db-skills

Audits database data quality (nulls, duplicates, orphans, invalid ranges) and produces a short findings report with remediation queries. Use when debugging data issues, validating migrations, or verifying analytics correctness.

Diagnoses and fixes slow database queries using explain plans, statistics, and targeted indexes or rewrites. Use when an endpoint is slow, a query regresses, cpu spikes, or timeouts appear.

Inspects database schema and metadata (tables, columns, indexes, constraints, relationships). Use when exploring an unfamiliar database, writing joins, debugging query behavior, or documenting schema.

Plans and executes safe database migrations with low-downtime patterns, verification, and rollback. Use when changing schema, backfilling data, adding constraints, or creating indexes in production.