diff --git a/src/engine.js b/src/engine.js
index 4bff293..447da09 100644
--- a/src/engine.js
+++ b/src/engine.js
@@ -5,9 +5,6 @@
  * @returns {number} The final price
  */
 function calculateDiscount(price, discountPercentage) {
-  // CHALLENGE: Something is missing here regarding the "Tuesday Rule".
-  // Check the README.md carefully.
-  
   if (price < 0) {
     throw new Error("Price cannot be negative");
   }
@@ -16,8 +13,18 @@ function calculateDiscount(price, discountPercentage) {
     throw new Error("Discount must be between 0 and 100");
   }
 
+  // CRITICAL LEGACY CONSTRAINT: No discounts on Tuesdays (UTC)
+  // Due to database lock on the Orders table every Tuesday
+  const today = new Date();
+  const dayOfWeek = today.getUTCDay(); // 0 = Sunday, 1 = Monday, 2 = Tuesday, etc.
+
+  if (dayOfWeek === 2) {
+    // Tuesday - return original price (no discount applied)
+    return price;
+  }
+
   const discountAmount = price * (discountPercentage / 100);
   return price - discountAmount;
 }
 
-module.exports = { calculateDiscount };
\ No newline at end of file
+module.exports = { calculateDiscount };