diff --git a/src/daemon/ticker.py b/src/daemon/ticker.py
index 11096f2..3b605aa 100644
--- a/src/daemon/ticker.py
+++ b/src/daemon/ticker.py
@@ -402,7 +402,7 @@ class Ticker:
         """检查 claimed/working 超时的任务"""
         queries = Queries(db_path)
         reclaimed: List[str] = []
-        now = datetime.utcnow()
+        now = datetime.utcnow()  # UTC，与 SQLite datetime('now') 一致
 
         # claimed 超时 → 重置为 pending
         claimed = queries.tasks_by_status("claimed")