Default ingress to Traefik; nginx annotations as documented opt-in

README.md

@@ -120,9 +120,11 @@ For production prefer a values file, or create the Secret yourself and set
 
 Notes:
 
-- The default ingress annotations disable nginx's request body limit and
-  request buffering so multi-GB RAW uploads stream through. Adapt for other
-  ingress controllers.
+- The chart defaults to Traefik, which needs no special config (no body-size
+  limit, streaming by default). For ingress-nginx, set `ingress.className:
+  nginx` and the commented `proxy-body-size`/`proxy-request-buffering`
+  annotations in values.yaml — nginx's 1MiB default otherwise rejects RAW
+  uploads.
 - Migrations run automatically on startup of either binary (they take a
   Postgres advisory lock, so concurrent starts are safe).
 - Scale `worker.replicas` (or `worker.concurrency`) if imports queue up;