暂存一下,防止丢失

migrations/000172_add_role_default_credit.down.sql

@@ -0,0 +1,36 @@
+BEGIN;
+
+DO $$
+DECLARE
+    configured_count bigint;
+    assigned_count bigint;
+BEGIN
+    SELECT COUNT(*) INTO configured_count
+      FROM tb_role
+     WHERE default_credit_enabled OR default_credit_limit <> 0;
+    IF configured_count > 0 THEN
+        RAISE EXCEPTION '已有 % 个角色配置新建代理默认信用，禁止删除模板字段', configured_count;
+    END IF;
+
+    SELECT COUNT(*) INTO assigned_count
+      FROM tb_role_permission rp
+      JOIN tb_permission p ON p.id = rp.perm_id
+     WHERE p.perm_code = 'role:default-credit:manage'
+       AND rp.deleted_at IS NULL;
+    IF assigned_count > 0 THEN
+        RAISE EXCEPTION '角色默认信用权限已分配给 % 个角色，禁止回滚权限定义', assigned_count;
+    END IF;
+END
+$$;
+
+DELETE FROM tb_permission
+ WHERE perm_code = 'role:default-credit:manage'
+   AND deleted_at IS NULL;
+
+ALTER TABLE tb_role
+    DROP CONSTRAINT IF EXISTS chk_role_default_credit_config,
+    DROP CONSTRAINT IF EXISTS chk_role_default_credit_scope,
+    DROP COLUMN IF EXISTS default_credit_enabled,
+    DROP COLUMN IF EXISTS default_credit_limit;
+
+COMMIT;