[Bug] Large batch operations exceed Stellar event size limits

[Dev-AdeTutu]

Describe the Bug

Batch operations with 100+ meters fail because emitted events exceed Stellar's maximum event data size (256 bytes per event).

Steps to Reproduce

1. Call batch_update_usage with 150 meters
2. Contract attempts to emit event with all 150 meter IDs
3. Transaction fails: event data exceeds limit
4. Entire batch operation fails

Expected Behavior

Emit multiple smaller events or don't include full meter list in event payload.

Actual Behavior

Single large event causes transaction failure.

Environment

Field	Value
Component	contracts
Rust version	rustc 1.77.0
Network	testnet

[16navigabraham]

@16navigabraham has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello, please can i have this ?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @16navigabraham to this issue.

[DrSa7ag3]

@DrSa7ag3 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello, I’ve read through the issue description and understand the expected outcome. I’d be glad to work on it.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @DrSa7ag3 to this issue.

[wheval]

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

Hello i would love to work on this.

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

[drips-wave]

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

🧑‍💻 @wheval: 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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