You'd need to do that with a container too, if the volume mount for /var/lib/posgresql/data still has the older version of posgres data then if you update the c

You'd need to do that with a container too, if the volume mount for /var/lib/posgresql/data still has the older version of posgres data then if you update the container then that needs to be done too. Alternatively a dump and reimport.