Refactoring

* refactoring
* fixes
* messages
* new interface

SeniorAssistant/Models/Interfaces/IHasMessage.cs

@@ -0,0 +1,14 @@
+using LinqToDB.Mapping;
+using System;
+
+namespace SeniorAssistant.Models
+{
+    public interface IHasMessage : IHasTime
+    {
+        string Receiver { get; set; }
+
+        string Body { get; set; }
+
+        DateTime Seen { get; set; }
+    }
+}