The collection was declared with exactly the fields it needs -- message,
active, endsAt -- and PocketBase adds no created/updated unless asked.
Both readers sort by -created, so both got 400 for the life of the
feature: the app's NoticeService caught it and swallowed it, and the
dashboard's own listing showed 'zatím žádné' however many notices
existed. Writing worked throughout; nothing could read what was written.
Additive and reversible. created is onCreate only; updated moves on every
save, which costs nothing and is what a pull cursor wants.
