API endpoint for details about a dataset

[MalinAhlberg]

Please describe the feature

As an admin, I want to be able to get detailed info about a given dataset so that I can easily check that I can verify that my dataset contains all the files I expect it to.

Either a new endpoint or add more details to the output of /datasets/list. Or maybe a grafana dashboard.

Acceptance criteria

• Tests verifying the changes are added

Additional context

The Swedish dataset submission document (confluence) has a step:

Check that the <dataset_id> is added to the sda.dataset_event_log table in the database with a registered event. Moreover, check that all accession IDs are listed under the accession_ids of that record.

The api endpoint should help doing that.

Estimation of size

medium

Estimation of priority

high

[jbygdell]

Currently the datasets/list gives this output for each dataset that exists:

{
  "DatasetId": "zz-dataset-123456-asdfgh",
  "Status": "registered",
  "Timestamp": "2025-03-30T09:10:11.321Z"
}

What else is missing, the number of files?
In that case the output could easily be expanded to look more like this:

{
  "DatasetId": "zz-dataset-123456-asdfgh",
  "Files": 2048,
  "Status": "registered",
  "Timestamp": "2025-03-30T09:10:11.321Z"
}