progressively working deploy scenario

docker-compose.prod.yml

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+# Production override — use with: docker compose -f docker-compose.yml -f docker-compose.prod.yml up
+# Assumes: managed PostgreSQL, external reverse proxy / load balancer handling TLS and port 80/443.
+
+services:
+  # No db service — managed PostgreSQL is assumed.
+  # Set KMTN_DATABASE_URL in your environment or a .env file.
+
+  api:
+    environment:
+      KMTN_ENV: production
+      # Override with your actual production domain(s)
+      KMTN_CORS_ORIGINS: '["https://yourdomain.com"]'
+    # No port mapping — traffic arrives via reverse proxy / load balancer
+
+  frontend:
+    environment:
+      # Point to your API's production URL
+      API_UPSTREAM: https://api.yourdomain.com
+    # No port mapping — traffic arrives via reverse proxy / load balancer