void AddOrUpdateStreamsToLoadWith(Dictionary<byte[], long> streamsToLoad, ActivityStream stream, long timestamp = 0)
{
if (streamsToLoad.ContainsKey(stream.StreamId))
{
if (streamsToLoad[stream.StreamId] < timestamp)
streamsToLoad[stream.StreamId] = timestamp;
}
else
streamsToLoad.Add(stream.StreamId, timestamp);
MarkAsCrowled(stream);
}
}