[Backend] claimable.service.ts cache key does not include token address, so streams with the same id across tokens could collide

[grantfox-oss]

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Why this matters

claimable.service.ts derives its cache key primarily from streamId; if two streams ever share the same numeric id across different token deployments the cache could serve a stale claimable amount for the wrong token, silently corrupting displayed balances.

Acceptance criteria

• Audit the cache key construction in claimable.service.ts
• Include tokenAddress in the cache key if it is not already uniquely scoped
• Add a unit test with two same-id streams on different tokens asserting independent cache entries

Files to touch

• backend/src/services/claimable.service.ts

Out of scope

Does not change the underlying claimable calculation formula.

[BigMick03]

@BigMick03 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi there boss. Can I work on this?

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[Smartdevs17]

@Smartdevs17 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

can I work on this

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[drips-wave]

Congratulations, @BigMick03! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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