update_position returned quietly when no field differed, and the interface
answered "Planstelle geändert." — a confirmation for something that had not
happened. It now raises, and the message says so.
This is reachable without the user doing anything wrong: the chief checkbox
is dropped on the way out when the unit already has a chief position, so a
save consisting only of that tick arrives as an empty change set. The reply
was a green toast and an unchanged list, which sends someone looking in the
wrong place.
It also separates the two explanations for "I saved and nothing happened",
which is why it went in now: an empty change set is refused in red, so a
green confirmation with a stale card can only mean the page did not reload.
Verified against the live database: an unchanged payload is refused, a
changed one goes through.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Maximilian Stubhan
0d8af7cdf0