Nextcloudpi -> howto reuse old database?

[byu]

hi there,
while upgrading my #odroid #hc2 to #bullseye I totally destroyed my #nextcloudpi setup an spent some horrible days trying to bring it back again… without success

I ended up reinstalling the last build for my board and “reinserting” my old data directory an got my data back.
Unfortunately, I am still missing my (shared) calendars and contacts an don’t know how to “reconnect” my old database, which resides in

/media/hdd/nextcloud-database/

Any suggestions, how to reuse my old database as a database-noob?

PS: I already tried Bernies script [https://codeberg.org/BernieO/calcardbackup](https://codeberg.org/BernieO/calcardbackup) with a nextcloud_dummy on my local machine, without success:

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• Wed 14 Dec 2022 08:29:46 PM CET → START calcardbackup ver. 5.0.0 (06.11.2022), AGPL-3.0
• Checking dependencies and preparing…
• no usersfile given:

• - will fetch all available items from database
  

• Using URL: https://nextcloud-hc2
• can’t read status.php (cURL code ‘6’).
• Nextcloud 21.0.4 detected.
• Database of chosen Nextcloud installation is MySQL/MariaDB.
• Looking for calendars in your Nextcloud:
  ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/run/mysqld/mysqld.sock’ (2)
  – calcardbackup: ERROR –
  – Database connection could not be established!
  – removing temporary files…
  – calcardbackup: Exiting.