seems like the upgrade to postgres 12 failed somehow.
Pups::ExecError: /root/upgrade_postgres failed with return #<Process::Status: pid 47 exit 1>
Location of failure: /pups/lib/pups/exec_command.rb:112:in `spawn'
exec failed with the params "/root/upgrade_postgres"
5a74b447cdef6a2db5ea79c2ae1e31f71d1d476179a3f61ea61fc21bf8382229
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.