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Backfill `user_central_id` on wmf_content.mediawiki_content_* tables
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Description

In T406515, we added a user_central_id column to mediawiki_content_* tables.

However, this column needs to be backfilled.

In this task we should take care of that, and make sure this is reflected on all the content tables:

  • Backfill user_central_id on wmf_content.mediawiki_content_history_v1
  • Backfill user_central_id on wmf_content.mediawiki_content_current_v1
  • Backfill user_central_id on wmf_content.mediawiki_revision_history_v1