Was initially thinking of just storing a DictProperty of `entity_type` to list of entities. This would allow us to make generic toggles for various entity types (like domains and users and whatever else we feel like). I didn't go down that route simply because I wanted to avoid a migration and because I figured we wouldn't really want toggles for more than domains and users. But if it's a goal to make this tool generic and not coupled with HQ, it seems like that's the route to take. @czue