gistfile1.txt

protected override void ConfigureRequestContainer(TinyIoCContainer container, NancyContext context)
{
    var db = container.Resolve<ISisoDatabase>();
    container.Register<ISession>((c, overloads) => new SessionWrapper(db.BeginSession()));
}

public class SessionWrapper : ISession
{
    readonly ISession session;

    public SessionWrapper(ISession session)
    {
        this.session = session;
    }

    public void Dispose() <-- put a breakpoint here, never reached it
    { 
        session.Dispose();
    }

...
}