anchor.diff:    ok.
   
   required_dates(_) ->
  -  {ok, DB0} = pulsedb:open(required_dates_db, <<"test/v2/info">>),
  +  {ok, DB0} = pulsedb:open(required_dates_db, <<"test/v3/required_dates">>),
   
     TicksYesterday = [
       {<<"input">>, 1390224618,  1, [{name, <<"source1">>}]},
  
positive.code:   
    Q5_ = pulsedb_query:remove_tag([from, to], Q1),
    Q5 = pulsedb_query:add_tag([{account, "test@email.com"}, {from, 123}], Q5_),
    <<"sum:10s-avg:ds{account=test@email.com,from=123}">> = pulsedb_query:render(Q5).
negative.code:     replicator,
      % forbid_to_read_after_append,
      % forbid_to_append_after_read,
      info,
      required_dates,
      query_mutation
  