Over in pgsql-hackers, I've proposed removing the db_user_namespace
parameter in v17 [0]. I am personally not aware of anyone using this
parameter, but I wanted to give folks an opportunity to object in case they
are using it (or are aware of someone who is).
[0] https://postgr.es/m/20230630200509.GA2830328%40nathanxps13
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Nathan Bossart
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