Materials were refactored

StructureHelperCommon/Infrastructures/Interfaces/ISaveable.cs

@@ -1,8 +1,13 @@
-namespace StructureHelperCommon.Infrastructures.Interfaces
+using System;
+
+namespace StructureHelperCommon.Infrastructures.Interfaces
 {
     public interface ISaveable
     {
-        int Id { get; set; }
+        /// <summary>
+        /// Unique identifier
+        /// </summary>
+        Guid Id { get;}
         void Save();
     }
 }