{
  "last_heartbeat_at": "2026-07-20T05:45:00+08:00",
  "status": "no_active_tasks",
  "active_tasks_count": 0,
  "p0_risks_count": 0,
  "p1p2_risks_count": 0,
  "note": "所有任务均为 done/cancelled，无活跃任务",
  "timestamp_utc": "2026-07-19T21:45:00Z"
}