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Fix deleting of old highlight notifications #15519
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Mentioned in #6060 (comment), not sure if this fully fixes #6060 or not though? |
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Oh wait, le sigh, we don't actually add highlights to the summary table. |
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In #13118 we accidentally stopped deleting old highlight notifications, and instead only deleted non-highlight notifications.
While we're here we also enforce that we use index scans (rather than seq scans), which we also do for state queries. The reason to enforce this is that we can't correctly get PostgreSQL to understand the distribution of
stream_orderingdepends onhighlight, and so it always defaults (on matrix.org) to sequential scans. This was especially exacerbated by us keeping old highlight notifications around.