element-hq / element-hq/synapse
Implement MSC3944 to delete stale to-device messages
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- Python
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Description
This issue has been migrated from [#16082](https://github.com/matrix-org/synapse/issues/16082).
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[MSC3944](https://github.com/matrix-org/matrix-spec-proposals/pull/3944) defines some conditions where it is *safe* to delete "stale" to-device messages. See the MSC for specifics on when this is true.
See #15842 for a potential implementation.
This will help with #3599, but it is unclear how much.
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