convert.rb

class TempToRuby < Delayed::PsychExt::ToRuby
  def visit_Psych_Nodes_Mapping(object)
    if %r{^!ruby/object:ActiveRecord::AttributeSet}.match(object.tag.to_s)
      {}
    elsif %r{^!ruby/object:(.+)$}.match(object.tag.to_s)
      klass = resolve_class(Regexp.last_match[1])
      if klass < ActiveRecord::Base
        payload = Hash[*object.children.map { |c| accept c }]
        id = payload['raw_attributes'][klass.primary_key]
        klass.unscoped.find(id)
      else
        super
      end
    else
      super
    end
  end
end

job = Delayed::Job.find(bad_job_id)
job.payload_object = TempToRuby.create.accept(Psych.parse(job.handler))
job.save