second version

db/routines/R__fn_fill_forecast_accuracy.sql

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+CREATE OR REPLACE FUNCTION ems.fn_fill_forecast_accuracy(
+    p_site_id INT,
+    p_lookback_hours INT DEFAULT 48
+)
+RETURNS INT
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    v_count INT := 0;
+BEGIN
+    INSERT INTO ems.forecast_accuracy (
+        site_id, pv_array_id, interval_start, run_id,
+        forecast_power_w, forecast_created_at, lead_time_hours,
+        actual_power_w, actual_filled_at,
+        error_w, error_pct
+    )
+    SELECT
+        fpr.site_id,
+        fpr.pv_array_id,
+        fpi.interval_start,
+        fpi.run_id,
+        fpi.power_w                                          AS forecast_power_w,
+        fpr.created_at                                       AS forecast_created_at,
+        ROUND(
+            EXTRACT(EPOCH FROM (fpi.interval_start - fpr.created_at))
+            / 3600.0, 2
+        )                                                    AS lead_time_hours,
+        slot.avg_actual_w::INT                               AS actual_power_w,
+        now()                                                AS actual_filled_at,
+        fpi.power_w - COALESCE(slot.avg_actual_w::INT, 0)    AS error_w,
+        CASE
+            WHEN slot.avg_actual_w IS NOT NULL
+                 AND slot.avg_actual_w > 0
+            THEN ROUND(
+                (fpi.power_w::NUMERIC - slot.avg_actual_w::NUMERIC)
+                / slot.avg_actual_w::NUMERIC * 100,
+                4
+            )
+            ELSE NULL
+        END                                                  AS error_pct
+    FROM ems.forecast_pv_interval fpi
+    JOIN ems.forecast_pv_run fpr ON fpr.id = fpi.run_id
+    JOIN ems.asset_pv_array pa   ON pa.id  = fpr.pv_array_id
+    LEFT JOIN LATERAL (
+        SELECT AVG(
+            CASE
+                WHEN pa.controllable = false THEN ti.gen_port_power_w::NUMERIC
+                ELSE (COALESCE(ti.pv1_power_w, 0) + COALESCE(ti.pv2_power_w, 0))::NUMERIC
+            END
+        ) AS avg_actual_w
+        FROM ems.telemetry_inverter ti
+        WHERE ti.site_id = fpr.site_id
+          AND ti.measured_at >= fpi.interval_start
+          AND ti.measured_at < fpi.interval_start + INTERVAL '15 minutes'
+    ) slot ON true
+    WHERE fpr.site_id = p_site_id
+      AND fpr.status  = 'ok'
+      AND fpi.interval_start < now() - INTERVAL '15 minutes'
+      AND fpi.interval_start >= now() - make_interval(hours => p_lookback_hours)
+    ON CONFLICT (run_id, interval_start) DO UPDATE SET
+        actual_power_w   = EXCLUDED.actual_power_w,
+        actual_filled_at = EXCLUDED.actual_filled_at,
+        error_w          = EXCLUDED.error_w,
+        error_pct        = EXCLUDED.error_pct;
+
+    GET DIAGNOSTICS v_count = ROW_COUNT;
+    RETURN v_count;
+END;
+$$;
+
+COMMENT ON FUNCTION ems.fn_fill_forecast_accuracy(INT, INT) IS
+'Doplní skutečné hodnoty výroby do forecast_accuracy z telemetrie.
+Volat každých 15 minut (spolu s audit_filler) pro inkrementální plnění.
+p_lookback_hours: kolik hodin zpět zpracovat (default 48h pro catch-up).
+Pro první backfill: SELECT ems.fn_fill_forecast_accuracy(2, 8760) -- 1 rok';