public void Detach(byte[] sourceStreamId, byte[] streamIdToDetach, long detachedSince)
{
var prepared = session.Prepare(StoreFeedStreamQueryTemplate);
var sid = Convert.ToBase64String(sourceStreamId);
var asid = Convert.ToBase64String(streamIdToDetach);
long ts = detachedSince == ActivityStream.DefaultExpirationTimestamp ? 0 : detachedSince;
session
.Execute(prepared
.Bind(sid, asid, ts));
}