feat: fixed and improved search and background task management.

surfsense_backend/app/tasks/celery_tasks/document_tasks.py

@@ -36,11 +36,9 @@ def _get_doc_heartbeat_redis():
 
     global _doc_heartbeat_redis
     if _doc_heartbeat_redis is None:
-        redis_url = os.getenv(
-            "REDIS_APP_URL",
-            os.getenv("CELERY_BROKER_URL", "redis://localhost:6379/0"),
+        _doc_heartbeat_redis = redis.from_url(
+            config.REDIS_APP_URL, decode_responses=True
         )
-        _doc_heartbeat_redis = redis.from_url(redis_url, decode_responses=True)
     return _doc_heartbeat_redis
 
 
@@ -1104,4 +1102,4 @@ async def _process_circleback_meeting(
             if heartbeat_task:
                 heartbeat_task.cancel()
             if notification:
-                _stop_heartbeat(notification.id)
+                _stop_heartbeat(notification.id)

surfsense_backend/app/tasks/celery_tasks/podcast_tasks.py

@@ -46,16 +46,10 @@ def get_celery_session_maker():
 
 def _clear_generating_podcast(search_space_id: int) -> None:
     """Clear the generating podcast marker from Redis when task completes."""
-    import os
-
     import redis
 
     try:
-        redis_url = os.getenv(
-            "REDIS_APP_URL",
-            os.getenv("CELERY_BROKER_URL", "redis://localhost:6379/0"),
-        )
-        client = redis.from_url(redis_url, decode_responses=True)
+        client = redis.from_url(config.REDIS_APP_URL, decode_responses=True)
         key = f"podcast:generating:{search_space_id}"
         client.delete(key)
         logger.info(

surfsense_backend/app/tasks/celery_tasks/schedule_checker_task.py

@@ -9,7 +9,8 @@ from sqlalchemy.pool import NullPool
 
 from app.celery_app import celery_app
 from app.config import config
-from app.db import SearchSourceConnector, SearchSourceConnectorType
+from app.db import Notification, SearchSourceConnector, SearchSourceConnectorType
+from app.utils.indexing_locks import is_connector_indexing_locked
 
 logger = logging.getLogger(__name__)
 
@@ -107,6 +108,32 @@ async def _check_and_trigger_schedules():
 
             # Trigger indexing for each due connector
             for connector in due_connectors:
+                # Primary guard: Redis lock indicates a task is currently running.
+                if is_connector_indexing_locked(connector.id):
+                    logger.info(
+                        f"Skipping periodic indexing for connector {connector.id} "
+                        "(Redis lock indicates indexing is already in progress)"
+                    )
+                    continue
+
+                # Skip scheduling if a sync for this connector is already in progress.
+                # This prevents duplicate tasks from piling up under slow/rate-limited providers.
+                in_progress_result = await session.execute(
+                    select(Notification.id).where(
+                        Notification.type == "connector_indexing",
+                        Notification.notification_metadata["connector_id"].astext
+                        == str(connector.id),
+                        Notification.notification_metadata["status"].astext
+                        == "in_progress",
+                    )
+                )
+                if in_progress_result.first():
+                    logger.info(
+                        f"Skipping periodic indexing for connector {connector.id} "
+                        "(already has in-progress indexing notification)"
+                    )
+                    continue
+
                 task = task_map.get(connector.connector_type)
                 if task:
                     logger.info(

surfsense_backend/app/tasks/celery_tasks/stale_notification_cleanup_task.py

@@ -25,7 +25,6 @@ Detection mechanism:
 import contextlib
 import json
 import logging
-import os
 from datetime import UTC, datetime
 
 import redis
@@ -52,11 +51,7 @@ def get_redis_client() -> redis.Redis:
     """Get or create Redis client for heartbeat checking."""
     global _redis_client
     if _redis_client is None:
-        redis_url = os.getenv(
-            "REDIS_APP_URL",
-            os.getenv("CELERY_BROKER_URL", "redis://localhost:6379/0"),
-        )
-        _redis_client = redis.from_url(redis_url, decode_responses=True)
+        _redis_client = redis.from_url(config.REDIS_APP_URL, decode_responses=True)
     return _redis_client