I was able to prototype this myself in the Databricks free edition. I successfully synced data from Lakebase to Delta Lake and vice versa with zero ETL code, including reverse ETL. In other words, Delta Lake can use a Lakebase summary table as a lookup to avoid expensive OLTP joins โ which is a big win.
One important thing I learned: Lakebase databases live in Databricksโmanaged storage, not in your own S3 bucket or AWS account the way classic Delta tables in the lakehouse do.
I'm sure some mission critical application that customer manage data they may not be comfortable with this approach.