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I used the following command to replace the [HEADING] tags that were not converted during the XenForo migration:

sudo -u discourse -H RAILS_ENV=production bundle exec rails runner '
Post.where("raw LIKE ?", "%[HEADING%]").find_each(batch_size: 500) do |p|
  orig = p.raw
  cooked = orig.dup
  (1..6).each do |lvl|
    cooked.gsub!(/\[HEADING=#{lvl}\](.*?)\[\/HEADING\]/mi) { "#" * lvl + " " + $1 }
  end
  cooked.gsub!(/\[HEADING\](.*?)\[\/HEADING\]/mi) { "## " + $1 }
  next if cooked == orig
  p.raw = cooked
  p.save!(validate: false)   # Trigger rebake, but skip validation
end
puts "HEADING tags converted & rebaked."
'
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