[#48] Billing: Add custom modifiers for members

Elwig/Models/Entities/PaymentCustom.cs

@@ -0,0 +1,31 @@
+using Elwig.Helpers;
+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models.Entities {
+    [Table("payment_custom"), PrimaryKey("Year", "MgNr")]
+    public class PaymentCustom {
+        [Column("year")]
+        public int Year { get; set; }
+
+        [Column("mgnr")]
+        public int MgNr { get; set; }
+
+        [Column("amount")]
+        public long AmountValue { get; set; }
+        [NotMapped]
+        public decimal Amount {
+            get => Utils.DecFromDb(AmountValue, 2);
+            set => AmountValue = Utils.DecToDb(value, 2);
+        }
+
+        [Column("comment")]
+        public string? Comment { get; set; }
+
+        [ForeignKey("Year")]
+        public virtual Season Season { get; private set; } = null!;
+
+        [ForeignKey("MgNr")]
+        public virtual Member Member { get; private set; } = null!;
+    }
+}