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That would be very interesting. Does it get updated in realtime and scale to millions of users?

No idea about millions, but I remember Simon saying something like it running happily at (IIRC) 60second intervals. Hopefully he'll elaborate.

only on odd days of the week.

On even days it works in the future, and scales to 1000/i/ users. SimonW, well connected with the timelords, or Harry Potter... not sure which ;-)