CategoryEditsRepo: use linktarget tables and improve performance #599
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The Toolforge replicas still supported the categorylinks.cl_to column but it was incredibly slow. This commit switches to using the new linktarget table and the foreign key categorylinks.cl_target_id
In my testing, performance is best when querying for the link target IDs first, even though the query plan looks worse than JOINing on linktarget.