I forgot to mention. If you have access to /admin center for your instance, then you can do a database export.
Choose you environment > Database > Create Database Export.

It comes through as .bacprac file that you can restore to a local SQL instance. I've found it pretty invaluable for exploring the schema. But you are limited to 10 a month.
You also have to export the file into azure storage - but you can download it from there.