Add assets for the Automated Amazon Price Tracking article

examples/automated_price_tracking/check_prices.py

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+import os
+import asyncio
+from database import Database
+from dotenv import load_dotenv
+from firecrawl import FirecrawlApp
+from scraper import scrape_product
+from notifications import send_price_alert
+
+load_dotenv()
+
+db = Database(os.getenv("POSTGRES_URL"))
+app = FirecrawlApp()
+
+# Threshold percentage for price drop alerts (e.g., 5% = 0.05)
+PRICE_DROP_THRESHOLD = 0.05
+
+
+async def check_prices():
+    products = db.get_all_products()
+    product_urls = set(product.url for product in products)
+
+    for product_url in product_urls:
+        # Get the price history
+        price_history = db.get_price_history(product_url)
+        if not price_history:
+            continue
+
+        # Get the earliest recorded price
+        earliest_price = price_history[-1].price
+
+        # Retrieve updated product data
+        updated_product = scrape_product(product_url)
+        current_price = updated_product["price"]
+
+        # Add the price to the database
+        db.add_price(updated_product)
+        print(f"Added new price entry for {updated_product['name']}")
+
+        # Check if price dropped below threshold
+        if earliest_price > 0:  # Avoid division by zero
+            price_drop = (earliest_price - current_price) / earliest_price
+            if price_drop >= PRICE_DROP_THRESHOLD:
+                await send_price_alert(
+                    updated_product["name"], earliest_price, current_price, product_url
+                )
+
+
+if __name__ == "__main__":
+    asyncio.run(check_prices())