curl --request GET \
  --url https://api.hyperspell.com/context-documents/data-summary \
  --header 'Authorization: Bearer <token>'

{
  "sources": [
    {
      "source": "<string>",
      "count": 123,
      "oldest": "2023-11-07T05:31:56Z",
      "newest": "2023-11-07T05:31:56Z",
      "sample_titles": [
        "<string>"
      ]
    }
  ],
  "total_resources": 123,
  "pipeline_mode": "<string>"
}