jcrespo added a comment.

We identify and delete duplicate rows (not trivial, but not difficult either), then we add a UNIQUE restriction over that combination of columns so that never happens again.


TASK DETAIL
https://phabricator.wikimedia.org/T163551

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To: hoo, jcrespo
Cc: Lydia_Pintscher, Krinkle, Ladsgroup, gerritbot, daniel, Smalyshev, jcrespo, aude, Aklapper, hoo, Lordiis, GoranSMilovanovic, Adik2382, Th3d3v1ls, Ramalepe, Liugev6, QZanden, Lewizho99, Maathavan, Izno, Wikidata-bugs, Mbch331
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