Function pg_dump_invocation 

pub fn pg_dump_invocation(conn: &PgConnection, data_only: bool) -> SqlInvocation

Build the pg_dump invocation for an EXPORT. Custom format (-Fc): compressed and the natural input to pg_restore. --data-only emits only the data AND EXCLUDES the host-owned migration ledger’s rows (boatramp_migrations.*): the ledger is a schema INSIDE the tenant database, so a plain --data-only dump would carry its rows and a pg_restore --data-only --exit-on-error into the already-migrated target (the matching-fingerprint case — the PRIMARY use) would hit a primary-key conflict on the ledger and abort. Excluding it keeps the target’s own boatramp_migrations ledger intact (the stated property).