-- 存量库：为问题模板补充处理人字段（与 db.sql / IssueTemplate 实体对齐）
-- 可重复执行；仅在列不存在时 ADD。
-- 目标表：t_issue_template

SET @db := DATABASE();

-- HandlerType
SET @exists := (
  SELECT COUNT(1)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db
    AND TABLE_NAME = 't_issue_template'
    AND COLUMN_NAME = 'HandlerType'
);
SET @sql := IF(
  @exists = 0,
  'ALTER TABLE `t_issue_template` ADD COLUMN `HandlerType` VARCHAR(16) NULL COMMENT ''处理人类型：customer=订单所属客户，user=指定用户'' AFTER `NotifyMethod`',
  'SELECT ''HandlerType already exists'' AS info'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- HandlerUserId
SET @exists := (
  SELECT COUNT(1)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db
    AND TABLE_NAME = 't_issue_template'
    AND COLUMN_NAME = 'HandlerUserId'
);
SET @sql := IF(
  @exists = 0,
  'ALTER TABLE `t_issue_template` ADD COLUMN `HandlerUserId` INT NULL COMMENT ''指定处理人用户Id（HandlerType=user 时必填）'' AFTER `HandlerType`',
  'SELECT ''HandlerUserId already exists'' AS info'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- 历史数据默认按「指定用户」语义；无处理人时可在页面再编辑
UPDATE `t_issue_template`
SET `HandlerType` = 'user'
WHERE (`HandlerType` IS NULL OR `HandlerType` = '')
  AND `IsDeleted` = 0;