fix: retry transient RSS fetch failures with backoff

Co-authored-by: Cursor <cursoragent@cursor.com>

daily/news/fetch.py

@@ -289,17 +289,22 @@ def _fetch_one(
     category: NewsCategory,
     feed: NewsFeed,
 ) -> tuple[list[dict[str, Any]], bool]:
+    max_attempts = max(1, env_int("DAILY_RSS_RETRY", 3))
     last_exc: Exception | None = None
     for url in _reddit_fetch_urls(feed.url):
-        try:
-            headers = _request_headers(dict(client.headers), url)
-            resp = client.get(url, headers=headers)
-            resp.raise_for_status()
-            entries = _parse_feed(resp.text, feed.name, category)
-            return _filter_ai_entries(entries, ai_filter=feed.ai_filter), True
-        except Exception as exc:
-            last_exc = exc
-            continue
+        for attempt in range(max_attempts):
+            try:
+                headers = _request_headers(dict(client.headers), url)
+                resp = client.get(url, headers=headers)
+                resp.raise_for_status()
+                entries = _parse_feed(resp.text, feed.name, category)
+                return _filter_ai_entries(entries, ai_filter=feed.ai_filter), True
+            except Exception as exc:
+                last_exc = exc
+                if attempt + 1 < max_attempts:
+                    time.sleep(min(2.0 * (attempt + 1), 5.0))
+                    continue
+                break
     logger.warning("RSS fetch failed [%s] %s: %s", feed.name, feed.url, last_exc)
     return [], False