GET /v2/custodian-holdings/legal-entities/:id

Get custodian-reported holdings for a legal entity on a single date.

Path params:
  id (required) — Legal-entity identifier.

Query params:
  date (required) — ISO 8601 date of the snapshot.

Response (200 OK):
{
  "data": [
    {
      "id": "string",
      "type": "custodian-holding",
      "attributes": {
        "date":           "ISO 8601 date",
        "unitsInHolding": "number"
      },
      "relationships": {
        "legalEntity": { "data": { "type": "legal-entity", "id": "string" } },
        "asset":       { "data": { "type": "asset", "id": "string" } },
        "depository":  { "data": { "type": "depository", "id": "string" } },
        "account":     { "data": { "type": "account", "id": "string" } }
      }
    }
  ]
}

Each row has `legalEntity` plus EITHER `asset` (+`depository`) OR
`account`, depending on what kind of holding the row describes.