If I look at the table, I still see the custom menu and custom pages rows. There's no way to fix it, rather than running that script? And I don't know what to do to run that script. Can you explain step by step what I should do? Can I use Navicat? I've attached an image of the table so you can see the columns.
What I deleted was just the content area where you can type in whatever content you want, not the whole top row navigation. And as I said, the buttons are still there on the site too.