Add back missing pubdate check

packages/rss-handler/src/index.ts

@@ -242,6 +242,15 @@ export const rssHandler = Sentry.GCPFunction.wrapHttpFunction(
       const feed = await parser.parseString(fetchResult.content)
       console.log('Fetched feed', feed.title, new Date())
 
+      const feedPubDate = (feed['dc:date'] ||
+        feed.pubDate ||
+        feed.lastBuildDate) as string | undefined
+      console.log('Feed pub date', feedPubDate)
+      if (feedPubDate && new Date(feedPubDate) < new Date(lastFetchedAt)) {
+        console.log('Skipping old feed', feedPubDate)
+        return res.send('ok')
+      }
+
       // save each item in the feed
       for (const item of feed.items) {
         // use published or updated if isoDate is not available for atom feeds