Add Transaction Metadata Support

[llinsss]

Description:
Allow arbitrary metadata to be attached to transactions.

Tasks:

• Add metadata JSON field
• Validate metadata structure
• Add metadata search
• Limit metadata size

Files to modify:

• backend/models/Transaction.js
• backend/controllers/transactionController.js

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[codewithzubair07]

@codewithzubair07 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I’d like to take this issue.

I’m Zubair — a backend-focused developer experienced in schema design, validation logic, and API-layer enhancements.

GitHub: https://github.com/codwithzubair07

I’ll:

• Add a structured metadata JSON field to the Transaction model
• Implement validation for metadata structure and enforce size limits
• Add metadata-based search capability
• Update controller logic accordingly

I’ll ensure backward compatibility and proper validation handling.

ETA: 3–4 hours from assignment.

Happy to start immediately. 🚀

ℹ️ Repo Maintainers: To accept this application, review their application or assign @codewithzubair07 to this issue.

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Congratulations, @codewithzubair07! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @codewithzubair07: 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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This issue has been completed by @codewithzubair07 as part of the Stellar Wave Program's 2nd Wave 🥳

😎 @codewithzubair07: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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