Can't store arrays in a single table

The error message from the scraperwiki library was very unhelpful. Before the scraper was trying to save an array to a db field. I've just done the simplest thing and stored the array as a json encoded string. You could, of course, have a separate table (as per normal sql) to store the bills. It's up to you.

Anyway, the scraper is now saving something. Over to you! :-)