{
  "site_No": "서초_서리풀_001",
  "last_index_safety": {
    "ppe": 0,
    "fall": 0,
    "danger": 15
  },
  "last_index_productivity": {
    "excavator_work_time_sec": 127,
    "dump_in": 1,
    "dump_out": 1
  },
  "info_change_timestamp": "20260513-112153"
}