bank account refactor

ReallifeGamemode.Database/BankAccountHolder.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text;
+
+namespace ReallifeGamemode.Database
+{
+  public abstract class BankAccountHolder<T> where T : class, IBankAccount, new()
+  {
+    public abstract string BankAccountName { get; }
+
+    [ForeignKey(nameof(BankAccountId))]
+    public virtual T BankAccount { get; set; }
+
+    public virtual int? BankAccountId { get; set; }
+  }
+}