Agent Skills: active-record-db

This skill should be used when the user asks about Active Record models, database migrations, queries, associations (belongs_to, has_many, has_one, has_and_belongs_to_many), validations, callbacks, scopes, database schema design, SQL optimization, N+1 queries, eager loading, joins, or database-specific features (PostgreSQL, MySQL, SQLite). Also use when discussing ORM patterns, data modeling, or database best practices. Examples: