[
  {
    "event_id": "e_001",
    "machine_raw": "EQ-01",
    "machine_id": "eq_01",
    "metric": "defect_rate",
    "value": 1.2,
    "event_time": "2026-05-01T09:00"
  },
  {
    "event_id": "e_002",
    "machine_raw": "EQ-01",
    "machine_id": "eq_01",
    "metric": "defect_rate",
    "value": 8.7,
    "event_time": "2026-05-01T13:00"
  },
  {
    "event_id": "e_003",
    "machine_raw": "eq 01",
    "machine_id": "eq_01",
    "metric": "temp",
    "value": null,
    "event_time": "2026-05-01T13:05"
  },
  {
    "event_id": "e_004",
    "machine_raw": "EQ-02",
    "machine_id": "eq_02",
    "metric": "temp",
    "value": 240,
    "event_time": "2026-05-01T10:00"
  },
  {
    "event_id": "e_005",
    "machine_raw": "EQ-02",
    "machine_id": "eq_02",
    "metric": "defect_rate",
    "value": 2,
    "event_time": "2026-05-01T10:05"
  },
  {
    "event_id": "e_006",
    "machine_raw": "EQ-03",
    "machine_id": null,
    "metric": "stock_qty",
    "value": 0,
    "event_time": "2026-05-01T08:00"
  },
  {
    "event_id": "e_007",
    "machine_raw": "EQ-01",
    "machine_id": "eq_01",
    "metric": "stock_qty",
    "value": 5,
    "event_time": "2026-05-02T08:00"
  },
  {
    "event_id": "e_008",
    "machine_raw": "EQ-02",
    "machine_id": "eq_02",
    "metric": "temp",
    "value": 185,
    "event_time": "2026-05-02T10:00"
  },
  {
    "event_id": "e_009",
    "machine_raw": "EQ-03",
    "machine_id": null,
    "metric": "defect_rate",
    "value": 3.1,
    "event_time": "2026-05-02T11:00"
  },
  {
    "event_id": "e_010",
    "machine_raw": "EQ-01",
    "machine_id": "eq_01",
    "metric": "defect_rate",
    "value": null,
    "event_time": "2026-05-02T13:00"
  },
  {
    "event_id": "e_011",
    "machine_raw": "EQ-02 ",
    "machine_id": "eq_02",
    "metric": "stock_qty",
    "value": 50,
    "event_time": "2026-05-02T08:00"
  }
]