WiP storage for modules

Core/Data/BotUser.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace Kruzya.TelegramBot.Core.Data
+{
+    public class BotUser
+    {
+        /// <summary>
+        /// The unique bot user identifier.
+        /// </summary>
+        [Key]
+        public Guid BotUserId { get; set; }
+        
+        /// <summary>
+        /// The chat identifier where this user is related.
+        /// </summary>
+        public long ChatId { get; set; }
+
+        /// <summary>
+        /// The Telegram User identifier.
+        /// </summary>
+        public int UserId { get; set; }
+    }
+}

Core/Data/BotUserValue.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.IO;
+using System.Runtime.Serialization.Formatters.Binary;
+
+namespace Kruzya.TelegramBot.Core.Data
+{
+    public class BotUserValue
+    {
+        [Key]
+        public Guid BotUserValueId { get; set; }
+        
+        public BotUser BotUser { get; set; }
+        public string Name { get; set; }
+        
+        public byte[] Value
+        {
+            get
+            {
+                var fmt = new BinaryFormatter();
+                using var memStream = new MemoryStream();
+                fmt.Serialize(memStream, data);
+                
+                return memStream.ToArray();
+            }
+            set
+            {
+                var fmt = new BinaryFormatter();
+                using var memStream = new MemoryStream();
+                memStream.Write(value);
+                memStream.Position = 0;
+
+                data = fmt.Deserialize(memStream);
+            }
+        }
+
+        [NonSerialized] public object data;
+        
+        public T GetValue<T>() => (T) data;
+        public void SetValue<T>(T value) => data = value;
+    }
+}

Core/Data/CoreContext.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace Kruzya.TelegramBot.Core.Data
+{
+    public class CoreContext : DbContext
+    {
+        /// <summary>
+        /// The all known users.
+        /// </summary>
+        public DbSet<BotUser> Users { get; set; }
+        
+        public DbSet<BotUserValue> UserValues { get; set; }
+
+        public CoreContext(DbContextOptions<CoreContext> ctx) : base(ctx)
+        {
+            Database.Migrate();
+        }
+    }
+}