Provider shutdown() only called manager.flush_all(), which drains the
queue but never joins the async-writer thread — manager.shutdown()
exists and nothing called it. The writer thread could still be blocked
in httpx I/O at interpreter exit (the #37632 crash class). Now
shutdown() calls manager.shutdown() (flush + join) when persistence is
enabled, and a new manager.stop_async_writer() (join only, no flush)
when saveMessages is false, so containment and clean teardown compose.
Erosika
9cfff1546d