<?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.9"><url><loc>https://systemdr.systemdrd.com/p/indexes-b-tree-hash-composite-covering</loc><news:news><news:publication><news:name>System Design Interview Roadmap</news:name><news:language>en</news:language></news:publication><news:publication_date>2026-10-18T03:30:49+00:00</news:publication_date><news:title>Indexes: B-Tree, Hash, Composite, Covering</news:title></news:news></url><url><loc>https://systemdr.systemdrd.com/p/ai-gateway-patterns-rate-limiting</loc><news:news><news:publication><news:name>System Design Interview Roadmap</news:name><news:language>en</news:language></news:publication><news:publication_date>2026-10-16T04:10:35+00:00</news:publication_date><news:title>AI Gateway Patterns: Rate Limiting and Cost Control for LLM APIs</news:title></news:news></url></urlset>