Purge all ran on the UGC server's main thread inside the dashboard's
request: it measured and deleted every stored folder, then updated rows one
by one, and the main thread (downloads, the master link, the database)
waited minutes for it. Now a purge answers at once and a file thread lists,
measures and deletes the folders; the main thread applies what it removed
and updates the rows a few hundred a tick. No new item is started while a
purge runs, and items being made when it starts are left alone, so no worker
writes into a folder being deleted. One purge at a time. The storage cap's
clean-up lists and deletes on the same thread. The UGC page shows the
purge's progress (/status purge).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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