Initial project scaffold

Full-stack Dutch supermarket price tracker with FastAPI backend,
PostgreSQL/SQLAlchemy, Albert Heijn scraper, and Next.js frontend.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/schemas.py

@@ -0,0 +1,75 @@
+from datetime import datetime
+
+from pydantic import BaseModel
+
+
+class Store(BaseModel):
+    id: int
+    name: str
+    slug: str
+    country: str
+    website: str | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class Product(BaseModel):
+    id: int
+    store_id: int
+    external_id: str
+    ean: str | None = None
+    name: str
+    brand: str | None = None
+    category: str | None = None
+    unit_size: str | None = None
+    url: str | None = None
+    created_at: datetime
+    updated_at: datetime
+    store: Store | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class ProductWithLatestPrice(Product):
+    latest_price: int | None = None
+    latest_price_timestamp: datetime | None = None
+    is_on_sale: bool = False
+
+
+class PriceSnapshot(BaseModel):
+    id: int
+    product_id: int
+    scrape_run_id: int
+    price: int
+    unit_price: int | None = None
+    unit_description: str | None = None
+    currency: str
+    discount_label: str | None = None
+    discount_description: str | None = None
+    was_price: int | None = None
+    is_on_sale: bool
+    timestamp: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class ScrapeRun(BaseModel):
+    id: int
+    store_id: int
+    query: str
+    started_at: datetime
+    finished_at: datetime | None = None
+    status: str
+    products_found: int
+    error_message: str | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class CheapestProduct(BaseModel):
+    product: Product
+    price: int
+    unit_price: int | None = None
+    unit_description: str | None = None
+    is_on_sale: bool
+    timestamp: datetime