scale=1.0">
+          <title>Offline - SFM</title>
+          <style>
+            body {
+              font-family: system-ui, -apple-system, sans-serif;
+              display: flex;
+              align-items: center;
+              justify-content: center;
+              min-height: 100vh;
+              margin: 0;
+              background: #f3f4f6;
+              color: #1f2937;
+            }
+            .container {
+              text-align: center;
+              padding: 2rem;
+            }
+            h1 { color: #f48b1c; margin-bottom: 1rem; }
+            p { margin-bottom: 1.5rem; color: #6b7280; }
+            button {
+              background: #f48b1c;
+              color: white;
+              border: none;
+              padding: 0.75rem 1.5rem;
+              border-radius: 0.5rem;
+              font-size: 1rem;
+              cursor: pointer;
+            }
+            button:hover { background: #d97706; }
+          </style>
+        </head>
+        <body>
+          <div class="container">
+            <h1>📡 You're Offline</h1>
+            <p>SFM requires an internet connection for this page.</p>
+            <p>Please check your connection and try again.</p>
+            <button onclick="location.reload()">Retry</button>
+          </div>
+        </body>
+        </html>`,
+        {
+          headers: { 'Content-Type': 'text/html' }
+        }
+      );
+    }
+
+    // For other requests, return error
+    return new Response('Network error', {
+      status: 503,
+      statusText: 'Service Unavailable'
+    });
+  }
+}
+
+// Cache-first strategy
+async function cacheFirstStrategy(request, cacheName) {
+  const cachedResponse = await caches.match(request);
+
+  if (cachedResponse) {
+    return cachedResponse;
+  }
+
+  // Not in cache, fetch from network
+  try {
+    const networkResponse = await fetch(request);
+
+    // Cache successful responses
+    if (networkResponse && networkResponse.status === 200) {
+      const cache = await caches.open(cacheName);
+      cache.put(request, networkResponse.clone());
+    }
+
+    return networkResponse;
+  } catch (error) {
+    console.error('[SW] Fetch failed:', request.url, error);
+    return new Response('Network error', {
+      status: 503,
+      statusText: 'Service Unavailable'
+    });
+  }
+}
+
+// Check if URL is a static asset
+function isStaticAsset(pathname) {
+  const staticExtensions = ['.css', '.js', '.png', '.jpg', '.jpeg', '.svg', '.ico', '.woff', '.woff2'];
+  return staticExtensions.some(ext => pathname.endsWith(ext));
+}
+
+// Background Sync - for offline edits
+self.addEventListener('sync', (event) => {
+  console.log('[SW] Background sync event:', event.tag);
+
+  if (event.tag === 'sync-edits') {
+    event.waitUntil(syncPendingEdits());
+  }
+});
+
+// Sync pending edits to server
+async function syncPendingEdits() {
+  console.log('[SW] Syncing pending edits...');
+
+  try {
+    // Get pending edits from IndexedDB
+    const db = await openDatabase();
+    const edits = await getPendingEdits(db);
+
+    if (edits.length === 0) {
+      console.log('[SW] No pending edits to sync');
+      return;
+    }
+
+    console.log(`[SW] Syncing ${edits.length} pending edits`);
+
+    // Send edits to server
+    const response = await fetch('/api/sync-edits', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({ edits })
+    });
+
+    if (response.ok) {
+      const result = await response.json();
+      console.log('[SW] Sync successful:', result);
+
+      // Clear synced edits from IndexedDB
+      await clearSyncedEdits(db, result.synced_ids || []);
+
+      // Notify all clients about successful sync
+      const clients = await self.clients.matchAll();
+      clients.forEach(client => {
+        client.postMessage({
+          type: 'SYNC_COMPLETE',
+          synced: result.synced
+        });
+      });
+    } else {
+      console.error('[SW] Sync failed:', response.status);
+    }
+  } catch (error) {
+    console.error('[SW] Sync error:', error);
+    throw error; // Will retry sync later
+  }
+}
+
+// IndexedDB helpers (simplified versions - full implementations in offline-db.js)
+function openDatabase() {
+  return new Promise((resolve, reject) => {
+    const request = indexedDB.open('sfm-offline-db', 1);
+
+    request.onerror = () => reject(request.error);
+    request.onsuccess = () => resolve(request.result);
+
+    request.onupgradeneeded = (event) => {
+      const db = event.target.result;
+
+      if (!db.objectStoreNames.contains('pending-edits')) {
+        db.createObjectStore('pending-edits', { keyPath: 'id', autoIncrement: true });
+      }
+    };
+  });
+}
+
+function getPendingEdits(db) {
+  return new Promise((resolve, reject) => {
+    const transaction = db.transaction(['pending-edits'], 'readonly');
+    const store = transaction.objectStore('pending-edits');
+    const request = store.getAll();
+
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = () => reject(request.error);
+  });
+}
+
+function clearSyncedEdits(db, editIds) {
+  return new Promise((resolve, reject) => {
+    const transaction = db.transaction(['pending-edits'], 'readwrite');
+    const store = transaction.objectStore('pending-edits');
+
+    editIds.forEach(id => {
+      store.delete(id);
+    });
+
+    transaction.oncomplete = () => resolve();
+    transaction.onerror = () => reject(transaction.error);
+  });
+}
+
+// Message event - handle messages from clients
+self.addEventListener('message', (event) => {
+  console.log('[SW] Message received:', event.data);
+
+  if (event.data.type === 'SKIP_WAITING') {
+    self.skipWaiting();
+  }
+
+  if (event.data.type === 'CLEAR_CACHE') {
+    event.waitUntil(
+      caches.keys().then((cacheNames) => {
+        return Promise.all(
+          cacheNames.map((cacheName) => caches.delete(cacheName))
+        );
+      })
+    );
+  }
+});
+
+console.log('[SW] Service Worker loaded');