Given that this seems to have slipped off the hackers radar (or in too hard
basket) I have constructed a horrible solution.
I will stop using autovacuum for this relation , I will use our own system
to monitor the relation, and I will reset pgclass.reltuples on this relation
after vacuum is done to the correct value.
I note that vacuum.c has comments in vac_update_relstat that changes to
pg_class are done without a transaction. Are there dangers of my doing an
update pg_class set reltuples=6 where relkind='r' and
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