Lukáš Karas authored Mar 11, 2016 and Daniel Vrátil committed Mar 11, 2016

Commit 54e1f097 introduced automatic recovery of missing foreign keys during
startup (this has been accompanied by DB schema upgrade to revision 31). If
they FKs were previously missing MySQL will fail to create the keys and Akonadi
startup will fail.

To make sure there are no inconsistencies in DB we manually delete all orphaned
relations before proceeding with the DB check.

BUG: 354536
FIXED-IN: 15.12.3