The largest scratch copy is about 8 MB; Docker's default /dev/shm is 64 MB
and shared with the browsers. A reset that empties a folder after the
server's cleanup closed its trash deletes in place instead of starting a
thread nobody stops.
With the database commits gone, throttled resets still stalled in rmtree:
unlinking the last fixture's files waits for their pending writeback. Each
reseed now moves the old output and input folders into <root>/reset-trash
and makes empty ones; a background thread deletes the trash, and the
server's cleanup stops it and removes the rest before the temp root goes.
Vito Sansevero