feat: détection doublons par numéro+montant dans les 3 points d'import

server/db.ts

@@ -414,23 +414,25 @@ export async function getInvoiceStats(userId: number) {
 }
 
 export async function findDuplicateInvoice(
-  supplierName: string | null,
   invoiceNumber: string | null,
-  invoiceDate: Date | null
+  totalAmount: string | null,
+  userId?: number
 ): Promise<Invoice | undefined> {
-  if (!supplierName || !invoiceNumber || !invoiceDate) return undefined;
+  if (!invoiceNumber || !totalAmount) return undefined;
   
   const db = await getDb();
   if (!db) return undefined;
   
+  const conditions = [
+    eq(invoices.invoiceNumber, invoiceNumber),
+    eq(invoices.totalAmount, totalAmount),
+  ];
+  if (userId !== undefined) {
+    conditions.push(eq(invoices.userId, userId));
+  }
+  
   const result = await db.select().from(invoices)
-    .where(
-      and(
-        eq(invoices.supplierName, supplierName),
-        eq(invoices.invoiceNumber, invoiceNumber),
-        eq(invoices.invoiceDate, invoiceDate)
-      )
-    )
+    .where(and(...conditions))
     .limit(1);
   
   return result[0];