Map envelope DocResult and expose burned-state indicator

EnvelopeGenerator.Domain/Entities/Envelope.cs

@@ -137,7 +137,6 @@ namespace EnvelopeGenerator.Domain.Entities
             = false;
 #endif
 
-        [NotMapped]
         [Column("DOC_RESULT")]
         public byte[]
 #if nullable

EnvelopeGenerator.Domain/Interfaces/IEnvelope.cs

@@ -3,6 +3,12 @@
     public interface IEnvelope
     {
         int? EnvelopeTypeId { get; set; }
+
+        byte[]
+#if nullable
+            ?
+#endif
+            DocResult { get; }
     }
 
     public static class EnvelopeExtensions
@@ -16,5 +22,10 @@
         {
             return envelope.EnvelopeTypeId != 2;
         }
+
+        public static bool IsBurned(this IEnvelope envelope)
+        {
+            return envelope.DocResult != null;
+        }
     }
 }