I was reminded of this after a discussion on Slack: the VisitSummary table is not versioned. We continue to add fields to it, and may modify fields in the future. This means that future Pipelines code cannot determine if it should be able to access a given field from the VisitSummary catalog or not (e.g., we have a future backwards compatibility problem).

The other various catalogs in postprocess.py should likely also be versioned, but I don't know what ones are there or how they evolve with time.