Scratch for running next callbacks in queue

Core/Data/CoreContext.cs

@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
 
 namespace Kruzya.TelegramBot.Core.Data
@@ -11,6 +12,18 @@ namespace Kruzya.TelegramBot.Core.Data
         
         public DbSet<BotUserValue> UserValues { get; set; }
 
+        public override void Dispose()
+        {
+            SaveChanges();
+            base.Dispose();
+        }
+        
+        public override ValueTask DisposeAsync()
+        {
+            SaveChanges(); 
+            return base.DisposeAsync();
+        }
+
         public CoreContext(DbContextOptions<CoreContext> ctx) : base(ctx)
         {
             Database.Migrate();

Core/Extensions/RepositoryExtension.cs

@@ -1,6 +1,7 @@
 using System.Threading.Tasks;
 using Kruzya.TelegramBot.Core.Data;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
 
 namespace Kruzya.TelegramBot.Core.Extensions
 {
@@ -48,6 +49,23 @@ namespace Kruzya.TelegramBot.Core.Extensions
 
         #region Core-context repository extensions
 
+        #region BotUser
+
+        public static async Task<BotUser> FindOrCreate(this DbSet<BotUser> repository, long chatId, int userId)
+        {
+            var user = await repository.SingleOrDefaultAsync(e => e.ChatId == chatId && e.UserId == userId);
+            if (user == null)
+            {
+                user = repository.Create();
+                user.ChatId = chatId;
+                user.UserId = userId;
+            }
+
+            return user;
+        }
+
+        #endregion
+        
         #region BotUserValue
 
         #region FindOption
@@ -79,6 +97,7 @@ namespace Kruzya.TelegramBot.Core.Extensions
             if (opt == null)
             {
                 opt = repository.Create();
+                opt.BotUser = await repository.GetService<CoreContext>().Users.FindOrCreate(chatId, userId);
             }
 
             return opt;

Core/GeneralHandler.cs

@@ -39,6 +39,8 @@ namespace Kruzya.TelegramBot.Core
 
                 await VerifyChatPair(message);
             }
+            
+            throw new ArgumentException();
         }
 
         public async Task VerifyChatPair(Message message)