Implement deadline/expiry enforcement for all time-sensitive operations

[Smartdevs17]

Context

Time-sensitive operations (flash loans, auctions, proposals) need expiry enforcement to prevent stale execution.

Current Limitation/Problem

Some time-sensitive operations lack deadline enforcement. Stale transactions can be executed at unfavorable times.

Expected Outcome

All time-sensitive contract functions enforce deadlines/expiry with clear error messages on expiry.

Acceptance Criteria

• Flash loans: execute within 1 block or revert
• Auctions: bids accepted only during auction period
• Governance proposals: voting period enforced, execution window enforced
• Timelock operations: enforce delay and execution window
• Liquidation: ensure liquidation uses current (not stale) prices
• Signature-based operations: enforce expiry timestamp
• Common pattern: reusable deadline modifier/library
• Gas overhead: < 1000 gas per deadline check
• Test suite: all deadline scenarios tested

Technical Scope

• Files: contracts/shared-deadline/, contracts/*/src/operations.rs
• Impact: Flash loan, auction, governance, liquidation contracts
• Testing: Time manipulation tests for deadline enforcement

[PeterGado]

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

Good day Maintainer. I would love to work on this issue on your behalf. Please assign it to me. Thank you

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[Kayce10]

@Kayce10 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Maintainer,

Please I’d love to take this issue on. I’m a smart contract and full-stack developer with experience across OnlyDust, Drips Waves

My stack includes Rust, Soroban,

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[smog123]

@smog123 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello maintainer i will love to if i can work on this project.

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[Osifowora]

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

​Hi maintainer, I would love to work on this issue. I can get started on it right away.

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[UFObject247]

@UFObject247 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, I’m a full stack developer with hands-on experience building with variety of tools including Nextjs, nodejs, nestjs, React, Typescript and more

I focus on writing clear, maintainable code and making sure features work as expected end to end, not just in isolation. I communicate progress regularly and keep things transparent as I work. I’m confident I can complete this task within an ETA of 12 HOURS

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

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[drips-wave]

This issue has been completed by @PeterGado as part of the Stellar Wave Program's 6th Wave 🥳

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