[Seaside] Equivalent of unique keys in a persistent object model ?

[recursive68 at gmail.com]

Hi,

I'm a newby to ST and Seaside. I attempting to port web app that's written
in Oracle/Java over to Seaside running on Pharo. The current application
uses Oracle sequence generated unique id's for unique identifiers for
records, is there a parallel to this when using just objects persisted in
the Pharo image ? I know I can code my one implementation to replicate this
but wondered whether this is the best way to model it, what are the
alternatives and if it is the best way, is there a ready made package that I
could use to generate unique id's ?

TIA
Jon
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