Worked on reliability hardening for the langgenius/dify repository, focusing on backend stability rather than feature development. Addressed a database connection leak in the embed_documents workflow by ensuring connections were properly released after embedding operations, which reduced the risk of resource exhaustion during long-running tasks. This technical debt reduction improved the stability and reliability of the system under high-load conditions. The work involved in-depth backend development and database management using Python, with careful attention to resource management and workflow robustness. No new features were introduced during this period, as efforts were concentrated on bug resolution and risk mitigation for ongoing operations.