Merge pull request 'version bump 0.6.1' (#28) from dev into main

Reviewed-on: #28

CHANGELOG.md

@@ -5,6 +5,18 @@ 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).
 
+## [0.6.1] - 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

README.md

@@ -1,4 +1,4 @@
-# Terra-View v0.6.0
+# Terra-View v0.6.1
 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
@@ -496,6 +496,11 @@ docker compose down -v
 
 ## Release Highlights
 
+### 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
@@ -579,7 +584,9 @@ MIT
 
 ## Version
 
-**Current: 0.6.0** — Calendar & reservation mode, device pairing interface, calibration UX overhaul, modem dashboard enhancements (2026-02-06)
+**Current: 0.6.1** — One-off recording schedules, bidirectional pairing sync, scheduler timezone fix (2026-02-16)
+
+Previous: 0.6.0 — Calendar & reservation mode, device pairing interface, calibration UX overhaul, modem dashboard enhancements (2026-02-06)
 
 Previous: 0.5.1 — Dashboard schedule view with today's actions panel, new Terra-View branding and logo rework (2026-01-27)
 

backend/main.py

@@ -30,7 +30,7 @@ Base.metadata.create_all(bind=engine)
 ENVIRONMENT = os.getenv("ENVIRONMENT", "production")
 
 # Initialize FastAPI app
-VERSION = "0.6.0"
+VERSION = "0.6.1"
 app = FastAPI(
     title="Seismo Fleet Manager",
     description="Backend API for managing seismograph fleet status",

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/models.py

@@ -321,9 +321,10 @@ class RecurringSchedule(Base):
     """
     Recurring schedule definitions for automated sound monitoring.
 
-    Supports two schedule types:
+    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"
 
@@ -333,7 +334,7 @@ class RecurringSchedule(Base):
     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"
+    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")
@@ -349,7 +350,11 @@ class RecurringSchedule(Base):
     cycle_time = Column(String, nullable=True)  # "00:00" - time to run stop/download/restart
     include_download = Column(Boolean, default=True)  # Download data before restart
 
-    # Automation options (applies to both schedule types)
+    # 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
 

backend/routers/recurring_schedules.py

@@ -186,6 +186,41 @@ async def create_recurring_schedule(
     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
@@ -207,6 +242,8 @@ async def create_recurring_schedule(
             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

backend/routers/roster_edit.py

@@ -237,7 +237,7 @@ async def add_roster_unit(
         slm_measurement_range=slm_measurement_range if slm_measurement_range else None,
     )
 
-    # Auto-fill location data from modem if pairing and fields are empty
+    # Auto-fill data from modem if pairing and fields are empty
     if deployed_with_modem_id:
         modem = db.query(RosterUnit).filter(
             RosterUnit.id == deployed_with_modem_id,
@@ -252,6 +252,24 @@ async def add_roster_unit(
                 unit.coordinates = modem.coordinates
             if not unit.project_id and modem.project_id:
                 unit.project_id = modem.project_id
+            if not unit.note and modem.note:
+                unit.note = modem.note
+
+    # Bidirectional pairing sync for new units
+    if device_type in ("seismograph", "slm") and deployed_with_modem_id:
+        modem_to_update = db.query(RosterUnit).filter(
+            RosterUnit.id == deployed_with_modem_id,
+            RosterUnit.device_type == "modem"
+        ).first()
+        if modem_to_update:
+            # Clear old device's reference if modem was paired elsewhere
+            if modem_to_update.deployed_with_unit_id and modem_to_update.deployed_with_unit_id != id:
+                old_device = db.query(RosterUnit).filter(
+                    RosterUnit.id == modem_to_update.deployed_with_unit_id
+                ).first()
+                if old_device and old_device.deployed_with_modem_id == deployed_with_modem_id:
+                    old_device.deployed_with_modem_id = None
+            modem_to_update.deployed_with_unit_id = id
 
     db.add(unit)
     db.commit()
@@ -564,7 +582,7 @@ async def edit_roster_unit(
     unit.next_calibration_due = next_cal_date
     unit.deployed_with_modem_id = deployed_with_modem_id if deployed_with_modem_id else None
 
-    # Auto-fill location data from modem if pairing and fields are empty
+    # Auto-fill data from modem if pairing and fields are empty
     if deployed_with_modem_id:
         modem = db.query(RosterUnit).filter(
             RosterUnit.id == deployed_with_modem_id,
@@ -580,6 +598,8 @@ async def edit_roster_unit(
                 unit.coordinates = modem.coordinates
             if not unit.project_id and modem.project_id:
                 unit.project_id = modem.project_id
+            if not unit.note and modem.note:
+                unit.note = modem.note
 
     # Modem-specific fields
     unit.ip_address = ip_address if ip_address else None
@@ -598,6 +618,51 @@ async def edit_roster_unit(
     unit.slm_time_weighting = slm_time_weighting if slm_time_weighting else None
     unit.slm_measurement_range = slm_measurement_range if slm_measurement_range else None
 
+    # Bidirectional pairing sync
+    new_modem_id = deployed_with_modem_id if deployed_with_modem_id else None
+    new_unit_pair_id = deployed_with_unit_id if deployed_with_unit_id else None
+
+    # When a device (seismograph/SLM) sets deployed_with_modem_id, update modem's deployed_with_unit_id
+    if device_type in ("seismograph", "slm"):
+        # Clear old modem's reference if modem changed
+        old_modem_id = db.query(RosterUnit.deployed_with_modem_id).filter(
+            RosterUnit.id == unit_id
+        ).scalar()
+        # old_modem_id is already the new value at this point since we set it above,
+        # but we need to check the *previous* modem. We already set it, so check if
+        # there's a modem pointing to us that we're no longer paired with.
+        if new_modem_id:
+            modem_to_update = db.query(RosterUnit).filter(
+                RosterUnit.id == new_modem_id,
+                RosterUnit.device_type == "modem"
+            ).first()
+            if modem_to_update and modem_to_update.deployed_with_unit_id != unit_id:
+                # Clear old device's reference to this modem if modem was paired elsewhere
+                if modem_to_update.deployed_with_unit_id:
+                    old_device = db.query(RosterUnit).filter(
+                        RosterUnit.id == modem_to_update.deployed_with_unit_id
+                    ).first()
+                    if old_device and old_device.deployed_with_modem_id == new_modem_id:
+                        old_device.deployed_with_modem_id = None
+                modem_to_update.deployed_with_unit_id = unit_id
+
+    # When a modem sets deployed_with_unit_id, update device's deployed_with_modem_id
+    if device_type == "modem":
+        if new_unit_pair_id:
+            device_to_update = db.query(RosterUnit).filter(
+                RosterUnit.id == new_unit_pair_id,
+                RosterUnit.device_type.in_(["seismograph", "slm"])
+            ).first()
+            if device_to_update and device_to_update.deployed_with_modem_id != unit_id:
+                # Clear old modem's reference to this device if device was paired elsewhere
+                if device_to_update.deployed_with_modem_id:
+                    old_modem = db.query(RosterUnit).filter(
+                        RosterUnit.id == device_to_update.deployed_with_modem_id
+                    ).first()
+                    if old_modem and old_modem.deployed_with_unit_id == new_unit_pair_id:
+                        old_modem.deployed_with_unit_id = None
+                device_to_update.deployed_with_modem_id = unit_id
+
     # Record history entries for changed fields
     if old_note != note:
         record_history(db, unit_id, "note_change", "note", old_note, note, "manual")

backend/services/recurring_schedule_service.py

@@ -49,6 +49,8 @@ class RecurringScheduleService:
         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.
@@ -57,7 +59,7 @@ class RecurringScheduleService:
             project_id: Project ID
             location_id: Monitoring location ID
             name: Schedule name
-            schedule_type: "weekly_calendar" or "simple_interval"
+            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
@@ -66,6 +68,8 @@ class RecurringScheduleService:
             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
@@ -85,6 +89,8 @@ class RecurringScheduleService:
             auto_increment_index=auto_increment_index,
             enabled=True,
             timezone=timezone,
+            start_datetime=start_datetime,
+            end_datetime=end_datetime,
         )
 
         # Calculate next occurrence
@@ -213,6 +219,8 @@ class RecurringScheduleService:
             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 []
@@ -431,6 +439,77 @@ class RecurringScheduleService:
 
         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:
@@ -471,6 +550,13 @@ class RecurringScheduleService:
                     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]:

backend/services/scheduler.py

@@ -628,6 +628,15 @@ class SchedulerService:
 
             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:

backend/services/slmm_client.py

@@ -112,6 +112,69 @@ class SLMMClient:
             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
     # ========================================================================
@@ -537,10 +600,13 @@ class SLMMClient:
             remote_path: Path on device to download (e.g., "/NL43_DATA/measurement.wav")
 
         Returns:
-            Binary file content (as response)
+            Dict with local_path, filename, size_bytes
         """
-        data = {"remote_path": remote_path}
+        return await self._download_request(
-        return await self._request("POST", f"/{unit_id}/ftp/download", data=data)
+            f"/{unit_id}/ftp/download",
+            {"remote_path": remote_path},
+            unit_id,
+        )
 
     async def download_folder(
         self,
@@ -557,10 +623,13 @@ class SLMMClient:
             remote_path: Folder path on device to download (e.g., "/NL43_DATA/Auto_0000")
 
         Returns:
-            Dict with local_path, folder_name, file_count, zip_size_bytes
+            Dict with local_path, folder_name, size_bytes
         """
-        data = {"remote_path": remote_path}
+        return await self._download_request(
-        return await self._request("POST", f"/{unit_id}/ftp/download-folder", data=data)
+            f"/{unit_id}/ftp/download-folder",
+            {"remote_path": remote_path},
+            unit_id,
+        )
 
     async def download_current_measurement(
         self,

templates/base.html

@@ -398,10 +398,10 @@
     </script>
 
     <!-- Offline Database -->
-    <script src="/static/offline-db.js?v=0.5.1"></script>
+    <script src="/static/offline-db.js?v=0.6.1"></script>
 
     <!-- Mobile JavaScript -->
-    <script src="/static/mobile.js?v=0.5.1"></script>
+    <script src="/static/mobile.js?v=0.6.1"></script>
 
     {% block extra_scripts %}{% endblock %}
 </body>

templates/partials/projects/recurring_schedule_list.html

@@ -18,6 +18,10 @@
                         <span class="px-2 py-0.5 text-xs font-medium rounded-full bg-blue-100 text-blue-700 dark:bg-blue-900/30 dark:text-blue-300">
                             Weekly
                         </span>
+                        {% elif item.schedule.schedule_type == 'one_off' %}
+                        <span class="px-2 py-0.5 text-xs font-medium rounded-full bg-amber-100 text-amber-700 dark:bg-amber-900/30 dark:text-amber-300">
+                            One-Off
+                        </span>
                         {% else %}
                         <span class="px-2 py-0.5 text-xs font-medium rounded-full bg-purple-100 text-purple-700 dark:bg-purple-900/30 dark:text-purple-300">
                             24/7 Cycle
@@ -69,6 +73,20 @@
                                     (with download)
                                 {% endif %}
                             </div>
+                        {% elif item.schedule.schedule_type == 'one_off' %}
+                            <div class="flex items-center gap-2">
+                                <svg class="w-4 h-4 text-amber-500 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z"/>
+                                </svg>
+                                {% if item.schedule.start_datetime %}
+                                    {{ item.schedule.start_datetime|local_datetime }} {{ timezone_abbr() }}
+                                    &rarr;
+                                    {{ item.schedule.end_datetime|local_datetime }} {{ timezone_abbr() }}
+                                {% endif %}
+                                {% if item.schedule.include_download %}
+                                    (with download)
+                                {% endif %}
+                            </div>
                         {% endif %}
 
                         {% if item.schedule.next_occurrence %}

templates/partials/projects/schedule_oneoff.html

@@ -0,0 +1,204 @@
+<!-- One-Off Recording Schedule Editor -->
+<!-- Used for single start/stop recordings with a specific date+time range -->
+
+<div id="schedule-oneoff-editor" class="space-y-4">
+    <div class="mb-4">
+        <h4 class="text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">One-Off Recording</h4>
+        <p class="text-xs text-gray-500 dark:text-gray-400">
+            Schedule a single recording session with a specific start and end time.
+            Duration can be between 15 minutes and 24 hours.
+        </p>
+    </div>
+
+    <!-- Info box -->
+    <div class="bg-amber-50 dark:bg-amber-900/20 border border-amber-200 dark:border-amber-800 rounded-lg p-4">
+        <div class="flex gap-3">
+            <svg class="w-5 h-5 text-amber-500 flex-shrink-0 mt-0.5" fill="currentColor" viewBox="0 0 20 20">
+                <path fill-rule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z" clip-rule="evenodd"/>
+            </svg>
+            <div class="text-sm text-amber-700 dark:text-amber-300">
+                <p class="font-medium mb-1">How it works:</p>
+                <ol class="list-decimal list-inside space-y-1 text-xs">
+                    <li>At the start time, the measurement will <strong>start</strong></li>
+                    <li>At the end time, the measurement will <strong>stop</strong></li>
+                    <li>If enabled, data will be <strong>downloaded</strong> via FTP after stop</li>
+                    <li>The schedule will be <strong>auto-disabled</strong> after completion</li>
+                </ol>
+            </div>
+        </div>
+    </div>
+
+    <!-- Start date/time -->
+    <div class="bg-gray-50 dark:bg-gray-700/50 rounded-lg p-4">
+        <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">
+            Start Date & Time
+        </label>
+        <input type="datetime-local"
+               name="start_datetime"
+               id="oneoff_start_datetime"
+               class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-seismo-orange focus:border-seismo-orange">
+        <p class="text-xs text-gray-400 dark:text-gray-500 mt-2">
+            Must be in the future
+        </p>
+    </div>
+
+    <!-- End date/time -->
+    <div class="bg-gray-50 dark:bg-gray-700/50 rounded-lg p-4">
+        <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">
+            End Date & Time
+        </label>
+        <input type="datetime-local"
+               name="end_datetime"
+               id="oneoff_end_datetime"
+               class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-seismo-orange focus:border-seismo-orange">
+    </div>
+
+    <!-- Duration preview -->
+    <div id="oneoff-duration-preview" class="hidden bg-gray-50 dark:bg-gray-700/50 rounded-lg p-4">
+        <div class="flex items-center gap-3">
+            <svg class="w-5 h-5 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"/>
+            </svg>
+            <div>
+                <span class="text-sm font-medium text-gray-700 dark:text-gray-300">Duration: </span>
+                <span id="oneoff-duration-text" class="text-sm text-gray-600 dark:text-gray-400"></span>
+            </div>
+        </div>
+        <p id="oneoff-duration-error" class="hidden text-xs text-red-500 mt-2"></p>
+    </div>
+
+    <!-- Download option -->
+    <div class="bg-gray-50 dark:bg-gray-700/50 rounded-lg p-4">
+        <label class="flex items-start gap-3 cursor-pointer">
+            <input type="checkbox"
+                   name="include_download"
+                   id="include_download_oneoff"
+                   class="rounded text-seismo-orange focus:ring-seismo-orange mt-0.5"
+                   checked>
+            <div>
+                <span class="text-sm font-medium text-gray-700 dark:text-gray-300">
+                    Download data after recording ends
+                </span>
+                <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">
+                    When enabled, measurement data will be downloaded via FTP after the recording stops.
+                </p>
+            </div>
+        </label>
+    </div>
+
+    <!-- Auto-increment index option -->
+    <div class="bg-gray-50 dark:bg-gray-700/50 rounded-lg p-4">
+        <label class="flex items-start gap-3 cursor-pointer">
+            <input type="checkbox"
+                   name="auto_increment_index"
+                   id="auto_increment_index_oneoff"
+                   class="rounded text-seismo-orange focus:ring-seismo-orange mt-0.5"
+                   checked>
+            <div>
+                <span class="text-sm font-medium text-gray-700 dark:text-gray-300">
+                    Auto-increment store index before start
+                </span>
+                <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">
+                    When enabled, the store/index number is incremented before starting.
+                    This prevents "overwrite existing data?" prompts on the device.
+                </p>
+            </div>
+        </label>
+    </div>
+</div>
+
+<script>
+// Set min datetime to now (prevent past selections)
+function setMinDatetime() {
+    const now = new Date();
+    now.setMinutes(Math.ceil(now.getMinutes() / 15) * 15);
+    now.setSeconds(0);
+    now.setMilliseconds(0);
+    const minStr = `${now.getFullYear()}-${String(now.getMonth()+1).padStart(2,'0')}-${String(now.getDate()).padStart(2,'0')}T${String(now.getHours()).padStart(2,'0')}:${String(now.getMinutes()).padStart(2,'0')}`;
+    document.getElementById('oneoff_start_datetime').min = minStr;
+    document.getElementById('oneoff_end_datetime').min = minStr;
+}
+
+setMinDatetime();
+
+// Update duration preview when dates change
+function updateDurationPreview() {
+    const startInput = document.getElementById('oneoff_start_datetime');
+    const endInput = document.getElementById('oneoff_end_datetime');
+    const preview = document.getElementById('oneoff-duration-preview');
+    const durationText = document.getElementById('oneoff-duration-text');
+    const errorText = document.getElementById('oneoff-duration-error');
+
+    if (!startInput.value || !endInput.value) {
+        preview.classList.add('hidden');
+        return;
+    }
+
+    const start = new Date(startInput.value);
+    const end = new Date(endInput.value);
+    const diffMs = end - start;
+    const diffMinutes = diffMs / (1000 * 60);
+
+    preview.classList.remove('hidden');
+    errorText.classList.add('hidden');
+
+    if (diffMinutes <= 0) {
+        durationText.textContent = 'Invalid';
+        errorText.textContent = 'End time must be after start time.';
+        errorText.classList.remove('hidden');
+        return;
+    }
+
+    if (diffMinutes < 15) {
+        const mins = Math.round(diffMinutes);
+        durationText.textContent = `${mins} minute${mins !== 1 ? 's' : ''}`;
+        errorText.textContent = 'Minimum duration is 15 minutes.';
+        errorText.classList.remove('hidden');
+        return;
+    }
+
+    if (diffMinutes > 1440) {
+        const hours = Math.round(diffMinutes / 60 * 10) / 10;
+        durationText.textContent = `${hours} hours`;
+        errorText.textContent = 'Maximum duration is 24 hours.';
+        errorText.classList.remove('hidden');
+        return;
+    }
+
+    // Valid duration
+    if (diffMinutes < 60) {
+        durationText.textContent = `${Math.round(diffMinutes)} minutes`;
+    } else {
+        const hours = Math.floor(diffMinutes / 60);
+        const mins = Math.round(diffMinutes % 60);
+        durationText.textContent = mins > 0
+            ? `${hours} hour${hours !== 1 ? 's' : ''} ${mins} min`
+            : `${hours} hour${hours !== 1 ? 's' : ''}`;
+    }
+}
+
+document.getElementById('oneoff_start_datetime').addEventListener('change', function() {
+    // Auto-set end to start + 1 hour if end is empty
+    const endInput = document.getElementById('oneoff_end_datetime');
+    if (!endInput.value) {
+        const start = new Date(this.value);
+        start.setHours(start.getHours() + 1);
+        endInput.value = start.toISOString().slice(0, 16);
+    }
+    // Update min of end input
+    endInput.min = this.value;
+    updateDurationPreview();
+});
+
+document.getElementById('oneoff_end_datetime').addEventListener('change', updateDurationPreview);
+
+// Function to get one-off data as object (called by parent form)
+function getOneOffData() {
+    return {
+        start_datetime: document.getElementById('oneoff_start_datetime').value,
+        end_datetime: document.getElementById('oneoff_end_datetime').value,
+        include_download: document.getElementById('include_download_oneoff').checked,
+        auto_increment_index: document.getElementById('auto_increment_index_oneoff').checked,
+    };
+}
+</script>

templates/projects/detail.html

@@ -456,7 +456,7 @@
             <!-- Schedule Type Selection -->
             <div>
                 <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-3">Schedule Type</label>
-                <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
+                <div class="grid grid-cols-1 md:grid-cols-3 gap-4">
                     <label class="relative cursor-pointer">
                         <input type="radio" name="schedule_type" value="weekly_calendar" class="peer sr-only" checked onchange="toggleScheduleType('weekly_calendar')">
                         <div class="p-4 border-2 border-gray-200 dark:border-gray-600 rounded-lg peer-checked:border-seismo-orange peer-checked:bg-orange-50 dark:peer-checked:bg-orange-900/20 transition-colors">
@@ -485,6 +485,20 @@
                             </p>
                         </div>
                     </label>
+                    <label class="relative cursor-pointer">
+                        <input type="radio" name="schedule_type" value="one_off" class="peer sr-only" onchange="toggleScheduleType('one_off')">
+                        <div class="p-4 border-2 border-gray-200 dark:border-gray-600 rounded-lg peer-checked:border-seismo-orange peer-checked:bg-orange-50 dark:peer-checked:bg-orange-900/20 transition-colors">
+                            <div class="flex items-center gap-3 mb-2">
+                                <svg class="w-6 h-6 text-gray-500 peer-checked:text-seismo-orange" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z"/>
+                                </svg>
+                                <span class="font-medium text-gray-900 dark:text-white">One-Off Recording</span>
+                            </div>
+                            <p class="text-xs text-gray-500 dark:text-gray-400">
+                                Single recording session with a specific start and end date/time (15 min - 24 hrs).
+                            </p>
+                        </div>
+                    </label>
                 </div>
             </div>
 
@@ -498,6 +512,11 @@
                 {% include "partials/projects/schedule_interval.html" %}
             </div>
 
+            <!-- One-Off Editor -->
+            <div id="schedule-oneoff-wrapper" class="hidden">
+                {% include "partials/projects/schedule_oneoff.html" %}
+            </div>
+
             <!-- Timezone -->
             <div>
                 <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Timezone</label>
@@ -1108,13 +1127,18 @@ function getSelectedLocationIds() {
 function toggleScheduleType(type) {
     const weeklyEditor = document.getElementById('schedule-weekly-wrapper');
     const intervalEditor = document.getElementById('schedule-interval-wrapper');
+    const oneoffEditor = document.getElementById('schedule-oneoff-wrapper');
+
+    weeklyEditor.classList.add('hidden');
+    intervalEditor.classList.add('hidden');
+    oneoffEditor.classList.add('hidden');
 
     if (type === 'weekly_calendar') {
         weeklyEditor.classList.remove('hidden');
-        intervalEditor.classList.add('hidden');
+    } else if (type === 'simple_interval') {
-    } else {
-        weeklyEditor.classList.add('hidden');
         intervalEditor.classList.remove('hidden');
+    } else if (type === 'one_off') {
+        oneoffEditor.classList.remove('hidden');
     }
 }
 
@@ -1178,7 +1202,7 @@ document.getElementById('schedule-form').addEventListener('submit', async functi
         } else {
             payload.include_download = true;
         }
-    } else {
+    } else if (scheduleType === 'simple_interval') {
         // Get interval data
         if (typeof getIntervalData === 'function') {
             const intervalData = getIntervalData();
@@ -1190,6 +1214,45 @@ document.getElementById('schedule-form').addEventListener('submit', async functi
             showScheduleError('Interval editor not loaded properly.');
             return;
         }
+    } else if (scheduleType === 'one_off') {
+        // Get one-off data
+        if (typeof getOneOffData === 'function') {
+            const oneOffData = getOneOffData();
+
+            if (!oneOffData.start_datetime || !oneOffData.end_datetime) {
+                showScheduleError('Please select both start and end date/time.');
+                return;
+            }
+
+            const start = new Date(oneOffData.start_datetime);
+            const end = new Date(oneOffData.end_datetime);
+            const diffMinutes = (end - start) / (1000 * 60);
+
+            if (diffMinutes <= 0) {
+                showScheduleError('End time must be after start time.');
+                return;
+            }
+            if (diffMinutes < 15) {
+                showScheduleError('Duration must be at least 15 minutes.');
+                return;
+            }
+            if (diffMinutes > 1440) {
+                showScheduleError('Duration cannot exceed 24 hours.');
+                return;
+            }
+            if (start <= new Date()) {
+                showScheduleError('Start time must be in the future.');
+                return;
+            }
+
+            payload.start_datetime = oneOffData.start_datetime;
+            payload.end_datetime = oneOffData.end_datetime;
+            payload.include_download = oneOffData.include_download;
+            payload.auto_increment_index = oneOffData.auto_increment_index;
+        } else {
+            showScheduleError('One-off editor not loaded properly.');
+            return;
+        }
     }
 
     try {

templates/roster.html

@@ -772,6 +772,8 @@
 
     // Handle Add Unit form submission
     document.getElementById('addUnitForm').addEventListener('htmx:afterRequest', function(event) {
+        // Only handle the form's own POST request, not child HTMX requests (e.g. project picker search)
+        if (event.detail.elt !== this) return;
         if (event.detail.successful) {
             closeAddUnitModal();
             refreshDeviceList();