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

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

@@ -0,0 +1,11 @@
+namespace MessengerApi.Db.Contracts.Entities
+{
+    public interface IEntity
+    {
+        Guid Id { get; }
+    }
+
+    public interface IEntity<T> : IEntity where T : class, IEntity
+    {
+    }
+}

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

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+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; }
+    }
+}

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

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+using MessengerApi.Db.Contracts.Entities;
+
+namespace MessengerApi.Db.Entities
+{
+    public class User : IEntity<User>
+    {
+        public Guid Id { get; set; }
+
+        public Guid ApiKey { get; set; }
+
+        public string Name { get; set; }
+
+        public bool IsEnabled { get; set; }
+    }
+}

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

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+using MessengerApi.Db.Contracts.Entities;
+
+namespace MessengerApi.Db.Entities
+{
+    /// <summary>
+    /// Describes allowed message route (who can message whom).
+    /// </summary>
+    public class UserRoute : IEntity<UserRoute>
+    {
+        public Guid Id { get; set; }
+
+        public User From { get; set; }
+
+        public User To { get; set; }
+    }
+}