SALAD: Allow restarting the service without losing connections
Salad is the only service in our infra that cannot be live-restarted, which can be a little tricky when some issues arise as it means we need to wait for all the jobs to be over before we can restart it.
Instead, we could have SALAD make use of systemd's fdstore feature, coupled with a JSON-formated memfd-backed "config" file that maps all the fds we have open to unique resources. This would allow us to restore all the state if SALAD were to crash or be restarted... without any impact on SALAD's clients.