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BigInt (64bit) identifiers
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Nextcloud uses big integers to store identifiers and auto-increment keys in the database.
Because changing columns on huge tables can take quite a while (up to hours or days) 
depending on the number of files in the Nextcloud instance, this migration on the filecache 
and activity table has to be triggered manually by a console command.

The command can safely be executed. It will show a success message when there is nothing to do::

    sudo -u www-data php occ db:convert-filecache-bigint
    All tables already up to date!

or otherwise ask for confirmation, before performing the heavy actions::

    sudo -u www-data php occ db:convert-filecache-bigint
    This can take up to hours, depending on the number of files in your instance!
    Continue with the conversion (y/n)? [n]

to suppress the confirmation message append ``--no-interaction`` to the argument list::

    sudo -u www-data php occ db:convert-filecache-bigint --no-interaction


.. note:: Similar to a normal update, you should shutdown your Apache or nginx server or enable maintenance
          mode before running the command to avoid issues with your sync clients.