Currently I am using custom authentication, and the endpoint I'm using is from supabases self hosted auth. I have sign up working with anonymous users and using email and password. What I'd like to do is be able to upgrade an anonymous user using email and password. So an anonymous user goes to a sign up form, enters an email and password (which hits supabase's /signup endpoint), and I'd like to upgrade the current user so that it has the same ID it had as an anonymous user, rather than just continuing with the newly created one and it's ID.
I want the userID to remain the same for the purpose of backend analytics.
Also, I know you could use supabase directly as authentication in Flutterflow but I didn't make the decision/cant change it and I'm not sure it would help anyway.