presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/MetadataDao.java/MetadataDao/blockMaintenance
class MetadataDao:    @SqlUpdate("UPDATE tables SET maintenance_blocked = CURRENT_TIMESTAMP\n" +
            "WHERE table_id = :tableId\n" +
            "  AND maintenance_blocked IS NULL")
    void blockMaintenance(@Bind("tableId") long tableId);