Redirects deleted too early

Updated patch #67 to the latest code and added a check if the created column does not exists yet before adding it

Tried patch #73. It seemed to have fixed the problem at first. It passed multiple tests on different environments including prod, but then it happened again.

In my redirect settings, I have it to Delete redirects that have not been accessed for 1 yr and delete a max of 10 redirects per cron run.

The patch was applied, cleared cache, updated the db, which applied the db updates (Redirect 7105 Adds the {redirect}.created field.).

When I ran cron manually via drush, the redirects with count = 0 stayed.

When the cron ran automatically as scheduled, the redirects with count = 0 are gone again.

We always roll patches against dev. to make sure it safely can be applied and works with the latest changes.

I applied the patch in #73 on 7.x-1.x-dev some days ago and the issue seems to be solved, thanks!