- User[] : id, username
- User
3 users User - id - username
- List[]: id, title
User 1 has 2 lists User 2 has 1 list User 3 has no list
/users will show the lists belonging to the users too
- Todo[]: id, label, completed
User 1's lists 1 - has no items 2 - has 1 item
User 2's list has 3 items