No lifetime credits earned getter in FarmingPool

[ritaifeoluwa]

Description

The FarmingPool contract does not have a way to query the total credits earned by a user across all time. While get_credits returns the current balance, there is no historical total.

Current behavior

get_credits returns banked credits plus accrued since last checkpoint.

Expected behavior

Add a total_credits_earned(user) -> i128 function that tracks cumulative credits earned (including withdrawn).

Why this matters

Users want to see their lifetime earnings, not just current balance.

Labels

enhancement, farming-pool, help wanted

[bubah911]

@bubah911 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I’d like to take this issue as an opportunity to contribute to the project and strengthen my open-source experience. I’ve carefully reviewed the requirements and believe I can complete the task responsibly. I’ll follow the project guidelines and submit a clean, tested PR.

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[Mutech939]

@Mutech939 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, I can work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Mutech939 to this issue.

[drips-wave]

Congratulations, @Mutech939! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Mutech939: 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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