Worked on the RAG-Anything repository to enhance backend reliability by addressing resource cleanup during program shutdown. Focused on replacing the unreliable __del__ destructor with an atexit-based cleanup approach, ensuring deterministic release of resources when the application exits. This change resolved issues with flaky cleanup behavior, reducing the risk of resource leaks and improving overall deployment stability. The solution was implemented and validated using Python, with careful attention to lifecycle management and explicit exit handling. No new features were introduced during this period, but the targeted bug fix contributed to a more robust and maintainable backend codebase.