Heroku support answered my support ticket within a few hours (so good on them) with a canned response that pointed me to the article I had already referenced to them (not so good) and some hand waving "we're working on it." How they deploy this without figuring out a migration path first is beyond me. Someone... must have brought this up internally and been shot down I guess?

The issue they say this was to mitigate is this CVE https://www.postgresql.org/about/news/postgresql-145-138-121... which seems extraordinarily difficult to exploit (oh, and they don't address in already active databases... so....).

Very much throwing the baby out with the bathwater.

Plus the "we're shutting down all your stuff" message today makes me scrambling for another service.