Is the

per_page

limit of 250 an arbitrary limit that could be easily increased by raising a constant in the typesense code or are there architectural limitations in the code that would make this tricky to increase?

You can increase it in code but it's going to make searching slower. 250 is a sweet spot. The reason it's a constant is for some compiler optimisations that can be done when it's a constant.

Got it, thanks!