added object inheritance.

Models/UpgradeRecord/UpgradeRecord.cs

@@ -1,14 +1,6 @@
 namespace CarCareTracker.Models
 {
-    public class UpgradeRecord
+    public class UpgradeRecord: GenericRecord
     {
-        public int Id { get; set; }
-        public int VehicleId { get; set; }
-        public DateTime Date { get; set; }
-        public int Mileage { get; set; }
-        public string Description { get; set; }
-        public decimal Cost { get; set; }
-        public string Notes { get; set; }
-        public List<UploadedFiles> Files { get; set; } = new List<UploadedFiles>();
     }
 }