Agent skill

Postgres Patterns

by ThibautBaissac in ThibautBaissac/rails_ai_agents

PostgreSQL database patterns for query optimization, schema design, indexing, and security.

MITAuto-check passedDatabases

Install Postgres Patterns

skills CLI

$ npx skills add ThibautBaissac/rails_ai_agents --skill postgres-patterns -a claude-code

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

GitHub CLI

$ gh skill install ThibautBaissac/rails_ai_agents 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/ThibautBaissac/rails_ai_agents.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/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/

Paste into Claude Code

Install the "postgres-patterns" agent skill from https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.agents/skills/postgres-patterns into .claude/skills/postgres-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postgres-patterns", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.agents/skills/postgres-patterns

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add ThibautBaissac/rails_ai_agents --skill postgres-patterns -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install ThibautBaissac/rails_ai_agents postgres-patterns --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ThibautBaissac/rails_ai_agents.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/postgres-patterns .agents/skills/postgres-patterns && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "postgres-patterns" agent skill from https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.agents/skills/postgres-patterns into .agents/skills/postgres-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postgres-patterns", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ThibautBaissac/rails_ai_agents --skill postgres-patterns -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install ThibautBaissac/rails_ai_agents postgres-patterns --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ThibautBaissac/rails_ai_agents.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/postgres-patterns .cursor/skills/postgres-patterns && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "postgres-patterns" agent skill from https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.agents/skills/postgres-patterns into .cursor/skills/postgres-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postgres-patterns", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/ThibautBaissac/rails_ai_agents.git --path .agents/skills/postgres-patterns

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add ThibautBaissac/rails_ai_agents --skill postgres-patterns -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install ThibautBaissac/rails_ai_agents postgres-patterns --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ThibautBaissac/rails_ai_agents.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/postgres-patterns .gemini/skills/postgres-patterns && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "postgres-patterns" agent skill from https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.agents/skills/postgres-patterns into .gemini/skills/postgres-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postgres-patterns", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install ThibautBaissac/rails_ai_agents postgres-patterns

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add ThibautBaissac/rails_ai_agents --skill postgres-patterns -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/ThibautBaissac/rails_ai_agents.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/postgres-patterns .github/skills/postgres-patterns && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "postgres-patterns" agent skill from https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.agents/skills/postgres-patterns into .github/skills/postgres-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postgres-patterns", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ThibautBaissac/rails_ai_agents --skill postgres-patterns -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install ThibautBaissac/rails_ai_agents postgres-patterns --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ThibautBaissac/rails_ai_agents.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/postgres-patterns .opencode/skills/postgres-patterns && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "postgres-patterns" agent skill from https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.agents/skills/postgres-patterns into .opencode/skills/postgres-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postgres-patterns", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: postgres-patterns
GitHub stars: 665
Used in: 7 other repos
Token cost: ~922 tokens
SKILL.md length: 182 words
Files: 1
Skills in repo: 19
Repo updated: Jun 1, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

PostgreSQL database patterns for query optimization, schema design, indexing, and security.

Tasks that involve Query optimization
SKILL.md covers When to Activate, Quick Reference and Related
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Tasks that involve Database schema design

What it does

Postgres Patterns is an agent skill from ThibautBaissac/rails_ai_agents. PostgreSQL database patterns for query optimization, schema design, indexing, and security.

Its SKILL.md is about 920 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, covering Query optimization and Database schema design. It works with PostgreSQL. The repository describes itself as: Specialized AI skills, agents, rules and hooks for modern Rails AI driven-development + Spec-Driven-Development kit + MCP. The licence is MIT.

When your agent uses it

Tasks that involve Query optimization
Tasks that involve Database schema design

Example prompts

“/postgres-patterns”

What it can do on your machine

Read from SKILL.md and the folder at commit 03622f2. 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 922 tokens when it runs. Until then it costs about 27 tokens; SKILL.md has 182 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~27
When it runs · the whole SKILL.md, loaded when a task matches: ~922

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 ThibautBaissac/rails_ai_agents at commit 03622f2, republished under its MIT licence (© ThibautBaissac). 182 words, ~922 tokens.

Download SKILL.mdSave it as .claude/skills/postgres-patterns/SKILL.md (or your agent's skills folder).

name: postgres-patterns
description: PostgreSQL database patterns for query optimization, schema design, indexing, and security.

PostgreSQL Patterns

Quick reference for PostgreSQL best practices. For detailed guidance, use the database-reviewer agent.

When to Activate

Writing SQL queries or migrations
Designing database schemas
Troubleshooting slow queries
Implementing Row Level Security
Setting up connection pooling

Quick Reference

Index Cheat Sheet

Query Pattern	Index Type	Example
`WHERE col = value`	B-tree (default)	`CREATE INDEX idx ON t (col)`
`WHERE col > value`	B-tree	`CREATE INDEX idx ON t (col)`
`WHERE a = x AND b > y`	Composite	`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)`
Time-series ranges	BRIN	`CREATE INDEX idx ON t USING brin (col)`

Data Type Quick Reference

Use Case	Correct Type	Avoid
IDs	`bigint`	`int`, random UUID
Strings	`text`	`varchar(255)`
Timestamps	`timestamptz`	`timestamp`
Money	`numeric(10,2)`	`float`
Flags	`boolean`	`varchar`, `int`

Common Patterns

Composite Index Order:

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'

Covering Index:

sql

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

Partial Index:

sql

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

RLS Policy (Optimized):

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;

Cursor Pagination:

sql

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

Queue Processing:

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 *;

Anti-Pattern Detection

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;

Configuration Template

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();

Agent: database-reviewer - Full database review workflow
Skill: clickhouse-io - ClickHouse analytics patterns
Skill: backend-patterns - API and backend patterns

Files

Just SKILL.md in .agents/skills/postgres-patterns of ThibautBaissac/rails_ai_agents.

Open the folder on GitHubat commit 03622f2

Used in 7 other repositories

We found 16 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 7 other GitHub owners. This page covers the copy in ThibautBaissac/rails_ai_agents, 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
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Postgres Patterns this skillThibautBaissac/rails_ai_agents	665	7 repos	~922	Automated safety check: Pass	MIT	4 mo ago
Performancekid-sid/claude-spellbook	189	—	~3.8k	Automated safety check: Pass	MIT	2 mo ago
Postgresqlkid-sid/claude-spellbook	189	—	~3.7k	Automated safety check: Pass	MIT	2 mo ago
Supabase Postgres Best Practicessupabase/agent-skills	2.7k	24 repos	~808	Automated safety check: Pass	MIT	5 days ago
DB SculptorEliasOulkadi/shokunin	114	—	~3.1k	Automated safety check: Notes	MIT	3 days ago
Database Domain Specialistmodu-ai/moai-adk	1.2k	—	~2.8k	Automated safety check: Pass	Apache-2.0	today

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Works with

PostgreSQL

Questions about Postgres Patterns

What does Postgres Patterns do?

PostgreSQL database patterns for query optimization, schema design, indexing, and security. Postgres Patterns is an agent skill from ThibautBaissac/rails_ai_agents. PostgreSQL database patterns for query optimization, schema design, indexing, and security.

When should I use Postgres Patterns?

Postgres Patterns fits situations like: tasks that involve Query optimization; tasks that involve Database schema design.

How do I install Postgres Patterns in Claude Code?

Run `npx skills add ThibautBaissac/rails_ai_agents --skill postgres-patterns -a claude-code`. Or copy the skill folder (.agents/skills/postgres-patterns in ThibautBaissac/rails_ai_agents) 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 ThibautBaissac/rails_ai_agents --skill postgres-patterns -a codex`. Or copy the skill folder (.agents/skills/postgres-patterns in ThibautBaissac/rails_ai_agents) 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 ThibautBaissac/rails_ai_agents --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 922 tokens (SKILL.md is roughly 3.7k 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: Performance (kid-sid/claude-spellbook, 189 stars), Postgresql (kid-sid/claude-spellbook, 189 stars), Supabase Postgres Best Practices (supabase/agent-skills, 2.7k stars) and DB Sculptor (EliasOulkadi/shokunin, 114 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Postgres Patterns?

ThibautBaissac (a GitHub user) maintains it in ThibautBaissac/rails_ai_agents, which has 665 GitHub stars. The repository holds 19 skills in this directory. The repository was last updated on June 1, 2026.

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

Install Postgres Patterns

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

PostgreSQL Patterns

When to Activate

Quick Reference

Index Cheat Sheet

Data Type Quick Reference

Common Patterns

Anti-Pattern Detection

Configuration Template

Related

Files

Used in 7 other repositories

Compare with similar skills

Similar skills

More from ThibautBaissac/rails_ai_agents

Related

Questions about Postgres Patterns