`common_types::storage_version` — version migration logic needs end-to-end test

[Nabeelahh]

• Area: Smart Contract
• Description: storage_version.rs provides version-gate helpers for storage layout migrations, but there are no tests in test_contract.rs that exercise an actual version bump and confirm old data is correctly migrated or rejected.
• File(s): contracts/common_types/src/storage_version.rs, contracts/common_types/src/test_contract.rs
• Priority: Medium
• Implementation & verification: Treat this as a protocol-safety change: check authorization, storage/ABI compatibility, ledger-time behavior, and emitted events before changing the implementation. Add a contract-level regression test for both the invalid and successful paths.
• **Required change set **: Change the relevant contract implementation together with its focused contract test, and include a type, error, or deployment-script adjustment only when required.

[hauwauyahass-byte]

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

I'd be glad to handle this issue. I'll keep the implementation concise, maintainable, and well-documented.

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

[Cedarich]

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

Hello maintainer can i take up this

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

[drips-wave]

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

🧑‍💻 @Cedarich: 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 @Cedarich as part of the Stellar Wave Program's 8th Wave 🥳

Moderator's reason: [Auto-assessed] The PR was accepted and merged by a maintainer (merged at 2026-08-26T12:57:51Z) and received an approving review from maintainer @Qoder-Voidd. The changes add end-to-end tests for the storage version migration system in test_contract.rs as requested by Issue #281.

😎 @Cedarich: 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.