Fixes following scale tests

migration/castor/castorns_ctamigration_schema.sql

@@ -131,7 +131,7 @@ BEGIN
     raise_application_error(-20000, 'No valid files found on this tape pool, aborting the import');
   END IF;
   ctaLog(inPoolName, 'Intermediate table for files prepared, '|| nbFiles ||' files to be imported. ETA: '||
-                     prettyTime(nbFiles/7000/60));
+                     prettyTime(nbFiles/3400/60));
   EXECUTE IMMEDIATE 'TRUNCATE TABLE CTADeltaDirsHelper';
   -- estimate the last update time of the Dirs_Full_Path snapshot. To be noted that
   -- in case the directory identified by max(fileid) got updated itself, the estimate
@@ -154,12 +154,12 @@ BEGIN
         SELECT path INTO varPath FROM Dirs_Full_Path WHERE fileid = dirIds(i);
         DELETE FROM Dirs_Full_Path
          WHERE path LIKE varPath || '%';
+        COMMIT;
       EXCEPTION WHEN NO_DATA_FOUND THEN
         -- this was a newly created path, will be inserted later
         NULL;
       END;
     END LOOP;
-    COMMIT;
   END IF;
   -- do the selection again, this time with the anti-join to exactly identify
   -- which directories are missing for this export