Worked on improving test reliability and resource management in the TonicAI/textual repository by addressing issues in redaction workflows. Focused on backend development and testing using Python, the developer implemented an automated cleanup process for redaction custom entities. This involved adding a delete_custom_entity function to redact_utils.py and integrating it into test_redact_file.py, ensuring that custom entities created during tests are properly deleted after use. The approach reduced resource leaks and minimized test flakiness, particularly in continuous integration environments. The work strengthened the safety and maintainability of the redaction test suite, reflecting a methodical approach to backend test hygiene.