Verify overflow validation limits inside financial_report_exporter

[godamongstmen897]

Problem & Goal

Add numeric limits checks on input variables in the financial_report_exporter module to block math overflow exceptions.

Context & Components

• Target Repository: escrow-backend
• Module/Component: financial_report_exporter (Transaction logs spreadsheet writer)

Implementation Details

1. Review the existing codebase inside the escrow-backend directory.
2. Locate the source files relating to financial_report_exporter.
3. Implement the feature logic/validation rules step-by-step.
4. Ensure code conforms to codebase patterns (lints, formats, types).

Verification & Testing Requirements

• Validation check: Assert that excessive digits are caught and blocked with error codes.
• Add comprehensive test cases matching these validation requirements.
• Ensure all other existing project tests continue to compile and pass.

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Note: This issue is completely self-contained and does not block or require any other issues to be resolved.

[OMGO-Code]

@OMGO-Code has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer, I would like to work on this issue.

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[ekelemepraise-code]

@ekelemepraise-code has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

GM GM Maintainer, pls can I work on this issue ? ETA - 12hrs

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ekelemepraise-code to this issue.

[drips-wave]

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

🧑‍💻 @ekelemepraise-code: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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