[Frontend] Pool deposit/withdraw optimistic update fires on build-tx success, not on signed-submit, so balances bump then revert before the transaction is signed

[grantfox-oss]

Telegram (ask questions / claim the issue here first): https://t.me/+DOylgFv1jyJlNzM0

Why this matters

useDepositToPool (useApi.ts:1569) and useWithdrawFromPool (useApi.ts:1639) carry full optimistic-update/rollback logic, but their mutationFn only calls /pool/build-deposit / /pool/build-withdraw which return an UNSIGNED xdr (lines 1581,1651) - no signing or submission happens in the mutation. onMutate optimistically increments pool.stats.totalDeposits and depositor.depositAmount (lines 1598-1610), then onSettled immediately invalidates pool.stats and pool.depositor (lines 1627-1630), refetching the pre-deposit server values and wiping the optimistic bump within ~one round-trip - all before useDepositOperation even calls signTransaction/submitPoolTransaction (useRepaymentOperation.ts:160-163). Net effect: the user briefly sees an inflated pool/portfolio balance that does not correspond to any settled (or even signed) deposit, and if they then reject the wallet signature the number still flickered up with no deposit; onError rollback (lines 1615-1625) only covers a failed build, never a failed sign/submit.

Acceptance criteria

• Move the optimistic increment so it reflects an actually submitted transaction (e.g., after submitPoolTransaction succeeds) rather than after the build step
• Do not invalidate pool.stats/pool.depositor in the build mutation's onSettled, or defer invalidation until the deposit/withdraw is submitted
• Ensure rollback covers signing/submission failures, not only build failures

Files to touch

• frontend/src/app/hooks/useApi.ts
• frontend/src/app/hooks/useRepaymentOperation.ts

Out of scope

• The unused useRepayLoan optimistic hook (defined but never imported)

[akinboyewaSamson]

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

[akinboyewaSamson]

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

[Levi-Ojukwu]

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

Hello maintainer, I can handle this issue.

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[grantfox-oss]

🦊 GrantFox — @Levi-Ojukwu has been assigned to this issue!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #1107)
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Good luck! Track your progress on GrantFox.

[drips-wave]

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

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@Levi-Ojukwu's PR #1123 was approved and merged by @ogazboiz.

🏆 @Levi-Ojukwu: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (191 total points). Track your full progress on GrantFox.

👏 Great work, @Levi-Ojukwu! Keep contributing to LabsCrypt.

[drips-wave]

This issue has been completed by @Levi-Ojukwu as part of the Stellar Wave Program's 6th Wave 🥳

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