now create an owned on /owned, rather than /owned/-1 kludge. Also using sequence for creation. All good - made sequences for all relevant tables too. Last question is how to do redirect to /owneds and still show messsage

main.py

@@ -112,6 +112,7 @@ class Book(db.Model):
     def LastSubBookNum(self):
         # need to work out the last sub book and return an id?
         if self.IsParent():
+            # -1 subscript returns the last one
             return self.child_ref[-1].sub_book_num
         else:
             return 1