feat: validate intentional post requests

src/features/posts/page.ts

@@ -0,0 +1,12 @@
+import type { Post, PostPage } from './types'
+
+export function flattenPostPages(pages: PostPage[]): Post[] {
+  const seen = new Set<string>()
+  return pages.flatMap(({ tweets }) =>
+    tweets.filter(({ id }) => {
+      if (seen.has(id)) return false
+      seen.add(id)
+      return true
+    }),
+  )
+}