GET /v2/performance/reporting-entities/:id/private-markets

Get point-in-time private-market performance metrics — NAV,
commitments, multiples, IRR, cash-flow summary — for a reporting
entity. One row per (date, currency, instrument).

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

Query params:
  date     (typically required) — Reporting date (ISO 8601). See public docs
                                  for supported date / range parameter shapes.

Response (200 OK):
{
  "data": [
    {
      "id": "string",
      "type": "private-market-performance",
      "attributes": {
        "nav":              "number — NAV in fund currency",
        "navDate":          "ISO 8601 date — NAV-as-of date",
        "date":             "ISO 8601 date — reporting date",
        "reportingCcyCode": "string — ISO 4217 reporting currency",
        "fundCcyCode":      "string — ISO 4217 fund currency",
        "marketValue":      "number — current market value in reporting currency",
        "commitmentInFundCurrency": {
          "total":    "number",
          "called":   "number — capital called to date",
          "uncalled": "number"
        },
        "commitmentInReportingCurrency": {
          "total":    "number",
          "called":   "number",
          "uncalled": "number"
        },
        "multiplier": {
          "dpi":  "number — Distributions to Paid-In",
          "rvpi": "number — Residual Value to Paid-In",
          "tvpi": "number — Total Value to Paid-In (DPI + RVPI)"
        },
        "cashflow": {
          "drawdowns":     "number — total contributions, in reporting currency",
          "distributions": "number — total distributions, in reporting currency"
        },
        "return": "number — total absolute return, in reporting currency",
        "irr":    "number — Internal Rate of Return as a decimal (0.1542 = 15.42%)"
      },
      "relationships": {
        "reportingEntity": { "type": "reporting-entity", "id": "string" },
        "instrument":      { "type": "instrument", "id": "string (optional)" }
      }
    }
  ]
}