-- Author: fruit.com.cn
-- K108 后台收藏/点赞列表按时间倒序的分页索引。
-- 列表默认 ORDER BY created_at DESC, id DESC，且实体走逻辑删除（deleted = 0），
-- 原有索引只覆盖 (user_id, created_at) / (device_id, created_at) 前缀，
-- 不加筛选条件时会退化成全表扫描 + 排序。
BEGIN;

CREATE INDEX IF NOT EXISTS idx_content_like_created
  ON content_like (created_at DESC, id DESC) WHERE deleted = 0;

CREATE INDEX IF NOT EXISTS idx_user_favorite_created
  ON user_favorite (created_at DESC, id DESC) WHERE deleted = 0;

COMMIT;