Remove the predefined 'id' property.

This property is not necessary and gives less flexibility.

src/Libs/Model.php

@@ -23,8 +23,6 @@ use AllowDynamicProperties;
 
 #[AllowDynamicProperties]
 class Model {
-
-    public           ?int    $id          = null;
     protected        array   $toNull      = [];
     static protected string  $primaryKey  = 'id';
     static protected array   $ignoreSave  = ['id'];