Solo developer's SaaS feature silently failed for 4 weeks after API model ID retired

A solo developer running brevio.news, a personalised AI news brief service, discovered that its weekly summary feature had stopped working for four weeks after a hosted LLM provider retired the model ID his app relied on. The API returned 404 errors, but the job appeared to complete successfully each Sunday because the errors were silently swallowed, leaving the dashboard frozen on the last valid brief. With no alert designed to detect absence of output rather than active errors, the failure went unnoticed until the developer stumbled upon it while working on an unrelated task. He resolved the issue in a single Sunday by migrating the weekly brief to a locally running Qwen model on his Mac Studio M4 Max, eliminating the external API dependency entirely. The incident highlighted two key lessons: hosted model IDs can be deprecated without warning, and monitoring systems must be designed to detect missing outputs, not just error events.