This is caused by a race condition in the code, it’s safe to ignore (it shouldn’t be labeled as an error really, but that is part of WordPress that we can’t control). It happens when a new day starts and two visitors hit the site at nearly the same time for the first visit of […]
I see error messages in my PHP log like “WordPress database error Duplicate entry ‘YYYY-MM-DD’ for key ‘unique_date’ for …”
