# BD_Manual：app Schema 与 RLS 视图层

> 目标库：`test_etl_feiqiu`（通过 `PG_DSN` 连接）
> 迁移脚本：`db/etl_feiqiu/migrations/2026-02-24__p1_create_app_schema_rls_views.sql`
> DDL 位置：`docs/database/ddl/etl_feiqiu__app.sql`（执行后需重新生成）
> 关联 SPEC：`miniapp-db-foundation`（P1 基础设施层）

---

## 1. 变更说明

### 新增 Schema
- `app`：RLS 视图层，供业务库通过 `postgres_fdw` 只读访问 ETL 数据

### 新增角色
- `app_reader`：只读角色（`LOGIN`），拥有 `app` Schema 的 `USAGE` + `SELECT` 权限

### 新增视图（35 张）

**DWD 层（11 张，全部含 `site_id` 过滤）：**

| 视图 | 源表 | 过滤条件 |
|------|------|---------|
| `app.v_dim_member` | `dwd.dim_member` | `site_id = current_setting('app.current_site_id')::bigint` |
| `app.v_dim_assistant` | `dwd.dim_assistant` | 同上 |
| `app.v_dim_member_card_account` | `dwd.dim_member_card_account` | 同上 |
| `app.v_dim_table` | `dwd.dim_table` | 同上 |
| `app.v_dwd_settlement_head` | `dwd.dwd_settlement_head` | 同上 |
| `app.v_dwd_table_fee_log` | `dwd.dwd_table_fee_log` | 同上 |
| `app.v_dwd_assistant_service_log` | `dwd.dwd_assistant_service_log` | 同上 |
| `app.v_dwd_recharge_order` | `dwd.dwd_recharge_order` | 同上 |
| `app.v_dwd_store_goods_sale` | `dwd.dwd_store_goods_sale` | 同上 |
| `app.v_dim_staff` | `dwd.dim_staff` | 同上 |
| `app.v_dim_staff_ex` | `dwd.dim_staff_ex` | 同上 |

**DWS 层 — 含 `site_id` 过滤（20 张）：**

| 视图 | 源表 |
|------|------|
| `app.v_dws_member_consumption_summary` | `dws.dws_member_consumption_summary` |
| `app.v_dws_member_visit_detail` | `dws.dws_member_visit_detail` |
| `app.v_dws_member_winback_index` | `dws.dws_member_winback_index` |
| `app.v_dws_member_newconv_index` | `dws.dws_member_newconv_index` |
| `app.v_dws_member_recall_index` | `dws.dws_member_recall_index` |
| `app.v_dws_member_assistant_relation_index` | `dws.dws_member_assistant_relation_index` |
| `app.v_dws_member_assistant_intimacy` | `dws.dws_member_assistant_intimacy` |
| `app.v_dws_assistant_daily_detail` | `dws.dws_assistant_daily_detail` |
| `app.v_dws_assistant_monthly_summary` | `dws.dws_assistant_monthly_summary` |
| `app.v_dws_assistant_salary_calc` | `dws.dws_assistant_salary_calc` |
| `app.v_dws_assistant_customer_stats` | `dws.dws_assistant_customer_stats` |
| `app.v_dws_assistant_finance_analysis` | `dws.dws_assistant_finance_analysis` |
| `app.v_dws_finance_daily_summary` | `dws.dws_finance_daily_summary` |
| `app.v_dws_finance_income_structure` | `dws.dws_finance_income_structure` |
| `app.v_dws_finance_recharge_summary` | `dws.dws_finance_recharge_summary` |
| `app.v_dws_finance_discount_detail` | `dws.dws_finance_discount_detail` |
| `app.v_dws_finance_expense_summary` | `dws.dws_finance_expense_summary` |
| `app.v_dws_platform_settlement` | `dws.dws_platform_settlement` |
| `app.v_dws_assistant_recharge_commission` | `dws.dws_assistant_recharge_commission` |
| `app.v_dws_order_summary` | `dws.dws_order_summary` |

**DWS 层 — cfg_* 配置表（4 张，无 `site_id`，直接 `SELECT *`）：**

| 视图 | 源表 | 说明 |
|------|------|------|
| `app.v_cfg_performance_tier` | `dws.cfg_performance_tier` | 无 `site_id` 列，不加过滤 |
| `app.v_cfg_assistant_level_price` | `dws.cfg_assistant_level_price` | 同上 |
| `app.v_cfg_bonus_rules` | `dws.cfg_bonus_rules` | 同上 |
| `app.v_cfg_index_parameters` | `dws.cfg_index_parameters` | 同上 |

### 权限配置

| 角色 | Schema | 权限 |
|------|--------|------|
| `app_reader` | `app` | `USAGE` + `SELECT ON ALL TABLES` + `ALTER DEFAULT PRIVILEGES` |

### P2 预留（注释形式，暂不创建）
- `dws.dws_member_spending_power_index` → `app.v_dws_member_spending_power_index`
- `dws.dws_assistant_order_contribution` → `app.v_dws_assistant_order_contribution`

---

## 2. 兼容性影响

| 组件 | 影响 |
|------|------|
| ETL 任务 | 无影响。视图仅读取 DWD/DWS 表，不影响 ETL 写入流程 |
| 后端 API | 前置依赖。后端通过 FDW 读取 `app` Schema 视图，本脚本是 FDW 配置的前提 |
| 小程序 | 无直接影响。小程序通过后端 API 间接访问 |
| 管理后台 | 无直接影响 |
| 现有 `app` Schema | 已有 7 个视图将被 `CREATE OR REPLACE` 覆盖更新，新增 28 个视图 |

---

## 3. 回滚策略

迁移脚本末尾已包含注释形式的回滚语句，按逆序执行：

```sql
ALTER DEFAULT PRIVILEGES IN SCHEMA app REVOKE SELECT ON TABLES FROM app_reader;
REVOKE SELECT ON ALL TABLES IN SCHEMA app FROM app_reader;
REVOKE USAGE ON SCHEMA app FROM app_reader;
DROP SCHEMA IF EXISTS app CASCADE;  -- 会删除所有视图
DROP ROLE IF EXISTS app_reader;
```

注意：`DROP SCHEMA app CASCADE` 会级联删除所有视图和依赖的 FDW 外部表，需先回滚 FDW 配置。

---

## 4. 验证 SQL

```sql
-- 1. 验证 app Schema 存在
SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'app';

-- 2. 验证视图数量（应为 35 张）
SELECT count(*) FROM information_schema.views WHERE table_schema = 'app';

-- 3. 验证 app_reader 角色存在且有 app Schema 权限
SELECT has_schema_privilege('app_reader', 'app', 'USAGE') AS has_usage;

-- 4. 验证含 site_id 的视图定义包含 current_setting 过滤
SELECT table_name, view_definition
FROM information_schema.views
WHERE table_schema = 'app'
  AND view_definition LIKE '%current_setting%'
ORDER BY table_name;

-- 5. 验证 cfg_* 视图不含 current_setting 过滤
SELECT table_name, view_definition
FROM information_schema.views
WHERE table_schema = 'app'
  AND table_name LIKE 'v_cfg_%'
  AND view_definition NOT LIKE '%current_setting%';
```