public async Task <Session> StartOrJoin(StartJoinSessionRequest request)
        {
            if (string.IsNullOrEmpty(request.SessionId))
            {
                //Create Session
                var session = new Session();
                if (request.User != null)
                {
                    session.Users.Add(request.User);
                    await _context.AddAsync(session);

                    await _context.SaveChangesAsync();
                }
                return(session);
            }
            else
            {
                //Look up and join session
                var session = await _context.FindAsync <Session>(request.SessionId);

                session.Users.Add(request.User);
                _context.Update(session);
                await _context.SaveChangesAsync();

                return(session);
            }
        }
        public async Task SendPoints(string sessionId, string userId, int points)
        {
            var entity = _context.Sessions.FirstOrDefault(item => item.Id == sessionId);

            entity.Users.Find(u => u.Id == userId).Points = points;
            _context.Entry(entity).State = Microsoft.EntityFrameworkCore.EntityState.Detached;
            _context.Update(entity);
            await _context.SaveChangesAsync();

            await Clients.All.SendAsync("ReceivePoints", userId, points);
        }