telegram-bot/Core/Data/BotUser.cs

using System;
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 long UserId { get; set; }
    }
}