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Agent skill

Postgres Patterns

by affaan-m in affaan-m/ECC

쿼리 최적화, 스키마 설계, 인덱싱, 보안을 위한 PostgreSQL 데이터베이스 패턴. An agent skill from affaan-m/ECC.

MITAuto-check passedDatabases

Install Postgres Patterns

skills CLI
$ npx skills add affaan-m/ECC --skill postgres-patterns -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install affaan-m/ECC postgres-patterns --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .claude/skills && cp -r skills-src/docs/ko-KR/skills/postgres-patterns .claude/skills/postgres-patterns && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
postgres-patterns
GitHub stars
274k
Used in
2 other repos
Token cost
~850 tokens
SKILL.md length
193 words
Files
1
Skills in repo
657
Repo updated
First seen
Licence
MIT

At a glance

쿼리 최적화, 스키마 설계, 인덱싱, 보안을 위한 PostgreSQL 데이터베이스 패턴. An agent skill from affaan-m/ECC.

  • Databases work in your project
  • SKILL.md covers 활성화 시점, 빠른 참조 and 관련 항목
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Postgres Patterns is an agent skill from affaan-m/ECC. 쿼리 최적화, 스키마 설계, 인덱싱, 보안을 위한 PostgreSQL 데이터베이스 패턴. Supabase 모범 사례 기반.

Its SKILL.md is about 850 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Databases. It works with PostgreSQL and Supabase. The repository describes itself as: The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond. The licence is MIT.

When your agent uses it

  • Databases work in your project

Example prompts

  • “/postgres-patterns”

What it can do on your machine

Read from SKILL.md and the folder at commit ef648e0. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are sql).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Postgres Patterns loads about 850 tokens when it runs. Until then it costs about 22 tokens; SKILL.md has 193 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~22
When it runs · the whole SKILL.md, loaded when a task matches
~850

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from affaan-m/ECC at commit ef648e0, republished under its MIT licence (© affaan-m). 193 words, ~850 tokens.

Download SKILL.mdSave it as .claude/skills/postgres-patterns/SKILL.md (or your agent's skills folder).
name
postgres-patterns
description
쿼리 최적화, 스키마 설계, 인덱싱, 보안을 위한 PostgreSQL 데이터베이스 패턴. Supabase 모범 사례 기반.
origin
ECC

PostgreSQL 패턴

PostgreSQL 모범 사례 빠른 참조. 자세한 가이드는 database-reviewer 에이전트를 사용하세요.

활성화 시점

  • SQL 쿼리 또는 마이그레이션을 작성할 때
  • 데이터베이스 스키마를 설계할 때
  • 느린 쿼리를 문제 해결할 때
  • Row Level Security를 구현할 때
  • 커넥션 풀링을 설정할 때

빠른 참조

인덱스 치트 시트
쿼리 패턴인덱스 유형예시
WHERE col = valueB-tree (기본값)CREATE INDEX idx ON t (col)
WHERE col > valueB-treeCREATE INDEX idx ON t (col)
WHERE a = x AND b > yCompositeCREATE INDEX idx ON t (a, b)
WHERE jsonb @> '{}'GINCREATE INDEX idx ON t USING gin (col)
WHERE tsv @@ queryGINCREATE INDEX idx ON t USING gin (col)
시계열 범위BRINCREATE INDEX idx ON t USING brin (col)
데이터 타입 빠른 참조
사용 사례올바른 타입지양
IDbigintint, random UUID
문자열textvarchar(255)
타임스탬프timestamptztimestamp
금액numeric(10,2)float
플래그booleanvarchar, int
일반 패턴

복합 인덱스 순서:

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'

커버링 인덱스:

sql
CREATE INDEX idx ON users (email) INCLUDE (name, created_at);
-- Avoids table lookup for SELECT email, name, created_at

부분 인덱스:

sql
CREATE INDEX idx ON users (email) WHERE deleted_at IS NULL;
-- Smaller index, only includes active users

RLS 정책 (최적화):

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;

커서 페이지네이션:

sql
SELECT * FROM products WHERE id > $last_id ORDER BY id LIMIT 20;
-- O(1) vs OFFSET which is O(n)

큐 처리:

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 *;
안티패턴 감지
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;
구성 템플릿
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();

관련 항목

  • 에이전트: database-reviewer - 전체 데이터베이스 리뷰 워크플로우
  • 스킬: clickhouse-io - ClickHouse 분석 패턴
  • 스킬: backend-patterns - API 및 백엔드 패턴

Supabase Agent Skills 기반 (크레딧: Supabase 팀) (MIT License)

© affaan-m, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in docs/ko-KR/skills/postgres-patterns of affaan-m/ECC.

Open the folder on GitHubat commit ef648e0

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in affaan-m/ECC, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Postgres Patterns next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Postgres Patterns compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Postgres Patterns this skillaffaan-m/ECC274k2 repos~850Automated safety check: PassMIT
Supabase Postgres Best Practicessupabase/agent-skills2.7k24 repos~808Automated safety check: PassMIT
Add Backendahpxex/open-dashboard146—~3.6kAutomated safety check: PassMIT
Take Doc Screenshotspgplex/pgconsole155—~841Automated safety check: PassApache-2.0
Srtd Devt1mmen/srtd105—~2.3kAutomated safety check: PassMIT
Srtd CLIt1mmen/srtd105—~360Automated safety check: PassMIT

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Works with

Categories

Questions about Postgres Patterns

What does Postgres Patterns do?

쿼리 최적화, 스키마 설계, 인덱싱, 보안을 위한 PostgreSQL 데이터베이스 패턴. An agent skill from affaan-m/ECC. Postgres Patterns is an agent skill from affaan-m/ECC. 쿼리 최적화, 스키마 설계, 인덱싱, 보안을 위한 PostgreSQL 데이터베이스 패턴.

When should I use Postgres Patterns?

Postgres Patterns fits situations like: databases work in your project.

How do I install Postgres Patterns in Claude Code?

Run `npx skills add affaan-m/ECC --skill postgres-patterns -a claude-code`. Or copy the skill folder (docs/ko-KR/skills/postgres-patterns in affaan-m/ECC) into .claude/skills/postgres-patterns in your project. Claude Code loads it when a task matches its description.

How do I install Postgres Patterns in Codex?

Run `npx skills add affaan-m/ECC --skill postgres-patterns -a codex`. Or copy the skill folder (docs/ko-KR/skills/postgres-patterns in affaan-m/ECC) into .agents/skills/postgres-patterns in your project. Codex loads it when a task matches its description.

Can I use Postgres Patterns in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add affaan-m/ECC --skill postgres-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/postgres-patterns, .gemini/skills/postgres-patterns, .github/skills/postgres-patterns and .opencode/skills/postgres-patterns in your project.

What does Postgres Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: Postgres Patterns is instructions for the agent only.

Does Postgres Patterns access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Postgres Patterns safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Postgres Patterns use?

Postgres Patterns is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Postgres Patterns use?

About 850 tokens (SKILL.md is roughly 3.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Postgres Patterns?

Skills that share tags, products or a category with Postgres Patterns: Supabase Postgres Best Practices (supabase/agent-skills, 2.7k stars), Add Backend (ahpxex/open-dashboard, 146 stars), Take Doc Screenshots (pgplex/pgconsole, 155 stars) and Srtd Dev (t1mmen/srtd, 105 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Postgres Patterns?

affaan-m (a GitHub user) maintains it in affaan-m/ECC, which has 274,360 GitHub stars. The repository holds 657 skills in this directory. The repository was last updated on October 5, 2026.

Source: affaan-m/ECC on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.