Duplicate webhook processing

Webhook deliveries begin duplicating after the service has handled a few requests. The queue is healthy and each provider event arrives once, but the process count keeps climbing.

Initial failing signalThe second webhook is processed twiceExpected behavior: Processing is called once for each delivered event: [evt-1, evt-2]. · actual behavior: Processing is called [evt-1, evt-2, evt-2], so evt-2 is processed twice.

Progress

1Reproduce the bugRun checks

2Edit the fixOpen

3Pass checksOpen

4Submit fixOpen

Reproduction Steps

Run npm test.
Compare one delivery with several sequential deliveries in the same process.
Trace listener registration and cleanup across handler calls.
Correct the lifecycle without suppressing legitimate events.

Focus Mode

Start

src/webhook-service.mjs
tests/webhook-service.test.mjs

Likely area

src/webhook-service.mjs

Repo scale

4 files
Small event-driven service

Challenge Coach

Hints reveal broad direction first, then narrow toward the suspect path without showing hidden tests or exact solution code.

TopicEvents & Concurrency

DifficultyMedium

Est. time20 min

Workspacepreparing

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Evidence Map

Failing signal loaded from challenge API
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workspace

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