-- +goose Up

-- 1. notifications 表新增 distribution_site_id 并添加联合索引
ALTER TABLE notifications
  ADD COLUMN distribution_site_id BIGINT UNSIGNED NULL AFTER biz_id,
  ADD KEY idx_notifications_user_site (user_id, distribution_site_id, id);

-- 2. 回填历史分销订单的站内信通知归属
UPDATE notifications n
JOIN rental_orders o ON n.biz_id = o.id
SET n.distribution_site_id = o.distribution_site_id
WHERE n.biz_type = 'order' AND o.distribution_site_id IS NOT NULL AND o.distribution_site_id > 0;

-- +goose Down

ALTER TABLE notifications
  DROP KEY idx_notifications_user_site,
  DROP COLUMN distribution_site_id;