backend-queries

Write efficient, secure database queries using parameterized queries, eager loading, and performance optimizations. Use this skill when writing database queries, implementing data retrieval logic, using ORM query builders, writing raw SQL queries, implementing eager loading or joins, preventing N+1 query problems, implementing query filters or search functionality, using transactions for data consistency, implementing pagination queries, optimizing slow queries, implementing query caching, working with query builder methods, or writing repository/DAO layer code. Use when working with SQL queries, ORM query builders like Sequelize, TypeORM, Prisma, SQLAlchemy, ActiveRecord, Django ORM query APIs, or raw database access code.