prs/prs.media/purge.txt

Guid Entity.Deleted;
Guid EntityLink.Deleted;

class Deletion : IPersistent { // !! Not IRemotable
	Guid ID;
	DateTime Date;
	UserLink User;
	string HeadTable;
	string Entity;
}

Provider.Query/Provider.List {
	Add (Deleted is NULL) for every query where condition
}
Provider.Delete {
	Add to Deletions and get Deletion.ID
	Find all deleted entities (head entity and all cascades) and set Deletion.ID for each
}
Provider.Save {
	// Do nothing
}

TO BE RESOLVED:
Multi-Delete creates one deletion or many

Purge Delete {
	Delete Entity;
	for relationship in children {
		if relationship == Cascade {
			Purge relationship.Child;
		} else if relationship == SetNull {
			relationship.Child.ID = NULL;
		}
	}
	
	Purge Deletion;
}