Vendor databases and linking to source control

We have several databases for applications by vendors. The vendors do all their own development and updates to the databases so we don't feel the need to store these databases in source control since we don't maintain the development so to speak. BUT, we do create objects from time to time such as stored procedures for reports. We store these objects created and maintained by us in a separate schema for easier differentiating and for security purposes. We would like to be able to store these objects in source control using your tool easily.

TL;DR, it would be nice if we can link a database to source control with some filters on objects such as schema when we don't need an entire database's objects under source control.