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sub2api/backend/migrations/006_add_users_allowed_groups_compat.sql

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-- 兼容旧库:若尚未创建 user_allowed_groups则确保 users.allowed_groups 存在,避免 007 迁移回填失败。
DO $$
BEGIN
IF to_regclass('public.user_allowed_groups') IS NULL THEN
IF EXISTS (
SELECT 1
FROM information_schema.tables
WHERE table_schema = 'public'
AND table_name = 'users'
) THEN
ALTER TABLE users
ADD COLUMN IF NOT EXISTS allowed_groups BIGINT[] DEFAULT NULL;
END IF;
END IF;
END $$;