A few months ago, a coworker migrated two WordPress sites from subdomains to subdirectories. They were both fine at first, but after a few weeks, one of the sites crashed. Upon investigation, it was discovered that all of the site's urls in MySQL had been reverted to the former subdomain. The reverted urls crashed the site.
The database was restored from a backup copy and the site is back online, but it will occasionally (~ once per month) attempt to revert all of the urls back to the subdomain. I assume there must be a reference to the former subdomain stored somewhere. We have searched both the database and the site files for vestigial references to the former subdomain, but have not been able to find a single reference. We haven't been able to sift anything useful out of the error logs yet. There must a script in WordPress or elsewhere that is triggering the event.
So far, my best guess is dark magic. What else might be causing this issue?
via Chebli Mohamed
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