I’ve got a custom module on a D6 client site that contains a few rules actions and conditions that another dev created. There are about 10 detailed rules set up on the system relying on these actions & conditions. We needed to rename the module (its actually a feature module) for consistency and better organization.
A server hardware failure and crash leave a Drupal 6 site “locked up”… and not even the admin can log in! Using mostly Drush, I was able to diagnose the issue and fix it from the command line.