适用于iOS应用的Firebase数据结构，包含配置文件和基本游戏化

I am currently building out my iOS 10 app with user profiles, which should hold certain achievements and experience points (similar system to StackOverflow). I have already built my Facebook Login, FIRAuth etc. At the moment I am thinking about the data structure of Firebase's DB. I have read through the I am currently building out my iOS 10 app with