{
  "biz": "pro-task-duration-20261015",
  "target": "36.213.150.237:10000/mom-hm",
  "table": "mes_pro_task.duration",
  "executedAt": "2026-10-15",
  "scope": "全部未删除生产任务（deleted=0，共 604 条），原 duration 全为 NULL",
  "formula": "duration = 无绑定设备或总效率<=0 ? 0 : CEIL(排产数量 / Σ(设备production_efficiency × max(conveyor_belt,1)))",
  "verify": {
    "updated": 604,
    "zero": 118,
    "min": 0,
    "max": 116,
    "avg": 1.93,
    "recheckMismatch": 0
  },
  "zeroReason": "118 个 0 值 = 工作站未绑定任何设备（与后端 calculateDuration 返回 0 一致）",
  "rollback": "UPDATE mes_pro_task SET duration=NULL WHERE deleted=0;",
  "notes": [
    "口径复刻后端 MesProTaskServiceImpl#calculateDuration，只改 duration 单列，不触碰 start_time/end_time。",
    "production_efficiency 单位为每小时产量，故时长=数量/效率，不再除以 60。",
    "已用 SQL 独立复算，604 条写入值与复算值零差异。"
  ]
}