fix User duplication in ghcr #ruby

fix_duplication.rb

duplicates = User.group(:username).having("count(*) > 1").count
duplicates.each do |username, count|
  next if username.blank?
  users = User.where(username: username).order("updated_at DESC")
  first = users.shift
  user_ids = users.map(&:id)
  Event.where(reviewer_id: user_ids).update_all(reviewer_id: first.id)
  [:author_id, :committer_id, :last_reviewer_id].each do |field|
    Commit.where(field => user_ids).update_all(field => first.id)
  end

  users.map(&:destroy)
end