I did previously observe seq scans on potmsgset as well, but on further inspection those were from an experimental query where I'd lifted part of the TranslationTemplateItem join out to a CTE and made some other possible simplifications, so not quite applicable here.
I did previously observe seq scans on potmsgset as well, but on further inspection those were from an experimental query where I'd lifted part of the TranslationTemp lateItem join out to a CTE and made some other possible simplifications, so not quite applicable here.