anchor.diff:                      {ok, MID};
                   E ->
                       lager:info("[dqe_idx:pg:update/5] Query failed after ~pms:"
  -                               " ~s <- ~p",
  -                               [dqe_idx_pg:tdelta(T0), Q, Vs]),
  +                               " ~s <- ~p: ~p",
  +                               [dqe_idx_pg:tdelta(T0), Q, Vs, E]),
                       E
               end;
           EAdd ->
  
positive.code:                     {ok, MID};
                  E ->
                      lager:info("[dqe_idx:pg:add/5] Query failed after ~pms: "
                                 "~s <- ~p", [dqe_idx_pg:tdelta(T0), Q, Vs]),
                      E
              end;
          EAdd ->
  
negative.code:             ok;
          E ->
              lager:info("[dqe_idx:pg:delete/4] Query failed after ~pms: "
                         "~s <- ~p: ~p", [tdelta(T0), Q, Vs, E]),
              E
      end.
  
  