Rework models

WGneu/Models/AT_Kg.cs

@@ -5,15 +5,15 @@ namespace WGneu.Models {
     [Table("AT_kg"), PrimaryKey("KgNr")]
     public class AT_Kg {
         [Column("kgnr")]
-        public int KgNr { get; set; }
+        public int KgNr { get; private set; }
 
         [Column("gkz")]
-        public int Gkz { get; set; }
+        public int Gkz { get; private set; }
 
         [Column("name")]
-        public string Name { get; set; }
+        public string Name { get; private set; }
 
         [ForeignKey("Gkz")]
-        public virtual AT_Gem Gem { get; set; }
+        public virtual AT_Gem Gem { get; private set; }
     }
 }