def wfids

      wfids = @context.storage.ids('history').collect { |id|
        id.split('!').last
      }.uniq.sort

      wfids.delete('no_wfid')

      wfids
    end
def wfids

      wfids = @context.storage.ids('history').collect { |id|
        id.split('!').last
      }.uniq.sort

      wfids.delete('no_wfid')

      wfids
    end
Returns all the wfids for which there are history items (msgs) stored.