WhatsApp Bot Deploy Failed Not From Networking Bug but a Slow DB Boot Timeout

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A developer building a WhatsApp order bot for small businesses faced repeated Railway deployment failures the night before a client demo. Every deploy was killed by Railway's healthcheck, with no visible app-level error, leading to an initial assumption of a Docker networking or port-binding issue. After hours of chasing the wrong cause, the real culprit turned out to be the app's PostgreSQL connection on cold start exceeding Railway's default 30-second healthcheck window. The fix required simply extending the healthcheck timeout to match the app's actual boot duration, not any code change. To prevent a recurrence, the developer added Sentry distributed tracing around the database boot sequence, enabling automatic detection of slow-start anomalies that would have cut the debugging session from hours to minutes.

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