Add lesson 31: Query optimization#91
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Part of #6 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds Query optimization (roadmap item
04-query-optimization) — Module 7: Performance & indexing.Summary
Give the cost-based planner good statistics and sargable predicates — and fix the anti-patterns that quietly disable your indexes.
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query-returnscheck (extended-stats-created) — the learner creates extended statistics (CREATE STATISTICS) to fix a correlated-columns underestimate, verified via pg_statistic_ext.Verified end-to-end against a non-superuser Postgres 16.
npm run lessons:validate(34/34) andnext buildboth pass.Part of #6
🤖 Generated with Claude Code