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Yeah, we do this too in Arvados (https://arvados.org). All our uuids consist of three parts separated by a hyphen. The first part denotes the cluster, the middle part denotes the type of object, and the last part is a random string. E.g.

  qr1hi-j7d0g-a68mg4e5oh37oek
where 'qr1hi' is the cluster identifier, 'j7d0g' means 'project', and 'a68mg4e5oh37oek' is a unique identifier.



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