feat: fix and improve model list ui and features

backend/src/app.py

@@ -318,12 +318,12 @@ class App(ChatMixin):
                 print(f"Deleted model: {model_id}")
                 return None
             else:
-                model = await db.Model.update_or_create(
-                    id=model_id,
+                await db.Model.filter(id=model_id).update(
                     name=name,
                     kind=kind,
                     value=value,
                 )
+                model = await db.Model.get(id=model_id)
         print(f"Saved model: {model.id} - {name}")
         return model