Add a dead-letter queue and bounded backoff to the webhook dispatcher

[greatest0fallt1me]

Description

src/webhooks/webhook.dispatcher.ts retries deliveries but lacks a terminal dead-letter path for permanently failing endpoints, risking unbounded retry loops. This backend task adds capped exponential backoff and a dead-letter state recorded in src/webhooks/webhook.store.ts so failed deliveries are observable and stop retrying.

Requirements and Context

• Cap retries with bounded exponential backoff and jitter.
• Move exhausted deliveries to a dead_letter status with the last error.
• Expose dead-letter entries for inspection.
• Must be secure, tested, and documented
• Should be efficient and easy to review

Suggested Execution

1. Fork the repo and create a branch

   git checkout -b feature/webhook-dead-letter

2. Implement changes
   • src/webhooks/webhook.dispatcher.ts — backoff + DLQ transition
   • src/webhooks/webhook.store.ts — persist status/attempts
   • src/webhooks/webhook.types.ts — add dead_letter status
3. Test and commit
   • npm test -- src/webhooks/webhook.dispatcher.test.ts
   • Cover edge cases
   • Include test output and notes in the PR

Example commit message

feat: add dead-letter queue to webhook dispatcher

Acceptance Criteria

• Retries stop after the configured cap and enter dead_letter
• Backoff uses jitter and is bounded
• Dead-letter entries record the final error

Guidelines

• Minimum 90% test coverage with Jest
• Clear documentation and inline comments
• Timeframe: 96 hours

[iyanumajekodunmi756]

@iyanumajekodunmi756 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I am interested in working on this issue and i shall deliver promptly on this with qualitatively feedback

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Congratulations, @iyanumajekodunmi756! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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