I hate to tell you this but they migrated to MySQL a long time ago to be able to scale. Also relevant: https://www.uber.com/blog/postgres-to-mysql-migration/ h

I hate to tell you this but they migrated to MySQL a long time ago to be able to scale. Also relevant: https://www.uber.com/blog/postgres-to-mysql-migration/ https://www.uber.com/blog/postgres-to-mysql-migration/