feat: persist messages separately and update ingress docs

deployments/k8s/ingress.yaml

@@ -1,6 +1,6 @@
 # deployments/k8s/ingress.yaml
 # Ingress для shared-sqs на домене qu.kube5s.ru
-# Created: 2026-04-09, Updated: 2026-04-10
+# Created: 2026-04-09, Updated: 2026-04-11
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
@@ -11,6 +11,13 @@ metadata:
     nginx.ingress.kubernetes.io/proxy-body-size: 10m
     nginx.ingress.kubernetes.io/proxy-read-timeout: "30"
     nginx.ingress.kubernetes.io/proxy-send-timeout: "30"
+    # Fix: 64KB+ payload (boto3/urllib3 2.0 шлёт headers и body отдельными TCP write,
+    # botocore убирает TCP_NODELAY → последние ~16KB body не доходят за client_body_timeout).
+    # Решение: proxy-request-buffering=off стримит body напрямую в backend без ожидания полного тела.
+    nginx.ingress.kubernetes.io/client-body-buffer-size: "512k"
+    nginx.ingress.kubernetes.io/proxy-request-buffering: "off"
+    nginx.ingress.kubernetes.io/server-snippet: |
+      client_body_timeout 120s;
 spec:
   ingressClassName: nginx
   rules: