Billing: fix calculation

Elwig/Models/PaymentDeliveryPartBucket.cs

@@ -0,0 +1,44 @@
+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models {
+    [Table("payment_delivery_part_bucket"), PrimaryKey("Year", "DId", "DPNr", "BktNr", "AvNr")]
+    public class PaymentDeliveryPartBucket {
+        [Column("year")]
+        public int Year { get; set; }
+
+        [Column("did")]
+        public int DId { get; set; }
+
+        [Column("dpnr")]
+        public int DPNr { get; set; }
+
+        [Column("bktnr")]
+        public int BktNr { get; set; }
+
+        [Column("avnr")]
+        public int AvNr { get; set; }
+
+        [Column("price")]
+        public long PriceValue { get; set; }
+        [NotMapped]
+        public decimal Price {
+            get => Variant.Season.DecFromDb(PriceValue);
+            set => PriceValue = Variant.Season.DecToDb(value);
+        }
+
+        [Column("amount")]
+        public long AmountValue { get; set; }
+        [NotMapped]
+        public decimal Amount {
+            get => Variant.Season.DecFromDb(AmountValue);
+            set => AmountValue = Variant.Season.DecToDb(value);
+        }
+
+        [ForeignKey("Year, AvNr")]
+        public virtual PaymentVar Variant { get; private set; }
+
+        [ForeignKey("Year, DId, DPNr")]
+        public virtual DeliveryPart DeliveryPart { get; private set; }
+    }
+}