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

code/MessengerApi/Models/CachedIdentity.cs

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+using System.Security.Claims;
+
+namespace MessengerApi.Models
+{
+    public class CachedIdentity
+    {
+        public Db.Entities.User User { get; set; }
+
+        public Db.Entities.UserRoute[] UserRoutes { get; set; }
+
+        public ClaimsPrincipal ClaimsPrincipal { get; set; }
+    }
+}

code/MessengerApi/Models/Http/AckRequest.cs

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+namespace MessengerApi.Models.Http
+{
+    public class AckRequest
+    {
+        public Guid MessageId { get; set; }
+    }
+}

code/MessengerApi/Models/Http/SendRequest.cs

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+namespace MessengerApi.Models.Http
+{
+    public class SendRequest
+    {
+        public Guid? ToUserId { get; set; }
+
+        public string Payload { get; set; }
+
+        public string PayloadType { get; set; }
+
+        public int? PayloadLifetimeInSeconds { get; set; }
+    }
+}

code/MessengerApi/Models/Http/VerifyRequest.cs

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+namespace MessengerApi.Models.Http
+{
+    public class VerifyRequest
+    {
+        public Guid MessageId { get; set; }
+    }
+}

code/MessengerApi/Models/Scoped/Identity.cs

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+namespace MessengerApi.Models.Scoped
+{
+    public class Identity
+    {
+        public Db.Entities.User User { get; set; }
+        
+        public Db.Entities.UserRoute[] UserRoutes { get; set; }
+    }
+}

code/MessengerApi/Models/Scoped/Timing.cs

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+namespace MessengerApi.Models.Scoped
+{
+    public class Timing
+    {
+        public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+    }
+}

code/MessengerApi/Models/Scoped/UnitOfWork.cs

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+using MessengerApi.Contracts.Factories;
+using MessengerApi.Contracts.Models.Scoped;
+using MessengerApi.Db;
+using MessengerApi.Db.Contracts.Repositories;
+using MessengerApi.Db.Repositories;
+
+namespace MessengerApi.Models.Scoped
+{
+    public class UnitOfWork : IUnitOfWork
+    {
+        private MessengerDbContext context;
+
+        public IUserRepository Users { get; }
+
+        public IUserRouteRepository UserRoutes { get; }
+
+        public IMessageRepository Messages { get; }
+
+        public UnitOfWork(
+            IDbContextFactory dbContextFactory)
+        {
+            this.context = dbContextFactory.CreateDbContext();
+            this.Users = new UserRepository(this.context.Users);
+            this.UserRoutes = new UserRouteRepository(this.context.UserRoutes);
+            this.Messages = new MessageRepository(this.context.Messages);
+        }
+
+        public Task SaveChanges(CancellationToken ct = default)
+        {
+            return this.context.SaveChangesAsync(ct);
+        }
+    }
+}

code/MessengerApi/Models/UserSetupItem.cs

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+namespace MessengerApi.Models
+{
+    public class UserSetupItem
+    {
+        public string UserName { get; set; }
+
+        public string ApiKey { get; set; }
+
+        public string[] CanSendToUserNames { get; set; }
+    }
+}