-- 既有分类保留当前公开行为；以后新建分类默认草稿。不要重跑已成功的增量迁移。
BEGIN;
ALTER TABLE public.categories ADD COLUMN status varchar(16) NOT NULL DEFAULT 'draft';
UPDATE public.categories SET status = 'active';
ALTER TABLE public.categories ADD CONSTRAINT categories_status_check
    CHECK (status IN ('draft', 'active', 'hidden'));
CREATE INDEX categories_status_parent_sort_idx ON public.categories (status, parent_id, sort_order, id);
COMMENT ON COLUMN public.categories.status IS '发布状态：draft 开发测试，active 上线，hidden 下架；公开访问还需所有上级分类 active';
COMMIT;