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

Fuchs_Database/Scripts/2026-09-16_fis_widgets_set_based_payment_amounts.sql

@@ -0,0 +1,31 @@
+-- =============================================
+-- One-off data migration (fis_widgets rows are data, not schema — run once per environment
+-- after deploying the schema that adds [dbo].[fds__fn_InvoicePaymentAmounts] and the
+-- [PaymentAmount]/[OpenAmount] columns of [dbo].[fds__fn_unpaidInvoices]).
+--
+-- Both widgets called the scalar [fds__fn_InvoicePaymentAmount](Id) once per invoice row. That
+-- function declares a table variable, so SQL Server cannot inline it and re-runs the whole
+-- banking TVF per row (~0.5 s each): wdg_invoices_overdue_sum took ~100 s over 187 unpaid
+-- invoices and timed out the 90 s widget command; wdg_unbez_akonto took ~5 s (hidden by daycache).
+-- Set-based replacements give identical totals in < 0.5 s.
+-- Idempotent: each UPDATE only rewrites the old text and is a no-op once applied.
+-- =============================================
+SET NOCOUNT ON;
+
+UPDATE [dbo].[fis_widgets]
+   SET [sql] = REPLACE([sql], N'[invoicebalance] - [dbo].[fds__fn_InvoicePaymentAmount](Id)', N'[OpenAmount]')
+ WHERE [short_name] = 'wdg_invoices_overdue_sum'
+   AND [sql] LIKE N'%[[]dbo].[[]fds__fn_InvoicePaymentAmount](Id)%';
+PRINT CONCAT('wdg_invoices_overdue_sum rows updated: ', @@ROWCOUNT);
+
+UPDATE [dbo].[fis_widgets]
+   SET [sql] = REPLACE(REPLACE([sql]
+                 , N'[dbo].[fds__fn_InvoicePaymentAmount]([id])', N'ISNULL(pay.[Amount], 0.0)')
+                 , N'FROM [dbo].[fds__invoices] as i where', N'FROM [dbo].[fds__invoices] as i LEFT JOIN [dbo].[fds__fn_InvoicePaymentAmounts]() as pay ON pay.[InvId] = i.[id] where')
+ WHERE [short_name] = 'wdg_unbez_akonto'
+   AND [sql] LIKE N'%[[]dbo].[[]fds__fn_InvoicePaymentAmount]([[]id])%'
+   AND [sql] LIKE N'%FROM [[]dbo].[[]fds__invoices] as i where%';
+PRINT CONCAT('wdg_unbez_akonto rows updated: ', @@ROWCOUNT);
+
+-- Verify: nothing on the dashboard still calls the per-row scalar function.
+SELECT [short_name], [sql] FROM [dbo].[fis_widgets] WHERE [sql] LIKE N'%fds__fn_InvoicePaymentAmount](%';