Add integration test for sell event indexer correctly persisting sell events from Soroban stream

[Chucks1093]

Summary

The indexer processes sell events from the Soroban transaction stream but there is no integration test confirming sell events are persisted correctly. A test should feed a mock sell event into the pipeline and assert the database record matches the event fields.

Scope

• Feed a mock Soroban sell event into the indexer pipeline
• Assert a trade record is created with type sell and correct fields: seller, creator_id, quantity, proceeds, ledger, timestamp
• Assert duplicate sell events are deduplicated using the same hash+index logic as buy events
• Assert a sell event with a missing required field is skipped with a warn-level log

Acceptance Criteria

• Sell trade record created with all six fields correct and type: sell
• Duplicate sell event does not create a second record
• Malformed sell event skipped without crashing the indexer
• Skipped event produces a warn-level log

ETA: 12 hours

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Coordinate on Telegram

[omoh5]

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Please can you assign this to me
Thank you

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[Timrossid]

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Hi maintainer, I’ve reviewed this issue and I would love to work on this. I am confident that I will be able to resolve it neatly.

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[ONEONUORA]

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Hi
I am a backend developer with 5 years of experience designing arch and endpoints

I believe i can handle this issue

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[grantfox-oss]

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@ONEONUORA's PR #633 was approved and merged by @Chucks1093.

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