refac: robust file upload failed handling

backend/open_webui/models/files.py

@@ -130,6 +130,17 @@ class FilesTable:
             except Exception:
                 return None
 
+    def get_file_by_id_and_user_id(self, id: str, user_id: str) -> Optional[FileModel]:
+        with get_db() as db:
+            try:
+                file = db.query(File).filter_by(id=id, user_id=user_id).first()
+                if file:
+                    return FileModel.model_validate(file)
+                else:
+                    return None
+            except Exception:
+                return None
+
     def get_file_metadata_by_id(self, id: str) -> Optional[FileMetadataResponse]:
         with get_db() as db:
             try: