Add integration test for the sell endpoint updating the seller's key balance in the database after a confirmed sell

[Chucks1093]

Summary

After a confirmed sell the seller's key balance in the database should reflect the reduced amount. An integration test should execute a sell and confirm both the database record and the balance endpoint return the updated value.

Scope

• Seed a wallet with a balance of 10 keys for a creator
• Call the sell endpoint to sell 4 keys and await confirmation
• Query the balance endpoint for that wallet and creator, assert balance is 6
• Sell the remaining 6 keys and assert balance is 0
• Assert the wallet is no longer returned in the key holder list after selling all keys

Acceptance Criteria

• Balance 6 after selling 4 from 10
• Balance 0 after selling the remaining 6
• Wallet absent from holder list after selling all keys
• Balance endpoint and database record are consistent after each sell

ETA: 12 hours

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Coordinate on Telegram

[Lspnjr1]

Hello maintainers,
I’m Lspnjr1
I would like to be assigned to this issue. After reviewing the requirements, I’m confident that I understand the scope of the task and the project’s contribution criteria. I believe I can deliver a clean, maintainable implementation that aligns with the project’s standards.

[RedheadedProgrammer]

I would like to work on this issue