fix: improve maintenance and synchronize live conversations

backend/tests/services/test_ticket_csat.py

@@ -23,7 +23,7 @@ import pytest
 from app.models.chat_history import ChatHistory
 from app.models.rating import Rating
 from app.models.session_to_agent import SessionStatus, SessionToAgent
-from app.models.ticket import Ticket, TicketPriority, TicketSource, TicketStatus
+from app.models.ticket import Ticket, TicketPriority, TicketSource
 from app.models.ticket_activity import TicketActivityType, TicketActorType
 from app.repositories.rating import RatingRepository
 from app.services.ticket import TicketService