Ability to mark image as a favorite or remove it

I would do the favorites routes differently than he proposed. He had only a Put Route, so only updating and no create or delete routes: PUT /image/<image-id>/favorite that would make sense if it were only a flag or boolean on the image object:

image
is-favorit-bool

But we have more than one user: 10 users could have that one image as their fav and one user could have 30 favorites So instead I would create a favorites table with the foreign keys:

db table favorites
user_id | image_id

and as new routes:

Post /image/<image-id>/favorit
Delete /image/<image-id>/favorit

and keep

GET /me/favorites
GET /me/favorites/export