fix: critical timestamp parsing and audit fixes

- Fix timestamp conversion: String(epochMs) → new Date(epochMs).toISOString()
  in use-messages-sync, use-comments-sync, use-documents, use-inbox.
  Without this, date comparisons (isEdited, cutoff filters) would fail.
- Fix updated_at: undefined → null in use-inbox to match InboxItem type
- Fix ZeroProvider: skip Zero connection for unauthenticated users
- Clean 30+ stale "Electric SQL" comments in backend Python code

surfsense_backend/app/routes/__init__.py

@@ -80,7 +80,7 @@ router.include_router(model_list_router)  # Dynamic LLM model catalogue from Ope
 router.include_router(logs_router)
 router.include_router(circleback_webhook_router)  # Circleback meeting webhooks
 router.include_router(surfsense_docs_router)  # Surfsense documentation for citations
-router.include_router(notifications_router)  # Notifications with Electric SQL sync
+router.include_router(notifications_router)  # Notifications with Zero sync
 router.include_router(composio_router)  # Composio OAuth and toolkit management
 router.include_router(public_chat_router)  # Public chat sharing and cloning
 router.include_router(incentive_tasks_router)  # Incentive tasks for earning free pages

surfsense_backend/app/routes/documents_routes.py

@@ -128,7 +128,7 @@ async def create_documents_file_upload(
     Upload files as documents with real-time status tracking.
 
     Implements 2-phase document status updates for real-time UI feedback:
-    - Phase 1: Create all documents with 'pending' status (visible in UI immediately via ElectricSQL)
+    - Phase 1: Create all documents with 'pending' status (visible in UI immediately via Zero)
     - Phase 2: Celery processes each file: pending → processing → ready/failed
 
     Requires DOCUMENTS_CREATE permission.

surfsense_backend/app/routes/notifications_routes.py

@@ -1,7 +1,7 @@
 """
 Notifications API routes.
 These endpoints allow marking notifications as read and fetching older notifications.
-Electric SQL automatically syncs the changes to all connected clients for recent items.
+Zero automatically syncs the changes to all connected clients for recent items.
 For older items (beyond the sync window), use the list endpoint.
 """
 
@@ -267,7 +267,7 @@ async def get_unread_count(
 
     This allows the frontend to calculate:
     - older_unread = total_unread - recent_unread (static until reconciliation)
-    - Display count = older_unread + live_recent_count (from Electric SQL)
+    - Display count = older_unread + live_recent_count (from Zero)
     """
     # Calculate cutoff date for sync window
     cutoff_date = datetime.now(UTC) - timedelta(days=SYNC_WINDOW_DAYS)
@@ -344,7 +344,7 @@ async def list_notifications(
     List notifications for the current user with pagination.
 
     This endpoint is used as a fallback for older notifications that are
-    outside the Electric SQL sync window (2 weeks).
+    outside the Zero sync window (2 weeks).
 
     Use `before_date` to paginate through older notifications efficiently.
     """
@@ -487,7 +487,7 @@ async def mark_notification_as_read(
     """
     Mark a single notification as read.
 
-    Electric SQL will automatically sync this change to all connected clients.
+    Zero will automatically sync this change to all connected clients.
     """
     # Verify the notification belongs to the user
     result = await session.execute(
@@ -528,7 +528,7 @@ async def mark_all_notifications_as_read(
     """
     Mark all notifications as read for the current user.
 
-    Electric SQL will automatically sync these changes to all connected clients.
+    Zero will automatically sync these changes to all connected clients.
     """
     # Update all unread notifications for the user
     result = await session.execute(

surfsense_backend/app/routes/search_source_connectors_routes.py

@@ -1433,7 +1433,7 @@ async def _run_indexing_with_notifications(
                 )
                 await (
                     session.commit()
-                )  # Commit to ensure Electric SQL syncs the notification update
+                )  # Commit to ensure Zero syncs the notification update
         elif documents_processed > 0:
             # Update notification to storing stage
             if notification:
@@ -1460,7 +1460,7 @@ async def _run_indexing_with_notifications(
                 )
                 await (
                     session.commit()
-                )  # Commit to ensure Electric SQL syncs the notification update
+                )  # Commit to ensure Zero syncs the notification update
         else:
             # No new documents processed - check if this is an error or just no changes
             if error_or_warning:
@@ -1486,7 +1486,7 @@ async def _run_indexing_with_notifications(
                 if is_duplicate_warning or is_empty_result or is_info_warning:
                     # These are success cases - sync worked, just found nothing new
                     logger.info(f"Indexing completed successfully: {error_or_warning}")
-                    # Still update timestamp so ElectricSQL syncs and clears "Syncing" UI
+                    # Still update timestamp so Zero syncs and clears "Syncing" UI
                     if update_timestamp_func:
                         await update_timestamp_func(session, connector_id)
                         await session.commit()  # Commit timestamp update
@@ -1509,7 +1509,7 @@ async def _run_indexing_with_notifications(
                         )
                         await (
                             session.commit()
-                        )  # Commit to ensure Electric SQL syncs the notification update
+                        )  # Commit to ensure Zero syncs the notification update
                 else:
                     # Actual failure
                     logger.error(f"Indexing failed: {error_or_warning}")
@@ -1525,13 +1525,13 @@ async def _run_indexing_with_notifications(
                         )
                         await (
                             session.commit()
-                        )  # Commit to ensure Electric SQL syncs the notification update
+                        )  # Commit to ensure Zero syncs the notification update
             else:
                 # Success - just no new documents to index (all skipped/unchanged)
                 logger.info(
                     "Indexing completed: No new documents to process (all up to date)"
                 )
-                # Still update timestamp so ElectricSQL syncs and clears "Syncing" UI
+                # Still update timestamp so Zero syncs and clears "Syncing" UI
                 if update_timestamp_func:
                     await update_timestamp_func(session, connector_id)
                     await session.commit()  # Commit timestamp update
@@ -1547,7 +1547,7 @@ async def _run_indexing_with_notifications(
                     )
                     await (
                         session.commit()
-                    )  # Commit to ensure Electric SQL syncs the notification update
+                    )  # Commit to ensure Zero syncs the notification update
     except SoftTimeLimitExceeded:
         # Celery soft time limit was reached - task is about to be killed
         # Gracefully save progress and mark as interrupted
@@ -2650,7 +2650,7 @@ async def run_composio_indexing(
     Run Composio connector indexing with real-time notifications.
 
     This wraps the Composio indexer with the notification system so that
-    Electric SQL can sync indexing progress to the frontend in real-time.
+    Zero can sync indexing progress to the frontend in real-time.
 
     Args:
         session: Database session