1. Sales Overview:
   • GET /api/metrics/sales - Get total sales, discounted sales, net sales, and the total number of orders.
   • Additional data: Average order value (calculated from total sales and the total number of orders), conversion rate (calculated from the total number of orders and the number of registered users).
2. Product Metrics:
   • GET /api/metrics/products - Get top-selling products and product-wise sales distribution.
   • Additional data: Total available stock for each product.
3. User Metrics:
   • GET /api/metrics/users - Get the number of registered users, gender distribution, and age distribution.
   • Additional data: Average user age (calculated from the sum of ages divided by the total number of users), percentage of users with accounts linked to social media.
4. Cart Metrics:
   • GET /api/metrics/cart - Get average cart value, most frequently added products to the cart, and total abandoned carts.
   • Additional data: Average time spent in the cart (calculated from user interaction timestamps), percentage of completed purchases (calculated from completed orders and abandoned carts).