[
  {
    "device_id": "XR-03",
    "reported_at": "2026-10-06T13:19:00+09:00",
    "battery_pct": 96,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-03",
    "reported_at": "2026-10-06T13:48:00+09:00",
    "battery_pct": 90,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-03",
    "reported_at": "2026-10-06T13:49:00+09:00",
    "battery_pct": null,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-07",
    "reported_at": "2026-10-06T13:19:00+09:00",
    "battery_pct": 49,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-07",
    "reported_at": "2026-10-06T13:49:00+09:00",
    "battery_pct": 31,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-12",
    "reported_at": "2026-10-06T13:19:00+09:00",
    "battery_pct": 92,
    "content_version": "v2.3.1"
  },
  {
    "device_id": "XR-12",
    "reported_at": "2026-10-06T13:49:00+09:00",
    "battery_pct": 87,
    "content_version": "v2.3.1"
  },
  {
    "device_id": "XR-15",
    "reported_at": "2026-10-06T13:20:00+09:00",
    "battery_pct": 84,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-15",
    "reported_at": "2026-10-06T13:46:00+09:00",
    "battery_pct": 78,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-21",
    "reported_at": "2026-10-06T13:19:00+09:00",
    "battery_pct": 67,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-21",
    "reported_at": "2026-10-06T13:41:00+09:00",
    "battery_pct": 64,
    "content_version": "v2.4.0"
  },
  {
    "device_id": "XR-24",
    "reported_at": "2026-10-06T13:19:00+09:00",
    "battery_pct": 34,
    "content_version": "2.4.0"
  },
  {
    "device_id": "XR-24",
    "reported_at": "2026-10-06T13:47:00+09:00",
    "battery_pct": 26,
    "content_version": "2.4.0"
  }
]