Hello! I'm Robert and this is my first post here! I'm soon starting a big application of mine that I hope will have use in the real world. The problem is, I know I have to make everything clean and fast, so how should I design it so it stays scalable, efficient and powerful? It's about a web app made with React on front-end, Node.js with Express and PostgreSQL on the back-end. My main concern is designing the database and relationships. I'm still new with this kind of stuff. Thank you for your attention!