feat(bot): implement filtering on published threshold param

src/bot/task.ts

@@ -51,6 +51,12 @@ const processItems = async (items: RssParser.Item[], feed: ExpandedFeed, channel
     console.log(`Processing ${items.length} items`);
 
     for (let i = items.length; i--;) {
+        if (new Date(items[i].pubDate!) < feed.published_threshold) {
+            console.log(`skipping outdated item: ${items[i].title}`)
+            items.splice(i, 1);
+            continue;
+        }
+
         if (!(await Promise.all(feed.filters.map(f => passesFilter(f, items[i])))).every(Boolean)) {
             items.splice(i, 1);
         }