/// <summary>
 /// Saves all models to persistent storage.
 /// </summary>
 public static void Save()
 {
     SaveModels?.Invoke();
 }
 /// <summary>
 /// Saves all catalogs to storage.
 /// </summary>
 public static void Save()
 {
     SaveCatalogs?.Invoke();
 }
 /// <summary>
 /// Loads all models from persistent storage.
 /// </summary>
 public static void Load()
 {
     LoadModels?.Invoke();
 }
 /// <summary>
 /// Loads all catalogs from storage.
 /// </summary>
 public static void Load()
 {
     LoadCatalogs?.Invoke();
 }