After someone in IRC asked if there was an equivalent to MySQL's
server_id, it was noted that we do have a system identifier but it's not
very accessible.

The attached patch implements a pg_system_identifier() function that
exposes it.
Would it make sense for such identifiers be standard UUID

Should there be a UUID per cluster? and/or per database, possibly deduce
from the cluster one? Should it be configurable, say from


Note that there is a set of uuid functions provided as a module that may


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