Backend: Move from Pages API Routes to App Router Handlers (or Server Actions)

[akrolsmir]

We did a lot of our server-side code using Pages API Routes (https://nextjs.org/docs/pages/building-your-application/routing/api-routes). A year later, NextJS has rolled out 2 different ways of doing this for App Router:

• Route handlers: https://nextjs.org/docs/app/building-your-application/routing/route-handlers
• Server actions: https://nextjs.org/docs/app/building-your-application/data-fetching/server-actions-and-mutations

It might be worth migrating these over? The old way is vaguely less elegant/supported, plus it seems to have caused an issue where the admin client was required in one place, instead of the server client: b7e7fe6