fix: remove unused imports

Author: dori

src/mcp_as_a_judge/db/cleanup_service.py

@@ -5,7 +5,7 @@
 removing least recently used sessions when session limits are exceeded.
 """
 
-from datetime import UTC, datetime
+
 
 from sqlalchemy import Engine, func
 from sqlmodel import Session, select

tests/test_conversation_history_lifecycle.py

@@ -5,7 +5,7 @@
 """
 
 import asyncio
-from datetime import UTC, datetime, timedelta
+
 
 import pytest