Backend: Add routes-f idempotency key handler

[davedumto]

Summary

Add a Routes-F idempotency key handler for POST endpoints.

Requirements

• Read Idempotency-Key header.
• Cache response for a short TTL.
• Return cached response for duplicate requests.

Notes

• Implement for routes-f create/import endpoints.

Acceptance Criteria

• Duplicate request returns identical body/status.
• Tests cover idempotent behavior.

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[shaaibu7]

@shaaibu7 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Can i work on this?

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[EbukaMoses]

@EbukaMoses has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello Maintainer,

I’d like to apply to work on this issue.

I’m Ebuka Moses, a full-stack and blockchain developer with experience building, testing, and maintaining smart contracts, particularly using Rust and blockchain-based architectures. I’m comfortable working with contract logic, validation, access control, persistent storage, and event handling, and I always pay close attention to correctness, security, and edge cases.

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Thank you for your consideration, and I look forward to contributing.

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[okekefrancis112]

@okekefrancis112 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi, I would like to apply to this issue. I’m a full-stack smart contract and backend engineer with experience building and integrating production systems across web2 and web3. I work with NestJS, Node.js, TypeScript, and SQL/NoSQL databases to design clean, scalable APIs, and I’ve also built and integrated smart contracts, including working with Soroban on Stellar to manage contract state, construct transactions, and connect on-chain logic with backend services. I’m comfortable navigating existing codebases, following established project patterns, and contributing well-documented, testable changes that are easy to review and maintain in an open source environment.

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[codebestia]

@codebestia has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello Maintainer
Can i work on this?

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Congratulations, @codebestia! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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