Add to Favourites using room database

i have done implementing the add to favourites using room db successfully.but it is only specific to single can i handle multiuser?

scenerio is-->when user install the app for the first time -->user can able to set favourites successfully.but when log out and another user log in he could able to see previous persons favourites which is wrong.

which is wrong -->i got where im going wrong because it is only having one db (specific to one single user)

i refered this answer ==>

i really need to know how to use it...i can provide all the codes if you need

really need help thanks....please dont downvote