GSettings provides an api to create relocatable schemas. Such schema is useful if you have a set of keys that you want to use repeatedly. For example an application can define user accounts. Each user account needs the same set of keys, but with different values each time.

GSettings however does not seem to provide an api to delete the keys from the database again though. So if the application goes through some iterations of creating and deleting accounts, some cruft starts to build up in the database.