I tried this, SQL Server isnt supported yet... its just not even in the dropdown options. However it is listed in the marketing and product overview text so it seems like it's coming.

EDIT: looks like it's there now. will try it out tonight then.

Great! Let me know how it goes. It will be a couple of days before I can try it. Hopefully I can migrate just the schema and cherry pick some relatively static tables. We'll see.

Postgres and SQL Server have different concurrency semantics, unlikely that you won't have subtle bugs unless your updates are very straightforward.