Clean up after yourself

You really need to clean up after your plugin uninstalls. I had tried it out awhile ago (uninstalled) and upon trying it again now I see many (all?) of the settings are still there. General practice is to delete everything you created on uninstall.

I saw you mention a “reset” button in another thread, but I don’t see that anywhere. So I manually had to go through your code and find all the tables and options you created and delete them one by one.

https://wordpress.org/plugins/weekly-schedule/