second version

db/migration/V013__predicted_negative_price_window.sql

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+-- Predikovaná okna záporných spotových cen (cache pro UI / API)
+
+CREATE TABLE ems.predicted_negative_price_window (
+    id                 SERIAL PRIMARY KEY,
+    site_id            INT NOT NULL REFERENCES ems.site (id),
+    predicted_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+    predicted_date     DATE NOT NULL,
+    window_start_hour  INT NOT NULL,
+    window_end_hour    INT NOT NULL,
+    probability_pct    INT NOT NULL,
+    expected_min_price NUMERIC(10, 4),
+    reason             TEXT,
+    UNIQUE (site_id, predicted_date, window_start_hour)
+);
+
+COMMENT ON TABLE ems.predicted_negative_price_window IS
+'Výstup ems.fn_predict_negative_price_windows – predikce intervalů s rizikem záporné nákupní ceny; obnovovat po importu cen a forecastu FVE.';
+
+CREATE INDEX idx_predicted_neg_price_site_date
+    ON ems.predicted_negative_price_window (site_id, predicted_date);