Problem: There is a dataset held on a server. A number of clients should connect to the server (ideally via web, but the protocol doesn't matter so much), issue a request for a subset of the data based upon a timestamp which will be the changes in the dataset since that client's last request and the server will then provide those changes as a list in timestamp order (JSON would be good but again whatever works is fine).

Now, I can code this up (and was about to do just that) but it strikes me that this must be a solved problem and the virtue of laziness appeals to me. However, even though such a solution surely already exists in the CPAN it is eluding me.

Please can anyone suggest an already available solution (ideally both client and server ends, but I'd be happy enough with just the server side)? Thanks for any and all suggestions.

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