Worked on backend development for the infiniflow/ragflow repository, focusing on improving code quality and maintainability in Python. Addressed a targeted bug by removing duplicate .wav and .aac entries from the supported audio extensions list within the audio configuration module. This change, implemented in rag/app/audio.py, ensured more consistent configuration and reduced the risk of edge-case issues in audio handling. The fix was non-breaking and scoped to a single file, aligning with ongoing code cleanliness initiatives. By consolidating audio extension definitions, the work lowered the potential for misconfiguration, improved developer experience, and supported more predictable behavior for downstream users.