simplified the bbox creation

backend/src/structs/shopping_location.py

@@ -0,0 +1,23 @@
+from typing import Literal, Optional
+from pydantic import BaseModel
+
+
+class ShoppingLocation(BaseModel):
+    """"
+    A classe representing an interesting area for shopping.
+    
+    It can represent either a general area or a specifc route with start and end point.
+    The importance represents the number of shops found in this cluster.
+    
+    Attributes:
+        type :       either a 'street' or 'area' (representing a denser field of shops).
+        importance : size of the cluster (number of points).
+        centroid :   center of the cluster.
+        start :      if the type is a street it goes from here...
+        end :        ...to here
+    """
+    type: Literal['street', 'area']
+    importance: int
+    centroid: tuple
+    start: Optional[list] = None
+    end: Optional[list] = None