a5c-ai/postgresql

PostgreSQL Skill

Expert assistance for PostgreSQL database design and optimization.

Capabilities

• Design optimal schemas
• Create performant indexes
• Implement full-text search
• Work with JSONB data
• Optimize query performance
• Configure replication

Indexing Patterns

-- B-tree for equality and range
CREATE INDEX idx_users_email ON users(email);

-- GIN for JSONB and arrays
CREATE INDEX idx_posts_tags ON posts USING GIN(tags);

-- Full-text search
CREATE INDEX idx_posts_search ON posts USING GIN(to_tsvector('english', title || ' ' || content));

-- Partial index
CREATE INDEX idx_active_users ON users(created_at) WHERE active = true;

JSONB Operations

-- Query JSONB
SELECT * FROM users WHERE metadata->>'role' = 'admin';

-- Update JSONB
UPDATE users SET metadata = metadata || '{"verified": true}'::jsonb WHERE id = 1;

Target Processes

• database-design
• performance-optimization
• backend-development