Worked on the HKUDS/LightRAG repository to deliver targeted code quality improvements and maintainability refactorings using Python for backend development. Focused on reducing technical debt by removing redundant code paths, such as eliminating unnecessary file_path_placeholder lookups in the _merge_edges_then_upsert function and cleaning up dead configuration handling involving config.ini and configparser. Also dropped unused assignments like Ollama_NUM_CTX to clarify configuration logic. These changes streamlined the codebase, minimized the risk of regressions, and improved onboarding for future contributors. The work was executed through a series of focused commits, enhancing efficiency, readability, and maintainability across the backend Python codebase.