Sound like they are using 32 bits keys and reached the limits of 4 billion items. Had the same thing happen in my company earlier this year in our homemade cha

Sound like they are using 32 bits keys and reached the limits of 4 billion items. Had the same thing happen in my company earlier this year in our homemade chat system. Why didn't they get alerts? Because the alert was probably counting existing items in the table, not deleted elements that did increase the auto increment.