"""discourse — BACKUP overlay (Phase 1e HC3 / Phase 2 P4): assertion-only + additive.

ops.pre_backup seeded ci_marker='original' into the discourse postgres DB (which the recipe's
backupbot pre-hook pg_dumps). 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 = (
        'PGPASSWORD=$(cat /run/secrets/db_password) '
        f'psql -U discourse -d discourse -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 discourse postgres state was not present at backup time"
    )