feat(receipt-import): add rule-based category suggestion logic for items

feat(migrations): add new categories for lactose-free products and allergy options

backend/prisma/migrations/20260502133000_rename_allergi_mjolk_to_laktosfri_mjolk/migration.sql

@@ -0,0 +1,63 @@
+-- Ensure Allergi mejeri uses "Laktosfri mjölk" as L3 node.
+
+-- 1) Rename old node when no target node exists yet.
+UPDATE `Category` c_old
+JOIN `Category` c2
+  ON c_old.parentId = c2.id
+  AND c2.name = 'Allergi mejeri'
+JOIN `Category` c1
+  ON c2.parentId = c1.id
+  AND c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+LEFT JOIN `Category` c_new
+  ON c_new.parentId = c2.id
+  AND c_new.name = 'Laktosfri mjölk'
+SET c_old.name = 'Laktosfri mjölk'
+WHERE c_old.name = 'Mjölk'
+  AND c_new.id IS NULL;
+
+-- 2) Re-point product links from old node to new node if both exist.
+UPDATE `Product` p
+JOIN `Category` c_old
+  ON p.categoryId = c_old.id
+  AND c_old.name = 'Mjölk'
+JOIN `Category` c2
+  ON c_old.parentId = c2.id
+  AND c2.name = 'Allergi mejeri'
+JOIN `Category` c1
+  ON c2.parentId = c1.id
+  AND c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+JOIN `Category` c_new
+  ON c_new.parentId = c2.id
+  AND c_new.name = 'Laktosfri mjölk'
+SET p.categoryId = c_new.id;
+
+-- 3) Remove duplicate old node when both old and new exist.
+DELETE c_old
+FROM `Category` c_old
+JOIN `Category` c2
+  ON c_old.parentId = c2.id
+  AND c2.name = 'Allergi mejeri'
+JOIN `Category` c1
+  ON c2.parentId = c1.id
+  AND c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+JOIN `Category` c_new
+  ON c_new.parentId = c2.id
+  AND c_new.name = 'Laktosfri mjölk'
+WHERE c_old.name = 'Mjölk';
+
+-- 4) Create missing target node if needed.
+INSERT INTO `Category` (`name`, `parentId`)
+SELECT 'Laktosfri mjölk', c2.id
+FROM `Category` c1
+JOIN `Category` c2
+  ON c2.parentId = c1.id
+  AND c2.name = 'Allergi mejeri'
+LEFT JOIN `Category` c3
+  ON c3.parentId = c2.id
+  AND c3.name = 'Laktosfri mjölk'
+WHERE c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+  AND c3.id IS NULL;

backend/prisma/migrations/20260502134500_add_l3_kvarg_cottage_in_dairy_branches/migration.sql

@@ -0,0 +1,31 @@
+-- Ensure L3 "Kvarg & Cottage cheese" exists in both dairy branches:
+-- 1) Mejeri, ost & ägg > Allergi mejeri
+-- 2) Mejeri, ost & ägg > Kvarg & Cottage cheese
+
+-- Branch 1: under Allergi mejeri
+INSERT INTO `Category` (`name`, `parentId`)
+SELECT 'Kvarg & Cottage cheese', c2.id
+FROM `Category` c1
+JOIN `Category` c2
+  ON c2.parentId = c1.id
+  AND c2.name = 'Allergi mejeri'
+LEFT JOIN `Category` c3
+  ON c3.parentId = c2.id
+  AND c3.name = 'Kvarg & Cottage cheese'
+WHERE c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+  AND c3.id IS NULL;
+
+-- Branch 2: under standard Kvarg & Cottage cheese branch
+INSERT INTO `Category` (`name`, `parentId`)
+SELECT 'Kvarg & Cottage cheese', c2.id
+FROM `Category` c1
+JOIN `Category` c2
+  ON c2.parentId = c1.id
+  AND c2.name = 'Kvarg & Cottage cheese'
+LEFT JOIN `Category` c3
+  ON c3.parentId = c2.id
+  AND c3.name = 'Kvarg & Cottage cheese'
+WHERE c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+  AND c3.id IS NULL;

backend/prisma/migrations/20260502135500_add_allergi_mejeri_matfett_l3/migration.sql

@@ -0,0 +1,15 @@
+-- Ensure L3 "Matfett" exists under:
+-- Mejeri, ost & ägg > Allergi mejeri
+
+INSERT INTO `Category` (`name`, `parentId`)
+SELECT 'Matfett', c2.id
+FROM `Category` c1
+JOIN `Category` c2
+  ON c2.parentId = c1.id
+  AND c2.name = 'Allergi mejeri'
+LEFT JOIN `Category` c3
+  ON c3.parentId = c2.id
+  AND c3.name = 'Matfett'
+WHERE c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+  AND c3.id IS NULL;

backend/prisma/migrations/20260502141000_add_allergi_matlagning_l3/migration.sql

@@ -0,0 +1,15 @@
+-- Ensure L3 "Allergi matlagning" exists under:
+-- Mejeri, ost & ägg > Matlagning
+
+INSERT INTO `Category` (`name`, `parentId`)
+SELECT 'Allergi matlagning', c2.id
+FROM `Category` c1
+JOIN `Category` c2
+  ON c2.parentId = c1.id
+  AND c2.name = 'Matlagning'
+LEFT JOIN `Category` c3
+  ON c3.parentId = c2.id
+  AND c3.name = 'Allergi matlagning'
+WHERE c1.name = 'Mejeri, ost & ägg'
+  AND c1.parentId IS NULL
+  AND c3.id IS NULL;

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

@@ -6,7 +6,7 @@ import {
 } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
 import { ParsedReceiptItem } from './dto/parsed-receipt-item.dto';
-import { AiService } from '../ai/ai.service';
+import { AiService, CategorySuggestion } from '../ai/ai.service';
 import { CategoriesService } from '../categories/categories.service';
 
 const IMPORTER_SERVICE_URL =
@@ -32,6 +32,15 @@ function tokenize(value: string): string[] {
     .filter((w) => w.length >= 3);
 }
 
+function normalizeForRules(value: string): string {
+  return value
+    .toLowerCase()
+    .normalize('NFD')
+    .replace(/[\u0300-\u036f]/g, '')
+    .replace(/[^a-z0-9]+/g, ' ')
+    .trim();
+}
+
 @Injectable()
 export class ReceiptImportService {
   private readonly logger = new Logger(ReceiptImportService.name);
@@ -221,6 +230,12 @@ export class ReceiptImportService {
     const enriched = new Map<string, ParsedReceiptItem>();
     for (const item of unmatched) {
       try {
+        const byRule = this.ruleBasedCategorySuggestion(item.rawName, categories);
+        if (byRule) {
+          enriched.set(item.rawName, { ...item, categorySuggestion: byRule });
+          continue;
+        }
+
         const suggestion = await this.aiService.suggestCategory(item.rawName, categories);
         enriched.set(item.rawName, { ...item, categorySuggestion: suggestion });
       } catch {
@@ -231,4 +246,61 @@ export class ReceiptImportService {
 
     return items.map((item) => enriched.get(item.rawName) ?? item);
   }
+
+  private ruleBasedCategorySuggestion(
+    rawName: string,
+    categories: Awaited<ReturnType<CategoriesService['findFlattened']>>,
+  ): CategorySuggestion | null {
+    const normalized = normalizeForRules(rawName);
+
+    const isCookingBase =
+      /\bmatlagningsbas\b/.test(normalized) ||
+      /\bmatlagnings\b/.test(normalized) ||
+      /\bplant\s+cream\b/.test(normalized) ||
+      /\bcreme\s+fraiche\b/.test(normalized) ||
+      /\bgradde\b/.test(normalized) ||
+      /\bvispgradde\b/.test(normalized);
+
+    const isPlantOrAllergy =
+      /\blaktosfri\b/.test(normalized) ||
+      /\bvegetabilisk\b/.test(normalized) ||
+      /\bhavre\b/.test(normalized) ||
+      /\bsoja\b/.test(normalized) ||
+      /\brisdryck\b/.test(normalized) ||
+      /\bplant\b/.test(normalized);
+
+    if (!isCookingBase || !isPlantOrAllergy) return null;
+
+    const l3AllergyCooking = categories.find(
+      (c) =>
+        c.name.toLowerCase() === 'allergi matlagning' &&
+        c.path.toLowerCase().startsWith('matlagning > '),
+    );
+    if (l3AllergyCooking) {
+      return {
+        categoryId: l3AllergyCooking.id,
+        categoryName: l3AllergyCooking.name,
+        path: l3AllergyCooking.path,
+        confidence: 'high',
+        usedFallback: false,
+      };
+    }
+
+    const l2Cooking = categories.find(
+      (c) =>
+        c.name.toLowerCase() === 'matlagning' &&
+        c.path.toLowerCase() === 'mejeri, ost & ägg > matlagning',
+    );
+    if (l2Cooking) {
+      return {
+        categoryId: l2Cooking.id,
+        categoryName: l2Cooking.name,
+        path: l2Cooking.path,
+        confidence: 'medium',
+        usedFallback: false,
+      };
+    }
+
+    return null;
+  }
 }

db/seeds/seed_all.sql

@@ -331,13 +331,21 @@ INSERT INTO `Category` (`name`, `parentId`)
 
 -- ── NIVÅ 3: under Mejeri, ost & ägg > Allergi mejeri ────────────────
 INSERT INTO `Category` (`name`, `parentId`)
-  SELECT 'Mjölk', c2.id FROM `Category` c1
+  SELECT 'Laktosfri mjölk', c2.id FROM `Category` c1
   JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Allergi mejeri'
   WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
 INSERT INTO `Category` (`name`, `parentId`)
   SELECT 'Filmjölk & Yoghurt', c2.id FROM `Category` c1
   JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Allergi mejeri'
   WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
+INSERT INTO `Category` (`name`, `parentId`)
+  SELECT 'Kvarg & Cottage cheese', c2.id FROM `Category` c1
+  JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Allergi mejeri'
+  WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
+INSERT INTO `Category` (`name`, `parentId`)
+  SELECT 'Matfett', c2.id FROM `Category` c1
+  JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Allergi mejeri'
+  WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
 
 -- ── NIVÅ 3: under Mejeri, ost & ägg > Mjölk (standard) ───────────────
 INSERT INTO `Category` (`name`, `parentId`)
@@ -354,6 +362,10 @@ INSERT INTO `Category` (`name`, `parentId`)
   SELECT 'Matlagningsyoghurt', c2.id FROM `Category` c1
   JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Matlagning'
   WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
+INSERT INTO `Category` (`name`, `parentId`)
+  SELECT 'Allergi matlagning', c2.id FROM `Category` c1
+  JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Matlagning'
+  WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
 
 -- ── NIVÅ 3: under Mejeri, ost & ägg > Smör, margarin & jäst ────────────
 INSERT INTO `Category` (`name`, `parentId`)
@@ -372,6 +384,10 @@ INSERT INTO `Category` (`name`, `parentId`)
   WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
 
 -- ── NIVÅ 3: under Mejeri, ost & ägg > Kvarg & Cottage cheese ────────────
+INSERT INTO `Category` (`name`, `parentId`)
+  SELECT 'Kvarg & Cottage cheese', c2.id FROM `Category` c1
+  JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Kvarg & Cottage cheese'
+  WHERE c1.name = 'Mejeri, ost & ägg' AND c1.parentId IS NULL;
 INSERT INTO `Category` (`name`, `parentId`)
   SELECT 'Kvarg', c2.id FROM `Category` c1
   JOIN `Category` c2 ON c2.parentId = c1.id AND c2.name = 'Kvarg & Cottage cheese'