pg_dump rejects `--single-transaction` — it's a pg_restore / psql flag,
never a pg_dump one. Triggered as soon as the inline-dump path landed
on Ralf's install:
pg_dump: unrecognized option: single-transaction
pg_dump: hint: Try "pg_dump --help" for more information.
pg_dump already wraps the entire export in a single REPEATABLE READ
snapshot automatically (since Postgres 9.x), so the original intent —
consistent snapshot of the live DB — is preserved by removing the
flag. Same "latent until Stage A wired it in" pattern as the three
prior bugs this rollout has surfaced (PG insert destructure → bind-
mount EACCES → Node 22 stdio strict mode → this).
Luca
0ad14899fa