fix: improve maintenance and synchronize live conversations

backend/tests/api/test_agent.py

@@ -22,10 +22,7 @@ from app.models.user import User, UserGroup
 from app.models.agent import Agent, AgentCustomization, AgentType
 from app.models.role import Role
 from app.models.permission import Permission, role_permissions
-from uuid import UUID, uuid4
-from datetime import datetime
-import os
-from typing import Dict, Generator
+from uuid import uuid4
 from app.api import agent as agent_router
 from app.core.auth import get_current_user, require_permissions, get_unified_auth
 from app.models.schemas.agent_customization import CustomizationCreate
@@ -705,7 +702,7 @@ def test_customization_response_signs_photo_url_without_persisting_it(
     instance, which SQLAlchemy then flushed, so stored URLs carried a signature
     that eventually expired.
     """
-    from unittest.mock import AsyncMock, patch, MagicMock
+    from unittest.mock import patch, MagicMock
 
     stored_url = "https://bucket.s3.us-east-1.amazonaws.com/agents/photo.png"
     signed_url = f"{stored_url}?AWSAccessKeyId=A&Signature=S&Expires=1"
@@ -1261,7 +1258,7 @@ def test_generate_instructions_ai_error(
         "existing_instructions": []
     }
     
-    from unittest.mock import patch, AsyncMock, MagicMock
+    from unittest.mock import patch, MagicMock
     
     # Create valid AI config mock
     mock_config = MagicMock()
@@ -1289,10 +1286,6 @@ def test_generate_instructions_rate_limiting(
     """Test rate limiting on instruction generation endpoint"""
     from unittest.mock import patch
     
-    prompt_data = {
-        "prompt": "Create helpful instructions",
-        "existing_instructions": []
-    }
     
     # Mock rate limiting decorator to raise exception
     with patch('app.utils.rate_limit.limit_instruction_generation') as mock_limit: