Problems with oc_authtoken updating to NC28

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Nextcloud version (eg, 20.0.5): 27.1.5
Operating system and version (eg, Ubuntu 20.04): Synology 7.2
Apache or nginx version (eg, Apache 2.4.25): apache
PHP version (eg, 7.4): PHP 8.0
The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. while updating with the command ./occ update

The output of your Nextcloud log in Admin > Logging:
Updating database schema
Exception: Database error when running migration 28000Date20230906104802 for app core
Index name “authtoken_uid_index” for table “oc_authtoken_bck” collides with the constraint on table “oc_authtoken”.
Update failed

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

Did you fidle around with your tables and once created a backup of your “oc_authtoken” table?
The table “oc_authtoken_bck” does normaly not exist, only if you created it once for an administration task.

You can solve that with:

  1. Create a database dump

  2. Open your sql console and drop the backup table:

    DROP TABLE nextcloud.oc_authtoken_bck;
  3. Restart update

I hope that solves your issue!
Much luck,

Thank you. I dropped the index and I could finish the update successfully. I will follow your suggestion and drop the table, that I probably create many years ago

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