code: function (conn, cb) {
              if (LOG_DEBUG) {
                  console.log("BEGIN tearDown");
              }
              
              if (typeof conn == 'function') {
                  cb = conn;
                  conn = null;
              }
              if (!conn) {
                  connections = {};
                  return cb();
              }
              if (!connections[conn])
                  return cb();
              delete connections[conn];
              cb();
          }
docs: OK
  Fired when a model is unregistered, typically when the server
  is killed. Useful for tearing-down remaining open connections,
  etc.
  
  @param  {Function} cb [description]
  @return {[type]}      [description]
   Teardown a Connection OK