The cherry-picked fix from #28605 inverts an existing test (an unknown
non-lobby thread_id no longer rewrites to the most-recent binding), but
that test only seeds two bindings and queries a third thread_id. Add a
second regression test that more closely mirrors the live failure mode:
seed exactly one prior binding, then query a brand-new thread_id and
assert recovery returns None — so the new topic is allowed to get its
own session row instead of being silently merged into the previous
topic's session.
Co-authored-by: Fábio Siqueira <fabioxxx@gmail.com>
Co-authored-by: dillweed <dillweed@users.noreply.github.com>
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