Allow model and data catalogues to keep track of whether a project is active

[ots22]

• Help manage expectations for users
• Ideally a field present in the model/data-local metadata (responsibility of model/data provider, not the catalogue author)

Suggestion of @miquelmassot

[edwardchalstrey1]

Not sure if it is realistic to expect model or data submissions to the catalog to update metadata in this way. Maybe a more automated option could be to check when the last commit on the model/data repo was?