[Mike] 17. Event idempotency guarantees

[mikewheeleer]

Implement Event idempotency guarantees

Description

Prevent duplicate event processing with idempotency keys.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Repository scope: Talenttrust/Talenttrust-Backend only
• Keep implementation aligned with existing project architecture and coding standards

Suggested execution

• Fork the repo and create a branch
• git checkout -b feature/backend-17-event-idempotency-guarantees
• Implement changes
  • Write code in: src/index.ts and modularized src/* files for prevent duplicate event processing with idempotency keys.
  • Write comprehensive tests: src/**/*.test.ts with integration and unit suites
  • Add documentation: README.md and docs/backend/
  • Include NatSpec-style comments where applicable (or equivalent structured doc comments)
  • Validate security assumptions and threat scenarios

Test and commit

• Run tests
• Cover edge cases and failure paths
• Include test output and security notes

Example commit message

feat: implement event idempotency guarantees with tests and docs

Guidelines

• Minimum 95 percent test coverage for impacted modules
• Clear documentation with reviewer-focused structure
• Timeframe: 96 hours

[AbilityTechy]

@AbilityTechy has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi @Talenttrust, I’d like to be assigned to this issue. I can implement the event idempotency guarantees by introducing a robust tracking layer to prevent duplicate processing. I'll focus on using unique idempotency keys within the database to ensure "exactly-once" execution and will provide comprehensive integration tests to verify the behavior under retry scenarios.

ETA: 48 hours

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

[drips-wave]

Congratulations, @AbilityTechy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @AbilityTechy: 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 marked as completed by a Drips Wave moderator for @AbilityTechy as part of the Stellar Wave Program's 3rd Wave 🥳

Moderator's reason: [Auto-assessed] The contributor successfully implemented the event idempotency middleware as requested in issue #67. PR #145 provides a functional implementation with an in-memory store, response interception, and comprehensive unit tests, and it has been merged by the maintainers.

😎 @AbilityTechy: 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.

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

ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.