{
  "code": 200,
  "data": {
    "sites": [
      {
        "id": "demo-site",
        "name": "示範站點",
        "devices": [
          {
            "id": "demo-device-01",
            "hardwareId": "DEMO-01",
            "name": "示範加速度計 A",
            "status": "normal",
            "currentValue": {
              "ax": 0.01,
              "ay": -0.02,
              "az": 0.03
            },
            "lastMeasurementAt": "2026-10-15T01:00:00.000Z"
          },
          {
            "id": "demo-device-02",
            "hardwareId": "DEMO-02",
            "name": "示範加速度計 B",
            "status": "offline",
            "currentValue": null,
            "lastMeasurementAt": null
          }
        ]
      }
    ]
  }
}