[
  {
    "event_id": "s_001",
    "tray_id": "t_01",
    "menu_code": "M-rice",
    "served_g": 210,
    "consumed_g": 180,
    "ts": "2026-05-01T12:00:00"
  },
  {
    "event_id": "s_002",
    "tray_id": "t_01",
    "menu_code": "M-soup",
    "served_g": 300,
    "consumed_g": 300,
    "ts": "2026-05-01T12:00:05"
  },
  {
    "event_id": "s_003",
    "tray_id": "t_02",
    "menu_code": "M-rice",
    "served_g": 210,
    "consumed_g": 250,
    "ts": "2026-05-01T12:01:00"
  },
  {
    "event_id": "s_004",
    "tray_id": "t_03",
    "menu_code": "M-ZZZ",
    "served_g": 150,
    "consumed_g": 120,
    "ts": "2026-05-01T12:02:00"
  },
  {
    "event_id": "s_005",
    "tray_id": "t_04",
    "menu_code": "M-rice",
    "served_g": 210,
    "consumed_g": null,
    "ts": "2026-05-01T12:03:00"
  },
  {
    "event_id": "s_006",
    "tray_id": "t_05",
    "menu_code": "M-kimchi",
    "served_g": 80,
    "consumed_g": 40,
    "ts": "2026-05-01T12:04:00"
  },
  {
    "event_id": "s_007",
    "tray_id": "t_05",
    "menu_code": "M-kimchi",
    "served_g": 80,
    "consumed_g": 40,
    "ts": "2026-05-01T12:04:02"
  },
  {
    "event_id": "s_008",
    "tray_id": "t_06",
    "menu_code": null,
    "served_g": 200,
    "consumed_g": 150,
    "ts": "2026-05-01T12:05:00"
  },
  {
    "event_id": "s_009",
    "tray_id": "t_07",
    "menu_code": "M-side",
    "served_g": null,
    "consumed_g": 30,
    "ts": "2026-05-01T12:06:00"
  },
  {
    "event_id": "s_010",
    "tray_id": "t_08",
    "menu_code": "M-rice",
    "served_g": 210,
    "consumed_g": 0,
    "ts": "2026-05-01T12:07:00"
  },
  {
    "event_id": "s_011",
    "tray_id": "t_09",
    "menu_code": "M-soup",
    "served_g": 300,
    "consumed_g": 150,
    "ts": "2026-05-01T12:08:00"
  }
]