Retry Resend calls on 429 and throttle Newsletter Archive lookups; v2.7.1

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/routes/newsletter.js

@@ -4,6 +4,7 @@ import { requireAdminAuth } from '../auth.js'
 import { state } from '../state.js'
 import { queueNewsletterIssuesWrite } from '../data.js'
 import { escapeHtml } from '../helpers.js'
+import { resendRetry } from '../email.js'
 
 const BASE = 'https://versebyversewithnate.us'
 const NEW_EPISODE_TOPIC_NAME = 'new episode'
@@ -117,8 +118,8 @@ export function register(app) {
     try {
       const resend = new Resend(process.env.RESEND_API_KEY)
       const [{ data: topicsData, error: topicsError }, { data: listData, error: listError }] = await Promise.all([
-        resend.topics.list(),
-        resend.broadcasts.list(),
+        resendRetry(() => resend.topics.list()),
+        resendRetry(() => resend.broadcasts.list()),
       ])
       if (topicsError) throw new Error(topicsError.message)
       if (listError) throw new Error(listError.message)
@@ -126,7 +127,12 @@ export function register(app) {
       const newEpisodeTopic = (topicsData?.data ?? []).find(t => String(t.name || '').trim().toLowerCase() === NEW_EPISODE_TOPIC_NAME)
       const sentBroadcasts = (listData?.data ?? []).filter(b => b.status === 'sent')
 
-      const details = await Promise.all(sentBroadcasts.map(b => resend.broadcasts.get(b.id)))
+      // Fetch a few at a time so a long broadcast history can't exceed Resend's requests-per-second limit.
+      const details = []
+      for (let i = 0; i < sentBroadcasts.length; i += 4) {
+        const chunk = await Promise.all(sentBroadcasts.slice(i, i + 4).map(b => resendRetry(() => resend.broadcasts.get(b.id))))
+        details.push(...chunk)
+      }
 
       const broadcasts = details.map(({ data }, i) => {
         const summary = sentBroadcasts[i]