Worked on enhancing username validation in the milvus-io/milvus repository by updating the ValidateUsername logic to support '.' and '-' characters in usernames. This change addressed user feedback from issue #42417 and aligned the validation process with evolving product requirements, reducing friction during sign-up and improving user identity management. The implementation involved modifying Go code in internal/proxy/util.go and expanding unit tests to ensure comprehensive coverage of new username formats. Emphasized test-driven development and continuous integration to maintain regression safety. Focused on backend development, code validation logic, and collaborative issue tracking, delivering a targeted feature with minimal risk to existing workflows.