I just learned that Session.Save() can do nearly all the same things as Collection.Insert(), but this did help me learn that Collection.Insert() does not use the following validation hooks:

BeforeCreate(db.Session) error
AfterCreate(db.Session) error
BeforeUpdate(db.Session) error
AfterUpdate(db.Session) error
BeforeDelete(db.Session) error
AfterDelete(db.Session) error
Validate() error

Uncertain if this were intentional, but I wanted to point it out nonetheless!

Thanks in advance for reading my issue.