SELECT
    ts,
    raw_drain_state,
    sample_valid,
    drain_state,
    control_state,
    semantic_state,
    battery_v
FROM mv_hot.drain_readings
WHERE tenant = 'tma4p1aego_lab'
  AND site = 'bench_gh01'
  AND product = 'climate'
  AND asset = 'drain-01'
ORDER BY ts DESC
LIMIT 20;