sarhan.alaa added a comment.

  oh yeah sure that won't be running in production like that .. I just was 
wondering if there are any extra optimization here that I could've missed re 
using indexes or using the sub-queries.
  
  re running in batches, sure it should limit deleting to an acceptable 
amount.. and as long as we run frequently enough, then it shouldn't be an issue 
for both retaining deleted data for long nor for performance.
  
  thanks @Addshore for the feedback, I'll submit a production-ready batch to 
get more feedback on a final solution there

TASK DETAIL
  https://phabricator.wikimedia.org/T220150

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To: sarhan.alaa
Cc: sarhan.alaa, Ladsgroup, Addshore, alaa_wmde, Aklapper, JeroenDeDauw, 
Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, 
rosalieper, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331
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