Reduce event data size

[Samuel1-ona]

Minimize event payload sizes to reduce transaction costs.

Acceptance Criteria:

• Remove redundant fields from events
• Use IDs instead of full objects in events
• Measure gas savings per event type
• Maintain backward compatibility for indexers

[theFirstCodeManiac]

@theFirstCodeManiac has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please can this be assigned to me so I can work on it immediately.

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

[drips-wave]

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

🧑‍💻 @theFirstCodeManiac: 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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🌊 Happy Wave 🌊