Here is where I get uncertain as to if this is possible. My idea is to
create a pseudo type that triggers the creation of it's lookup tables
the same way the SERIAL type triggers creation of a sequence and returns
an int with the right default value.
Personnally I use one table which has columns (domain, name) and which
stores all enum values for all different enums.
I have then CHECK( is_in_domain( column, 'domain_name' )) which is a
simple function which checks existence of the value in this domain (SELECT
1 FROM domains WHERE domain=$2 AND name=$1 LIMIT 1) for instance.
You can also use integers.
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