As a part of #976, great care should be taken to make sure the airtable data that is used to create a segment of a GTFS feed is formatted correctly and is able to be used properly. The documentation for how segmentation should occur is noted in gtfs service data notation for isolating GTFS Services within GTFS Datasets.

The following checks should be performed:

• Verifying the validity of the data for segmenting a feed. (There should not be more than one * entry, there should not be an empty criteria when criteria exists for another relationship referring to the same feed).
• Verifying that exact ID matches are present in the downloaded feeds

This should probably be done in some nightly validation task that could block other tasks from proceeding.