📝 🚀 "Refactor backend structure

backend/models.py

@@ -400,6 +400,26 @@ class User(UserMixin, Base):
             
             return user
     
+    @classmethod
+    def get_by_id_cached(cls, user_id: int) -> Optional['User']:
+        """
+        Holt einen Benutzer anhand der ID mit Caching.
+        """
+        cache_key = get_cache_key("User", user_id, "id")
+        cached_user = get_cache(cache_key)
+        
+        if cached_user is not None:
+            return cached_user
+        
+        with get_cached_session() as session:
+            user = session.query(cls).filter(cls.id == user_id).first()
+            
+            if user:
+                # User für 10 Minuten cachen
+                set_cache(cache_key, user, 600)
+            
+            return user
+    
     def update_last_login(self):
         """
         Aktualisiert den letzten Login-Zeitstempel.