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The tusd protocol allows DELETE requests ("terminations") at any
point, including after a file has successfully been uploaded. This
can allow tusd to remove a file from the bucket, out from under Zulip.
We use the new-in-2.7.0 pre-terminate hook to look up the file which
the client is requesting to terminate, and reject the termination if
it is a file that the Zulip database is already aware of.