fix: improve maintenance and synchronize live conversations

backend/tests/core/test_s3.py

@@ -17,9 +17,8 @@ limitations under the License.
 import os
 
 import pytest
-from unittest.mock import patch, MagicMock, AsyncMock
-from fastapi import UploadFile, HTTPException
-from io import BytesIO
+from unittest.mock import patch, MagicMock
+from fastapi import HTTPException
 from app.core.s3 import (
     S3_MAX_PRESIGN_SECONDS,
     delete_file_from_s3,