Models: Add Entities/ folder

Elwig/Models/Entities/AT_Kg.cs

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+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models.Entities {
+    [Table("AT_kg"), PrimaryKey("KgNr")]
+    public class AT_Kg {
+        [Column("kgnr")]
+        public int KgNr { get; private set; }
+
+        [Column("gkz")]
+        public int Gkz { get; private set; }
+
+        [Column("name")]
+        public string Name { get; private set; }
+
+        [ForeignKey("Gkz")]
+        public virtual AT_Gem Gem { get; private set; }
+
+        [InverseProperty("AtKg")]
+        public virtual WbKg WbKg { get; private set; }
+    }
+}