Fix test case and deprecation warning in IndexSyncAgent

Co-authored-by: Mte90 <403283+Mte90@users.noreply.github.com>

Author: Copilot

ai/agents/index_sync_agent.py

@@ -8,7 +8,7 @@
 
 import threading
 import time
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional, Callable
 import os
 
@@ -230,7 +230,7 @@ def _reconcile_project(self, project: Dict[str, Any]) -> None:
 
             metadata = {}
             if actual_status == "ready":
-                metadata["last_indexed_at"] = datetime.utcnow().isoformat()
+                metadata["last_indexed_at"] = datetime.now(timezone.utc).isoformat()
 
             self._update_project_status(
                 project_id,

tests/test_index_sync_agent.py

@@ -139,6 +139,9 @@ def test_agent_reconcile_indexed_project(self):
         """Test reconciliation of fully indexed project."""
         db_path = os.path.join(self.temp_dir, "indexed.db")
 
+        # Create a dummy database file so it "exists"
+        open(db_path, 'w').close()
+        
         self.mock_db.projects = [{
             "id": "test456",
             "path": self.temp_dir,