Do I duplicate user info in my own database, or just store everything in the auth0 database?

I’m making a basic CRUD app, so I have my own database. I don’t necessarily want to be using that database for the authentication (storing passwords) but I want to let users have profiles, with a bio and some other info. I also want to be able to tie users to posts, so do I just store basic info on auth0 and then everything else on my db, do I duplicate everything, do I just store everything on auth0? If I store everything on auth0, is there a way to do bulk retrieval or users? Can I query and select only certain user information?