Docs say ISR is for after you've built your site. So that leaves me with a couple questions:

1. If I have 10K, 100k, 1M dynamic route pages([slug]/[page]) is there a way to batch generate? Since trying to load in an enormous dataset all at once isn't really viable.
2. If I add an additional dynamic route in my CMS can I generate a static page just for that route without regenerating the entire site again? How would I do that?