In March 2025, Chunha Han focused on backend development and caching within the NationalSecurityAgency/datawave repository, addressing a critical bug in the query caching mechanism. By refining the Query Model cache key to incorporate evaluationOnlyFields, Chunha ensured that cache entries accurately reflected different sets of evaluation-only fields, preventing incorrect model retrieval and improving the reliability of query results. This Java-based solution enhanced the correctness of the Metadatahelper.getQueryModel() method, aligning with issue #2794 to reduce cache-related bugs in production. Chunha’s work demonstrated a deep understanding of backend systems and effective use of Java to resolve complex caching challenges.