Initial commit carried over from private repo. This is V2.

code/MessengerApi.Db.Contracts/Entities/Message.cs

@@ -0,0 +1,25 @@
+using MessengerApi.Db.Contracts.Entities;
+
+namespace MessengerApi.Db.Entities
+{
+    public class Message : IEntity<Message>
+    {
+        public Guid Id { get; set; }
+
+        public DateTime CreatedUtc { get; set; }
+
+        public Guid FromId { get; set; }
+
+        public Guid ToId { get; set; }
+
+        public bool IsDelivered { get; set; }
+
+        public bool IsAcknowledged { get; set; }
+
+        public string PayloadType { get; set; }
+
+        public string Payload { get; set; }
+
+        public int? PayloadLifespanInSeconds { get; set; }
+    }
+}