The column should be named info_requests_overdue_count

... not info_requests_overdue.
Fix the migration that adds statistics columns
Add a test for the PublicBodyController statistics action
Improve calculation of PublicBody statistics columns

On PublicBody, we don't need to update info_requests_count
because that's already done with :counter_cache.  On the
other hand, info_requests_successful_count and
info_requests_not_held_count can't be updated easily with
counter_cache (since they need conditions to be attached).
Instead we update them in post_save and post_destroy,
as suggested here:

   http://blog.douglasfshearer.com/post/17495285851/custom-counter-cache-with-conditions
Correct a small typo