replace incorrectly calculated postgres_epoch_usecs
replace incorrectly calculated postgres_epoch_usecs

shaneutt/epgsql-1,kivra/epgsql,mabrek/epgsql,KrzysiekJ/epgsql,seabirdzh/epgsql,billiob/epgsql,maximvl/epgsql,epgsql/epgsql,talentdeficit/epgsql