optimized schema

backend/README.md

@@ -3,7 +3,8 @@
 ```mermaid
 erDiagram
     user {
-        string name PK
+        serial id PK
+        string name
     }
 
     game {
@@ -11,17 +12,33 @@ erDiagram
         int score
         time playtime
         date date
-        string username FK
+        int user_id FK
     }
 
-    user ||--O{ game : "played"
-
-    user_data {
-        string username PK
+    user_scores {
+        int user_id PK
         int highscore
         int total_score
         int total_playtime
         int average_score
         int games_played
     }
-```
+    
+    lb_highscore {
+        int rank
+        int user_id
+        int highscore
+    }
+    
+    lb_total_playtime {
+        int rank
+        int user_id
+        time total_playtime
+    }
+    
+    user ||--O{ game : "played"
+    user ||--|| user_scores : ""
+```
+`lb_highscore` and `lb_total_playtime` are views querying the `user_scores` table.
+
+A trigger function on insert to the `user` table creates a new row in `user_scores`. Everytime a new `game` is inserted, the row is updated.