feat(flyer): add flyer session and selection system

- Add FlyerSession, FlyerItem, and FlyerSelection models to Prisma schema
- Implement session persistence with weekly key generation in FlyerImportService
- Add FlyerSelectionModule to AppModule
- Extend FlyerImportResponse with sessionId and flyerItemId fields
- Create new flyer-selection module directory structure
- Add migration for flyer session and selection tables

BREAKING CHANGE: Flyer import now persists data to FlyerSession and FlyerItem tables

backend/prisma/migrations/20260518190000_add_flyer_session_item_selection/migration.sql

@@ -0,0 +1,85 @@
+CREATE TABLE `FlyerSession` (
+  `id` INTEGER NOT NULL AUTO_INCREMENT,
+  `userId` INTEGER NOT NULL,
+  `retailer` VARCHAR(191) NOT NULL,
+  `weekKey` VARCHAR(191) NOT NULL,
+  `status` VARCHAR(191) NOT NULL DEFAULT 'draft',
+  `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updatedAt` DATETIME(3) NOT NULL,
+  `expiresAt` DATETIME(3) NULL,
+
+  INDEX `FlyerSession_userId_idx`(`userId`),
+  INDEX `FlyerSession_weekKey_idx`(`weekKey`),
+  INDEX `FlyerSession_status_idx`(`status`),
+  PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+CREATE TABLE `FlyerItem` (
+  `id` INTEGER NOT NULL AUTO_INCREMENT,
+  `sessionId` INTEGER NOT NULL,
+  `rawName` VARCHAR(191) NOT NULL,
+  `normalizedName` VARCHAR(191) NOT NULL,
+  `categoryHint` VARCHAR(191) NULL,
+  `price` DECIMAL(10, 2) NULL,
+  `priceUnit` VARCHAR(191) NULL,
+  `comparisonPrice` DECIMAL(10, 2) NULL,
+  `comparisonUnit` VARCHAR(191) NULL,
+  `offerText` VARCHAR(191) NULL,
+  `parseConfidence` DOUBLE NOT NULL,
+  `parseReasons` JSON NULL,
+  `matchedProductId` INTEGER NULL,
+  `matchedProductName` VARCHAR(191) NULL,
+  `matchedVia` VARCHAR(191) NULL,
+  `matchConfidence` DOUBLE NULL,
+  `matchReasons` JSON NULL,
+  `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updatedAt` DATETIME(3) NOT NULL,
+
+  INDEX `FlyerItem_sessionId_idx`(`sessionId`),
+  INDEX `FlyerItem_normalizedName_idx`(`normalizedName`),
+  PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+CREATE TABLE `FlyerSelection` (
+  `id` INTEGER NOT NULL AUTO_INCREMENT,
+  `sessionId` INTEGER NOT NULL,
+  `itemId` INTEGER NOT NULL,
+  `userId` INTEGER NOT NULL,
+  `plannedQuantity` DECIMAL(10, 2) NULL,
+  `plannedUnit` VARCHAR(191) NULL,
+  `priority` VARCHAR(191) NOT NULL DEFAULT 'normal',
+  `note` VARCHAR(191) NULL,
+  `status` VARCHAR(191) NOT NULL DEFAULT 'planned',
+  `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updatedAt` DATETIME(3) NOT NULL,
+
+  UNIQUE INDEX `FlyerSelection_sessionId_itemId_key`(`sessionId`, `itemId`),
+  INDEX `FlyerSelection_sessionId_idx`(`sessionId`),
+  INDEX `FlyerSelection_userId_status_idx`(`userId`, `status`),
+  PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+ALTER TABLE `FlyerSession`
+  ADD CONSTRAINT `FlyerSession_userId_fkey`
+  FOREIGN KEY (`userId`) REFERENCES `User`(`id`)
+  ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE `FlyerItem`
+  ADD CONSTRAINT `FlyerItem_sessionId_fkey`
+  FOREIGN KEY (`sessionId`) REFERENCES `FlyerSession`(`id`)
+  ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE `FlyerSelection`
+  ADD CONSTRAINT `FlyerSelection_sessionId_fkey`
+  FOREIGN KEY (`sessionId`) REFERENCES `FlyerSession`(`id`)
+  ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE `FlyerSelection`
+  ADD CONSTRAINT `FlyerSelection_itemId_fkey`
+  FOREIGN KEY (`itemId`) REFERENCES `FlyerItem`(`id`)
+  ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE `FlyerSelection`
+  ADD CONSTRAINT `FlyerSelection_userId_fkey`
+  FOREIGN KEY (`userId`) REFERENCES `User`(`id`)
+  ON DELETE CASCADE ON UPDATE CASCADE;

backend/prisma/schema.prisma

@@ -27,10 +27,12 @@ model User {
   ownedProducts Product[]
   inventoryItems InventoryItem[]
   pantryItems PantryItem[]
-  mealPlanEntries MealPlanEntry[]
+  mealPlanEntries MealPlanEntry[]
-  receiptAliases  ReceiptAlias[]
+  receiptAliases  ReceiptAlias[]
-  unitMappings     UnitMapping[]
+  unitMappings     UnitMapping[]
-}
+  flyerSessions    FlyerSession[]
+  flyerSelections  FlyerSelection[]
+}
 
 model Product {
   id             Int             @id @default(autoincrement())
@@ -264,7 +266,7 @@ model UnitMapping {
   @@index([userId])
 }
 
-model HelpText {
+model HelpText {
   id        Int      @id @default(autoincrement())
   key       String
   scope     String   @default("default")
@@ -274,6 +276,75 @@ model HelpText {
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
-  @@unique([key, scope])
+  @@unique([key, scope])
-  @@index([key, isActive])
+  @@index([key, isActive])
-}
+}
+
+model FlyerSession {
+  id         Int              @id @default(autoincrement())
+  userId     Int
+  retailer   String
+  weekKey    String
+  status     String           @default("draft")
+  createdAt  DateTime         @default(now())
+  updatedAt  DateTime         @updatedAt
+  expiresAt  DateTime?
+
+  user       User             @relation(fields: [userId], references: [id], onDelete: Cascade)
+  items      FlyerItem[]
+  selections FlyerSelection[]
+
+  @@index([userId])
+  @@index([weekKey])
+  @@index([status])
+}
+
+model FlyerItem {
+  id                 Int              @id @default(autoincrement())
+  sessionId          Int
+  rawName            String
+  normalizedName     String
+  categoryHint       String?
+  price              Decimal?         @db.Decimal(10, 2)
+  priceUnit          String?
+  comparisonPrice    Decimal?         @db.Decimal(10, 2)
+  comparisonUnit     String?
+  offerText          String?
+  parseConfidence    Float
+  parseReasons       Json?
+  matchedProductId   Int?
+  matchedProductName String?
+  matchedVia         String?
+  matchConfidence    Float?
+  matchReasons       Json?
+  createdAt          DateTime         @default(now())
+  updatedAt          DateTime         @updatedAt
+
+  session            FlyerSession     @relation(fields: [sessionId], references: [id], onDelete: Cascade)
+  selections         FlyerSelection[]
+
+  @@index([sessionId])
+  @@index([normalizedName])
+}
+
+model FlyerSelection {
+  id              Int          @id @default(autoincrement())
+  sessionId       Int
+  itemId          Int
+  userId          Int
+  plannedQuantity Decimal?     @db.Decimal(10, 2)
+  plannedUnit     String?
+  priority        String       @default("normal")
+  note            String?
+  status          String       @default("planned")
+  createdAt       DateTime     @default(now())
+  updatedAt       DateTime     @updatedAt
+
+  session         FlyerSession @relation(fields: [sessionId], references: [id], onDelete: Cascade)
+  item            FlyerItem    @relation(fields: [itemId], references: [id], onDelete: Cascade)
+  user            User         @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([sessionId, itemId])
+  @@index([sessionId])
+  @@index([userId, status])
+}

backend/src/app.module.ts

@@ -19,6 +19,7 @@ import { AiModule } from './ai/ai.module';
 import { RealtimeModule } from './realtime/realtime.module';
 import { HelpTextsModule } from './help-texts/help-texts.module';
 import { FlyerImportModule } from './flyer-import/flyer-import.module';
+import { FlyerSelectionModule } from './flyer-selection/flyer-selection.module';
 import { JwtAuthGuard } from './auth/jwt-auth.guard';
 import { RolesGuard } from './auth/roles.guard';
 
@@ -50,6 +51,7 @@ import { RolesGuard } from './auth/roles.guard';
     RealtimeModule,
     HelpTextsModule,
     FlyerImportModule,
+    FlyerSelectionModule,
   ],
   providers: [
     {

backend/src/flyer-import/dto/flyer-import.response.ts

@@ -1,6 +1,7 @@
 export type FlyerImportMatchVia = 'alias' | 'exact' | 'token' | 'none';
 
 export type FlyerImportItem = {
+  flyerItemId: number | null;
   rawName: string;
   normalizedName: string;
   category: string | null;
@@ -19,6 +20,7 @@ export type FlyerImportItem = {
 };
 
 export type FlyerImportResponse = {
+  sessionId: number | null;
   retailer: 'willys';
   parserVersion: 'v1';
   items: FlyerImportItem[];

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

@@ -4,6 +4,7 @@ import {
   Logger,
   ServiceUnavailableException,
 } from '@nestjs/common';
+import { Prisma } from '@prisma/client';
 import { PrismaService } from '../prisma/prisma.service';
 import { normalizeName } from '../common/utils/normalize-name';
 import {
@@ -79,6 +80,7 @@ export class FlyerImportService {
     const items: FlyerImportItem[] = parsed.items.map((item) => {
       const match = this.matchItem(item, products, aliasToProduct, productById);
       return {
+        flyerItemId: null,
         rawName: item.rawName,
         normalizedName: item.normalizedName,
         category: item.category,
@@ -97,14 +99,74 @@ export class FlyerImportService {
       };
     });
 
+    const persistedItems = await this.persistSessionWithItems(userId, parsed.retailer, items);
+
     return {
+      sessionId: persistedItems.sessionId,
       retailer: parsed.retailer,
       parserVersion: parsed.parserVersion,
-      items,
+      items: persistedItems.items,
       warnings: parsed.warnings,
     };
   }
 
+  private async persistSessionWithItems(
+    userId: number,
+    retailer: 'willys',
+    items: FlyerImportItem[],
+  ): Promise<{ sessionId: number; items: FlyerImportItem[] }> {
+    const weekKey = this.toWeekKey(new Date());
+
+    const session = await this.prisma.flyerSession.create({
+      data: {
+        userId,
+        retailer,
+        weekKey,
+        status: 'draft',
+      },
+      select: { id: true },
+    });
+
+    const savedItems: FlyerImportItem[] = [];
+    for (const item of items) {
+      const created = await this.prisma.flyerItem.create({
+        data: {
+          sessionId: session.id,
+          rawName: item.rawName,
+          normalizedName: item.normalizedName,
+          categoryHint: item.category,
+          price: item.price != null ? new Prisma.Decimal(item.price) : null,
+          priceUnit: item.priceUnit,
+          comparisonPrice:
+            item.comparisonPrice != null ? new Prisma.Decimal(item.comparisonPrice) : null,
+          comparisonUnit: item.comparisonUnit,
+          offerText: item.offerText,
+          parseConfidence: item.parseConfidence,
+          parseReasons: item.parseReasons,
+          matchedProductId: item.matchedProductId,
+          matchedProductName: item.matchedProductName,
+          matchedVia: item.matchedVia,
+          matchConfidence: item.matchConfidence,
+          matchReasons: item.matchReasons,
+        },
+        select: { id: true },
+      });
+
+      savedItems.push({ ...item, flyerItemId: created.id });
+    }
+
+    return { sessionId: session.id, items: savedItems };
+  }
+
+  private toWeekKey(date: Date): string {
+    const d = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
+    const dayNum = d.getUTCDay() || 7;
+    d.setUTCDate(d.getUTCDate() + 4 - dayNum);
+    const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
+    const weekNo = Math.ceil((((d.getTime() - yearStart.getTime()) / 86400000) + 1) / 7);
+    return `${d.getUTCFullYear()}-W${String(weekNo).padStart(2, '0')}`;
+  }
+
   private matchItem(
     item: FlyerParseItem,
     products: ProductLite[],

backend/src/flyer-selection/dto/create-flyer-selection.dto.ts

@@ -0,0 +1,38 @@
+import { Type } from 'class-transformer';
+import {
+  IsIn,
+  IsInt,
+  IsNumber,
+  IsOptional,
+  IsString,
+  MaxLength,
+  Min,
+} from 'class-validator';
+
+export class CreateFlyerSelectionDto {
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  itemId!: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsNumber({ maxDecimalPlaces: 2 })
+  @Min(0)
+  plannedQuantity?: number;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(24)
+  plannedUnit?: string;
+
+  @IsOptional()
+  @IsString()
+  @IsIn(['low', 'normal', 'high'])
+  priority?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  note?: string;
+}

backend/src/flyer-selection/dto/flyer-selection.response.ts

@@ -0,0 +1,22 @@
+export type FlyerSelectionResponse = {
+  id: number;
+  sessionId: number;
+  itemId: number;
+  userId: number;
+  plannedQuantity: number | null;
+  plannedUnit: string | null;
+  priority: string;
+  note: string | null;
+  status: string;
+  createdAt: string;
+  updatedAt: string;
+  item: {
+    id: number;
+    rawName: string;
+    normalizedName: string;
+    price: number | null;
+    priceUnit: string | null;
+    matchedProductId: number | null;
+    matchedProductName: string | null;
+  };
+};

backend/src/flyer-selection/dto/update-flyer-selection.dto.ts

@@ -0,0 +1,37 @@
+import { Type } from 'class-transformer';
+import {
+  IsIn,
+  IsNumber,
+  IsOptional,
+  IsString,
+  MaxLength,
+  Min,
+} from 'class-validator';
+
+export class UpdateFlyerSelectionDto {
+  @IsOptional()
+  @Type(() => Number)
+  @IsNumber({ maxDecimalPlaces: 2 })
+  @Min(0)
+  plannedQuantity?: number;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(24)
+  plannedUnit?: string;
+
+  @IsOptional()
+  @IsString()
+  @IsIn(['low', 'normal', 'high'])
+  priority?: string;
+
+  @IsOptional()
+  @IsString()
+  @IsIn(['planned', 'bought', 'skipped', 'archived'])
+  status?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  note?: string;
+}

backend/src/flyer-selection/flyer-selection.controller.ts

@@ -0,0 +1,82 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  HttpCode,
+  Param,
+  ParseIntPipe,
+  Patch,
+  Post,
+  Request,
+  Get,
+  BadRequestException,
+} from '@nestjs/common';
+import { Throttle } from '@nestjs/throttler';
+import { CreateFlyerSelectionDto } from './dto/create-flyer-selection.dto';
+import { FlyerSelectionResponse } from './dto/flyer-selection.response';
+import { UpdateFlyerSelectionDto } from './dto/update-flyer-selection.dto';
+import { FlyerSelectionService } from './flyer-selection.service';
+
+@Controller('flyer-sessions/:sessionId/selections')
+export class FlyerSelectionController {
+  constructor(private readonly flyerSelectionService: FlyerSelectionService) {}
+
+  @Get()
+  async list(
+    @Param('sessionId', ParseIntPipe) sessionId: number,
+    @Request() req?: any,
+  ): Promise<FlyerSelectionResponse[]> {
+    const userId = this.getUserId(req);
+    return this.flyerSelectionService.listBySession(sessionId, userId);
+  }
+
+  @Post()
+  @HttpCode(200)
+  @Throttle({ default: { ttl: 60_000, limit: 20 } })
+  async create(
+    @Param('sessionId', ParseIntPipe) sessionId: number,
+    @Body() dto: CreateFlyerSelectionDto,
+    @Request() req?: any,
+  ): Promise<FlyerSelectionResponse> {
+    const userId = this.getUserId(req);
+    return this.flyerSelectionService.create(sessionId, userId, dto);
+  }
+
+  @Patch(':selectionId')
+  @HttpCode(200)
+  @Throttle({ default: { ttl: 60_000, limit: 30 } })
+  async update(
+    @Param('sessionId', ParseIntPipe) sessionId: number,
+    @Param('selectionId', ParseIntPipe) selectionId: number,
+    @Body() dto: UpdateFlyerSelectionDto,
+    @Request() req?: any,
+  ): Promise<FlyerSelectionResponse> {
+    const userId = this.getUserId(req);
+    return this.flyerSelectionService.update(sessionId, selectionId, userId, dto);
+  }
+
+  @Delete(':selectionId')
+  @HttpCode(204)
+  @Throttle({ default: { ttl: 60_000, limit: 20 } })
+  async remove(
+    @Param('sessionId', ParseIntPipe) sessionId: number,
+    @Param('selectionId', ParseIntPipe) selectionId: number,
+    @Request() req?: any,
+  ): Promise<void> {
+    const userId = this.getUserId(req);
+    await this.flyerSelectionService.remove(sessionId, selectionId, userId);
+  }
+
+  private getUserId(req?: any): number {
+    const userId =
+      typeof req?.user?.id === 'number'
+        ? req.user.id
+        : typeof req?.user?.userId === 'number'
+          ? req.user.userId
+          : undefined;
+    if (!userId) {
+      throw new BadRequestException('Kunde inte identifiera användaren.');
+    }
+    return userId;
+  }
+}

backend/src/flyer-selection/flyer-selection.module.ts

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+import { PrismaModule } from '../prisma/prisma.module';
+import { FlyerSelectionController } from './flyer-selection.controller';
+import { FlyerSelectionService } from './flyer-selection.service';
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [FlyerSelectionController],
+  providers: [FlyerSelectionService],
+})
+export class FlyerSelectionModule {}

backend/src/flyer-selection/flyer-selection.service.ts

@@ -0,0 +1,198 @@
+import {
+  BadRequestException,
+  ForbiddenException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
+import { Prisma } from '@prisma/client';
+import { PrismaService } from '../prisma/prisma.service';
+import { CreateFlyerSelectionDto } from './dto/create-flyer-selection.dto';
+import { FlyerSelectionResponse } from './dto/flyer-selection.response';
+import { UpdateFlyerSelectionDto } from './dto/update-flyer-selection.dto';
+
+@Injectable()
+export class FlyerSelectionService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async listBySession(sessionId: number, userId: number): Promise<FlyerSelectionResponse[]> {
+    await this.assertSessionOwnership(sessionId, userId);
+    const rows = await this.prisma.flyerSelection.findMany({
+      where: { sessionId, userId },
+      include: {
+        item: {
+          select: {
+            id: true,
+            rawName: true,
+            normalizedName: true,
+            price: true,
+            priceUnit: true,
+            matchedProductId: true,
+            matchedProductName: true,
+          },
+        },
+      },
+      orderBy: { createdAt: 'desc' },
+    });
+
+    return rows.map((row) => this.toResponse(row));
+  }
+
+  async create(
+    sessionId: number,
+    userId: number,
+    dto: CreateFlyerSelectionDto,
+  ): Promise<FlyerSelectionResponse> {
+    await this.assertSessionOwnership(sessionId, userId);
+
+    const item = await this.prisma.flyerItem.findUnique({
+      where: { id: dto.itemId },
+      select: { id: true, sessionId: true },
+    });
+    if (!item || item.sessionId !== sessionId) {
+      throw new BadRequestException('Vald flyer-rad tillhör inte sessionen.');
+    }
+
+    const created = await this.prisma.flyerSelection.upsert({
+      where: {
+        sessionId_itemId: {
+          sessionId,
+          itemId: dto.itemId,
+        },
+      },
+      update: {
+        plannedQuantity:
+          dto.plannedQuantity == null ? undefined : new Prisma.Decimal(dto.plannedQuantity),
+        plannedUnit: dto.plannedUnit,
+        priority: dto.priority ?? 'normal',
+        note: dto.note,
+      },
+      create: {
+        sessionId,
+        itemId: dto.itemId,
+        userId,
+        plannedQuantity:
+          dto.plannedQuantity == null ? null : new Prisma.Decimal(dto.plannedQuantity),
+        plannedUnit: dto.plannedUnit ?? null,
+        priority: dto.priority ?? 'normal',
+        note: dto.note ?? null,
+      },
+      include: {
+        item: {
+          select: {
+            id: true,
+            rawName: true,
+            normalizedName: true,
+            price: true,
+            priceUnit: true,
+            matchedProductId: true,
+            matchedProductName: true,
+          },
+        },
+      },
+    });
+
+    return this.toResponse(created);
+  }
+
+  async update(
+    sessionId: number,
+    selectionId: number,
+    userId: number,
+    dto: UpdateFlyerSelectionDto,
+  ): Promise<FlyerSelectionResponse> {
+    await this.assertSessionOwnership(sessionId, userId);
+
+    const existing = await this.prisma.flyerSelection.findUnique({
+      where: { id: selectionId },
+      select: { id: true, sessionId: true, userId: true },
+    });
+    if (!existing || existing.sessionId !== sessionId) {
+      throw new NotFoundException('FlyerSelection hittades inte.');
+    }
+    if (existing.userId !== userId) {
+      throw new ForbiddenException('Du saknar åtkomst till denna selection.');
+    }
+
+    const updated = await this.prisma.flyerSelection.update({
+      where: { id: selectionId },
+      data: {
+        plannedQuantity:
+          dto.plannedQuantity == null ? undefined : new Prisma.Decimal(dto.plannedQuantity),
+        plannedUnit: dto.plannedUnit,
+        priority: dto.priority,
+        status: dto.status,
+        note: dto.note,
+      },
+      include: {
+        item: {
+          select: {
+            id: true,
+            rawName: true,
+            normalizedName: true,
+            price: true,
+            priceUnit: true,
+            matchedProductId: true,
+            matchedProductName: true,
+          },
+        },
+      },
+    });
+
+    return this.toResponse(updated);
+  }
+
+  async remove(sessionId: number, selectionId: number, userId: number): Promise<void> {
+    await this.assertSessionOwnership(sessionId, userId);
+
+    const existing = await this.prisma.flyerSelection.findUnique({
+      where: { id: selectionId },
+      select: { id: true, sessionId: true, userId: true },
+    });
+    if (!existing || existing.sessionId !== sessionId) {
+      throw new NotFoundException('FlyerSelection hittades inte.');
+    }
+    if (existing.userId !== userId) {
+      throw new ForbiddenException('Du saknar åtkomst till denna selection.');
+    }
+
+    await this.prisma.flyerSelection.delete({ where: { id: selectionId } });
+  }
+
+  private async assertSessionOwnership(sessionId: number, userId: number): Promise<void> {
+    const session = await this.prisma.flyerSession.findUnique({
+      where: { id: sessionId },
+      select: { id: true, userId: true },
+    });
+    if (!session) {
+      throw new NotFoundException('FlyerSession hittades inte.');
+    }
+    if (session.userId !== userId) {
+      throw new ForbiddenException('Du saknar åtkomst till denna session.');
+    }
+  }
+
+  private toResponse(row: any): FlyerSelectionResponse {
+    return {
+      id: row.id,
+      sessionId: row.sessionId,
+      itemId: row.itemId,
+      userId: row.userId,
+      plannedQuantity: row.plannedQuantity == null ? null : Number(row.plannedQuantity),
+      plannedUnit: row.plannedUnit ?? null,
+      priority: row.priority,
+      note: row.note ?? null,
+      status: row.status,
+      createdAt: row.createdAt.toISOString(),
+      updatedAt: row.updatedAt.toISOString(),
+      item: {
+        id: row.item.id,
+        rawName: row.item.rawName,
+        normalizedName: row.item.normalizedName,
+        price: row.item.price == null ? null : Number(row.item.price),
+        priceUnit: row.item.priceUnit ?? null,
+        matchedProductId: row.item.matchedProductId ?? null,
+        matchedProductName: row.item.matchedProductName ?? null,
+      },
+    };
+  }
+}