-- ============================================================
-- 15min continuous aggregate telemetrie střídače (dashboard sloty)
-- ============================================================
-- Zarovnáno s 15min sloty UI (UTC time_bucket = floorSlotUtcMs v frontendu).
-- Hodinový CA telemetry_inverter_hourly zůstává pro dlouhé grafy / legacy.

CREATE MATERIALIZED VIEW IF NOT EXISTS ems.telemetry_inverter_15m
WITH (timescaledb.continuous) AS
SELECT
    time_bucket('15 minutes', measured_at) AS slot_start,
    site_id,
    AVG(pv_power_w)::INT                  AS avg_pv_w,
    AVG(battery_power_w)::INT             AS avg_battery_w,
    AVG(grid_power_w)::INT                AS avg_grid_w,
    AVG(load_power_w)::INT                AS avg_load_w,
    LAST(battery_soc_percent, measured_at) AS last_soc_pct,
    COUNT(*)                               AS sample_count
FROM ems.telemetry_inverter
GROUP BY slot_start, site_id
WITH NO DATA;

-- Refresh: ≥2× time_bucket (15 min) → start_offset > 30 min
SELECT add_continuous_aggregate_policy(
    'ems.telemetry_inverter_15m',
    start_offset       => INTERVAL '45 minutes',
    end_offset         => INTERVAL '1 minute',
    schedule_interval  => INTERVAL '15 minutes'
);

COMMENT ON MATERIALIZED VIEW ems.telemetry_inverter_15m IS
'Čtvrthodinové agregáty telemetrie střídače. TimescaleDB continuous aggregate.
Refresh každých 15 minut. Dashboard přehled (sloty 15 min).
View vw_telemetry_15m_7d je v repeatable R__vw_telemetry_15m_7d.sql.';