Nextcloud upgrade to 34.0.2 failed and removed 34.0.1

@Cys Just create the .ncdata file in /home/yunohost.app/nextcloud/data/

yunohost app shell nextcloud
nano /home/yunohost.app/nextcloud/data/.ncdata
# You can add the following content : # Nextcloud data directory
exit
sudo chmod 640 /home/yunohost.app/nextcloud/data/.ncdata

OK, I should have try this but I wasn’t sure an empty file could work.

So I went a bit ahead ans here is the ouput of php occ maintenance:repair :
(…)
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  • ERROR: An exception occurred while executing a query: SQLSTATE[42S02]: Base table or view not found: 1146 Table ‘nextcloud.oc_vcategory’ doesn’t exist

  • Repair invalid shares

    • ERROR: An exception occurred while executing a query: SQLSTATE[42S02]: Base table or view not found: 1146 Table ‘nextcloud.oc_share’ doesn’t exist

Move .step file of updater to backup location
(…)

  • Invalidation not required
  • Cache the user display names
    • ERROR: An exception occurred while executing a query: SQLSTATE[42S02]: Base table or view not found: 1146 Table ‘nextcloud.oc_talk_attendees’ doesn’t exist
  • Fix the namespace in database tables
    • ERROR: An exception occurred while executing a query: SQLSTATE[42S02]: Base table or view not found: 1146 Table ‘nextcloud.oc_talk_attendees’ doesn’t exist
  • Regenerate signaling keys

(…)

I tried again Nextcloud upgrade after that but it failed. I’m afraid missing tables are required to run the upgrade (but why are they missing in the backup ?..).
I tried to access the Nextcloud URL but I only have a 404 Not Found of nginx displayed.

I don’t want to waste your time (thank again for your help), I think I will restart from scratch and tell my users (not professional ones hopefully) they will need to use their backups for fresh accounts.