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Chuck
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CodeRabbit review on #405 flagged two things in _reinstall_with_rollback, both verified against current code: - Real race: the web UI runs Flask with threaded=True and there's a single update route, so two overlapping requests for the same plugin_id (double-click, two tabs) can interleave. The loser could rename the winner's in-progress install aside mid-download, deleting its own rollback safety net — worse than the bug this function exists to fix. Added a lazy per-plugin_id lock dict (mirrors the plugin_manager per-plugin lock pattern) held for the whole function. - _safe_remove_directory's return value was ignored at both call sites. Stale-aside cleanup failure now aborts cleanly instead of falling through to a rename that would fail anyway with a less useful error; post-success backup-removal failure now logs instead of failing silently (still returns True — the update itself succeeded, and the next update self-heals the leftover aside). Left the third nitpick (test_stale_aside_from_previous_crash_is_cleared) addressed by asserting the stale dir is actually gone and that install_plugin was reached, rather than just the end-to-end result. Added a concurrency regression test asserting install_plugin never runs for the same plugin_id while another call is in flight.