nowa funckcja i male zmiany w js

app.py

@@ -610,6 +610,21 @@ def edit_my_list(list_id):
     return render_template("edit_my_list.html", list=l)
 
 
+@app.route("/delete_user_list/<int:list_id>", methods=["POST"])
+@login_required
+def delete_user_list(list_id):
+    l = db.session.get(ShoppingList, list_id)
+    if l is None or l.owner_id != current_user.id:
+        abort(403)
+    delete_receipts_for_list(list_id)
+    Item.query.filter_by(list_id=list_id).delete()
+    Expense.query.filter_by(list_id=list_id).delete()
+    db.session.delete(l)
+    db.session.commit()
+    flash("Lista została usunięta", "success")
+    return redirect(url_for("main_page"))
+
+
 @app.route("/toggle_visibility/<int:list_id>", methods=["GET", "POST"])
 @login_required
 def toggle_visibility(list_id):