Add webhook delivery exactly-once semantics via consumer-side dedupe receipts

[thlpkee20-wq]

Description

Webhook receivers can receive duplicates under retry. Provide a dedupe-receipt contract: each delivery carries a stable delivery_id and the consumer can POST /api/v1/webhooks/ack to confirm; subsequent retries are suppressed.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Relevant code: src/routes/webhooks.ts
• Ack TTL must be at least 7 days

Suggested execution

• Fork the repo and create a branch
• git checkout -b feat/webhook-exactly-once-acks
• Implement changes
  • Persist webhook_acks(delivery_id, acked_at)
  • Skip retries when delivery_id already acked
  • Document ack contract in OpenAPI
• Validate security and correctness assumptions

Test and commit

• Run tests
  • npm test
• Cover edge cases
  • Ack arriving after retry already sent must short-circuit next retry
• Include test output and notes

Example commit message

feat: webhook exactly-once via consumer acks

Guidelines

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 96 hours

[Emmzyemms]

@Emmzyemms has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I’m interested in contributing to this issue and believe I can deliver a clean, well-tested solution that aligns with the project’s standards.

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

[Zainab5970]

@Zainab5970 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

please can i work on the issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Zainab5970 to this issue.