docs: add cedlab_Chart_UnderlyingOnly SP script

docs/sql/cedlab_Chart_UnderlyingOnly.sql

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+USE [FirstSolutionDB]
+GO
+
+-- ============================================================
+-- SP: cedlab_Chart_UnderlyingOnly
+-- Restituisce lo storico prezzi di UN SOLO sottostante, senza
+-- alcun contesto certificato (nessuno strike/barriera/trigger).
+-- Usata da UnderlyingChartDataService per il grafico standalone
+-- sottostante.
+--
+-- Output (Px_date ASC, TOP 350 più recenti):
+--   Nome     VARCHAR  -- "{Name} ({Ticker_bbg})", uguale su ogni riga
+--   Px_date  DATE
+--   Px       DECIMAL  -- Px_close o Px_closeadj in base ad AdjustedPrices
+-- ============================================================
+
+CREATE OR ALTER PROCEDURE [dbo].[cedlab_Chart_UnderlyingOnly]
+    @IDUnderlyings INT
+AS
+BEGIN
+    SET NOCOUNT ON;
+
+    DECLARE @AdjustedPrices BIT;
+    SELECT @AdjustedPrices = ISNULL(AdjustedPrices, 0)
+    FROM dbo.Underlyings
+    WHERE IDUnderlyings = @IDUnderlyings
+      AND deleted = 0
+      AND sospeso = 0;
+
+    IF @AdjustedPrices IS NULL RETURN; -- non trovato / cancellato / sospeso
+
+    ;WITH Ranked AS
+    (
+        SELECT
+            p.Px_date,
+            CASE WHEN @AdjustedPrices = 0 THEN p.Px_close ELSE p.Px_closeadj END AS Px,
+            ROW_NUMBER() OVER (ORDER BY p.Px_date DESC) AS rn
+        FROM dbo.Prices p
+        WHERE p.UnderlyingsID = @IDUnderlyings
+          AND (p.Px_low IS NOT NULL OR p.Px_high IS NOT NULL OR
+               p.Px_open IS NOT NULL OR p.Px_close IS NOT NULL)
+    )
+    SELECT
+        u.Name + ' (' + u.Ticker_bbg + ')' AS Nome,
+        r.Px_date,
+        r.Px
+    FROM Ranked r
+    CROSS JOIN (SELECT TOP 1 * FROM dbo.Underlyings WHERE IDUnderlyings = @IDUnderlyings) u
+    WHERE r.rn <= 350
+    ORDER BY r.Px_date ASC;
+END
+GO