fix: improve maintenance and synchronize live conversations

backend/tests/services/test_workflow_service.py

@@ -16,9 +16,9 @@ limitations under the License.
 
 import pytest
 import uuid
-from unittest.mock import MagicMock, patch
+from unittest.mock import MagicMock
 from app.services.workflow import WorkflowService
-from app.models.workflow import Workflow, WorkflowStatus
+from app.models.workflow import WorkflowStatus
 from app.models.schemas.workflow import WorkflowCreate