During September 2025, Bing Chen focused on reliability hardening for the langgenius/dify repository, addressing technical debt rather than delivering new features. He concentrated on backend development using Python, specifically targeting a persistent database connection leak in the embed_documents workflow. By ensuring that database connections were properly released after embedding operations, Bing mitigated the risk of connection exhaustion during long-running tasks. His work improved resource management and stabilized the workflow under high-load conditions. This effort required a deep understanding of database management and backend systems, resulting in a more robust and maintainable codebase for future development and operational stability.