During July 2025, Haehae focused on repository hygiene for se-sac/sesac-01 by removing the outdated chest-xray-pneumonia homework directory and its nested files.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 streamlined the codebase, reducing clutter and minimizing confusion for current and future contributors. Haehae used disciplined git practices, including a clear, traceable commit message and precise scope, to ensure the change was easy to audit and low risk. The update, implemented with shell scripting and git, improved onboarding and long-term maintainability. While no bugs were fixed during this period, the maintenance work demonstrated attention to codebase quality and effective use of version control workflows.