Update model

Elwig/Models/AT_Gem.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations.Schema;
 
 namespace Elwig.Models {
@@ -9,5 +10,11 @@ namespace Elwig.Models {
 
         [Column("name")]
         public string Name { get; private set; }
+
+        [InverseProperty("Gem")]
+        public virtual ISet<AT_Kg> Kgs { get; private set; }
+
+        [InverseProperty("AtGem")]
+        public virtual WbGem? WbGem { get; private set; }
     }
 }