{
    "timestamp": "2026-09-14 12:30:26",
    "level": "INFO",
    "data": {
        "event": "job_started",
        "grading_id": 15
    }
}
{
    "timestamp": "2026-09-14 12:30:27",
    "level": "ERROR",
    "data": {
        "event": "process_failed",
        "grading_id": 15,
        "error": "Không tìm thấy binary dm."
    }
}
{
    "timestamp": "2026-09-14 12:30:27",
    "level": "ERROR",
    "data": {
        "event": "job_finished",
        "grading_id": 15,
        "status": "failed",
        "score": null
    }
}