feat(migration): enforce ownerId requirement in Product table

- Removed all products without an owner to maintain data integrity.
- Updated ownerId column to be non-nullable.
- Modified foreign key constraint for ownerId to use ON DELETE CASCADE.

backend/src/receipt-import/receipt-import.controller.ts

@@ -49,6 +49,7 @@ export class ReceiptImportController {
       );
     }
     const isPremium = req?.user?.isPremium === true || req?.user?.role === 'admin';
-    return this.receiptImportService.parseReceipt(file, isPremium);
+    const userId = typeof req?.user?.id === 'number' ? req.user.id : undefined;
+    return this.receiptImportService.parseReceipt(file, isPremium, userId);
   }
 }

backend/src/receipt-import/receipt-import.service.ts

@@ -55,12 +55,12 @@ export class ReceiptImportService {
     private readonly categoriesService: CategoriesService,
   ) {}
 
-  async parseReceipt(file: Express.Multer.File, isPremium = false): Promise<ParsedReceiptItem[]> {
+  async parseReceipt(file: Express.Multer.File, isPremium = false, userId?: number): Promise<ParsedReceiptItem[]> {
     // Steg 1: Delegera AI-parsning till microservice-importer
     const rawItems = await this.parseReceiptViaImporter(file);
 
     // Steg 2: Matchning mot produktdatabas (kräver DB — stannar i recipe-app)
-    const matched = await this.matchProducts(rawItems);
+    const matched = await this.matchProducts(rawItems, userId);
 
     // Steg 3: AI-kategorisering för premium-användare
     if (isPremium) {
@@ -110,15 +110,21 @@ export class ReceiptImportService {
 
   private async matchProducts(
     items: ParsedReceiptItem[],
+    userId?: number,
   ): Promise<ParsedReceiptItem[]> {
-    // Hämta alias och produkter parallellt
+    // Hämta alias och produkter parallellt — filtrera på userId om angivet
+    const productFilter = userId ? { isActive: true, ownerId: userId } : { isActive: true };
+    const aliasFilter = userId
+      ? { product: { ownerId: userId } }
+      : {};
     const [aliases, products] = await Promise.all([
       this.prisma.receiptAlias.findMany({
-        select: { receiptName: true, productId: true, product: { select: { id: true, name: true, canonicalName: true } } },
+        where: aliasFilter,
+        select: { receiptName: true, productId: true, product: { select: { id: true, name: true, canonicalName: true, categoryId: true, categoryRef: { select: { id: true, name: true, path: true } } } } },
       }),
       this.prisma.product.findMany({
-        where: { isActive: true },
-        select: { id: true, name: true, canonicalName: true },
+        where: productFilter,
+        select: { id: true, name: true, canonicalName: true, categoryId: true, categoryRef: { select: { id: true, name: true, path: true } } },
       }),
     ]);
 
@@ -129,29 +135,34 @@ export class ReceiptImportService {
       // 1. Alias-match (säker, användaren behöver inte bekräfta)
       const alias = aliases.find((a) => a.receiptName === raw);
       if (alias) {
+        const cat = alias.product.categoryRef;
         return {
           ...item,
           matchedProductId: alias.product.id,
           matchedProductName: alias.product.canonicalName ?? alias.product.name,
+          ...(cat ? { categorySuggestion: { categoryId: cat.id, categoryName: cat.name, path: cat.path, confidence: 'high' as const, usedFallback: false } } : {}),
         };
       }
 
       // 2. Ordbaserad matchning (förslag, kräver bekräftelse)
       const suggestion = this.findWordMatch(raw, products);
+      if (!suggestion) {
+        return { ...item };
+      }
+      const cat = suggestion.categoryRef;
       return {
         ...item,
-        suggestedProductId: suggestion?.id,
-        suggestedProductName: suggestion
-          ? (suggestion.canonicalName ?? suggestion.name)
-          : undefined,
+        suggestedProductId: suggestion.id,
+        suggestedProductName: suggestion.canonicalName ?? suggestion.name,
+        ...(cat ? { categorySuggestion: { categoryId: cat.id, categoryName: cat.name, path: cat.path, confidence: 'medium' as const, usedFallback: false } } : {}),
       };
     });
   }
 
   private findWordMatch(
     raw: string,
-    products: { id: number; name: string; canonicalName: string | null }[],
-  ): { id: number; name: string; canonicalName: string | null } | undefined {
+    products: { id: number; name: string; canonicalName: string | null; categoryId: number | null; categoryRef: { id: number; name: string; path: string } | null }[],
+  ): { id: number; name: string; canonicalName: string | null; categoryId: number | null; categoryRef: { id: number; name: string; path: string } | null } | undefined {
     // Dela upp kvittonamnet i ord (min 3 tecken)
     const rawWords = tokenize(raw);
     if (rawWords.length === 0) return undefined;
@@ -229,7 +240,8 @@ export class ReceiptImportService {
   }
 
   private async enrichWithAiCategories(items: ParsedReceiptItem[]): Promise<ParsedReceiptItem[]> {
-    const unmatched = items.filter((i) => !i.matchedProductId && !i.suggestedProductId && i.rawName);
+    // Kör regler/AI för alla items som saknar categorySuggestion och har ett rawName
+    const unmatched = items.filter((i) => !i.categorySuggestion && i.rawName);
     if (unmatched.length === 0) return items;
 
     let categories: Awaited<ReturnType<CategoriesService['findFlattened']>>;