code: @Override
      public boolean collapseKamNode(KamInfo info, KamNode collapsing, KamNode collapseTo) {
          try {
              KAMUpdateDao updateDao = kamUpdateDao(info);
              return updateDao.collapseKamNode(collapsing, collapseTo);
          } catch (SQLException e) {
              final String fmt = "error collapsing node for %s";
              final String msg = format(fmt, info.getName());
              throw new KAMStoreException(msg, e);
          }
      }
docs: {@inheritDoc}