SELECT vrevisions.for_vrevisions('
    UPDATE objects_p7 SET part=NULL;
    UPDATE objects_p8 SET part=NULL;
    UPDATE objects_p10 SET part=NULL;
    UPDATE objects_p12 SET part=NULL;
    UPDATE objects_p14 SET part=NULL;

    UPDATE objects_p16 SET part=NULL;
    DROP TABLE objects_p16;
');
