Refactor article fetching

* Apply different limits to profile and feed
* Ensure the limit is the returned amount
* Pre-sort articles

nostr.ts

@@ -2,6 +2,7 @@ import { NostrEvent, NostrFilter, NPool, NRelay1 } from "@nostrify/nostrify";
 import { nip19 } from "@nostr/tools";
 import { lookupUsernameByPubkey } from "./directory.ts";
 import config from "./config.ts";
+import Article from "./models/article.ts";
 
 const relayPool = new NPool({
   open: (url) => new NRelay1(url),
@@ -49,14 +50,20 @@ export async function fetchReplaceableEvent(
   }
 }
 
-export async function fetchArticlesByAuthor(pubkey: string) {
+export async function fetchArticlesByAuthor(
+  pubkey: string,
+  limit: number = 10,
+) {
   const events = await fetchWithTimeout([{
     authors: [pubkey],
     kinds: [30023],
-    limit: 210,
+    limit: limit,
   }]) as NostrEvent[];
 
-  return events;
+  const articles = events.map((a) => new Article(a));
+  const sortedArticles = articles.sort((a, b) => b.publishedAt - a.publishedAt);
+  // The limit seems to apply per relay, not per pool query
+  return sortedArticles.slice(0, limit);
 }
 
 export async function fetchProfileEvent(pubkey: string) {