Repair database wrt indexes / unique constraints
* recreate indexes dropped by 3.23 migration (but it's still unclear why)
* attempt drop remaining extra indexes (there may be a bunch of these on old instances)
* warn about missing expected indexes
Closes #16666137
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')