in this case the old configuration was lost, it took an hour to rebuild because tooling normally used to rebuild it for testing was unavailable and building had

in this case the old configuration was lost, it took an hour to rebuild because tooling normally used to rebuild it for testing was unavailable and building had to be done locally, using a single machine someone ssh-ed into, and that just takes a while. Luckily, a person was around who knew how to do the rebuild without fancy tooling.