anchor.diff:          {From, {stop}} ->
               From ! {ok, self()},
               {ok}
  -    %% sync aggregator db periadically
  -    after 600000 ->
  +    %% sync aggregator db periodically
  +    after ?DEF_SYNC_FEEDS ->
               sync_db(),
               loop()
       end.
  
positive.code:                 [#feed{source=Source, content=Content}] ->
                      {Meta, Items} = Content,
                      %% reduce feed output to 20 items
                      ReducedItems = lists:sublist(Items, 20),
                      {Meta, ReducedItems}
              end
      end.
  
negative.code: -include("mf.hrl").
  
  -export([start/0, read/1, sync_db/0, sync_query/2]).
  
  -define(DEF_NUM_OF_ITEMS, 20).
  -define(DEF_SYNC_FEEDS, 120*60*1000).
  
  %%------------------------------------------------------------------------------
  %% @spec start() -> {ok, AggregatorPid} | {error, Reason}
  