JeroenDeDauw added a comment.

  The updating optimization ticket <https://phabricator.wikimedia.org/T220169> 
is relevant for this cleanup. We now have two main approaches:
  
  **delete and insert everything**
  Downside: performance penalty for re-inserting things that did not change
  Downside: deleted terms leave unused records, so we need to deal with this 
ticket
  
  **smart update using diff**
  Downside: performance penalty for finding which of the terms are already there
  Note: since we are finding those terms, we likely already have the info we 
need to remove unused records

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

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