Question about caching and SSR pages. Our assumption was that when we fetch data on any page, Next.j

Question about caching and SSR pages.
Our assumption was that when we fetch data on any page, Next.js's data caching would kick in.
However, with export const runtime = "edge", no cache is used at all.
I understand that SSR pages are... Server Side Rendered.
But our use case is that not everything needs to be fetched at request-time.
Specifically, the data we fetch from Firestore only needs to be fetched at build time, the data we do want to fetch on every request comes from Supabase.
How can we use the cache on an SSR page?
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