That information sppears to be stored in the schedule.pickle file on Windows. However it is not a text file so not easily editable - but perhpas you can simply delete the file if you have nothing to be scheduled?
On windows this file is located under your application profile in the Application Data\calibre folder. Note that as the "Application Data" folder is normally set to be hidden make sure you can see hidden files if trying to navigate to it. On other systems I am not sure where it will be located.
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