Add Fuchs_Database SSDT project (schema source of truth)

Adds the SQL Server Data Tools project for the fuchs_fds database — tables,
table types, functions and stored procedures that the backend calls (e.g.
fds__getInvoice, fds__merge_bankingtransactions, fds__tt__bankingtransactions,
fds__admin_getReportCatalog, fis_* auth). Build/model caches (bin, obj,
*.dbmdl, *.jfm, *.user) are git-ignored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Fuchs_Database/dbo/Stored Procedures/fis_widgets_getCache.sql

@@ -0,0 +1,35 @@
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE PROCEDURE [dbo].[fis_widgets_getCache]	
+	@account varchar(50)
+	,@short_name varchar(50)
+	,@login_guid varchar(36)
+AS
+BEGIN
+	SET NOCOUNT ON;
+	DECLARE @RET nvarchar(max);
+    DECLARE @IsCacheable bit, @Personalized bit;
+
+	SELECT @IsCacheable = [daycache], @personalized = [personalized] 
+		FROM [dbo].[fis_widgets] 
+		WHERE ([account] = @account OR [account] = '*') AND [short_name] = @short_name;
+
+	IF @IsCacheable = 1
+		BEGIN
+			DELETE FROM [dbo].[fis_widgets_cache] WHERE [date] <> CAST(GETUTCDATE() as date);
+
+			SELECT TOP(1)
+				@RET = [data]
+			  FROM [dbo].[fis_widgets_cache]
+			  WHERE [account] = @account 
+				AND [short_name] = @short_name
+				AND [date] = CAST(GETUTCDATE() as date)
+				AND ((@Personalized = 1 AND [person_guid] = @login_guid) OR (@Personalized = 0));
+		END
+	
+	SELECT @RET;
+
+END