fix: improve maintenance and synchronize live conversations

backend/tests/api/test_roles.py

@@ -22,12 +22,12 @@ from fastapi import FastAPI
 from app.models.user import User
 from app.models.role import Role
 from app.models.permission import Permission, role_permissions
-from uuid import UUID, uuid4
+from uuid import uuid4
 from app.api import roles as roles_router
 from app.core.auth import get_current_user
 from app.main import app
 from app.core.config import settings
-from tests.conftest import engine, TestingSessionLocal, create_tables
+from tests.conftest import engine, TestingSessionLocal
 
 # Create a test FastAPI app
 app = FastAPI()