BA-038 — Validate and normalize user preference payloads

[MaryammAli]

• Type: Bug Fix
• Affected area: src/users/users.service.ts, preference DTOs
• BackendAcademy
• Summary: Arbitrary records allow invalid types, oversized values, and unexpected preference keys.
• Acceptance criteria: Supported keys and value types are allow-listed, bounded, normalized, and covered by DTO tests.

[hauwauyahass-byte]

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[Chaampion1-1]

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[TechBroAfrica]

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[Wiseman52]

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[egwujiohaifesinachiperpetual-max]

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Please assign
ETA is 4 hours

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[toroabduljalalyakubu]

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

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

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@toroabduljalalyakubu's PR #751 was approved and merged by @Nabeelahh.

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