added price history to build_product_details/models

src/monitor_utils/models.py

@@ -54,12 +54,14 @@ class PricingInfo:
         current_price: Current listed price.
         price_before_drop: Stored price prior to the last detected drop.
         edu_price: Education-store price when offered.
+        past_prices: Prior price history as price/date entries, oldest first.
     """
 
     original_price: float
     current_price: float
     price_before_drop: float | None = None
     edu_price: float | None = None
+    past_prices: list[dict] | None = None
 
 
 @dataclass

src/monitor_utils/runner.py

@@ -204,6 +204,7 @@ def build_product_details(
             original_price=original_price,
             price_before_drop=product["priceBeforeDrop"],
             edu_price=product["eduPrice"],
+            past_prices=product["pastPrices"],
         ),
         availability=AvailabilityInfo(
             available=product["available"],