PostgreSQL Administration Skill

Atomic skill for database security and maintenance

Overview

Production-ready patterns for role management, security hardening, and routine maintenance.

Prerequisites

• PostgreSQL 16+
• Superuser or role management privileges

Parameters

parameters:
  operation:
    type: string
    required: true
    enum: [create_role, grant, revoke, audit, maintain]
  role_name:
    type: string
    pattern: "^[a-z][a-z0-9_]*$"

Quick Reference

Role Creation

CREATE ROLE app_user WITH LOGIN PASSWORD 'secure' CONNECTION LIMIT 100;
CREATE ROLE readonly_role;
GRANT SELECT ON ALL TABLES IN SCHEMA app TO readonly_role;

Security Hardening

REVOKE ALL ON SCHEMA public FROM PUBLIC;
ALTER TABLE data ENABLE ROW LEVEL SECURITY;
CREATE POLICY isolation ON data USING (tenant_id = current_setting('app.tenant')::uuid);

Maintenance

ANALYZE VERBOSE table_name;
VACUUM (VERBOSE, ANALYZE) table_name;
REINDEX INDEX CONCURRENTLY idx_name;

Security Audit

SELECT rolname FROM pg_roles WHERE rolsuper;  -- Superusers
SELECT * FROM information_schema.table_privileges WHERE grantee = 'PUBLIC';

Troubleshooting

Error	Cause	Solution
42501	Permission denied	Check GRANTs
28P01	Auth failed	Reset password
55P03	Lock unavailable	Kill blocker

Usage

Skill("postgresql-admin")