{
  "site_No": "site_seocho",
  "last_index_safety": {
    "ppe": 0,
    "fall": 0,
    "danger": 0
  },
  "last_index_productivity": {
    "excavator_work_time_sec": 131,
    "dump_in": 1,
    "dump_out": 1
  },
  "info_change_timestamp": "20260429-180000"
}