https://compcodesolutions.com/blog Notes from shipping AI systems and the infrastructure they run on. en-gb https://compcodesolutions.com/blog/migration-isnt-done-when-the-app-responds/ https://compcodesolutions.com/blog/migration-isnt-done-when-the-app-responds/ Thu, 20 Aug 2026 12:00:00 GMT Teams declare a migration finished the moment the service returns 200. That's the point where the interesting work starts. Here's what proving it actually took, and the three things it found. https://compcodesolutions.com/blog/access-control-before-retrieval https://compcodesolutions.com/blog/access-control-before-retrieval Sun, 16 Aug 2026 12:00:00 GMT Most RAG implementations retrieve first and filter by permission afterwards. That leaks more than it looks like it does. Here's the failure, the fix, and the code. https://compcodesolutions.com/blog/four-containers-named-postgres https://compcodesolutions.com/blog/four-containers-named-postgres Thu, 13 Aug 2026 12:00:00 GMT I spent a day making my infrastructure reproducible from git. It found four bugs that had been running in production for months — including one where an app was silently connecting to the wrong database. https://compcodesolutions.com/blog/railway-to-vps https://compcodesolutions.com/blog/railway-to-vps Thu, 13 Aug 2026 00:00:00 GMT A real migration from Railway to a Contabo VPS running Coolify — the numbers, the provider that rejected me, and what I gave up to save $25 a month.