- pg_backup.sh: use the db service's POSTGRES_USER (default postgres) for the dump/drop/recreate instead of detecting the superuser at runtime, since the recipe now sets that env var; one-line the constants comment - release note: explain the in-place pg_upgrade + the POSTGRES_USER override - bump PG_BACKUP_VERSION v4 Verified on cctest: backup + restore via the hooks round-trips with POSTGRES_USER.