Worked on the jd-opensource/OxyGent repository with a focus on backend stability and maintainability. Addressed a critical bug by removing a duplicate is_entrance field from the Oxy class, which helped prevent potential runtime issues and reduced technical debt. The solution involved targeted Python code cleanup and careful refactoring in base_oxy.py, consolidating changes into a single, well-documented commit. Emphasized data model consistency and commit hygiene throughout the process. Demonstrated backend development skills by improving code quality and laying a cleaner foundation for future features, ensuring the codebase remains robust and easier to maintain as it evolves.