在准备环境前提交次全部更改。

db/fdw/setup_fdw_test.sql

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+-- =============================================================================
+-- FDW 映射配置（测试环境）— 在 test_zqyy_app 数据库中执行
+-- 用途：通过 postgres_fdw 将 test_etl_feiqiu.app schema 只读映射到 test_zqyy_app，
+--       使业务后端在测试环境下无需直接连接 ETL 测试库即可读取汇总/维度数据。
+-- 前提：test_etl_feiqiu 数据库已部署 app schema 及 app_reader 角色
+-- 基于 setup_fdw.sql，仅将目标库替换为测试库
+-- =============================================================================
+
+-- -----------------------------------------------------------------------------
+-- 1. 安装 postgres_fdw 扩展
+-- -----------------------------------------------------------------------------
+CREATE EXTENSION IF NOT EXISTS postgres_fdw;
+
+-- -----------------------------------------------------------------------------
+-- 2. 创建外部服务器（指向 test_etl_feiqiu 测试库）
+--    部署时按实际环境替换 host / port
+-- -----------------------------------------------------------------------------
+CREATE SERVER IF NOT EXISTS test_etl_feiqiu_server
+    FOREIGN DATA WRAPPER postgres_fdw
+    OPTIONS (host 'localhost', dbname 'test_etl_feiqiu', port '5432');
+
+-- -----------------------------------------------------------------------------
+-- 3. 创建用户映射（只读角色）
+--    app_user  = test_zqyy_app 侧的应用连接角色
+--    app_reader = test_etl_feiqiu 侧的只读角色
+--    密码占位符 '***'，部署时替换为真实凭据
+-- -----------------------------------------------------------------------------
+CREATE USER MAPPING IF NOT EXISTS FOR app_user
+    SERVER test_etl_feiqiu_server
+    OPTIONS (user 'app_reader', password '***');
+
+-- -----------------------------------------------------------------------------
+-- 4. 创建目标 schema（存放外部表）
+-- -----------------------------------------------------------------------------
+CREATE SCHEMA IF NOT EXISTS fdw_etl;
+
+-- -----------------------------------------------------------------------------
+-- 5. 导入 test_etl_feiqiu.app schema 的所有外部表到 fdw_etl
+-- -----------------------------------------------------------------------------
+IMPORT FOREIGN SCHEMA app
+    FROM SERVER test_etl_feiqiu_server
+    INTO fdw_etl;
+
+-- -----------------------------------------------------------------------------
+-- 6. 授权：允许 app_user 访问 fdw_etl schema 及其外部表
+-- -----------------------------------------------------------------------------
+GRANT USAGE ON SCHEMA fdw_etl TO app_user;
+GRANT SELECT ON ALL TABLES IN SCHEMA fdw_etl TO app_user;
+
+-- 未来新导入的外部表自动授权
+ALTER DEFAULT PRIVILEGES IN SCHEMA fdw_etl GRANT SELECT ON TABLES TO app_user;
+
+
+-- =============================================================================
+-- 回滚脚本（按逆序执行）
+-- =============================================================================
+-- ALTER DEFAULT PRIVILEGES IN SCHEMA fdw_etl REVOKE SELECT ON TABLES FROM app_user;
+-- REVOKE SELECT ON ALL TABLES IN SCHEMA fdw_etl FROM app_user;
+-- REVOKE USAGE ON SCHEMA fdw_etl FROM app_user;
+-- DROP SCHEMA IF EXISTS fdw_etl CASCADE;
+-- DROP USER MAPPING IF EXISTS FOR app_user SERVER test_etl_feiqiu_server;
+-- DROP SERVER IF EXISTS test_etl_feiqiu_server CASCADE;
+-- DROP EXTENSION IF EXISTS postgres_fdw;