[Testing] Backend integration tests for market lifecycle

[GoSTEAN]

Description

End-to-end test for market lifecycle in backend.

Acceptance Criteria

• Test create → pool init → trade → close → resolve → settle
• Test with real database (Docker PostgreSQL)
• Verify balance changes at each step

Priority

🟠 P1 — High

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[AbuJulaybeeb]

@AbuJulaybeeb has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I would like to work on this because I constantly work with Docker postgrel and other related backend tools and packages

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[limitlxx]

@limitlxx has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

can you assign this issue to me

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[Ndifreke000]

@Ndifreke000 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

can i get this issue??

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Congratulations, @Ndifreke000! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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[drips-wave]

This issue has been completed by @Ndifreke000 as part of the Stellar Wave Program's 2nd Wave 🥳

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