Retyping two paths and nine checkboxes correctly every time is where the
mistakes come from, and "one-off" described how a transfer is scheduled rather
than how often it is run. Pinned entries are exempt from the rotation — the
command used twice a year is both the most worth keeping and the first that ten
ordinary runs evict. Stored server-side, so the list is there from any screen,
and loading one fills the form and stops rather than running it.
Unraid already enforces CSRF on every POST via auto_prepend, but its
injector is jQuery-only — the plugin's native fetch() calls carried no
token and were being terminated before the endpoint ran, silently,
because csrf_terminate exits with an empty body that r.json() swallows.
Writing down what each endpoint actually guarantees made the places it
didn't obvious — shell arguments reaching a crontab or a bash -c
unescaped, master.conf written without tmp+rename, and conf edits that
could be saved without ever being parsed.