Agent Skills: ekoen-backend-sql-performance-review

Review skill for eKoEN backend database-access performance. Use when asked to review, audit, inspect, or harden TypeScript backend changes that touch MikroORM, repositories, services, controllers, cron jobs, or SQL-facing logic, especially to catch N+1 queries, per-item lookups inside loops, repeated findOne/find patterns, wasteful hydration, duplicate reads, broad populate usage, app-side filtering of large result sets, or raw SQL escapes before merge.