Programming Tutorials

  There is a specific, maddening silence that occurs only in production environments. You have built a reactive dashboard or a chat application using Supabase. On   localhost:3000 , data flows instantly. You open two browser windows, update a row in one, and the other updates via WebSocket immediately. Then you deploy to Vercel, Netlify, or AWS. You trigger an update. The database records the change, but the UI remains stale. The WebSocket connection seems open, but the payload never arrives. This is rarely a bug in the Supabase SDK. It is almost always a configuration mismatch between the default PostgreSQL settings and the strict requirements of Logical Replication in a production environment. Here is why your subscriptions are failing and how to fix them with production-grade rigor. The Architecture of "Realtime" To debug this effectively, you must understand the underlying mechanics. Supabase Realtime is not a simple polling mechanism. It relies on PostgreSQL's  Write...