Did Something Stupid, tried to upgrade, lost Contacts and Calendar. Need help

[bpcurse]

Could the solution shown here be of any help to you? I know it’s MariaDB, but they are quite similar.

[SOLVED] Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes

ERROR MESSAGE: An exception occurred while executing ‘ALTER TABLE [TABLE_NAME] CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_bin;’: SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes SOLUTION: $ sudo mysql -u root -p MariaDB [(none)]> use nextcloud; MariaDB [nextcloud]> set global innodb_large_prefix=on; MariaDB [nextcloud]> set global innodb_file_format=Barracuda; $ sudo -u www-data php occ maintenance:repair

And some reference from the mysql 5.6 docs:
https://dev.mysql.com/doc/refman/5.6/en/innodb-limits.html