samen-clinic/src/app/blog/[id]/page.tsx

import { notFound, redirect } from "next/navigation";

import { blogHref, fetchBlogBySlug, getLocalBlogPost } from "@/lib/blog";

export const revalidate = 60;

/** Legacy `/blog/{slug-or-id}` → canonical `/blog/{id}/{titleSlug}`. */
export default async function LegacyBlogRedirect({
  params,
}: {
  params: Promise<{ id: string }>;
}) {
  const { id } = await params;

  const apiPost = await fetchBlogBySlug(id);
  if (apiPost) redirect(blogHref(apiPost));

  const local = getLocalBlogPost(id);
  if (local) redirect(blogHref(local));

  notFound();
}