Databricks support landed in #239 with wiremock replays of the protocol, but it has never run against a Databricks workspace with a running SQL warehouse. If you have one, please register it under System settings > Data sources as

databricks://:TOKEN@host/sql/1.0/warehouses/ID?catalog=main

then Test, mount it on a base, refresh the schema, and ask Chat a question that needs a query. What we need back: whether Test and the schema sync succeed, what the schema document looks like (table count, comments present or not), and one query_data round trip — the SQL the model wrote and what came back. Anything that fails, paste the error text; the engine surfaces the service's own message.

See docs/decisions/0017 for what is deliberately not supported yet (key-pair JWT for Snowflake, Kerberos / OAuth2 for Trino).