-- 下单模板：自定义映射与样例文件
ALTER TABLE `t_order_template`
  ADD COLUMN `StandardTemplateKey` VARCHAR(64) NULL COMMENT '映射所依据的标准模板 TemplateKey' AFTER `TemplateKey`,
  ADD COLUMN `MappingStatus` VARCHAR(16) NULL COMMENT 'draft/ready；标准模板为 ready' AFTER `StandardTemplateKey`,
  ADD COLUMN `SourceFileName` VARCHAR(256) NULL COMMENT '客户上传样例文件名' AFTER `MappingStatus`,
  ADD COLUMN `SourceFilePath` VARCHAR(512) NULL COMMENT '样例文件相对路径 /uploads/...' AFTER `SourceFileName`,
  ADD COLUMN `SourceHeadersJson` TEXT NULL COMMENT '客户 Excel 表头 JSON 数组' AFTER `SourceFilePath`,
  ADD COLUMN `ColumnMappingJson` TEXT NULL COMMENT '标准字段与客户列映射 JSON' AFTER `SourceHeadersJson`;

UPDATE `t_order_template`
SET `MappingStatus` = 'ready'
WHERE `Type` = 'standard' AND (`MappingStatus` IS NULL OR `MappingStatus` = '');