text: var dbm = global.dbm || require('db-migrate');
  var type = dbm.dataType;
  
  exports.up = function(db, callback) {
    db.runSql("alter table participants alter column paymenttoken type VARCHAR(255);",callback);
  };
  
  exports.down = function(db, callback) {
    db.runSql("alter table participants alter column paymenttoken type VARCHAR(7);",callback);
  };
  