CustomFeedFolderV1

{
    "type": "custom_feed_folder",
    "id": "42",
    "attributes": {
        "name": "Marketing Feeds",
        "preset_folder": "High-Intent Pages",
        "created_at": "2026-01-10T08:00:00.000Z",
        "updated_at": "2026-01-15T12:00:00.000Z"
    },
    "relationships": {
        "custom_feeds": [
            {
                "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
                "type": "custom_feed"
            }
        ]
    }
}