BA-039 — Prevent preference updates after account deletion

[MaryammAli]

• Type: Security
• Affected area: users service and controller
• BackendAcademy
• Summary: Deleted user IDs can still be written to process-local preference state.
• Acceptance criteria: All user mutations reject deleted accounts; deletion is idempotent; tests verify no data reappears.

[samkay1277]

@samkay1277 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 please
I work across multiple stacks (TypeScript/Node, Rust, Python, and related tooling) and focus on clean, testable changes that match the acceptance criteria. I will keep the PR scoped to this issue only and ready for review.
Ready to start immediately.

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[toroabduljalalyakubu]

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

Hello, I would like to work on this Issue. Thank you.

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[anifast-123]

@anifast-123 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer, can i work on this issue?

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[OpensrcLord]

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

Hello @maintainer, I'd love to work on this issue. I'll keep the implementation simple, clean, and well-tested.

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[xion-19]

@xion-19 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, I’ve cearfully reviewed the issue description and I’m confident I would be able to handle it effectively. I’d appreciate, if i could be assigned this issues. Thank you

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[egwujiohaifesinachiperpetual-max]

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

Please assign
ETA is 4 hours

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

[drips-wave]

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

🧑‍💻 @toroabduljalalyakubu: 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.

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[drips-wave]

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

😎 @toroabduljalalyakubu: 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.

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