-- 回滚员工代收款账单闭环 Schema。
-- 任一本 Change 的业务事实或新增审批场景配置存在时均禁止破坏性回滚：
-- 已产生的账单、申请、分摊、退款冲销事实无法通过重建 Schema 恢复。

DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM tb_employee_collection_bill)
       OR EXISTS (SELECT 1 FROM tb_employee_collection_payment_method)
       OR EXISTS (SELECT 1 FROM tb_employee_collection_application)
       OR EXISTS (SELECT 1 FROM tb_employee_collection_application_attempt)
       OR EXISTS (SELECT 1 FROM tb_employee_collection_application_allocation)
       OR EXISTS (SELECT 1 FROM tb_employee_collection_bill_refund) THEN
        RAISE EXCEPTION '存在员工代收款账单业务事实，禁止回滚员工代收款账单迁移';
    END IF;
    IF EXISTS (SELECT 1 FROM tb_wecom_approval_scene WHERE business_type = 'employee_collection_approval') THEN
        RAISE EXCEPTION '存在员工代收款核销审批场景配置，禁止回滚员工代收款账单迁移';
    END IF;
END $$;

ALTER TABLE tb_wecom_approval_scene
    DROP CONSTRAINT IF EXISTS chk_wecom_approval_scene_business;

ALTER TABLE tb_wecom_approval_scene
    ADD CONSTRAINT chk_wecom_approval_scene_business
    CHECK (business_type IN ('refund_approval', 'offline_recharge_approval'));

DROP TABLE IF EXISTS tb_employee_collection_bill_refund;
DROP TABLE IF EXISTS tb_employee_collection_application_allocation;
DROP TABLE IF EXISTS tb_employee_collection_application_attempt;
DROP TABLE IF EXISTS tb_employee_collection_application;
DROP TABLE IF EXISTS tb_employee_collection_bill;
DROP TABLE IF EXISTS tb_employee_collection_payment_method;