Only managers can approve studies and custom approval message

@aurreco-uga I'll reply to these one-by-one

as long as it is clear.. the rows correspond to end users who (1) requested access to a study (and either got it or were denied), OR (2) were given access to a study directly via dashboard (without sending a formal request, reason why their purpose is empty).

The name EndUser really threw me off for a long time. Calling it EndUser really leads me to believe that there's a single row for every end user. However, there's a row per access user/dataset! I'll adjust the comment to make it a little more clear that it may also apply to someone who was directly given access.

VEuPathDB / service-dataset-access

Only managers can approve studies and custom approval message #75

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