[CT-21] Optimize batch operations to reduce ledger storage reads in assetsup in opsce crate

[yusuftomilola]

Problem

Several assetsup functions iterate over collections by calling individual env.storage().get() inside loops. Each storage read is a separate ledger entry access. For large datasets this pattern is inefficient and increases transaction fees.

Proposed Solution

Create contracts/opsce/src/storage_optimization.rs. Refactor identified hot-path functions to batch reads using a single Vec-backed storage key where possible.

Acceptance Criteria

• Identify at least 3 functions in assetsup/src/ that iterate with per-item storage reads
• Propose and implement a batch_get storage pattern using a single Vec storage entry for collections of up to 50 items
• The refactored implementation produces identical outputs as the original for all inputs
• Unit tests confirm behavioral equivalence before and after optimization
• A code comment documents the trade-off: single-entry reads are faster for lookup; Vec-backed reads are faster for iteration
• cargo test passes after the change

[paulpeter32-coder]

@paulpeter32-coder has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I’ve reviewed the issue and the related relevant files. I’d like to work on this and can deliver a clean, well-tested implementation. Please assign it to me. Thanks!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @paulpeter32-coder to this issue.

[nafsonig]

@nafsonig has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Let me implement this task as soon as possible

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

[drips-wave]

Congratulations, @nafsonig! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @nafsonig: 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 🌊