Schema changelog
A permanent, dated log of every change we observe in the upstream data format — a new grade key, a field that changes shape, a value that arrives in the wrong unit. No official log exists, so this one is kept for anyone else parsing the same file.
Watching since
Looking for what changed on this site rather than in the file? That is what's new.
Nothing observed yet
The format has not changed across 228 readings. An empty log means we have seen it hold, not that it is stable.
Entries appear here when they happen, dated, and are not edited afterwards. If you parse the same file and have seen something we have not, tell us — this log is more useful to you than to us, and it is worth more when it is not only ours.