Postgres-first cutover step. Already-initialized PG17 ignores POSTGRES_PASSWORD on restart (role pw in pg_authid), so this byte-identical roll is benign. StatefulSet RollingUpdate is ordered terminate-then-create (no two-postmaster surge), so no Recreate flip. Applied via kubectl (not ArgoCD-managed). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>