✅ [SignalR] How to effeciently keep track of ConnectionIds.

public class ChatHub : Hub
{
    private readonly IConnectionManager _connectionManager;

    public ChatHub(IConnectionManager connectionManager)
    {
        _connectionManager = connectionManager;
    }

    public async Task SendMessage(UserChatHubDTO user, string message)
    {

        await Clients.All.SendAsync("ReceiveMessage", user, message);

    }
    public void RegisterUser(UserChatHubDTO user)
    {
        _connectionManager.AddConnection(Context.ConnectionId, user);
    }

    public override async Task OnDisconnectedAsync(Exception exception)
    {
        _connectionManager.RemoveConnection(Context.ConnectionId);
        await base.OnDisconnectedAsync(exception);
    }
}