The long story short is, I currently have a fairly standard full stack app running. It's a mailing list and the frontend shows some Posting info as well (https://apptrack.tech is the website for reference).
I'm trying to add a new application to accompany this. I really wanna use t3 stack for dev speed + nextauth is just super easy. My main issue is that my new app's data needs to have relations to the Postings in my original databse. I'm really lost on how to begin integrating these two and would love some help.