-- 为余额核销记录增加核销人与反核销人用户主键。
-- 本脚本仅调整表结构；历史记录保持 NULL，新操作由服务写入当前登录用户ID。

SET @column_exists := (
  SELECT COUNT(1) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'ar_balance_writeoff'
    AND COLUMN_NAME = 'create_user_id'
);
SET @sql := IF(@column_exists = 0,
  'ALTER TABLE `ar_balance_writeoff` ADD COLUMN `create_user_id` bigint(20) DEFAULT NULL COMMENT ''核销人用户ID'' AFTER `remark`',
  'ALTER TABLE `ar_balance_writeoff` MODIFY COLUMN `create_user_id` bigint(20) DEFAULT NULL COMMENT ''核销人用户ID'' AFTER `remark`'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @column_exists := (
  SELECT COUNT(1) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'ar_balance_writeoff'
    AND COLUMN_NAME = 'cancel_user_id'
);
SET @sql := IF(@column_exists = 0,
  'ALTER TABLE `ar_balance_writeoff` ADD COLUMN `cancel_user_id` bigint(20) DEFAULT NULL COMMENT ''反核销人用户ID'' AFTER `create_time`',
  'ALTER TABLE `ar_balance_writeoff` MODIFY COLUMN `cancel_user_id` bigint(20) DEFAULT NULL COMMENT ''反核销人用户ID'' AFTER `create_time`'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;