def register_redirect(original, new_url):
"""Register a new redirect. Also an old one that may still exist."""
original = _strip_url(original)
db.execute(redirects.delete(original=original))
db.execute(redirects.insert(), dict(
original=original,
new=_strip_url(new_url)
))
def unregister_redirect(url):
"""Unregister a redirect."""
rv = db.execute(redirects.delete(redirects.c.original == _strip_url(url)))
if not rv.rowcount:
raise ValueError('no such URL')
