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DEBUG_LOG.md

Step 1 — Understanding the Codebase

Prompt Used

This is a legacy Python script. Please provide a high-level summary of what it's supposed to do.

Findings

  • Script loads customer data.
  • Processes transactions.
  • Calculates analytics.
  • Exports reports.

Step 2 — Diagnosing the Bug

Error Log

ERROR - Error exporting data: 'dict' object has no attribute 'keys'

Root Cause

The export function assumed all customer records were valid dictionaries.

Malformed records caused export failure during CSV field extraction.

Step 3 — Writing Unit Tests

Prompt Used

Write a unittest test case that reproduces the export failure.

Outcome

Created failing test using malformed customer data.

Step 4 — Refactoring

Improvements Made

  • Added validation checks.
  • Added malformed record handling.
  • Improved export robustness.
  • Reduced repeated dictionary traversal.
  • Improved performance using optimized lookups.

Final Outcome

  • Bug fixed successfully.
  • Unit test passes.
  • Export functionality stabilized.
  • Performance improved.