in oc_share:
  for these 'id': 82 84 86 91 184 185 186
    changed 'uid_owner' and 'uid_initiator' to "boni"
  for these 'id': 190 205 219 220 221
    changed 'uid_owner' and 'uid_initiator' to "boutil"

copied content of /var/local/stuffcloud-data/boni/gallery/29827636-6ca4-1032-90bf-157529423ee4
  into /var/local/stuffcloud-data/boni/gallery/boni/
  with a pre-backup of target into '/root/stuffcloud_gallery_boni_boni'
  (some files/dirs were only on one side and sometimes on both)
  and moved dir aside as '/root/stuffcloud_gallery_boni_uuid'

nothing to be done for 643f834c-79bd-1032-884a-6141827ed31c

./occ files:scan --all
…
Starting scan for user 11 out of 89 (boni)
PHP Fatal error:  Call to a member function getCache() on null in /srv/www/sites/milkypond/stuff.milkypond.org/nextcloud-11.0.2/apps/files_sharing/lib/Cache.php on line 73

(for boni)
in oc_filecache, changed 'storage' from 7 to 18 and remove 7 from oc_filecache and oc_storages
-> duplicates
UPDATE `oc_filecache` as fc1 SET fc1.storage=18 WHERE fc1.storage=7 AND fc1.path_hash NOT IN (select res.path_hash from (select fc2.path_hash FROM oc_filecache as fc2 WHERE fc2.storage=18) as res)
=> 1 row affected
update oc_mounts accordingly

(for boutil)
same problem with 9->13

(for pilou)
same problem with 48->10
cannot find user but related to boni family, could not find files on fs
pilou said it is his

removed a few unused storages

# ~1h30
./occ files:scan --all
./occ files:cleanup