Lists every schema of a data warehouse source (Snowflake, BigQuery or Databricks) with the database it belongs to and how many tables and views it holds. For BigQuery the database is a project and the schema a dataset; for Databricks the database is the source's share. The list comes from Bobsled's catalog of the source, refreshed when the source connection is set up or tested and periodically after that, so a recently created schema can be missing.