code: func PgNotify(db XODB, v0 string, v1 string) error {
  	var err error
  
  	// sql query
  	const sqlstr = `SELECT pg_catalog.pg_notify($1, $2)`
  
  	// run query
  	XOLog(sqlstr)
  	_, err = db.Exec(sqlstr)
  	return err
  }
docs: // PgNotify calls the stored procedure 'pg_catalog.pg_notify(text, text) void' on db.