anchor.diff:  
   -module(couch_peruser).
   -behaviour(gen_server).
  --behaviour(config_listener).
   
   -include_lib("couch/include/couch_db.hrl").
   
  
positive.code: -export([start_link/0, init/1, handle_call/3, handle_cast/2, handle_info/2,
           terminate/2, code_change/3]).
  
  % config_listener callbacks
  -export([handle_config_change/5, handle_config_terminate/3]).
  
  -export([init_changes_handler/1, changes_handler/3]).
  
  -record(state, {parent, db_name, delete_dbs, changes_pid, changes_ref}).
  
  
  start_link() ->
  
negative.code: 
  code_change(_OldVsn, State, _Extra) ->
      {ok, State}.
  