{
    "success": true,
    "message": "清理完成：删除了 2 个已完成的任务，共 2565 条ProcessMessage记录",
    "deletedTasks": 2,
    "deletedMessages": 2565,
    "keepDays": 7,
    "cutoffDate": "2026-06-10 12:29:00"
}