fix(db): release connection before embedding in process_files_batch (#20576)

Remove Depends(get_session) from POST /process/files/batch endpoint to prevent database connections from being held during batch embedding API calls (5-60+ seconds for large batches).

The save_docs_to_vector_db() function makes external embedding API calls. Post-embedding file updates (Files.update_file_by_id) manage their own short-lived sessions internally, releasing connections promptly.

backend/open_webui/routers/retrieval.py

@@ -2626,10 +2626,14 @@ async def process_files_batch(
     request: Request,
     form_data: BatchProcessFilesForm,
     user=Depends(get_verified_user),
-    db: Session = Depends(get_session),
 ) -> BatchProcessFilesResponse:
     """
     Process a batch of files and save them to the vector database.
+
+    NOTE: We intentionally do NOT use Depends(get_session) here.
+    The save_docs_to_vector_db() call makes external embedding API calls which
+    can take 5-60+ seconds for batch operations. Database operations after
+    embedding (Files.update_file_by_id) manage their own short-lived sessions.
     """
 
     collection_name = form_data.collection_name
@@ -2690,7 +2694,7 @@ async def process_files_batch(
             # Update all files with collection name
             for file_update, file_result in zip(file_updates, file_results):
                 Files.update_file_by_id(
-                    id=file_result.file_id, form_data=file_update, db=db
+                    id=file_result.file_id, form_data=file_update
                 )
                 file_result.status = "completed"