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ArbNet Dev Fixes Crypto App Outage Caused by Expired Cloud Database Subscription

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ArbNet, an automated crypto arbitrage tracker built on ASP.NET Core and React, went fully offline after its Railway cloud trial expired, cutting off access to its hosted PostgreSQL database. The failure manifested as a System.InvalidOperationException on the backend and broken API calls on the frontend. Developers used Sentry's real-time telemetry — including breadcrumbs and stack traces — alongside Google's Gemini AI to pinpoint the root causes. The fix involved migrating to a local PostgreSQL instance, updating connection strings and environment variables, and reconfiguring CORS policies in the .NET backend. All changes were committed to a dedicated bugfix branch and submitted via a GitHub pull request.

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