Observed Signal · Aug 11, 2026 · Incident Report · Source: DEV Community · Impact: 1/5 · Sentiment: Neutral
Stuck Postgres Lock Caused Site Outage; One-Line Fix
A developer's site returned HTTP 500 on every request due to a Postgres lock timeout (error 55P03) occurring while a background worker tried to create a pg-boss queue during process boot. Because the worker boot was awaited inside a Next.js instrumentation hook, the worker failure aborted the whole server. The immediate recovery was to restart Postgres and redeploy; the long-term fix was to start the worker in a fire-and-forget fashion and add a resilient retry loop that only marks the worker as started after a successful boot.
Technical postmortem about application resilience and background-worker boot patterns; useful operational guidance but limited direct impact on the wider AdTech/MarTech industry.
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Key Takeaways & Evidence Grounding
- Site-wide HTTP 500 errors were caused by Postgres lock timeouts (error code 55P03) when pg-boss attempted to insert index tuples into the queue table.
- The worker boot was awaited inside a Next.js instrumentation hook, causing a worker failure to abort the entire web server during startup.
- Immediate recovery required restarting Postgres to clear the stuck lock; redeploying the app alone did not resolve the lock.
- Long-term fixes: change worker boot to fire-and-forget with .catch to avoid aborting the web server, and implement a retry loop that only marks the worker as started after successful boss.start().
Connected Companies & Entities
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Ontology Mapping & Concepts
Related Market Signals & Shifts
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