Catch up MSC4354 Sticky Events to remote homeservers that have missed them. - #20165

Draft

reivilibre wants to merge 11 commits into

rei/sticky_events_fed_backlog

Commits on Sep 1, 2026

Replace _TransactionQueueManager with prepare/complete transaction methods
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9f62420
Newsfile
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bec7fc0
Pull out `user_is_local_like_pattern`
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f799796
`unwrap` utility
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Add `destination_room_sticky_events_backlog` table
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b6eecc8
Introduce a StickyEventStreamPosition NewType
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Add store methods
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Wire sticky event backlog transactions into the per-destination queue
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Add mark of backlog after catch-up transaction
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Add tests
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Newsfile
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