add Brand Management

backend/main.py

@@ -26,32 +26,45 @@ app.add_middleware(
 
 def build_shopping_event_response(event: models.ShoppingEvent, db: Session) -> schemas.ShoppingEventResponse:
     """Build a shopping event response with products from the association table"""
-    # Get products with their event-specific data
+    # Get products with their event-specific data including brand information
     product_data = db.execute(
         text("""
             SELECT p.id, p.name, p.category, p.organic, p.weight, p.weight_unit,
-                   sep.amount, sep.price
+                   sep.amount, sep.price, b.id as brand_id, b.name as brand_name,
+                   b.created_at as brand_created_at, b.updated_at as brand_updated_at
             FROM products p
             JOIN shopping_event_products sep ON p.id = sep.product_id
+            LEFT JOIN brands b ON p.brand_id = b.id
             WHERE sep.shopping_event_id = :event_id
         """),
         {"event_id": event.id}
     ).fetchall()
     
     # Convert to ProductWithEventData objects
-    products_with_data = [
-        schemas.ProductWithEventData(
-            id=row.id,
-            name=row.name,
-            category=row.category,
-            organic=row.organic,
-            weight=row.weight,
-            weight_unit=row.weight_unit,
-            amount=row.amount,
-            price=row.price
+    products_with_data = []
+    for row in product_data:
+        brand = None
+        if row.brand_id is not None:
+            brand = schemas.Brand(
+                id=row.brand_id,
+                name=row.brand_name,
+                created_at=row.brand_created_at,
+                updated_at=row.brand_updated_at
+            )
+        
+        products_with_data.append(
+            schemas.ProductWithEventData(
+                id=row.id,
+                name=row.name,
+                category=row.category,
+                brand=brand,
+                organic=row.organic,
+                weight=row.weight,
+                weight_unit=row.weight_unit,
+                amount=row.amount,
+                price=row.price
+            )
         )
-        for row in product_data
-    ]
     
     return schemas.ShoppingEventResponse(
         id=event.id,
@@ -72,6 +85,12 @@ def read_root():
 # Product endpoints
 @app.post("/products/", response_model=schemas.Product)
 def create_product(product: schemas.ProductCreate, db: Session = Depends(get_db)):
+    # Validate brand exists if brand_id is provided
+    if product.brand_id is not None:
+        brand = db.query(models.Brand).filter(models.Brand.id == product.brand_id).first()
+        if brand is None:
+            raise HTTPException(status_code=404, detail="Brand not found")
+    
     db_product = models.Product(**product.dict())
     db.add(db_product)
     db.commit()
@@ -96,7 +115,13 @@ def update_product(product_id: int, product_update: schemas.ProductUpdate, db: S
     if product is None:
         raise HTTPException(status_code=404, detail="Product not found")
     
+    # Validate brand exists if brand_id is being updated
     update_data = product_update.dict(exclude_unset=True)
+    if 'brand_id' in update_data and update_data['brand_id'] is not None:
+        brand = db.query(models.Brand).filter(models.Brand.id == update_data['brand_id']).first()
+        if brand is None:
+            raise HTTPException(status_code=404, detail="Brand not found")
+    
     for field, value in update_data.items():
         setattr(product, field, value)
     
@@ -159,6 +184,59 @@ def delete_shop(shop_id: int, db: Session = Depends(get_db)):
     db.commit()
     return {"message": "Shop deleted successfully"}
 
+# Brand endpoints
+@app.post("/brands/", response_model=schemas.Brand)
+def create_brand(brand: schemas.BrandCreate, db: Session = Depends(get_db)):
+    db_brand = models.Brand(**brand.dict())
+    db.add(db_brand)
+    db.commit()
+    db.refresh(db_brand)
+    return db_brand
+
+@app.get("/brands/", response_model=List[schemas.Brand])
+def read_brands(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    brands = db.query(models.Brand).offset(skip).limit(limit).all()
+    return brands
+
+@app.get("/brands/{brand_id}", response_model=schemas.Brand)
+def read_brand(brand_id: int, db: Session = Depends(get_db)):
+    brand = db.query(models.Brand).filter(models.Brand.id == brand_id).first()
+    if brand is None:
+        raise HTTPException(status_code=404, detail="Brand not found")
+    return brand
+
+@app.put("/brands/{brand_id}", response_model=schemas.Brand)
+def update_brand(brand_id: int, brand_update: schemas.BrandUpdate, db: Session = Depends(get_db)):
+    brand = db.query(models.Brand).filter(models.Brand.id == brand_id).first()
+    if brand is None:
+        raise HTTPException(status_code=404, detail="Brand not found")
+    
+    update_data = brand_update.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(brand, field, value)
+    
+    db.commit()
+    db.refresh(brand)
+    return brand
+
+@app.delete("/brands/{brand_id}")
+def delete_brand(brand_id: int, db: Session = Depends(get_db)):
+    brand = db.query(models.Brand).filter(models.Brand.id == brand_id).first()
+    if brand is None:
+        raise HTTPException(status_code=404, detail="Brand not found")
+    
+    # Check if any products reference this brand
+    products_with_brand = db.query(models.Product).filter(models.Product.brand_id == brand_id).first()
+    if products_with_brand:
+        raise HTTPException(
+            status_code=400, 
+            detail="Cannot delete brand: products are still associated with this brand"
+        )
+    
+    db.delete(brand)
+    db.commit()
+    return {"message": "Brand deleted successfully"}
+
 # Shopping Event endpoints
 @app.post("/shopping-events/", response_model=schemas.ShoppingEventResponse)
 def create_shopping_event(event: schemas.ShoppingEventCreate, db: Session = Depends(get_db)):

backend/models.py

@@ -17,12 +17,24 @@ shopping_event_products = Table(
     Column('price', Float, nullable=False)  # Price of this product at the time of this shopping event
 )
 
+class Brand(Base):
+    __tablename__ = "brands"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False, index=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    
+    # Relationships
+    products = relationship("Product", back_populates="brand")
+
 class Product(Base):
     __tablename__ = "products"
     
     id = Column(Integer, primary_key=True, index=True)
     name = Column(String, nullable=False, index=True)
     category = Column(String, nullable=False)
+    brand_id = Column(Integer, ForeignKey("brands.id"), nullable=True)
     organic = Column(Boolean, default=False)
     weight = Column(Float, nullable=True)  # in grams or kg
     weight_unit = Column(String, default="piece")  # "g", "kg", "ml", "l", "piece"
@@ -30,6 +42,7 @@ class Product(Base):
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())
     
     # Relationships
+    brand = relationship("Brand", back_populates="products")
     shopping_events = relationship("ShoppingEvent", secondary=shopping_event_products, back_populates="products")
 
 class Shop(Base):

backend/schemas.py

@@ -2,10 +2,29 @@ from pydantic import BaseModel, Field
 from typing import Optional, List
 from datetime import datetime
 
+# Brand schemas
+class BrandBase(BaseModel):
+    name: str
+
+class BrandCreate(BrandBase):
+    pass
+
+class BrandUpdate(BaseModel):
+    name: Optional[str] = None
+
+class Brand(BrandBase):
+    id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    class Config:
+        from_attributes = True
+
 # Base schemas
 class ProductBase(BaseModel):
     name: str
     category: str
+    brand_id: Optional[int] = None
     organic: bool = False
     weight: Optional[float] = None
     weight_unit: str = "g"
@@ -16,6 +35,7 @@ class ProductCreate(ProductBase):
 class ProductUpdate(BaseModel):
     name: Optional[str] = None
     category: Optional[str] = None
+    brand_id: Optional[int] = None
     organic: Optional[bool] = None
     weight: Optional[float] = None
     weight_unit: Optional[str] = None
@@ -24,6 +44,7 @@ class Product(ProductBase):
     id: int
     created_at: datetime
     updated_at: Optional[datetime] = None
+    brand: Optional[Brand] = None
     
     class Config:
         from_attributes = True
@@ -60,6 +81,7 @@ class ProductWithEventData(BaseModel):
     id: int
     name: str
     category: str
+    brand: Optional[Brand] = None
     organic: bool
     weight: Optional[float] = None
     weight_unit: str

database_schema dev.drawio

@@ -1,6 +1,6 @@
 <mxfile host="65bd71144e">
     <diagram name="Product Tracker Database Schema" id="database-schema">
-        <mxGraphModel dx="999" dy="529" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="1169" pageHeight="827" math="0" shadow="0">
+        <mxGraphModel dx="577" dy="426" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="1169" pageHeight="827" math="0" shadow="0">
             <root>
                 <mxCell id="0"/>
                 <mxCell id="1" parent="0"/>
@@ -35,7 +35,7 @@
                 <mxCell id="diagram-title" value="Product Tracker Database Schema" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=20;fontStyle=1;" parent="1" vertex="1">
                     <mxGeometry x="400" y="20" width="320" height="40" as="geometry"/>
                 </mxCell>
-                <mxCell id="2" value="&lt;span style=&quot;color: rgb(0, 0, 0); text-wrap-mode: wrap;&quot;&gt;products&lt;/span&gt;" style="shape=table;startSize=30;container=1;collapsible=1;childLayout=tableLayout;fixedRows=1;rowLines=0;fontStyle=1;align=center;resizeLast=1;html=1;" parent="1" vertex="1">
+                <mxCell id="2" value="&lt;span style=&quot;color: rgb(0, 0, 0); text-wrap-mode: wrap;&quot;&gt;groceries&lt;/span&gt;" style="shape=table;startSize=30;container=1;collapsible=1;childLayout=tableLayout;fixedRows=1;rowLines=0;fontStyle=1;align=center;resizeLast=1;html=1;" parent="1" vertex="1">
                     <mxGeometry x="390" y="440" width="180" height="180" as="geometry"/>
                 </mxCell>
                 <mxCell id="3" value="" style="shape=tableRow;horizontal=0;startSize=0;swimlaneHead=0;swimlaneBody=0;fillColor=none;collapsible=0;dropTarget=0;points=[[0,0.5],[1,0.5]];portConstraint=eastwest;top=0;left=0;right=0;bottom=1;" parent="2" vertex="1">
@@ -438,7 +438,7 @@
                         <mxRectangle width="30" height="30" as="alternateBounds"/>
                     </mxGeometry>
                 </mxCell>
-                <mxCell id="172" value="product_id: INTEGER" style="shape=partialRectangle;connectable=0;fillColor=none;top=0;left=0;bottom=0;right=0;align=left;spacingLeft=6;overflow=hidden;" parent="170" vertex="1">
+                <mxCell id="172" value="grocery_id: INTEGER" style="shape=partialRectangle;connectable=0;fillColor=none;top=0;left=0;bottom=0;right=0;align=left;spacingLeft=6;overflow=hidden;" parent="170" vertex="1">
                     <mxGeometry x="30" width="150" height="30" as="geometry">
                         <mxRectangle width="150" height="30" as="alternateBounds"/>
                     </mxGeometry>

frontend/src/App.tsx

@@ -3,6 +3,7 @@ import { BrowserRouter as Router, Routes, Route, Link, useLocation } from 'react
 import Dashboard from './components/Dashboard';
 import ProductList from './components/ProductList';
 import ShopList from './components/ShopList';
+import BrandList from './components/BrandList';
 import ShoppingEventList from './components/ShoppingEventList';
 import ShoppingEventForm from './components/ShoppingEventForm';
 
@@ -38,6 +39,12 @@ function Navigation() {
           >
             Shops
           </Link>
+          <Link 
+            to="/brands"
+            className={`px-3 py-2 rounded ${isActive('/brands') ? 'bg-blue-800' : 'hover:bg-blue-700'}`}
+          >
+            Brands
+          </Link>
           <Link 
             to="/shopping-events"
             className={`px-3 py-2 rounded ${isActive('/shopping-events') ? 'bg-blue-800' : 'hover:bg-blue-700'}`}
@@ -60,6 +67,7 @@ function App() {
             <Route path="/" element={<Dashboard />} />
             <Route path="/products" element={<ProductList />} />
             <Route path="/shops" element={<ShopList />} />
+            <Route path="/brands" element={<BrandList />} />
             <Route path="/shopping-events" element={<ShoppingEventList />} />
             <Route path="/shopping-events/:id/edit" element={<ShoppingEventForm />} />
             <Route path="/add-purchase" element={<ShoppingEventForm />} />

frontend/src/components/AddBrandModal.tsx

@@ -0,0 +1,149 @@
+import React, { useState, useEffect } from 'react';
+import { brandApi } from '../services/api';
+import { Brand } from '../types';
+
+interface AddBrandModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onBrandAdded: () => void;
+  editBrand?: Brand | null;
+}
+
+interface BrandFormData {
+  name: string;
+}
+
+const AddBrandModal: React.FC<AddBrandModalProps> = ({ isOpen, onClose, onBrandAdded, editBrand }) => {
+  const [formData, setFormData] = useState<BrandFormData>({
+    name: ''
+  });
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState('');
+
+  const isEditMode = !!editBrand;
+
+  // Initialize form data when editing
+  useEffect(() => {
+    if (editBrand) {
+      setFormData({
+        name: editBrand.name
+      });
+    } else {
+      setFormData({
+        name: ''
+      });
+    }
+    setError('');
+  }, [editBrand, isOpen]);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    if (!formData.name.trim()) {
+      setError('Please enter a brand name');
+      return;
+    }
+
+    try {
+      setLoading(true);
+      setError('');
+      
+      const brandData = {
+        name: formData.name.trim()
+      };
+      
+      if (isEditMode && editBrand) {
+        await brandApi.update(editBrand.id, brandData);
+      } else {
+        await brandApi.create(brandData);
+      }
+      
+      // Reset form
+      setFormData({
+        name: ''
+      });
+      
+      onBrandAdded();
+      onClose();
+    } catch (err) {
+      setError(`Failed to ${isEditMode ? 'update' : 'add'} brand. Please try again.`);
+      console.error(`Error ${isEditMode ? 'updating' : 'adding'} brand:`, err);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const { name, value } = e.target;
+    setFormData(prev => ({
+      ...prev,
+      [name]: value
+    }));
+  };
+
+  if (!isOpen) return null;
+
+  return (
+    <div className="fixed inset-0 bg-gray-600 bg-opacity-50 overflow-y-auto h-full w-full z-50">
+      <div className="relative top-20 mx-auto p-5 border w-96 shadow-lg rounded-md bg-white">
+        <div className="mt-3">
+          <div className="flex justify-between items-center mb-4">
+            <h3 className="text-lg font-medium text-gray-900">
+              {isEditMode ? 'Edit Brand' : 'Add New Brand'}
+            </h3>
+            <button
+              onClick={onClose}
+              className="text-gray-400 hover:text-gray-600"
+            >
+              <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+              </svg>
+            </button>
+          </div>
+
+          {error && (
+            <div className="mb-4 bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded">
+              {error}
+            </div>
+          )}
+
+          <form onSubmit={handleSubmit} className="space-y-4">
+            <div>
+              <label htmlFor="name" className="block text-sm font-medium text-gray-700">
+                Brand Name *
+              </label>
+              <input
+                type="text"
+                id="name"
+                name="name"
+                value={formData.name}
+                onChange={handleChange}
+                required
+                className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
+                placeholder="e.g., Coca-Cola, Nestlé, Apple"
+              />
+            </div>
+
+            <div className="flex justify-end space-x-3 pt-4">
+              <button
+                type="button"
+                onClick={onClose}
+                className="px-4 py-2 text-sm font-medium text-gray-700 bg-gray-100 hover:bg-gray-200 rounded-md"
+              >
+                Cancel
+              </button>
+              <button
+                type="submit"
+                disabled={loading}
+                className="px-4 py-2 text-sm font-medium text-white bg-blue-600 hover:bg-blue-700 rounded-md disabled:opacity-50 disabled:cursor-not-allowed"
+              >
+                {loading ? (isEditMode ? 'Updating...' : 'Adding...') : (isEditMode ? 'Update Brand' : 'Add Brand')}
+              </button>
+            </div>
+          </form>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default AddBrandModal; 

frontend/src/components/AddProductModal.tsx

@@ -1,6 +1,6 @@
 import React, { useState, useEffect } from 'react';
-import { productApi } from '../services/api';
-import { Product } from '../types';
+import { productApi, brandApi } from '../services/api';
+import { Product, Brand } from '../types';
 
 interface AddProductModalProps {
   isOpen: boolean;
@@ -12,6 +12,7 @@ interface AddProductModalProps {
 interface ProductFormData {
   name: string;
   category: string;
+  brand_id?: number;
   organic: boolean;
   weight?: number;
   weight_unit: string;
@@ -21,10 +22,12 @@ const AddProductModal: React.FC<AddProductModalProps> = ({ isOpen, onClose, onPr
   const [formData, setFormData] = useState<ProductFormData>({
     name: '',
     category: '',
+    brand_id: undefined,
     organic: false,
     weight: undefined,
     weight_unit: 'piece'
   });
+  const [brands, setBrands] = useState<Brand[]>([]);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState('');
 
@@ -35,12 +38,29 @@ const AddProductModal: React.FC<AddProductModalProps> = ({ isOpen, onClose, onPr
 
   const weightUnits = ['piece', 'g', 'kg', 'lb', 'oz', 'ml', 'l'];
 
+  // Fetch brands when modal opens
+  useEffect(() => {
+    if (isOpen) {
+      fetchBrands();
+    }
+  }, [isOpen]);
+
+  const fetchBrands = async () => {
+    try {
+      const response = await brandApi.getAll();
+      setBrands(response.data);
+    } catch (err) {
+      console.error('Error fetching brands:', err);
+    }
+  };
+
   // Populate form when editing
   useEffect(() => {
     if (editProduct) {
       setFormData({
         name: editProduct.name,
         category: editProduct.category,
+        brand_id: editProduct.brand_id,
         organic: editProduct.organic,
         weight: editProduct.weight,
         weight_unit: editProduct.weight_unit
@@ -50,6 +70,7 @@ const AddProductModal: React.FC<AddProductModalProps> = ({ isOpen, onClose, onPr
       setFormData({
         name: '',
         category: '',
+        brand_id: undefined,
         organic: false,
         weight: undefined,
         weight_unit: 'piece'
@@ -71,7 +92,8 @@ const AddProductModal: React.FC<AddProductModalProps> = ({ isOpen, onClose, onPr
       
       const productData = {
         ...formData,
-        weight: formData.weight || undefined
+        weight: formData.weight || undefined,
+        brand_id: formData.brand_id || undefined
       };
       
       if (editProduct) {
@@ -86,6 +108,7 @@ const AddProductModal: React.FC<AddProductModalProps> = ({ isOpen, onClose, onPr
       setFormData({
         name: '',
         category: '',
+        brand_id: undefined,
         organic: false,
         weight: undefined,
         weight_unit: 'piece'
@@ -107,6 +130,7 @@ const AddProductModal: React.FC<AddProductModalProps> = ({ isOpen, onClose, onPr
       ...prev,
       [name]: type === 'checkbox' ? (e.target as HTMLInputElement).checked 
              : type === 'number' ? (value === '' ? undefined : Number(value))
+             : name === 'brand_id' ? (value === '' ? undefined : Number(value))
              : value
     }));
   };
@@ -173,6 +197,24 @@ const AddProductModal: React.FC<AddProductModalProps> = ({ isOpen, onClose, onPr
               </select>
             </div>
 
+            <div>
+              <label htmlFor="brand_id" className="block text-sm font-medium text-gray-700">
+                Brand (Optional)
+              </label>
+              <select
+                id="brand_id"
+                name="brand_id"
+                value={formData.brand_id || ''}
+                onChange={handleChange}
+                className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
+              >
+                <option value="">Select a brand (optional)</option>
+                {brands.map(brand => (
+                  <option key={brand.id} value={brand.id}>{brand.name}</option>
+                ))}
+              </select>
+            </div>
+
             <div className="grid grid-cols-2 gap-3">
               <div>
                 <label htmlFor="weight" className="block text-sm font-medium text-gray-700">

frontend/src/components/BrandList.tsx

@@ -0,0 +1,184 @@
+import React, { useState, useEffect } from 'react';
+import { useSearchParams } from 'react-router-dom';
+import { Brand } from '../types';
+import { brandApi } from '../services/api';
+import AddBrandModal from './AddBrandModal';
+import ConfirmDeleteModal from './ConfirmDeleteModal';
+
+const BrandList: React.FC = () => {
+  const [searchParams, setSearchParams] = useSearchParams();
+  const [brands, setBrands] = useState<Brand[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState('');
+  const [isModalOpen, setIsModalOpen] = useState(false);
+  const [editingBrand, setEditingBrand] = useState<Brand | null>(null);
+  const [deletingBrand, setDeletingBrand] = useState<Brand | null>(null);
+  const [deleteLoading, setDeleteLoading] = useState(false);
+
+  useEffect(() => {
+    fetchBrands();
+    
+    // Check if we should auto-open the modal
+    if (searchParams.get('add') === 'true') {
+      setIsModalOpen(true);
+      // Remove the parameter from URL
+      setSearchParams({});
+    }
+  }, [searchParams, setSearchParams]);
+
+  const fetchBrands = async () => {
+    try {
+      setLoading(true);
+      const response = await brandApi.getAll();
+      setBrands(response.data);
+    } catch (err) {
+      setError('Failed to fetch brands');
+      console.error('Error fetching brands:', err);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const handleBrandAdded = () => {
+    fetchBrands(); // Refresh the brands list
+  };
+
+  const handleEditBrand = (brand: Brand) => {
+    setEditingBrand(brand);
+    setIsModalOpen(true);
+  };
+
+  const handleDeleteBrand = (brand: Brand) => {
+    setDeletingBrand(brand);
+  };
+
+  const confirmDelete = async () => {
+    if (!deletingBrand) return;
+
+    try {
+      setDeleteLoading(true);
+      await brandApi.delete(deletingBrand.id);
+      setDeletingBrand(null);
+      fetchBrands(); // Refresh the brands list
+    } catch (err: any) {
+      console.error('Error deleting brand:', err);
+      // Handle specific error message from backend
+      if (err.response?.status === 400) {
+        setError('Cannot delete brand: products are still associated with this brand');
+      } else {
+        setError('Failed to delete brand. Please try again.');
+      }
+    } finally {
+      setDeleteLoading(false);
+    }
+  };
+
+  const handleCloseModal = () => {
+    setIsModalOpen(false);
+    setEditingBrand(null);
+  };
+
+  const handleCloseDeleteModal = () => {
+    setDeletingBrand(null);
+  };
+
+  if (loading) {
+    return (
+      <div className="flex justify-center items-center h-64">
+        <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500"></div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      <div className="flex justify-between items-center">
+        <h1 className="text-2xl font-bold text-gray-900">Brands</h1>
+        <button 
+          onClick={() => setIsModalOpen(true)}
+          className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded"
+        >
+          Add New Brand
+        </button>
+      </div>
+
+      {error && (
+        <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded">
+          {error}
+        </div>
+      )}
+
+      <div className="bg-white shadow rounded-lg overflow-hidden">
+        {brands.length === 0 ? (
+          <div className="text-center py-12">
+            <svg className="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 48 48">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 7h.01M7 3h5c.512 0 1.024.195 1.414.586l7 7a2 2 0 010 2.828l-7 7a1.994 1.994 0 01-1.414.586H7m0-18v18m0-18h.01" />
+            </svg>
+            <h3 className="mt-2 text-sm font-medium text-gray-900">No brands</h3>
+            <p className="mt-1 text-sm text-gray-500">Get started by adding your first brand.</p>
+          </div>
+        ) : (
+          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6 p-6">
+            {brands.map((brand) => (
+              <div key={brand.id} className="bg-white border border-gray-200 rounded-lg p-6 hover:shadow-md transition-shadow">
+                <div className="flex items-center justify-between mb-4">
+                  <h3 className="text-lg font-medium text-gray-900">{brand.name}</h3>
+                  <div className="flex space-x-2">
+                    <button 
+                      onClick={() => handleEditBrand(brand)}
+                      className="text-indigo-600 hover:text-indigo-900 text-sm"
+                    >
+                      Edit
+                    </button>
+                    <button 
+                      onClick={() => handleDeleteBrand(brand)}
+                      className="text-red-600 hover:text-red-900 text-sm"
+                    >
+                      Delete
+                    </button>
+                  </div>
+                </div>
+                
+                <div className="space-y-2">
+                  <div className="flex items-center text-sm text-gray-600">
+                    <svg className="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z" />
+                    </svg>
+                    Added {new Date(brand.created_at).toLocaleDateString()}
+                  </div>
+                  
+                  {brand.updated_at && (
+                    <div className="flex items-center text-sm text-gray-600">
+                      <svg className="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
+                      </svg>
+                      Updated {new Date(brand.updated_at).toLocaleDateString()}
+                    </div>
+                  )}
+                </div>
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+
+      <AddBrandModal
+        isOpen={isModalOpen}
+        onClose={handleCloseModal}
+        onBrandAdded={handleBrandAdded}
+        editBrand={editingBrand}
+      />
+
+      <ConfirmDeleteModal
+        isOpen={!!deletingBrand}
+        onClose={handleCloseDeleteModal}
+        onConfirm={confirmDelete}
+        title="Delete Brand"
+        message={`Are you sure you want to delete "${deletingBrand?.name}"? This action cannot be undone.`}
+        isLoading={deleteLoading}
+      />
+    </div>
+  );
+};
+
+export default BrandList; 

frontend/src/components/ProductList.tsx

@@ -125,6 +125,9 @@ const ProductList: React.FC = () => {
                 <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                   Category
                 </th>
+                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
+                  Brand
+                </th>
                 <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                   Weight
                 </th>
@@ -149,6 +152,9 @@ const ProductList: React.FC = () => {
                       {product.category}
                     </span>
                   </td>
+                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900">
+                    {product.brand ? product.brand.name : '-'}
+                  </td>
                   <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900">
                     {product.weight ? `${product.weight}${product.weight_unit}` : '-'}
                   </td>

frontend/src/services/api.ts

@@ -1,4 +1,4 @@
-import { Product, ProductCreate, Shop, ShopCreate, ShoppingEvent, ShoppingEventCreate } from '../types';
+import { Product, ProductCreate, Shop, ShopCreate, ShoppingEvent, ShoppingEventCreate, Brand, BrandCreate } from '../types';
 
 const API_BASE_URL = 'http://localhost:8000';
 
@@ -41,6 +41,16 @@ export const shopApi = {
   delete: (id: number) => api.delete(`/shops/${id}`),
 };
 
+// Brand API functions
+export const brandApi = {
+  getAll: () => api.get<Brand[]>('/brands/'),
+  getById: (id: number) => api.get<Brand>(`/brands/${id}`),
+  create: (brand: BrandCreate) => api.post<Brand>('/brands/', brand),
+  update: (id: number, brand: Partial<BrandCreate>) =>
+    api.put<Brand>(`/brands/${id}`, brand),
+  delete: (id: number) => api.delete(`/brands/${id}`),
+};
+
 // Shopping Event API functions
 export const shoppingEventApi = {
   getAll: () => api.get<ShoppingEvent[]>('/shopping-events/'),

frontend/src/types/index.ts

@@ -1,7 +1,20 @@
+export interface Brand {
+  id: number;
+  name: string;
+  created_at: string;
+  updated_at?: string;
+}
+
+export interface BrandCreate {
+  name: string;
+}
+
 export interface Product {
   id: number;
   name: string;
   category: string;
+  brand_id?: number;
+  brand?: Brand;
   organic: boolean;
   weight?: number;
   weight_unit: string;
@@ -12,6 +25,7 @@ export interface Product {
 export interface ProductCreate {
   name: string;
   category: string;
+  brand_id?: number;
   organic: boolean;
   weight?: number;
   weight_unit: string;
@@ -42,6 +56,7 @@ export interface ProductWithEventData {
   id: number;
   name: string;
   category: string;
+  brand?: Brand;
   organic: boolean;
   weight?: number;
   weight_unit: string;