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Scanning for all possible invalid post_timing records in the destination topics can be a very expensive operation. The main aim is to avoid the data clashing with soon-to-be-moved posts, so we can reduce the scope of the query by targeting only rows which would actually cause a clash. post_timings has an index on (topic_id, post_number), so this is very fast. On an example site, this reduced the query from ~6s to <10ms |
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