diff --git a/src/daemon/spawner.py b/src/daemon/spawner.py
index f698ec9..6b7520c 100644
--- a/src/daemon/spawner.py
+++ b/src/daemon/spawner.py
@@ -1532,7 +1532,7 @@ curl -X POST http://{api_host}:{api_port}/api/projects/{project_id}/tasks/{task_
             return False
 
         try:
-            from datetime import datetime as _dt, timezone as _tz, timedelta
+            from datetime import datetime as _dt, timezone as _tz
 
             # 读尾部 500KB
             with open(traj_path, "rb") as f: