While reading this thread, I investigated if "cleanup databases" will trigger serialization process. I checked log files and nothing related to serialization is logged?
@Dmytro suggested that Sitecore never triggers serialization process.
Does that mean someone who is using Unicorn will get those orphan trees and items back in the next sync? Is it better to reserialize in unicorn.aspx every time we did a database cleanup?
Or does Unicorn pick up the database cleanup task and reserialize automatically?