No total banked credits aggregate in FarmingPool

[ritaifeoluwa]

Description

The FarmingPool contract does not have a way to query the total amount of credits banked across all users. While individual user credits are queryable, there is no aggregate.

Current behavior

No banked credits aggregate.

Expected behavior

Maintain a running total:

fn total_banked_credits(env: &Env) -> i128 {
    env.storage().instance().get(&DataKey::TotalBankedCredits).unwrap_or(0)
}

Update during checkpoints and withdrawals.

Why this matters

Protocol analytics need total banked credits for reward distribution calculations.

Labels

enhancement, farming-pool, help wanted

[dunnidev]

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

Hello maintainer, I can fix this issue

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[akinboyewaSamson]

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Hello maintainer, I would love to work on this issue

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[chainsmt]

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Hello, can I work on this issue?

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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

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[yaegerbomb42]

/attempt

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