During the upgrade to Moodle version 2.6 from 2.5.3 I received a ddl sql execution error.
I restored from backup and reduced the loglifetime cleanup variable down to 180 days as suggested by Eloy Lafuente in https://moodle.org/mod/forum/discuss.php?d=167997
However when I tried again after the fix the same error repeated.
The error output is shown below

Using LAMP system.