FWIW, there's several firms providing such services for PostgreSQL too. At $previous_company others and I, as a PostgreSQL committers/contributors, provided escalation exactly for such cases. I know they, and others still provide such services. (Not naming names right here, so this doesn't come over as an ad)

Often enough you'll even get similar turn-around times from the community, if you can't (or don't want to) afford such a support contract.