It seems this fixes it. But two steps are required. Firstly, i had to enable ldap again in the database via
update owncloud.oc_appconfig set configvalue ='yes' where appid='user_ldap' and configkey='enabled' limit 1;
At this point, the owncloud install will want to 'upgrade' again in the web interface (even if it was previously upgraded). It will fail.
Secondly, as i am running via wheezy-backports i had to manually install php-doctrine-dbal_2.4.2-4_all.deb (download it and dpkg -i)
The 'upgrade' via the web interface then succeed to update the schema. Hopefully the backport will be updated? -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org