Time stamps and validity of a frame are usually set by the Calibration Time-stamp editor web service http://calts.astro-wise.orgCalTS, but they can also be changed at the awe-prompt. After changing these attributes the object can be commited to the database using the recommit method. Notice that only the timestamp_start, timestamp_end and is_valid (super flag) can be (re)commited to the database in this manner, any other attribute that is changed will not be updated in the database.
WARNING: the recommit(s) have been commented out in this example, these will change the timestamps and is_valid of the BiasFrame in the database!!
# query for a BiasFrame awe> qry = BiasFrame.instrument.name == 'WFI' awe> bias = qry # substract one day from the timestamps start awe> bias.timestamp_start -= datetime.timedelta(1) # and set timestamp_end to far future awe> bias.timestamp_end = datetime.datetime(2010, 1, 1) # and commit changes to the database awe> #bias.recommit() # make the BiasFrame invalid awe> bias.is_valid = 0 awe> #bias.recommit() # make the BiasFrame valid again awe> bias.is_valid = 1 awe> #bias.recommit()