Unlike the MySQL schema, redirect.rd_from is not a primary key in the PostgreSQL schema. In fact, there is no unique key for the redirect table so there might be a lot of duplicate rows (which I just witnessed).
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Event Timeline
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptAug 18 2018, 7:35 PM2018-08-18 19:35:10 (UTC+0)
Krinkle moved this task from Untriaged to Schema changes on the MediaWiki-libs-Rdbms board.Sep 17 2018, 4:01 PM2018-09-17 16:01:25 (UTC+0)
Krinkle edited projects, added MediaWiki-Redirects, Schema-change, patch-welcome; removed MediaWiki-libs-Rdbms.Jul 18 2019, 8:26 PM2019-07-18 20:26:13 (UTC+0)
DannyS712 moved this task from General to Database on the MediaWiki-Redirects board.Nov 22 2019, 7:13 AM2019-11-22 07:13:41 (UTC+0)
Reedy moved this task from Unsorted to Change on the Schema-change board.Feb 24 2020, 6:41 AM2020-02-24 06:41:51 (UTC+0)