[backend] Fix Webhook Retry: Implement Exponential Backoff with Jitter

[ExcelDsigN-tech]

[backend] Fix Webhook Retry: Implement Exponential Backoff with Jitter

Description: Webhook retry processor in backend/src/services/webhookRetryProcessor.ts uses fixed intervals. Causes thundering herd on recovery, overwhelms downstream services.

Impact: Cascading failures; webhook delivery delays; downstream service overload.

Suggested Fix:

1. Implement exponential backoff: min(2^attempt * base + jitter, max)
2. Add jitter: random(0, 2^attempt * base * 0.1)
3. Configurable: base=30s, max=1hr, max_attempts=10
4. Add dead letter queue for permanently failed webhooks
5. Metrics: retry count, latency, success rate per endpoint

Points: 200
Type: bug

Definition of Done

• Exponential backoff with jitter implemented
• Configurable parameters (base, max, max_attempts)
• Dead letter queue for failed webhooks
• Metrics dashboard for retry behavior
• No regression introduced
• All necessary CI checks passed

---

📋 Before working on this issue, please read our Contributing Guidelines — it covers branching, commits, PR standards, testing, and style guides.

Join our Telegram community to connect with other contributors, ask questions, and stay updated:

💬 Telegram: https://t.me/+eRqhka27TVo0NzM8

All official decisions, reviews, and coordination happen right here on GitHub. The Telegram group is a space for informal discussion and peer support.

[Rufai-Ahmed]

@Rufai-Ahmed has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I'd love to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Rufai-Ahmed to this issue.

[cctass]

@cctass has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi! I’d like to work on this issue if it’s still available.

I have experience building web applications with React, Next.js, and NestJS, and I’m comfortable working with Git and collaborative development workflows. I’m confident I can implement a clean, maintainable solution while following the project’s contribution guidelines.

If the issue is still unassigned, I’d be happy to take ownership of it and submit a pull request within the next 24 hours. Thank you for your time and consideration!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @cctass to this issue.

[ekomdavid86-cell]

@ekomdavid86-cell has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

i have reviewed this issue and would like to solve it

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ekomdavid86-cell to this issue.

[KingFRANKHOOD]

@KingFRANKHOOD has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

i will love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @KingFRANKHOOD to this issue.

[drips-wave]

Congratulations, @KingFRANKHOOD! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @KingFRANKHOOD: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @KingFRANKHOOD as part of the Stellar Wave Program's 8th Wave 🥳

😎 @KingFRANKHOOD: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.