Attempt to add new column during write of multiple rows in a single transaction fails

[rufuspollock]

Attempt this sort of thing:

import webstore.client
db, table = webstore.client.URL('http://localhost:5001/test/test/data')
rows = [
    { 'a': '1' },
    { 'b': '1' }
    ]
table.writerows(rows)

It will fail with:

webstore.client.WebstoreClientException: (OperationalError) database is locked u'\nALTER TABLE data ADD b TEXT' ()

[rufuspollock]

General feeling (@pudo and me) is that this is a wontfix but we should put up a prominent health warning and explain why this is a problem.