Backend Queries

Write secure, optimized database queries using parameterized statements, eager loading, and strategic indexing to prevent SQL injection and N+1 problems. Use this skill when writing database queries using ORMs like SQLModel, SQLAlchemy, Django ORM, or raw SQL queries. Use when implementing data fetching logic, query filters, joins, aggregations, pagination, or transaction handling. Use when working with repository patterns, data access layers, service layer queries, or any code that retrieves or manipulates data from databases. Use when optimizing query performance, preventing N+1 queries, or implementing eager loading strategies.