"""matrix-synapse — UPGRADE overlay (Phase 1e HC3): data-continuity, assertion-only + additive.

ops.pre_upgrade wrote a postgres marker row before the upgrade; the orchestrator performed the
upgrade once (generic tier asserted reconverge/serving/moved). This overlay ADDS: the postgres data
survived. Read via psql in the `db` service."""

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_upgrade_preserves_data(live_app):
    assert _psql(live_app, "SELECT v FROM ci_marker;") == "upgrade-survives", (
        "postgres data did not survive the upgrade"
    )
