feat: add unit mapping functionality

- Added new API path for unit mappings in `api_paths.dart`.
- Implemented `upsertUnitMapping` method in `ImportRepository` to handle unit mapping creation.
- Updated `ReceiptImportTab` to learn and save unit mappings during receipt import.
- Created DTO for unit mapping with validation in `create-unit-mapping.dto.ts`.
- Added SQL migration for `UnitMapping` table creation with necessary constraints.

backend/dist/receipt-import/receipt-import.controller.js

@@ -18,6 +18,7 @@ const throttler_1 = require("@nestjs/throttler");
 const platform_express_1 = require("@nestjs/platform-express");
 const multer_1 = require("multer");
 const receipt_import_service_1 = require("./receipt-import.service");
+const create_unit_mapping_dto_1 = require("./dto/create-unit-mapping.dto");
 const passport_1 = require("@nestjs/passport");
 const ALLOWED_MIMES = [
     'image/jpeg',
@@ -47,6 +48,17 @@ let ReceiptImportController = class ReceiptImportController {
         await this.receiptImportService.loadCategories();
         return { message: 'Kategorier har uppdaterats.' };
     }
+    async upsertUnitMapping(dto, req) {
+        const userId = typeof req?.user?.id === 'number'
+            ? req.user.id
+            : typeof req?.user?.userId === 'number'
+                ? req.user.userId
+                : undefined;
+        if (!userId) {
+            throw new common_1.BadRequestException('Kunde inte identifiera användaren.');
+        }
+        return this.receiptImportService.upsertUnitMapping(userId, dto.productId, dto.originalUnit, dto.preferredUnit);
+    }
 };
 exports.ReceiptImportController = ReceiptImportController;
 __decorate([
@@ -70,6 +82,15 @@ __decorate([
     __metadata("design:paramtypes", []),
     __metadata("design:returntype", Promise)
 ], ReceiptImportController.prototype, "refreshCategories", null);
+__decorate([
+    (0, common_1.Post)('unit-mappings'),
+    (0, common_1.UseGuards)((0, passport_1.AuthGuard)('jwt')),
+    __param(0, (0, common_1.Body)()),
+    __param(1, (0, common_1.Request)()),
+    __metadata("design:type", Function),
+    __metadata("design:paramtypes", [create_unit_mapping_dto_1.CreateUnitMappingDto, Object]),
+    __metadata("design:returntype", Promise)
+], ReceiptImportController.prototype, "upsertUnitMapping", null);
 exports.ReceiptImportController = ReceiptImportController = __decorate([
     (0, common_1.Controller)('receipt-import'),
     __metadata("design:paramtypes", [receipt_import_service_1.ReceiptImportService])