Increase the freshness threshold for popular feeds

boards/models.py

@@ -180,7 +180,7 @@ class Article(models.Model):
             return self.created_at > now - timedelta(days=1)
         elif frequency >= 100:
             # extra high frequency — mark newest posts
-            return self.created_at > now - timedelta(hours=2)
+            return self.created_at > now - timedelta(hours=3)
 
         # normal frequency - mark 6-hour old posts
         return self.created_at > now - timedelta(hours=6)