fix: handle MaxMind 429 and backoff

asn-updater/update.py

@@ -29,6 +29,12 @@ def download_maxmind_mmdb() -> None:
     with tempfile.TemporaryDirectory() as td:
         tgz = os.path.join(td, "GeoLite2-ASN.tar.gz")
         r = requests.get(url, timeout=TIMEOUT)
+        if r.status_code == 429:
+            existing = os.path.join(OUT_DIR, "GeoLite2-ASN.mmdb")
+            if os.path.exists(existing):
+                print("[warn] MaxMind rate limited (429); keeping existing mmdb")
+                return
+            raise RuntimeError("MaxMind rate limited (429) and no existing mmdb")
         r.raise_for_status()
         with open(tgz, "wb") as f:
             f.write(r.content)