# File lib/ruote/dashboard.rb, line 554
    def leftovers

      wfids = @context.storage.expression_wfids({})

      wis = @context.storage.get_many('workitems').compact
      ers = @context.storage.get_many('errors').compact
      scs = @context.storage.get_many('schedules').compact
        # some slow storages need the compaction... [c]ouch...

      (wis + ers + scs).reject { |doc| wfids.include?(doc['fei']['wfid']) }
    end