Auto-post expenses and invoice payments to accounts ledger

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/server/accounts/ledger.ts

@@ -259,7 +259,8 @@ export async function postInvoicePaymentTransaction(
 			total: invoices.total,
 			currency: invoices.currency,
 			issueDate: invoices.issueDate,
-			invoiceNumber: invoices.invoiceNumber
+			invoiceNumber: invoices.invoiceNumber,
+			direction: invoices.direction
 		})
 		.from(invoices)
 		.where(eq(invoices.id, invoiceId))
@@ -273,6 +274,11 @@ export async function postInvoicePaymentTransaction(
 		.limit(1);
 	if (!acct) throw new Error(`postInvoicePaymentTransaction: account ${paymentAccountId} not found`);
 
+	// outgoing = we billed a customer → cash in (credit).
+	// incoming = we owe a supplier → cash out (debit).
+	const sign = inv.direction === 'outgoing' ? 1 : -1;
+	const signedAmount = sign * Number(inv.total);
+
 	await dbOrTx
 		.delete(companyAccountTransactions)
 		.where(eq(companyAccountTransactions.sourceInvoiceId, invoiceId));
@@ -281,7 +287,7 @@ export async function postInvoicePaymentTransaction(
 		accountId: paymentAccountId,
 		companyId: acct.companyId,
 		type: 'invoice_payment',
-		amount: Number(inv.total).toFixed(2),
+		amount: signedAmount.toFixed(2),
 		currency: inv.currency,
 		occurredAt: new Date(inv.issueDate),
 		description: `Invoice ${inv.invoiceNumber}`,