QueryGuard

QueryGuard is a web app (with optional CLI) that reviews SQL changes in pull requests and flags performance and safety risks before they ship. It connects to your repo and your staging database, runs static analysis plus lightweight EXPLAIN plans, and comments directly on PRs with concrete fixes (missing indexes, dangerous full-table scans, N+1 patterns, lock escalation risks, non-sargable predicates, and query plan regressions). It also enforces team rules (no SELECT *, required LIMITs in admin queries, banned functions, required tenant filters) and keeps an audit trail of approved exceptions. This is a combination traditional + AI app: deterministic checks handle the obvious, while an LLM explains issues in plain English and suggests rewrites tailored to your schema. It’s not a magic optimizer; it’s a guardrail that reduces outages caused by “one bad query.”