remove hardcoded db

src/backend/database.py

@@ -34,7 +34,7 @@ class Database:
     Initialize the database and create the tables if they do not exist.
     """
 
-    def __init__(self, db_path: str = "sap.db"):
+    def __init__(self, db_path: str = None):
         """
         Default constructor for the database class