BEGIN;

LOCK TABLE tb_audit_event, tb_audit_event_resource IN ACCESS EXCLUSIVE MODE;

DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM tb_audit_event LIMIT 1)
       OR EXISTS (SELECT 1 FROM tb_audit_event_resource LIMIT 1) THEN
        RAISE EXCEPTION '统一审计表已存在事实，禁止删表回滚；请停止生产者后向前修复';
    END IF;
END
$$;

DROP TABLE tb_audit_event_resource;
DROP TABLE tb_audit_event;
DROP FUNCTION reject_audit_fact_update();

COMMIT;