fix(backend): stop swallowing errors in judge enqueue, worker, and startup

[devin-ai-integration]

Summary

Review of backend error handling surfaced a few places where errors were silently swallowed or lost. This fixes the ones with real diagnostic/operational impact.

1. Judge enqueue failures were completely swallowed (problems.service.ts, runCode + submitCode). The catch {} discarded the underlying BullMQ/Redis error, so a broken queue only ever showed up as a generic 503 with no log. Worse, the compensating DB update ran unguarded inside the catch — if it threw, the intended JUDGE_UNAVAILABLE (503) got replaced by an opaque 500 and the real cause was hidden twice over.

} catch (error) {
  console.error("Failed to enqueue judge run job", { runId: run.id, error });
  try {
    await prisma.codeRun.update({ ... status: "internal_error" ... });
  } catch (updateError) {
    console.error("Failed to mark code run as internal_error", { runId: run.id, error: updateError });
  }
  throw new AppError(503, "JUDGE_UNAVAILABLE", "The judge is temporarily unavailable.");
}

Client contract is unchanged (still 503 JUDGE_UNAVAILABLE); the difference is the root cause is now logged and the compensating write can't mask it.

2. Worker internal-error persistence could mask the real judge error (judge/queue/worker.ts). In processJudgeJob's catch, await persistInternalError(...) ran unguarded before throw error — a persistence failure would throw and replace the original judge error that BullMQ needs to see. Wrapped it so the original error is always the one propagated.

3. Startup rejection was discarded (server.ts). void bootstrap() dropped any rejection (e.g. ensureImagesUploadDir failing) into a silent unhandled rejection. Now it logs and exits non-zero. Also added unhandledRejection / uncaughtException logging so nothing dies silently.

4. Worker had no error listener (worker.ts). Added worker.on("error", ...) plus the same process-level handlers so BullMQ connection errors are surfaced instead of vanishing.

No behavior change to the HTTP API contract; these only add logging/propagation and harden compensating paths.

Link to Devin session: https://app.devin.ai/sessions/6df705df29f24a919acaf6460fa38e6a
Requested by: @CyberStill-GmbH

[devin-ai-integration]

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Project	Deployment	Actions	Updated (UTC)
codenix	Ready	Preview, Comment	Jul 11, 2026 2:00am