The previous commit raised Delete All's barrier inside the exclusive
authority reset and drained queued writes there, but a queued deletion
or import takes the shared side of that lock: the reset waited for it
while it waited for the reset.
Delete All drains the writes queued before it outside the lock again,
then takes the reset, with its barrier up from the start. The deadlock
with a Stalker repair (or Edit) that holds a row reservation and writes
under it is broken on the other side: such a write does not wait for
the barrier (holdsPlaylistAuthority, counted per reservation in this
context), and the reset waits for the reservation as before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
