feat: adds deployment records for seismographs.

backend/main.py

@@ -126,6 +126,10 @@ app.include_router(recurring_schedules.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

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/models.py

@@ -448,6 +448,41 @@ class Alert(Base):
     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
 # ============================================================================

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/roster_edit.py

@@ -9,7 +9,8 @@ import httpx
 import os
 
 from backend.database import get_db
-from backend.models import RosterUnit, IgnoredUnit, Emitter, UnitHistory, UserPreferences
+from backend.models import RosterUnit, IgnoredUnit, Emitter, UnitHistory, UserPreferences, DeploymentRecord
+import uuid
 from backend.services.slmm_sync import sync_slm_to_slmm
 
 router = APIRouter(prefix="/api/roster", tags=["roster-edit"])
@@ -27,6 +28,38 @@ def get_calibration_interval(db: Session) -> int:
 SLMM_BASE_URL = os.getenv("SLMM_BASE_URL", "http://localhost:8100")
 
 
+def sync_deployment_record(db: Session, unit: RosterUnit, new_deployed: bool):
+    """
+    Keep DeploymentRecord in sync with the deployed flag.
+
+    deployed True  → open a new DeploymentRecord if none is already open.
+    deployed False → close the active DeploymentRecord by setting actual_removal_date = today.
+    """
+    if new_deployed:
+        existing = db.query(DeploymentRecord).filter(
+            DeploymentRecord.unit_id == unit.id,
+            DeploymentRecord.actual_removal_date == None
+        ).first()
+        if not existing:
+            record = DeploymentRecord(
+                id=str(uuid.uuid4()),
+                unit_id=unit.id,
+                project_ref=unit.project_id or None,
+                deployed_date=date.today(),
+                created_at=datetime.utcnow(),
+                updated_at=datetime.utcnow(),
+            )
+            db.add(record)
+    else:
+        active = db.query(DeploymentRecord).filter(
+            DeploymentRecord.unit_id == unit.id,
+            DeploymentRecord.actual_removal_date == None
+        ).first()
+        if active:
+            active.actual_removal_date = date.today()
+            active.updated_at = datetime.utcnow()
+
+
 def record_history(db: Session, unit_id: str, change_type: str, field_name: str = None,
                    old_value: str = None, new_value: str = None, source: str = "manual", notes: str = None):
     """Helper function to record a change in unit history"""
@@ -679,6 +712,7 @@ async def edit_roster_unit(
         status_text = "deployed" if deployed else "benched"
         old_status_text = "deployed" if old_deployed else "benched"
         record_history(db, unit_id, "deployed_change", "deployed", old_status_text, status_text, "manual")
+        sync_deployment_record(db, unit, deployed_bool)
 
     if old_retired != retired:
         status_text = "retired" if retired else "active"
@@ -795,6 +829,7 @@ async def set_deployed(unit_id: str, deployed: bool = Form(...), db: Session = D
             new_value=status_text,
             source="manual"
         )
+        sync_deployment_record(db, unit, deployed)
 
     db.commit()
 

backend/services/fleet_calendar_service.py

@@ -15,7 +15,7 @@ from sqlalchemy import and_, or_
 
 from backend.models import (
     RosterUnit, JobReservation, JobReservationUnit,
-    UserPreferences, Project
+    UserPreferences, Project, DeploymentRecord
 )
 
 
@@ -70,6 +70,19 @@ def get_unit_reservations_on_date(
     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,
@@ -82,8 +95,8 @@ def is_unit_available_on_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"
+        - status: "available", "reserved", "expired", "retired", "needs_calibration", "in_field"
-        - reservation_name: Name of blocking reservation (if any)
+        - reservation_name: Name of blocking reservation or project ref (if any)
     """
     # Check if retired
     if unit.retired:
@@ -96,6 +109,12 @@ def is_unit_available_on_date(
     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:
@@ -136,6 +155,7 @@ def get_day_summary(
     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:
@@ -167,6 +187,9 @@ def get_day_summary(
             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)
@@ -207,6 +230,7 @@ def get_day_summary(
         "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,
@@ -215,6 +239,7 @@ def get_day_summary(
         "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),
@@ -285,6 +310,14 @@ def get_calendar_year_data(
                 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 = {}
 
@@ -301,6 +334,7 @@ def get_calendar_year_data(
 
         while current_day <= last_day:
             available = 0
+            in_field = 0
             reserved = 0
             expired = 0
             expiring_soon = 0
@@ -328,6 +362,11 @@ def get_calendar_year_data(
                     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:
@@ -346,6 +385,7 @@ def get_calendar_year_data(
 
             days_data[current_day.day] = {
                 "available": available,
+                "in_field": in_field,
                 "reserved": reserved,
                 "expired": expired,
                 "expiring_soon": expiring_soon,
@@ -462,6 +502,14 @@ def get_rolling_calendar_data(
                 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
@@ -640,11 +688,22 @@ def get_available_units_for_period(
         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)

templates/unit_detail.html

@@ -278,6 +278,22 @@
                 <p id="viewNote" class="mt-1 text-gray-900 dark:text-white whitespace-pre-wrap">--</p>
             </div>
 
+            <!-- Deployment History -->
+            <div class="border-t border-gray-200 dark:border-gray-700 pt-6">
+                <div class="flex justify-between items-center mb-4">
+                    <h3 class="text-lg font-semibold text-gray-900 dark:text-white">Deployment History</h3>
+                    <button onclick="openNewDeploymentModal()" class="px-3 py-1.5 bg-seismo-orange hover:bg-orange-600 text-white rounded-lg text-sm transition-colors flex items-center gap-1.5">
+                        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4"></path>
+                        </svg>
+                        Log Deployment
+                    </button>
+                </div>
+                <div id="deploymentHistory" class="space-y-3">
+                    <p class="text-sm text-gray-500 dark:text-gray-400">Loading...</p>
+                </div>
+            </div>
+
             <!-- Unit History Timeline -->
             <div class="border-t border-gray-200 dark:border-gray-700 pt-6">
                 <h3 class="text-lg font-semibold text-gray-900 dark:text-white mb-4">Timeline</h3>
@@ -320,6 +336,53 @@
         </div>
     </div>
 
+    <!-- Deployment Modal -->
+    <div id="deploymentModal" class="hidden fixed inset-0 bg-black/50 z-50 flex items-center justify-center p-4">
+        <div class="bg-white dark:bg-slate-800 rounded-xl shadow-2xl w-full max-w-lg">
+            <div class="flex justify-between items-center p-6 border-b border-gray-200 dark:border-gray-700">
+                <h3 id="deploymentModalTitle" class="text-lg font-semibold text-gray-900 dark:text-white">Log Deployment</h3>
+                <button onclick="closeDeploymentModal()" class="text-gray-400 hover:text-gray-600 dark:hover:text-gray-300">
+                    <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"></path>
+                    </svg>
+                </button>
+            </div>
+            <div class="p-6 space-y-4">
+                <input type="hidden" id="deploymentModalId">
+                <div class="grid grid-cols-2 gap-4">
+                    <div>
+                        <label class="text-sm font-medium text-gray-700 dark:text-gray-300">Deployed Date</label>
+                        <input type="date" id="deploymentDeployedDate" class="mt-1 w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-slate-700 text-gray-900 dark:text-white text-sm focus:ring-2 focus:ring-seismo-orange">
+                    </div>
+                    <div>
+                        <label class="text-sm font-medium text-gray-700 dark:text-gray-300">Est. Removal Date</label>
+                        <input type="date" id="deploymentEstRemovalDate" class="mt-1 w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-slate-700 text-gray-900 dark:text-white text-sm focus:ring-2 focus:ring-seismo-orange">
+                    </div>
+                </div>
+                <div id="actualRemovalRow">
+                    <label class="text-sm font-medium text-gray-700 dark:text-gray-300">Actual Removal Date <span class="text-gray-400 font-normal">(fill when returned)</span></label>
+                    <input type="date" id="deploymentActualRemovalDate" class="mt-1 w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-slate-700 text-gray-900 dark:text-white text-sm focus:ring-2 focus:ring-seismo-orange">
+                </div>
+                <div>
+                    <label class="text-sm font-medium text-gray-700 dark:text-gray-300">Job / Project</label>
+                    <input type="text" id="deploymentProjectRef" placeholder="e.g. Fay I-80, CMU Campus" class="mt-1 w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-slate-700 text-gray-900 dark:text-white text-sm focus:ring-2 focus:ring-seismo-orange">
+                </div>
+                <div>
+                    <label class="text-sm font-medium text-gray-700 dark:text-gray-300">Location Name</label>
+                    <input type="text" id="deploymentLocationName" placeholder="e.g. North Gate, VP-001" class="mt-1 w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-slate-700 text-gray-900 dark:text-white text-sm focus:ring-2 focus:ring-seismo-orange">
+                </div>
+                <div>
+                    <label class="text-sm font-medium text-gray-700 dark:text-gray-300">Notes</label>
+                    <textarea id="deploymentNotes" rows="2" class="mt-1 w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-slate-700 text-gray-900 dark:text-white text-sm focus:ring-2 focus:ring-seismo-orange resize-none"></textarea>
+                </div>
+            </div>
+            <div class="flex justify-end gap-3 p-6 border-t border-gray-200 dark:border-gray-700">
+                <button onclick="closeDeploymentModal()" class="px-4 py-2 text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-slate-700 rounded-lg text-sm transition-colors">Cancel</button>
+                <button onclick="saveDeployment()" class="px-4 py-2 bg-seismo-orange hover:bg-orange-600 text-white rounded-lg text-sm transition-colors">Save</button>
+            </div>
+        </div>
+    </div>
+
     <!-- Edit Mode: Unit Information Form (Hidden by default) -->
     <div id="editMode" class="hidden rounded-xl shadow-lg bg-white dark:bg-slate-800 p-6">
         <div class="flex justify-between items-center mb-6">
@@ -1631,12 +1694,173 @@ async function pingModem() {
     btn.disabled = false;
 }
 
+// ============================================================
+// Deployment History
+// ============================================================
+
+async function loadDeploymentHistory() {
+    try {
+        const res = await fetch(`/api/deployments/${unitId}`);
+        const data = await res.json();
+        const container = document.getElementById('deploymentHistory');
+        const deployments = data.deployments || [];
+
+        if (deployments.length === 0) {
+            container.innerHTML = '<p class="text-sm text-gray-500 dark:text-gray-400">No deployment records yet.</p>';
+            return;
+        }
+
+        container.innerHTML = '';
+        deployments.forEach(d => {
+            container.appendChild(createDeploymentRow(d));
+        });
+    } catch (e) {
+        document.getElementById('deploymentHistory').innerHTML =
+            '<p class="text-sm text-red-500">Failed to load deployment history.</p>';
+    }
+}
+
+function formatDateDisplay(iso) {
+    if (!iso) return '—';
+    const [y, m, d] = iso.split('-');
+    return `${parseInt(m)}/${parseInt(d)}/${y}`;
+}
+
+function createDeploymentRow(d) {
+    const div = document.createElement('div');
+    div.className = 'flex items-start gap-3 p-3 rounded-lg ' +
+        (d.is_active
+            ? 'bg-green-50 dark:bg-green-900/20 border border-green-200 dark:border-green-800'
+            : 'bg-gray-50 dark:bg-slate-700/50');
+
+    const statusDot = d.is_active
+        ? '<span class="mt-1 flex-shrink-0 w-2.5 h-2.5 rounded-full bg-green-500"></span>'
+        : '<span class="mt-1 flex-shrink-0 w-2.5 h-2.5 rounded-full bg-gray-400 dark:bg-gray-500"></span>';
+
+    const jobLabel = d.project_ref || d.project_id || 'Unspecified job';
+    const locLabel = d.location_name ? `<span class="text-gray-500 dark:text-gray-400"> · ${d.location_name}</span>` : '';
+
+    const deployedStr = formatDateDisplay(d.deployed_date);
+    const estStr = d.estimated_removal_date ? formatDateDisplay(d.estimated_removal_date) : 'TBD';
+    const actualStr = d.actual_removal_date ? formatDateDisplay(d.actual_removal_date) : null;
+
+    const dateRange = actualStr
+        ? `${deployedStr} → ${actualStr}`
+        : `${deployedStr} → <span class="font-medium ${d.is_active ? 'text-green-700 dark:text-green-400' : 'text-gray-600 dark:text-gray-300'}">Est. ${estStr}</span>`;
+
+    const activeTag = d.is_active
+        ? '<span class="ml-2 px-1.5 py-0.5 text-xs font-medium bg-green-100 dark:bg-green-900/40 text-green-700 dark:text-green-400 rounded">In Field</span>'
+        : '';
+
+    div.innerHTML = `
+        ${statusDot}
+        <div class="flex-1 min-w-0">
+            <div class="text-sm font-medium text-gray-900 dark:text-white">
+                ${jobLabel}${activeTag}${locLabel}
+            </div>
+            <div class="text-xs text-gray-500 dark:text-gray-400 mt-0.5">${dateRange}</div>
+            ${d.notes ? `<div class="text-xs text-gray-500 dark:text-gray-400 mt-0.5 italic">${d.notes}</div>` : ''}
+        </div>
+        <div class="flex gap-1 flex-shrink-0">
+            <button onclick="openEditDeploymentModal(${JSON.stringify(d).replace(/"/g, '&quot;')})"
+                class="p-1.5 text-gray-400 hover:text-seismo-orange rounded transition-colors" title="Edit">
+                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+                        d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path>
+                </svg>
+            </button>
+            <button onclick="deleteDeployment('${d.id}')"
+                class="p-1.5 text-gray-400 hover:text-red-500 rounded transition-colors" title="Delete">
+                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+                        d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
+                </svg>
+            </button>
+        </div>
+    `;
+    return div;
+}
+
+function openNewDeploymentModal() {
+    document.getElementById('deploymentModalTitle').textContent = 'Log Deployment';
+    document.getElementById('deploymentModalId').value = '';
+    document.getElementById('deploymentDeployedDate').value = '';
+    document.getElementById('deploymentEstRemovalDate').value = '';
+    document.getElementById('deploymentActualRemovalDate').value = '';
+    document.getElementById('deploymentProjectRef').value = '';
+    document.getElementById('deploymentLocationName').value = '';
+    document.getElementById('deploymentNotes').value = '';
+    document.getElementById('deploymentModal').classList.remove('hidden');
+}
+
+function openEditDeploymentModal(d) {
+    document.getElementById('deploymentModalTitle').textContent = 'Edit Deployment';
+    document.getElementById('deploymentModalId').value = d.id;
+    document.getElementById('deploymentDeployedDate').value = d.deployed_date || '';
+    document.getElementById('deploymentEstRemovalDate').value = d.estimated_removal_date || '';
+    document.getElementById('deploymentActualRemovalDate').value = d.actual_removal_date || '';
+    document.getElementById('deploymentProjectRef').value = d.project_ref || '';
+    document.getElementById('deploymentLocationName').value = d.location_name || '';
+    document.getElementById('deploymentNotes').value = d.notes || '';
+    document.getElementById('deploymentModal').classList.remove('hidden');
+}
+
+function closeDeploymentModal() {
+    document.getElementById('deploymentModal').classList.add('hidden');
+}
+
+async function saveDeployment() {
+    const id = document.getElementById('deploymentModalId').value;
+    const payload = {
+        deployed_date: document.getElementById('deploymentDeployedDate').value || null,
+        estimated_removal_date: document.getElementById('deploymentEstRemovalDate').value || null,
+        actual_removal_date: document.getElementById('deploymentActualRemovalDate').value || null,
+        project_ref: document.getElementById('deploymentProjectRef').value || null,
+        location_name: document.getElementById('deploymentLocationName').value || null,
+        notes: document.getElementById('deploymentNotes').value || null,
+    };
+
+    try {
+        let res;
+        if (id) {
+            res = await fetch(`/api/deployments/${unitId}/${id}`, {
+                method: 'PUT',
+                headers: {'Content-Type': 'application/json'},
+                body: JSON.stringify(payload)
+            });
+        } else {
+            res = await fetch(`/api/deployments/${unitId}`, {
+                method: 'POST',
+                headers: {'Content-Type': 'application/json'},
+                body: JSON.stringify(payload)
+            });
+        }
+        if (!res.ok) throw new Error(await res.text());
+        closeDeploymentModal();
+        loadDeploymentHistory();
+    } catch (e) {
+        alert('Failed to save deployment: ' + e.message);
+    }
+}
+
+async function deleteDeployment(deploymentId) {
+    if (!confirm('Delete this deployment record?')) return;
+    try {
+        const res = await fetch(`/api/deployments/${unitId}/${deploymentId}`, { method: 'DELETE' });
+        if (!res.ok) throw new Error(await res.text());
+        loadDeploymentHistory();
+    } catch (e) {
+        alert('Failed to delete: ' + e.message);
+    }
+}
+
 // Load data when page loads
 loadCalibrationInterval();
 setupCalibrationAutoCalc();
 loadUnitData().then(() => {
     loadPhotos();
     loadUnitHistory();
+    loadDeploymentHistory();
 });
 
 // ===== Pair Device Modal Functions =====