             $set   : isFull : no
           , ->
             log "activity removed from cache!", Object.keys(cache.activities).length
+            cache.update
+              $pullAll : { overview : [null] }
+            , ->
+              log "nulls in cache.overview removed"
+
             if Object.keys(cache.activities).length is 0
               cache.remove ->
                 log "cache instance removed!"


            cacheQueue.push ->
              latest.cap remainderOverview, ->
                console.log "capped latest!"
                cacheQueue.next()

            # terminate only if there are no new items to be cached

  @before = (timestamp, callback)->

    selector =
      to     : { $lt : new Date parseInt(timestamp,10) }

    @one selector, defaultOptions, (err, cache)-> kallback err, cache, callback

