feat: implement set-based invoice payment calculations and enhance email logging configuration

Fuchs_Database/dbo/Functions/fds__fn_InvoicePaymentAmounts.sql

@@ -0,0 +1,23 @@
+-- =============================================
+-- Description:	Set-based counterpart of the scalar [fds__fn_InvoicePaymentAmount]:
+--              returns the summed (non-storno) banking payments for EVERY invoice in one pass
+--              over [fds__fn_bankingtransactions]. Join it instead of calling the scalar
+--              function per row — the scalar one declares a table variable, so SQL Server
+--              cannot inline it and re-runs the whole banking TVF for each invoice
+--              (~0.5 s × N rows; the overdue-sum widget timed out at 90 s with 187 rows).
+--              Same semantics as the scalar version with an empty id list: all invoices,
+--              no date filter, storno credits NOT included (see *_full for those).
+-- =============================================
+CREATE FUNCTION [dbo].[fds__fn_InvoicePaymentAmounts]
+(
+)
+RETURNS TABLE
+AS
+RETURN
+(
+	SELECT [InvId]  = bs.[InvId]
+		  ,[Amount] = CAST(SUM(ISNULL(bs.[Amount], 0.0)) as numeric(9,2))
+	FROM [dbo].[fds__fn_bankingtransactions](NULL, NULL, NULL, NULL, DEFAULT) as bs
+	WHERE bs.[InvId] IS NOT NULL
+	GROUP BY bs.[InvId]
+)