I've signed one once that had a clause where everything I made for a year after the job ended I had to approach them with it and give them a chance to offer me money for it (right of first refusal), but never anything where they automatically own it post employment.

They did have a 'we own pretty much every thought you have while you work here' clause, though, because it was a game studio and the owner's reasoning was you could have inspiration for game ideas for what you're working on pretty much anytime, anywhere...which he's right about, and he was a cool guy and I don't think he'd enforce the clause to actually steal other people's outside projects, but that clause still made me uneasy and I didn't really pursue my personal projects while I worked there much as a result.

But what you received is much, much worse.