-- 回滚商户池支付路由 Schema。
-- 任一新路由支付、成功累计或新配置事实存在时均禁止破坏性回滚。
DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM tb_payment WHERE merchant_id IS NOT NULL OR merchant_pool_id IS NOT NULL)
       OR EXISTS (SELECT 1 FROM tb_payment_merchant_routing_success)
       OR EXISTS (SELECT 1 FROM tb_payment_merchant)
       OR EXISTS (SELECT 1 FROM tb_payment_merchant_pool)
       OR EXISTS (SELECT 1 FROM tb_payment_merchant_pool_member)
       OR EXISTS (SELECT 1 FROM tb_wechat_authorization) THEN
        RAISE EXCEPTION '存在商户池支付路由业务事实，禁止回滚商户池支付路由迁移';
    END IF;
END $$;

DROP INDEX IF EXISTS idx_payment_merchant_pool_route;
DROP INDEX IF EXISTS idx_payment_merchant_route;

ALTER TABLE tb_payment
    DROP COLUMN IF EXISTS routing_epoch,
    DROP COLUMN IF EXISTS routing_strategy_snapshot,
    DROP COLUMN IF EXISTS merchant_pool_name_snapshot,
    DROP COLUMN IF EXISTS merchant_provider_type_snapshot,
    DROP COLUMN IF EXISTS merchant_payment_method_snapshot,
    DROP COLUMN IF EXISTS merchant_name_snapshot,
    DROP COLUMN IF EXISTS merchant_pool_id,
    DROP COLUMN IF EXISTS merchant_id;

DROP TABLE IF EXISTS tb_payment_merchant_routing_success;
DROP TABLE IF EXISTS tb_wechat_authorization;
DROP TABLE IF EXISTS tb_payment_merchant_pool_member;
DROP TABLE IF EXISTS tb_payment_merchant_pool;
DROP TABLE IF EXISTS tb_payment_merchant;