Developer Uses Sentry to Uncover Silent Data-Loss Bug That Never Threw an Error

A developer building Aether Canvas, a local-first Electron app created during OpenAI Build Week, discovered a serious data-loss bug that produced no crashes, exceptions, or error logs. The bug stemmed from a race condition in how the app managed its workspace index file, where two concurrent read-modify-write operations could each succeed while one silently overwrote the other. Because each individual JSON file write was atomic, standard error monitoring had nothing to flag, leaving affected workspaces stranded on disk but unreachable within the app. The developer used Sentry to instrument and expose the flaw, working from a preserved copy of the original hackathon submission to maintain a clean before-state for debugging. The case highlights a key distinction: a successful operation confirms a task completed, but not that its result remains intact afterward.
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