"""matrix-synapse — BACKUP overlay (Phase 1e HC3): assertion-only + additive.

ops.pre_backup wrote "original" into postgres before the backup op (pg_backup.sh dumps the DB); the
orchestrator performed the backup once (generic tier asserted a snapshot artifact). This overlay
ADDS: the seeded row is intact at backup time. The backup→restore divergence (dropping the table) is
in ops.pre_restore."""

import os
import sys

sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "runner"))
from harness import lifecycle  # noqa: E402


def _psql(domain, sql):
    cmd = f'PGPASSWORD=$(cat /run/secrets/db_password) psql -U synapse -d synapse -tAc "{sql}"'
    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()


def test_backup_captures_state(live_app):
    assert (
        _psql(live_app, "SELECT v FROM ci_marker;") == "original"
    ), "the seeded postgres state was not present at backup time"