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Co-authored-by: neo <neo.dowithless@gmail.com>

docs/zh-CN/skills/postgres-patterns/SKILL.md

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+---
+name: postgres-patterns
+description: 基于Supabase最佳实践的PostgreSQL数据库模式，用于查询优化、架构设计、索引和安全。
+---
+
+# PostgreSQL 模式
+
+PostgreSQL 最佳实践快速参考。如需详细指导，请使用 `database-reviewer` 智能体。
+
+## 何时激活
+
+* 编写 SQL 查询或迁移时
+* 设计数据库模式时
+* 排查慢查询时
+* 实施行级安全性时
+* 设置连接池时
+
+## 快速参考
+
+### 索引速查表
+
+| 查询模式 | 索引类型 | 示例 |
+|--------------|------------|---------|
+| `WHERE col = value` | B-tree（默认） | `CREATE INDEX idx ON t (col)` |
+| `WHERE col > value` | B-tree | `CREATE INDEX idx ON t (col)` |
+| `WHERE a = x AND b > y` | 复合索引 | `CREATE INDEX idx ON t (a, b)` |
+| `WHERE jsonb @> '{}'` | GIN | `CREATE INDEX idx ON t USING gin (col)` |
+| `WHERE tsv @@ query` | GIN | `CREATE INDEX idx ON t USING gin (col)` |
+| 时间序列范围查询 | BRIN | `CREATE INDEX idx ON t USING brin (col)` |
+
+### 数据类型快速参考
+
+| 使用场景 | 正确类型 | 避免使用 |
+|----------|-------------|-------|
+| ID | `bigint` | `int`，随机 UUID |
+| 字符串 | `text` | `varchar(255)` |
+| 时间戳 | `timestamptz` | `timestamp` |
+| 货币 | `numeric(10,2)` | `float` |
+| 标志位 | `boolean` | `varchar`，`int` |
+
+### 常见模式
+
+**复合索引顺序：**
+
+```sql
+-- Equality columns first, then range columns
+CREATE INDEX idx ON orders (status, created_at);
+-- Works for: WHERE status = 'pending' AND created_at > '2024-01-01'
+```
+
+**覆盖索引：**
+
+```sql
+CREATE INDEX idx ON users (email) INCLUDE (name, created_at);
+-- Avoids table lookup for SELECT email, name, created_at
+```
+
+**部分索引：**
+
+```sql
+CREATE INDEX idx ON users (email) WHERE deleted_at IS NULL;
+-- Smaller index, only includes active users
+```
+
+**RLS 策略（优化版）：**
+
+```sql
+CREATE POLICY policy ON orders
+  USING ((SELECT auth.uid()) = user_id);  -- Wrap in SELECT!
+```
+
+**UPSERT：**
+
+```sql
+INSERT INTO settings (user_id, key, value)
+VALUES (123, 'theme', 'dark')
+ON CONFLICT (user_id, key)
+DO UPDATE SET value = EXCLUDED.value;
+```
+
+**游标分页：**
+
+```sql
+SELECT * FROM products WHERE id > $last_id ORDER BY id LIMIT 20;
+-- O(1) vs OFFSET which is O(n)
+```
+
+**队列处理：**
+
+```sql
+UPDATE jobs SET status = 'processing'
+WHERE id = (
+  SELECT id FROM jobs WHERE status = 'pending'
+  ORDER BY created_at LIMIT 1
+  FOR UPDATE SKIP LOCKED
+) RETURNING *;
+```
+
+### 反模式检测\*\*
+
+```sql
+-- Find unindexed foreign keys
+SELECT conrelid::regclass, a.attname
+FROM pg_constraint c
+JOIN pg_attribute a ON a.attrelid = c.conrelid AND a.attnum = ANY(c.conkey)
+WHERE c.contype = 'f'
+  AND NOT EXISTS (
+    SELECT 1 FROM pg_index i
+    WHERE i.indrelid = c.conrelid AND a.attnum = ANY(i.indkey)
+  );
+
+-- Find slow queries
+SELECT query, mean_exec_time, calls
+FROM pg_stat_statements
+WHERE mean_exec_time > 100
+ORDER BY mean_exec_time DESC;
+
+-- Check table bloat
+SELECT relname, n_dead_tup, last_vacuum
+FROM pg_stat_user_tables
+WHERE n_dead_tup > 1000
+ORDER BY n_dead_tup DESC;
+```
+
+### 配置模板
+
+```sql
+-- Connection limits (adjust for RAM)
+ALTER SYSTEM SET max_connections = 100;
+ALTER SYSTEM SET work_mem = '8MB';
+
+-- Timeouts
+ALTER SYSTEM SET idle_in_transaction_session_timeout = '30s';
+ALTER SYSTEM SET statement_timeout = '30s';
+
+-- Monitoring
+CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
+
+-- Security defaults
+REVOKE ALL ON SCHEMA public FROM public;
+
+SELECT pg_reload_conf();
+```
+
+## 相关
+
+* 智能体：`database-reviewer` - 完整的数据库审查工作流
+* 技能：`clickhouse-io` - ClickHouse 分析模式
+* 技能：`backend-patterns` - API 和后端模式
+
+***
+
+*基于 [Supabase Agent Skills](https://github.com/supabase/agent-skills) (MIT License)*