fix: improve maintenance and synchronize live conversations

backend/tests/service/test_firebase.py

@@ -16,9 +16,8 @@ limitations under the License.
 
 import pytest
 from firebase_admin import credentials
-from unittest.mock import patch, MagicMock, call, create_autospec
+from unittest.mock import patch, MagicMock, call
 from app.services.firebase import initialize_firebase
-import os
 
 @pytest.fixture(autouse=True)
 def mock_logger():