WITH RECURSIVE
cte AS ( SELECT id id_from, id id_to, obj, punct AS path, in_out
         FROM table1
         WHERE in_out = 'вх' 
         UNION ALL
         SELECT cte.id_from, table1.id, cte.obj, CONCAT(cte.path, table1.punct), table1.in_out
         FROM table1
         JOIN cte ON table1.obj = cte.obj AND table1.id = cte.id_to + 1
         WHERE COALESCE(cte.in_out, '') != 'вых' )
SELECT id_from, id_to, obj, path
FROM cte
WHERE in_out = 'вых'
ORDER BY id_from, path;