In December 2024, Mihir Shah enhanced the microbiomedata/nmdc-runtime repository by developing a feature that incorporated class ancestry into the _type_and_ancestors field for the alldocs collection. He refactored the materialize_alldocs Dagster operation, improving the indexing strategy to support more accurate data lineage and faster downstream analytics. Using Python and MongoDB, Mihir updated the data model and refreshed documentation to reflect these changes, which streamline data discovery and reduce onboarding time for new contributors. The work demonstrated a strong grasp of data engineering principles and database management, delivering a focused, well-documented improvement to the project’s data representation capabilities.