anchor.diff:  		case ocs_log:acct_query(start, TS, TS, '_', '_', '_') of
   			{error, _Reason} ->
   				{error, 500};
  -			{_, Events} ->
  +			{_Cont, Events} ->
   				case lists:keyfind(N, 2, Events) of
   					Event when is_tuple(Event) ->
   						{struct, Attr} = usage_aaa_acct(Event, []),
  
positive.code: 						Headers = [{content_type, "application/json"},
  								{last_modified, Date}],
  						{ok, Headers, Body};
  					_ ->
  						{error, 404}
  				end
  		end
  
negative.code: 						Headers = [{content_type, "application/json"},
  								{last_modified, Date}],
  						{ok, Headers, Body};
  					_Other ->
  						{error, 404}
  				end
  		end
  