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Prune expired in-memory message board registry entries - #47952
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## Why Dropping the last board handle releases its state but leaves a stale entry in `InMemoryMessageBoards`, allowing registry entries to accumulate across sessions. ## What changed Prune entries whose state has no remaining strong references whenever a board is opened, while preserving shared state for live boards. ## Testing Add a regression test that repeatedly opens and drops boards, checks that expired entries are removed, and verifies that reopening a live board shares its state. GitOrigin-RevId: c3f1c27b42ee17915f0ece01b85a22d0fdf632ce
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Prune expired in-memory message board registry entries
Why
Dropping the last board handle releases its state but leaves a stale entry in
InMemoryMessageBoards, allowing registry entries to accumulate across sessions.What changed
Prune entries whose state has no remaining strong references whenever a board is
opened, while preserving shared state for live boards.
Testing
Add a regression test that repeatedly opens and drops boards, checks that expired
entries are removed, and verifies that reopening a live board shares its state.