User object structure

This document aims at figuring out how we want to structure our user object in order to limit the amount of changes required later.

let user =
    {
        id: Number,
        email: String,
        profilePicture: String,
        name: String,
        createdOn: Date,
        lastLoginDate: Date,
        preferences: {
            darkTheme: Boolean,
            language: String,
            tracking: Boolean,
            moveEpicsToBacklogAfter: Number
        }
    }