Optimize status query path to avoid full reverse scan

[hman38705]

Issue 036: Optimize status query path to avoid full reverse scan

Area: Contracts
Priority: Medium
Files: contracts/predict-iq/src/modules/queries.rs, contracts/predict-iq/src/modules/markets.rs

Problem

get_markets_by_status reverse-scans all markets and becomes expensive at scale. Gas costs grow linearly with market count.

Acceptance Criteria

• Add status index keys or equivalent strategy\n- Query complexity is reduced\n- Gas benchmark demonstrates improvement\n- Index maintenance cost is documented

[richardiyamura]

@richardiyamura has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi. Can I get assigned to this, please?

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[drips-wave]

Congratulations, @richardiyamura! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @richardiyamura: 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.

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[drips-wave]

This issue has been completed by @richardiyamura as part of the Stellar Wave Program's 4th Wave 🥳

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