wip: checkpoint multi-game core work

src/models/profile.rs

@@ -8,18 +8,22 @@ pub struct Profile {
     pub username: String,
     pub level: i64,
     pub xp: i64,
+    /// The game this profile belongs to (e.g. "fifa17", "fifa23"). Scopes all of
+    /// this profile's downstream state so multiple games share one core + DB.
+    pub game_id: String,
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
 }
 
 impl Profile {
-    pub fn new(username: impl Into<String>) -> Self {
+    pub fn new(username: impl Into<String>, game_id: impl Into<String>) -> Self {
         let now = Utc::now();
         Self {
             id: Uuid::new_v4().to_string(),
             username: username.into(),
             level: 1,
             xp: 0,
+            game_id: game_id.into(),
             created_at: now,
             updated_at: now,
         }