def METHOD_NAME(self, orm):
    # Adding field 'HostMaintenance.hostname'
    db.add_column(u'maintenance_hostmaintenance', 'hostname',
                  self.gf('django.db.models.fields.CharField')(
                      default=u'', max_length=255),
                  keep_default=False)
    # Changing field 'HostMaintenance.host'
    db.alter_column(u'maintenance_hostmaintenance', 'host_id', self.gf(
        'django.db.models.fields.related.ForeignKey')(null=True, on_delete=models.SET_NULL, to=orm['physical.Host']))