https://www.zaidfolio.space/notes Notes on backend systems, multi-tenant SaaS, auth, and AI products. en https://www.zaidfolio.space/notes/postgres-rls-multi-tenancy https://www.zaidfolio.space/notes/postgres-rls-multi-tenancy Every multi-tenant app trusts developers to remember tenant_id on every query. Here's how to make Postgres enforce it instead, in about 15 lines of SQL. Sun, 11 Oct 2026 00:00:00 GMT Backend Security https://www.zaidfolio.space/notes/rag-ingestion-pipeline https://www.zaidfolio.space/notes/rag-ingestion-pipeline Chat-with-your-docs is magic with a 2-page file and falls apart with a real one. The fix isn't a better model; it's the boring pipeline around it. Fri, 09 Oct 2026 00:00:00 GMT AI Backend