Update model database schema

Elwig/Models/AreaComAttr.cs

@@ -0,0 +1,19 @@
+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models {
+    [Table("area_commitment_attribute"), PrimaryKey("VNr", "AttrId")]
+    public class AreaComAttr {
+        [Column("vnr")]
+        public int VNr { get; set; }
+
+        [Column("attrid")]
+        public string AttrId { get; set; }
+
+        [ForeignKey("VNr")]
+        public virtual AreaCom AreaCom { get; private set; }
+
+        [ForeignKey("AttrId")]
+        public virtual WineAttr WineAttr { get; private set; }
+    }
+}