| | 98 | Each config file requires an entry in the {{{options/epoch}}} field. An ''epoch'' in the context of {{{ippToPsps}}} is the date that we count as ''the beginning''. If we loaded IPP data to PSPS once and only once, this would not be necessary: we would queue up all available exposures and stacks and simply load them. However, the early stages of the project have required multiple re-loads of data while the IPP perfects the science, necessitating that the same exposures and stacks are loaded more than once. Because {{{ippToPsps}}} queues available items by taking into account those that have already been published to PSPS, we have to give it an epoch date from which to accurately determine those exposure that have been loaded or not. Generally speaking, the epoch is reset every time we delete the main PSPS database. |
