def backwards(self, orm):
    db.delete_unique('umessages_messagecontact', ['from_user_id', 'to_user_id'])
    db.delete_table('umessages_messagecontact')
    db.delete_table('umessages_messagerecipient')
    db.delete_table('umessages_message')
def backwards(self, orm):
    db.delete_unique('umessages_messagecontact', ['from_user_id', 'to_user_id'])
    db.delete_table('umessages_messagecontact')
    db.delete_table('umessages_messagerecipient')
    db.delete_table('umessages_message')