During July 2025, Haehae focused on repository hygiene for se-sac/sesac-01 by removing the outdated chest-xray-pneumonia homework directory and its nested files. This work targeted the elimination of legacy artifacts to streamline the codebase and reduce confusion for new contributors. Haehae used disciplined git practices, including a single, well-documented commit to ensure traceability and minimal impact on unrelated code. The cleanup, performed using shell scripting and git, improved onboarding and long-term maintainability by aligning the repository with current project needs. While no bugs were fixed, the work demonstrated careful attention to codebase quality and effective use of version control.