> I also need the metadata for the rows to be in something more robust like Postgres or Mongo. How big is that metadata? If it's less than tens of millions ro

> I also need the metadata for the rows to be in something more robust like Postgres or Mongo. How big is that metadata? If it's less than tens of millions rows, you can look at External Dictionaries support in clickhouse. https://clickhouse.tech/docs/en/sql-reference/dictionaries/external-dictionaries/external-dicts/#dicts-external-dicts https://clickhouse.tech/docs/en/sql-reference/dictionaries/e... https://altinity.com/blog/2020/5/19/clickhouse-dictionaries-reloaded https://altinity.com/blog/2020/5/19/clickhouse-dictionaries-...