Ensure ColorFormatter restores original levelname for sibling handlers

[KristopherKubicki]

Summary

• update ColorFormatter to temporarily colorize the level name and restore the original value after formatting
• add a regression test that ensures a plain handler stays uncolored when paired with a colored handler on the same logger

Testing

• pytest tests/test_color_formatter.py

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Codex Task

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Read StringIO after closing underlying stream

The regression test closes both handlers, but StreamHandler.close() also closes the attached StringIO. When execution reaches colored_stream.getvalue().strip() the stream is already closed and Python raises ValueError: I/O operation on closed file, so the test never reaches its assertions. Fetch the buffered contents before calling close() (or avoid closing the handlers) so the test exercises the behavior it is meant to verify.

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[Copilot]

Pull Request Overview

This PR fixes a bug where ColorFormatter would permanently modify the levelname attribute of LogRecord objects, causing sibling handlers (that share the same LogRecord instance) to incorrectly receive colorized level names even when using plain formatters.

Key Changes:

• Modified ColorFormatter.format() to save, modify, and restore the original levelname using a try/finally block
• Added a regression test verifying that plain handlers remain unaffected when paired with colored handlers on the same logger
• Added a conditional check to only modify levelname when a color mapping exists

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/utils/logging_utils.py	Implements levelname preservation in ColorFormatter using try/finally to restore the original value after formatting
tests/test_color_formatter.py	Adds regression test verifying plain handlers stay uncolored when used alongside colored handlers

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

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