Scriptable Object not saving changes to a list.

Hey. So im very new to using scriptable objects but am working on an item database.

I have scriptable objects for each of my items and a scriptable object for my database(this just contains a list of Items)

I have a function that i call in the editor called ValidateDataBase, which gets all the items and adds them to the list.

Here is my code:

 public static void ValidateDataBase (){
         ItemDataBaseManager _myDataBase = (ItemDataBaseManager)AssetDatabase.LoadAssetAtPath ("Assets/Resources/ItemDataBase/ItemDataBase.asset", typeof(ItemDataBaseManager));
         if (_myDataBase != null) {
             _myDataBase.ClearDataBase ();
             BaseItem[] items = Resources.LoadAll<BaseItem> (@"ItemDataBase");
             foreach (BaseItem item in items) {
                 _myDataBase.AddItemToDataBase (item);
             }
             Debug.Log("Validated Item DataBase.");
         } else {
             Debug.LogWarning("Failed Validated Item DataBase. DataBase Doesnt Exist.");
         }
             
         AssetDatabase.SaveAssets ();
         AssetDatabase.Refresh();
     }

So this works and it adds my items to the database list(a scriptable object) BUT after i close unity and open it again my list is empty. Its likely i just dont fully understand how saving assets work.

Any help would be great. Thanks ~Scott