discourse/app/jobs/onceoff/migrate_upload_extensions.rb

# frozen_string_literal: true

module Jobs
  class MigrateUploadExtensions < ::Jobs::Onceoff
    def execute_onceoff(args)
      Upload.find_each do |upload|
        upload.extension = File.extname(upload.original_filename)[1..10]
        upload.save
      end
    end
  end
end