In January 2025, Miel Donkers enhanced data processing and reliability for ClickHouse by developing a new aggregate function, groupUniqArrayArrayMap, in the Altinity/ClickHouse repository, updating documentation and multilingual tests to support broader usage. Miel focused on backend development and performance optimization in Go, addressing three critical bugs in the ClickHouse/clickhouse-go client. This included refactoring Enum handling for correctness and speed, introducing stricter bounds checking, and rolling back recent Tuple2 interface and Go module changes to restore stability. The work demonstrated depth in database integration, error handling, and SQL, resulting in improved data integrity and more robust analytics capabilities.