Billing: Add feature to calculate member/delivery bins

Elwig/Models/DeliveryPartBin.cs

@@ -0,0 +1,46 @@
+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models {
+    [Table("delivery_part_bin"), PrimaryKey("Year", "DId", "DPNr")]
+    public class DeliveryPartBin {
+        [Column("year")]
+        public int Year { get; set; }
+
+        [Column("did")]
+        public int DId { get; set; }
+
+        [Column("dpnr")]
+        public int DPNr { get; set; }
+
+        [ForeignKey("Year, DId, DPNr")]
+        public virtual DeliveryPart Part { get; private set; }
+
+        [Column("bin_1")]
+        public int? Bin1 { get; set; }
+
+        [Column("bin_2")]
+        public int? Bin2 { get; set; }
+
+        [Column("bin_3")]
+        public int? Bin3 { get; set; }
+
+        [Column("bin_4")]
+        public int? Bin4 { get; set; }
+
+        [Column("bin_5")]
+        public int? Bin5 { get; set; }
+
+        [Column("bin_6")]
+        public int? Bin6 { get; set; }
+
+        [Column("bin_7")]
+        public int? Bin7 { get; set; }
+
+        [Column("bin_8")]
+        public int? Bin8 { get; set; }
+
+        [Column("bin_9")]
+        public int? Bin9 { get; set; }
+    }
+}