So today I discovered that there's a cron job that holds non-reproducible state that died, and now our system is fucked.
The cron job doesn't live inside any source control. This morning it entered a terminal state, and because it overwrites its state there's no way to revert it.
I'm currently waiting for the database rollback and have rewritten it in a reproducible/idempotent way.
It's not horrible, like it'll do the job just fine, it's just probably a better idea to use systemd and like, containers and whatnot, but I couldn't be arsed to fiddle with all that for Jellyfin, caddy reverse proxy, and two modded Minecraft servers, so shell scripts and tmux won the day. It takes a little extra time to restart everything after an update, and maybe I'll get the motivation to do things "correctly™" one day, but today is not that day.
Use the tmux resurrect plugin. It will restore your tmux session to its previous state after a restart, including programs if you like.
You can put off doing things "correctly™" even longer.
The "here's how you keep doing this poorly but more efficiently" energy on display here is a refreshing change of pace from the usual "here's how you do this correctly" crap peddled by normies (including me). You have my respect.
If you're going to do something wrong, do it wrong right.
thank you very much for the detailed response :)