[DOCS] Document smart contract storage schema

[dev-fatima-24]

Priority: medium

Description

The contract storage schema (patient → token IDs, token ID → record, issuer → bool) is only described briefly in the README. A detailed schema document helps developers understand data layout and query patterns.

Acceptance Criteria

• All storage keys and their value types are documented
• Key derivation logic is explained
• Maximum storage sizes and cost implications are noted
• Schema document is stored in docs/contract-storage.md
• Document is updated when the schema changes

[drips-wave]

Congratulations, @rainwaters11! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @rainwaters11: 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

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[newmattock]

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

I would love to work on this issue.

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[adelekevictor12]

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I will like to handle this task

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[Chigybillionz]

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hey let me resolve this immediately

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[theFirstCodeManiac]

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

Boss lady let me work on this for you please

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[MerlinTheWhiz]

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

Give me a very concised pr of changes made with files affected. I mean a very very very concised one in list format

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[AlphaTechini]

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I would love to work on this issue and resolve it before the wave ends.

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[habnark]

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

I am very interested in taking on this issue. I have extensive experience with technical documentation and smart contract architecture, and I am confident that I can clearly and accurately document the storage schema for the VacciChain project. Please let me know if you need any additional information from my side

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[RaymondAbiola]

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

Hi, I’d like to work on this issue. I have experience with rust, Solidity, frontend, and backend development, and I’m confident I can deliver a clean solution.

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