-- 二期称重结果审计字段增量迁移（可重复执行）。
-- InboundWeightResultEntity 继承 BaseEntity，持久化需要 created_by、updated_by 两个审计字段。
SET @has_created_by := (
  SELECT COUNT(*) FROM information_schema.columns
  WHERE table_schema = DATABASE() AND table_name = 'fl_inbound_weight_result' AND column_name = 'created_by'
);
SET @created_by_sql := IF(@has_created_by = 0,
  'ALTER TABLE fl_inbound_weight_result ADD COLUMN created_by BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT ''创建人ID'' AFTER confirmed_at',
  'SELECT 1');
PREPARE created_by_stmt FROM @created_by_sql;
EXECUTE created_by_stmt;
DEALLOCATE PREPARE created_by_stmt;

SET @has_updated_by := (
  SELECT COUNT(*) FROM information_schema.columns
  WHERE table_schema = DATABASE() AND table_name = 'fl_inbound_weight_result' AND column_name = 'updated_by'
);
SET @updated_by_sql := IF(@has_updated_by = 0,
  'ALTER TABLE fl_inbound_weight_result ADD COLUMN updated_by BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT ''最后修改人ID'' AFTER created_at',
  'SELECT 1');
PREPARE updated_by_stmt FROM @updated_by_sql;
EXECUTE updated_by_stmt;
DEALLOCATE PREPARE updated_by_stmt;