Upload: communicate failure, minor frontend updates (#2048)

* (feat:pause-stream) generator exit

* (feat:pause-stream) close request

* (feat:pause-stream) finally close; google anthropic

* (feat:task_status)communicate failure

* (clean:connector) unused routes

* (feat:file-table) missing skeletons

* (fix:apiKeys) build err

---------

Co-authored-by: GH Action - Upstream Sync <action@github.com>

application/api/user/sources/upload.py

@@ -562,10 +562,21 @@ class TaskStatus(Resource):
             task = celery.AsyncResult(task_id)
             task_meta = task.info
             print(f"Task status: {task.status}")
+
+            if task.status == "PENDING":
+                inspect = celery.control.inspect()
+                active_workers = inspect.ping()
+                if not active_workers:
+                    raise ConnectionError("Service unavailable")
+
             if not isinstance(
                 task_meta, (dict, list, str, int, float, bool, type(None))
             ):
                 task_meta = str(task_meta)  # Convert to a string representation
+        except ConnectionError as err:
+            return make_response(
+                jsonify({"success": False, "message": str(err)}), 503
+            )
         except Exception as err:
             current_app.logger.error(f"Error getting task status: {err}", exc_info=True)
             return make_response(jsonify({"success": False}), 400)