-- 幂等补 ConcurrencyStamp：已存在则跳过 ADD，只做回填/NOT NULL。
-- 执行前请备份。

-- 先看现状（可选）
SELECT TABLE_NAME, COLUMN_NAME, IS_NULLABLE, COLUMN_TYPE
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = DATABASE()
  AND TABLE_NAME IN ('t_pickup_order', 't_pickup_order_line')
  AND COLUMN_NAME = 'ConcurrencyStamp';

-- ===== t_pickup_order =====
SET @sql := (
  SELECT IF(
    EXISTS(
      SELECT 1 FROM information_schema.COLUMNS
      WHERE TABLE_SCHEMA = DATABASE()
        AND TABLE_NAME = 't_pickup_order'
        AND COLUMN_NAME = 'ConcurrencyStamp'
    ),
    'SELECT ''t_pickup_order.ConcurrencyStamp already exists'' AS info',
    'ALTER TABLE `t_pickup_order` ADD COLUMN `ConcurrencyStamp` CHAR(36) NULL COMMENT ''并发戳'' AFTER `IsDeleted`'
  )
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

UPDATE `t_pickup_order`
SET `ConcurrencyStamp` = UUID()
WHERE `ConcurrencyStamp` IS NULL OR `ConcurrencyStamp` = '';

ALTER TABLE `t_pickup_order`
  MODIFY COLUMN `ConcurrencyStamp` CHAR(36) NOT NULL COMMENT '并发戳';

-- ===== t_pickup_order_line =====
SET @sql := (
  SELECT IF(
    EXISTS(
      SELECT 1 FROM information_schema.COLUMNS
      WHERE TABLE_SCHEMA = DATABASE()
        AND TABLE_NAME = 't_pickup_order_line'
        AND COLUMN_NAME = 'ConcurrencyStamp'
    ),
    'SELECT ''t_pickup_order_line.ConcurrencyStamp already exists'' AS info',
    'ALTER TABLE `t_pickup_order_line` ADD COLUMN `ConcurrencyStamp` CHAR(36) NULL COMMENT ''并发戳'' AFTER `IsDeleted`'
  )
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

UPDATE `t_pickup_order_line`
SET `ConcurrencyStamp` = UUID()
WHERE `ConcurrencyStamp` IS NULL OR `ConcurrencyStamp` = '';

ALTER TABLE `t_pickup_order_line`
  MODIFY COLUMN `ConcurrencyStamp` CHAR(36) NOT NULL COMMENT '并发戳';