backend/routers/projects.py

@@ -20,7 +20,7 @@ import json
 import logging
 import io
 
-from backend.utils.timezone import utc_to_local, format_local_datetime
+from backend.utils.timezone import utc_to_local, format_local_datetime, local_to_utc
 
 from backend.database import get_db
 from fastapi import UploadFile, File
@@ -1800,6 +1800,23 @@ async def delete_session(
 
 VALID_PERIOD_TYPES = {"weekday_day", "weekday_night", "weekend_day", "weekend_night"}
 
+
+def _derive_period_type(dt: datetime) -> str:
+    is_weekend = dt.weekday() >= 5
+    is_night = dt.hour >= 22 or dt.hour < 7
+    if is_weekend:
+        return "weekend_night" if is_night else "weekend_day"
+    return "weekday_night" if is_night else "weekday_day"
+
+
+def _build_session_label(dt: datetime, location_name: str, period_type: str) -> str:
+    day_abbr = dt.strftime("%a")
+    date_str = f"{dt.month}/{dt.day}"
+    period_str = {"weekday_day": "Day", "weekday_night": "Night", "weekend_day": "Day", "weekend_night": "Night"}.get(period_type, "")
+    parts = [p for p in [location_name, f"{day_abbr} {date_str}", period_str] if p]
+    return " — ".join(parts)
+
+
 @router.patch("/{project_id}/sessions/{session_id}")
 async def patch_session(
     project_id: str,
@@ -1807,13 +1824,53 @@ async def patch_session(
     data: dict,
     db: Session = Depends(get_db),
 ):
-    """Update session_label and/or period_type on a monitoring session."""
+    """Update session fields: started_at, stopped_at, session_label, period_type."""
     session = db.query(MonitoringSession).filter_by(id=session_id).first()
     if not session:
         raise HTTPException(status_code=404, detail="Session not found")
     if session.project_id != project_id:
         raise HTTPException(status_code=403, detail="Session does not belong to this project")
 
+    times_changed = False
+
+    if "started_at" in data and data["started_at"]:
+        try:
+            local_dt = datetime.fromisoformat(data["started_at"])
+            session.started_at = local_to_utc(local_dt)
+            times_changed = True
+        except ValueError:
+            raise HTTPException(status_code=400, detail="Invalid started_at datetime format")
+
+    if "stopped_at" in data:
+        if data["stopped_at"]:
+            try:
+                local_dt = datetime.fromisoformat(data["stopped_at"])
+                session.stopped_at = local_to_utc(local_dt)
+                times_changed = True
+            except ValueError:
+                raise HTTPException(status_code=400, detail="Invalid stopped_at datetime format")
+        else:
+            session.stopped_at = None
+            times_changed = True
+
+    if times_changed and session.started_at and session.stopped_at:
+        delta = session.stopped_at - session.started_at
+        session.duration_seconds = max(0, int(delta.total_seconds()))
+    elif times_changed and not session.stopped_at:
+        session.duration_seconds = None
+
+    # Re-derive period_type and session_label from new started_at unless explicitly provided
+    if times_changed and session.started_at and "period_type" not in data:
+        local_start = utc_to_local(session.started_at)
+        session.period_type = _derive_period_type(local_start)
+
+    if times_changed and session.started_at and "session_label" not in data:
+        from backend.models import MonitoringLocation
+        location = db.query(MonitoringLocation).filter_by(id=session.location_id).first()
+        location_name = location.name if location else ""
+        local_start = utc_to_local(session.started_at)
+        session.session_label = _build_session_label(local_start, location_name, session.period_type or "")
+
     if "session_label" in data:
         session.session_label = str(data["session_label"]).strip() or None
     if "period_type" in data:

templates/partials/projects/unified_files.html

@@ -56,6 +56,15 @@
                             {% else %}bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-300{% endif %}">
                             {{ session.status or 'unknown' }}
                         </span>
+                        <!-- Edit Session Times -->
+                        <button onclick="event.stopPropagation(); openEditSessionModal('{{ session.id }}', '{{ session.started_at|local_datetime if session.started_at else '' }}', '{{ session.stopped_at|local_datetime if session.stopped_at else '' }}')"
+                                class="px-3 py-1 text-xs bg-gray-600 text-white rounded-lg hover:bg-gray-700 transition-colors flex items-center gap-1"
+                                title="Edit session times">
+                            <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>
+                            Edit
+                        </button>
                         <!-- Download All Files in Session -->
                         <button onclick="event.stopPropagation(); downloadSessionFiles('{{ session.id }}')"
                                 class="px-3 py-1 text-xs bg-seismo-orange text-white rounded-lg hover:bg-seismo-navy transition-colors flex items-center gap-1"
@@ -326,4 +335,74 @@ async function deleteSession(sessionId) {
         alert(`Error deleting session: ${error.message}`);
     }
 }
+
+function openEditSessionModal(sessionId, startedAt, stoppedAt) {
+    document.getElementById('editSessionId').value = sessionId;
+    // local_datetime filter returns "YYYY-MM-DD HH:MM" — convert to "YYYY-MM-DDTHH:MM" for datetime-local input
+    document.getElementById('editStartedAt').value = startedAt ? startedAt.replace(' ', 'T') : '';
+    document.getElementById('editStoppedAt').value = stoppedAt ? stoppedAt.replace(' ', 'T') : '';
+    document.getElementById('editSessionModal').classList.remove('hidden');
+}
+
+function closeEditSessionModal() {
+    document.getElementById('editSessionModal').classList.add('hidden');
+}
+
+async function saveSessionTimes() {
+    const sessionId = document.getElementById('editSessionId').value;
+    const startedAt = document.getElementById('editStartedAt').value;
+    const stoppedAt = document.getElementById('editStoppedAt').value;
+
+    try {
+        const response = await fetch(`/api/projects/{{ project_id }}/sessions/${sessionId}`, {
+            method: 'PATCH',
+            headers: {'Content-Type': 'application/json'},
+            body: JSON.stringify({
+                started_at: startedAt || null,
+                stopped_at: stoppedAt || null,
+            })
+        });
+
+        if (response.ok) {
+            closeEditSessionModal();
+            window.location.reload();
+        } else {
+            const data = await response.json();
+            alert(`Failed to update session: ${data.detail || 'Unknown error'}`);
+        }
+    } catch (error) {
+        alert(`Error updating session: ${error.message}`);
+    }
+}
 </script>
+
+<!-- Edit Session Times Modal -->
+<div id="editSessionModal" class="hidden fixed inset-0 z-50 flex items-center justify-center bg-black/50">
+    <div class="bg-white dark:bg-gray-800 rounded-xl shadow-xl p-6 w-full max-w-sm mx-4">
+        <h3 class="text-lg font-semibold text-gray-900 dark:text-white mb-4">Edit Session Times</h3>
+        <input type="hidden" id="editSessionId">
+        <div class="space-y-4">
+            <div>
+                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Start Time</label>
+                <input type="datetime-local" id="editStartedAt"
+                       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 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500">
+            </div>
+            <div>
+                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Stop Time</label>
+                <input type="datetime-local" id="editStoppedAt"
+                       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 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500">
+            </div>
+        </div>
+        <p class="mt-3 text-xs text-gray-500 dark:text-gray-400">Times are in your local timezone. The session label and period type will be updated automatically.</p>
+        <div class="flex justify-end gap-3 mt-5">
+            <button onclick="closeEditSessionModal()"
+                    class="px-4 py-2 text-sm text-gray-700 dark:text-gray-300 bg-gray-100 dark:bg-gray-700 rounded-lg hover:bg-gray-200 dark:hover:bg-gray-600 transition-colors">
+                Cancel
+            </button>
+            <button onclick="saveSessionTimes()"
+                    class="px-4 py-2 text-sm text-white bg-blue-600 rounded-lg hover:bg-blue-700 transition-colors">
+                Save
+            </button>
+        </div>
+    </div>
+</div>