It would be metadata like name of list, date created, last updated, source of list, and that sort of thing that doesn't change based on snapshot (basically, everything I need to show on the dashboard). The list of snapshots could be as simple as the snapshot ids to start out with, but will need more data later depending on what we want to show in charts like subscribers over time or bad emails over time or whatever. For now just the snapshot ids would be a good start.