Query Result Caching Layer

[DokaIzk]

Title: feat: implement caching for frequently accessed queries

Labels: performance api
Complexity: medium

Description:
Add caching layer for expensive queries using Redis:

• Cache GET /contracts endpoint (30s TTL)
• Cache GraphQL queries based on variables (60s TTL)
• Invalidate cache on mutations
• Support cache busting headers

Acceptance Criteria:

• Query results cached in Redis
• Cache keys include variables
• Cache invalidated on writes
• Cache stats endpoint
• Tests verify cache behavior

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[Andreas2410]

@Andreas2410 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would like to work on this issue. Please, assign me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Andreas2410 to this issue.

[Samuelaladesiun3334]

@Samuelaladesiun3334 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Please maintainer I would really love to work on this project

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Samuelaladesiun3334 to this issue.

[Dantama022]

@Dantama022 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

i would love to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Dantama022 to this issue.

[drips-wave]

Congratulations, @Dantama022! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Dantama022: 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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