env-var-naming-drift-compose-vs-app-code
docker-compose.prod.yml and k8s manifests used DATABASE_URL, REDIS_URL, SMTP_* (12-factor style) while the app reads RDASH_-prefixed names via pydantic Settings. App would boot with all dev defaults silently. Always grep the app’s Settings class for its exact env var names before wiring compose/k8s env sections.