fix: improve maintenance and synchronize live conversations

backend/tests/services/test_channel_chat.py

@@ -16,7 +16,6 @@ limitations under the License.
 
 from types import SimpleNamespace
 from unittest.mock import AsyncMock, MagicMock, patch
-from uuid import uuid4
 
 import pytest
 
@@ -28,7 +27,6 @@ from app.models.agent import AgentType
 from app.models.session_to_agent import SessionToAgent, SessionStatus
 from app.repositories.channels import (
     ChannelAccountRepository,
-    ChannelConversationRepository,
     AgentChannelConfigRepository,
 )
 from app.repositories.agent import AgentRepository