So this is the new generation of Javascript self-hostable wikis inspired by Notion. I remember in the late 2000s, most were PHP-based, with Twiki being an exception: it was Perl-based and also had a powerful wiki/database combination [1]. But it was not intuitive to use. That's what Notion nailed a decade later.
Now All the new (OSS ?) Notion clones like Outline are still deficient in that second database aspect. I hope we are eventually getting there.