Removing a provider key, like setting one, left no audit row, unlike
every other credential change. Each key slot a PATCH touches now writes
user.ai-provider.key.set or .remove with the slot and never the value.
Every personal provider form showed a stored key and offered no way to
take it back, since saving with an empty key field keeps the stored one.
The OpenAI, Anthropic, local model and gateway forms now carry a
confirmed "Remove API key" while a key is stored. It sends the existing
PATCH /api/user/ai-provider with that one key as null, which clears the
column and leaves the provider choice, model and the other keys alone.
Marc-André Bombeck