I stupidly created a ton of websites with custom themes (not child themes, 100% custom) and named my theme folder "custom". Now they are starting to auto-update and get replaced with some theme from the repository that happens to use the same folder name.
I could disable the updates in wp_config, but I don't really like that idea. Isn't there something I can do just in my theme files, to tell WordPress "this is a totally custom theme, not on your repository, don't try to update it"? This info must be around, but I just can't find it. I tried setting a name in my style.css file, but that didn't help, WordPress is still saying "update available" (and will overwrite my files if I click that option).
I usually just don't give my themes a name, my style.css file just starts out with my actual CSS.. and it seems to work fine, until this issue started.
If I rename the folder to something more obscure, that works... but then I'll have to recreate my menus, and not sure what else, because WP thinks I switched themes if I do that.
Maybe some tag I can add to style.css? Something like a "slug" or update URL?