Rename solution directory to Elwig

Elwig/Models/Contract.cs

@@ -0,0 +1,30 @@
+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+
+namespace Elwig.Models {
+    [Table("contract"), PrimaryKey("VNr")]
+    public class Contract {
+        [Column("vnr")]
+        public int VNr { get; set; }
+
+        [Column("mgnr")]
+        public int MgNr { get; set; }
+
+        [Column("year_from")]
+        public int YearFrom { get; set; }
+
+        [Column("year_to")]
+        public int? YearTo { get; set; }
+
+        [ForeignKey("MgNr")]
+        public virtual Member Member { get; private set; }
+
+        [InverseProperty("Contract")]
+        public virtual ISet<AreaCommitment> AreaCommitments { get; private set; }
+
+        [NotMapped]
+        public int Area => AreaCommitments.Select(a => a.Area).Sum();
+    }
+}