Implement database sharding strategy

[RUKAYAT-CODER]

Sharding enables horizontal scaling.

Acceptance Criteria:

• Sharding strategy documented
• Router implementation
• Migration strategy
• Rebalancing procedure

[amankoli09]

@amankoli09 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Can I work on this? PR merge within 1 hr

ℹ️ Repo Maintainers: To accept this application, review their application or assign @amankoli09 to this issue.

[drips-wave]

Congratulations, @amankoli09! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @amankoli09: 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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