https://beyondcrud.devFree system design for developers: caching, queues, databases, scaling, failures and AI in production, plus teardowns of new apps, the AI tools and the open source alternatives worth knowing.https://beyondcrud.dev/writing/postgres-create-index-concurrently/https://beyondcrud.dev/writing/postgres-create-index-concurrently/Wed, 21 Oct 2026 00:00:00 GMTCREATE INDEX vs CREATE INDEX CONCURRENTLY in Postgres, and the four things that bite people when they switch.https://beyondcrud.dev/writing/ai-agents-and-your-api/https://beyondcrud.dev/writing/ai-agents-and-your-api/Tue, 20 Oct 2026 00:00:00 GMTA human gives up after two refreshes. An agent doesn't. Four things I'd ship on any API that agents will call.https://beyondcrud.dev/writing/how-dead-letter-exchanges-prevent/https://beyondcrud.dev/writing/how-dead-letter-exchanges-prevent/Wed, 29 Jul 2026 00:00:00 GMTOne bad payment event can keep thousands of healthy events waiting. The interesting part is not what a DLX is - it is deciding which failures should leave the hot path, and what happens after they do.