Worked on upgrading the API schema in the Difegue/LANraragi repository to OpenAPI 3.1, focusing on enabling null as a valid parameter type to improve schema flexibility and client interoperability. Addressed migration challenges from OpenAPI 3.0 by implementing fixes that preserved backward compatibility and reduced integration risks. Adjusted field typings in YAML to align with the updated specification, ensuring smoother future enhancements. The work was delivered as a single, well-documented commit, supporting traceability and collaborative development. Demonstrated skills in API development and OpenAPI Specification, with a technical approach centered on maintainability and forward compatibility for evolving API requirements.