SignalR Hub-2-Hub Communication with SQL Backplane in ASP.NET Owin

I have an ASP.NET Owin Web Api which is load balanced, which means there are multiple instances of it which donĀ“t know each other. The web api hosts a SignalR hub with an SQL Server Backplane (for synchronising between instances), so clients can exchange messages regardless of which instance of the web api they are connected to. Everything working so far.