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                "version": null,
                "confidence": "0.7200",
                "source_rule": "tailwind-v1",
                "evidence_keys": "[\"page.html\"]",
                "created_at": "2026-10-01 21:51:39",
                "updated_at": "2026-10-01 21:51:39"
            }
        ],
        "availability_history": [
            {
                "id": 15446,
                "status": "completed",
                "finished_at": "2026-10-01 21:51:40",
                "error_code": null,
                "status_code": 200,
                "final_url": "https://www.nationalacademies.org/",
                "duration_ms": 2000
            },
            {
                "id": 11162,
                "status": "completed",
                "finished_at": "2026-09-30 13:55:08",
                "error_code": null,
                "status_code": 200,
                "final_url": "https://www.nationalacademies.org/",
                "duration_ms": 1000
            }
        ],
        "comparison": {
            "previous": {
                "id": 11162,
                "finished_at": "2026-09-30 13:55:08",
                "status_code": 200,
                "final_url": "https://www.nationalacademies.org/",
                "safety_score": 65
            },
            "current": {
                "id": 15446,
                "finished_at": "2026-10-01 21:51:40",
                "status_code": 200,
                "final_url": "https://www.nationalacademies.org/",
                "safety_score": 65
            },
            "score_delta": 0,
            "added_technologies": [],
            "removed_technologies": []
        }
    },
    "limitations": [
        "This is a point-in-time technical evidence export.",
        "Unavailable checks are not clean results.",
        "The export is not a malware-removal guarantee or uptime SLA."
    ]
}