From dc0d0614bb2b5d8108dc40b912f58a52dbdd888e Mon Sep 17 00:00:00 2001
From: ben <johnmosescarter@gmail.com>
Date: Mon, 23 Mar 2026 12:53:54 -0400
Subject: [PATCH] Add effective price to purchases

---
 build_purchases.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/build_purchases.py b/build_purchases.py
index 3784aa6..06ae4c5 100644
--- a/build_purchases.py
+++ b/build_purchases.py
@@ -51,6 +51,7 @@ PURCHASE_FIELDS = [
     "price_per_lb_basis",
     "price_per_oz",
     "price_per_oz_basis",
+    "effective_price",
     "is_discount_line",
     "is_coupon_line",
     "is_fee",
@@ -172,6 +173,24 @@ def derive_metrics(row):
     }
 
 
+def derive_effective_price(row):
+    normalized_quantity = to_decimal(row.get("normalized_quantity"))
+    if normalized_quantity in (None, Decimal("0")):
+        return ""
+
+    net_line_total = to_decimal(row.get("net_line_total"))
+    line_total = to_decimal(row.get("line_total"))
+    numerator = (
+        net_line_total
+        if net_line_total not in (None, Decimal("0"))
+        else line_total
+    )
+    if numerator is None:
+        return ""
+
+    return format_decimal(numerator / normalized_quantity)
+
+
 def order_lookup(rows, retailer):
     return {(retailer, row["order_id"]): row for row in rows}
 
@@ -353,6 +372,7 @@ def build_purchase_rows(
                 "store_number": order_row.get("store_number", ""),
                 "store_city": order_row.get("store_city", ""),
                 "store_state": order_row.get("store_state", ""),
+                "effective_price": derive_effective_price(row),
                 "is_discount_line": row["is_discount_line"],
                 "is_coupon_line": row["is_coupon_line"],
                 "is_fee": row["is_fee"],