I am using OMP 3.1.2-1. I tried to change Cover Thumbnails (Settings-Webside-Appearance) with changing the width and height for the thumbnails and selecting the option Resize all existing cover thumbnails. I get back error 500. I am assuming this is due to a large number of monographs (~1000) and a timeout. Can anyone help me to get a CLI php command that executes this thumbnails transformation? Or help me with further instructions how to solve the problem?