Error adding new node_queue item - need to create sequence

The installation in postgres schema doesn't work, use in nodequeue.install following ddl-statements:

    case 'pgsql':
        db_query("CREATE TABLE {nodequeue_queue} (
          qid int4 NOT NULL PRIMARY KEY,
          title varchar(255) NOT NULL,
          size int4 default '0'
        )");

        db_query("CREATE TABLE {nodequeue_roles} (
          qid int4 NOT NULL,
          rid int4 
        )");

        db_query("CREATE TABLE {nodequeue_types} (
          qid int4  NOT NULL,
          type varchar(255)
        )");

        db_query("CREATE TABLE {nodequeue_nodes} (
          qid int4 NOT NULL,
          nid int4,
          position int4
        )");
      $success = TRUE;
      break;