[
  {
    "reading_no": "RD-0818-001",
    "measured_at": "2026-08-18T05:00:00",
    "barn_code_raw": "A동",
    "temp_c": 24.1,
    "humidity_pct": 62,
    "nh3_ppm": 8.4,
    "co2_ppm": 1450,
    "fan_state": "low",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-002",
    "measured_at": "2026-08-18T05:10:00",
    "barn_code_raw": "A동",
    "temp_c": 24.4,
    "humidity_pct": 63.5,
    "nh3_ppm": 9.1,
    "co2_ppm": 1520,
    "fan_state": "low",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-003",
    "measured_at": "2026-08-18T05:20:00",
    "barn_code_raw": "A동",
    "temp_c": 25,
    "humidity_pct": 71.2,
    "nh3_ppm": 26.5,
    "co2_ppm": 2380,
    "fan_state": "low",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-004",
    "measured_at": "2026-08-18T05:30:00",
    "barn_code_raw": "A동",
    "temp_c": 25.3,
    "humidity_pct": 73,
    "nh3_ppm": 28.9,
    "co2_ppm": 2510,
    "fan_state": "low",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-005",
    "measured_at": "2026-08-18T05:40:00",
    "barn_code_raw": "B동",
    "temp_c": 31.6,
    "humidity_pct": 84,
    "nh3_ppm": 14.2,
    "co2_ppm": 1980,
    "fan_state": "high",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-006",
    "measured_at": "2026-08-18T05:50:00",
    "barn_code_raw": "B동",
    "temp_c": 32.2,
    "humidity_pct": 86.5,
    "nh3_ppm": 15,
    "co2_ppm": 2040,
    "fan_state": "high",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-007",
    "measured_at": "2026-08-18T06:00:00",
    "barn_code_raw": "B동",
    "temp_c": null,
    "humidity_pct": null,
    "nh3_ppm": null,
    "co2_ppm": null,
    "fan_state": "unknown",
    "sensor_flag": "통신 두절"
  },
  {
    "reading_no": "RD-0818-008",
    "measured_at": "2026-08-18T06:10:00",
    "barn_code_raw": "B동",
    "temp_c": 32,
    "humidity_pct": 85.1,
    "nh3_ppm": 13.8,
    "co2_ppm": 1960,
    "fan_state": "high",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-009",
    "measured_at": "2026-08-18T06:20:00",
    "barn_code_raw": "C동",
    "temp_c": 18.9,
    "humidity_pct": 55,
    "nh3_ppm": 4.1,
    "co2_ppm": 980,
    "fan_state": "off",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-010",
    "measured_at": "2026-08-18T06:30:00",
    "barn_code_raw": "C동",
    "temp_c": 19.2,
    "humidity_pct": 54,
    "nh3_ppm": 3.7,
    "co2_ppm": 940,
    "fan_state": "off",
    "sensor_flag": null
  },
  {
    "reading_no": "RD-0818-011",
    "measured_at": "2026-08-18T06:40:00",
    "barn_code_raw": "C동",
    "temp_c": 87,
    "humidity_pct": 100,
    "nh3_ppm": 0,
    "co2_ppm": 0,
    "fan_state": "off",
    "sensor_flag": "센서 이상치"
  },
  {
    "reading_no": "RD-0818-012",
    "measured_at": "2026-08-18T06:50:00",
    "barn_code_raw": "D동",
    "temp_c": 26.4,
    "humidity_pct": 68,
    "nh3_ppm": 11,
    "co2_ppm": 1610,
    "fan_state": "low",
    "sensor_flag": "미등록 동"
  },
  {
    "reading_no": "RD-0818-013",
    "measured_at": "2026-08-18T07:00:00",
    "barn_code_raw": "A동",
    "temp_c": 25.8,
    "humidity_pct": 74.5,
    "nh3_ppm": 31.2,
    "co2_ppm": 2640,
    "fan_state": "low",
    "sensor_flag": null
  }
]