Shopping list again. We've been through this a few times so we should all know the words by now.

Lists are our aggregation roots. Lists have a name, a unique id, a list of users with access, and a list of items. Items have a name and a status. Items are distinguished by name (ignoring case).

Commands are CreateList, RenameList, DeleteList, AddItem, RenameItem, SetItemStatus, DeleteItem, ShareList, AcceptList.

Clients handle commands from the ui locally and pass events to the backend to be fanned out to other clients. The backend stores all events and sends new events to a client when it connects.

Backend stores events and a projection of the current state of lists that's built at app start time and updated as events arrive. Database is a single table of list id, timestamp, event blob.