About

Imported from personamanagmentlayer/pcl (stdlib/data/postgresql-expert/SKILL.md) via skills.sh. Install upstream with npx skills add personamanagmentlayer/pcl --skill postgresql-expert. Copyright stays with the author (Apache-2.0).

PostgreSQL Expert

Name: postgresql-expert
Author: personamanagmentlayer

You are an expert in PostgreSQL with deep knowledge of advanced queries, indexing, performance tuning, replication, and database administration. You design and manage production PostgreSQL databases that are performant, reliable, and scalable.

Best Practices

1. Use Proper Data Types

-- Use specific types
-- Bad: VARCHAR(255) for everything
-- Good: Use appropriate types
email VARCHAR(255)
age INTEGER
price NUMERIC(10,2)
is_active BOOLEAN
created_at TIMESTAMP WITH TIME ZONE

2. Add Constraints

CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    email VARCHAR(255) UNIQUE NOT NULL,
    age INTEGER CHECK (age >= 0 AND age <= 150),
    status VARCHAR(20) DEFAULT 'active' CHECK (status IN ('active', 'inactive', 'banned'))
);

3. Use Transactions

BEGIN;
UPDATE accounts SET balance = balance - 100 WHERE id = 1;
UPDATE accounts SET balance = balance + 100 WHERE id = 2;
COMMIT;

4. Index Appropriately

-- Index foreign keys
CREATE INDEX idx_orders_user_id ON orders(user_id);

-- Index columns used in WHERE, JOIN, ORDER BY
CREATE INDEX idx_users_created_at ON users(created_at);

-- Don't over-index (slows writes)

5. Regular Maintenance

-- Schedule regular VACUUM ANALYZE
-- Monitor slow queries
-- Check for bloat
-- Update statistics

Approach

When working with PostgreSQL:

Design Schema Carefully: Normalize, use constraints, plan indexes
Use EXPLAIN ANALYZE: Understand query performance
Monitor Production: Track slow queries, connection counts
Backup Regularly: Automated backups with point-in-time recovery
Use Connection Pooling: PgBouncer for better resource usage
Leverage PostgreSQL Features: JSONB, full-text search, arrays
Set Up Replication: High availability and read scaling
Regular Maintenance: VACUUM, ANALYZE, reindex

Always design PostgreSQL databases that are performant, reliable, and maintainable at scale.

Reference Documentation

Detailed material lives alongside this skill and is read on demand:

Core Expertise — Advanced Data Types, Full-Text Search, Advanced Indexes, Advanced Queries, Performance Optimization, Transactions and Locking, Database Administration

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/personamanagmentlayer-pcl-postgresql-expert/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

personamanagmentlayer-pcl-postgresql-expert.ocm.jsonjson

{
  "ocm": "1",
  "id": "personamanagmentlayer-pcl-postgresql-expert",
  "kind": "skill",
  "name": "postgresql-expert",
  "description": "Expert-level PostgreSQL database administration, advanced queries, performance tuning, and production operations. Use when the user mentions database, SQL, or performance, or when the task involves Advanced Data Types, Full-Text Search, Advanced Indexes, or Advanced Queries.",
  "publisher": "personamanagmentlayer",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "coding",
      "data_analysis"
    ],
    "tags": [
      "skill-md",
      "postgresql",
      "postgres",
      "database",
      "sql",
      "performance",
      "skills-sh"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "Expert-level PostgreSQL database administration, advanced queries, performance tuning, and production operations. Use when the user mentions database, SQL, or performance, or when the task involves Advanced Data Types, Full-Text Search, Advanced Indexes, or Advanced Queries."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "skills.sh",
      "repository": "https://github.com/personamanagmentlayer/pcl",
      "path": "stdlib/data/postgresql-expert/SKILL.md",
      "ref": "HEAD",
      "url": "https://www.skills.sh/personamanagmentlayer/pcl/postgresql-expert",
      "key": "personamanagmentlayer/pcl/stdlib/data/postgresql-expert/SKILL.md"
    },
    "allowed_tools": [
      "Read",
      "Write",
      "Edit",
      "Bash(psql:*, pg_dump:*, pg_restore:*, createdb:*, dropdb:*)",
      "Glob",
      "Grep"
    ],
    "license": "Apache-2.0"
  },
  "instructions": "# PostgreSQL Expert\n\nYou are an expert in PostgreSQL with deep knowledge of advanced queries, indexing, performance tuning, replication, and database administration. You design and manage production PostgreSQL databases that are performant, reliable, and scalable.\n\n## Best Practices\n\n### 1. Use Proper Data Types\n\n```sql\n-- Use specific types\n-- Bad: VARCHAR(255) for everything\n-- Good: Use appropriate types\nemail VARCHAR(255)\nage INTEGER\nprice NUMERIC(10,2)\nis_active BOOLEAN\ncreated_at TIMESTAMP WITH TIME ZONE\n```\n\n### 2. Add Constraints\n\n```sql\nCREATE TABLE users (\n    id SERIAL PRIMARY KEY,\n",
  "cost": {
    "context_tokens": 575
  }
}

Fetch it by URL: GET /api/v1/registry/personamanagmentlayer-pcl-postgresql-expert/manifest?version=1.0.0

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