UserUsageSummary

{
    "user_id": "string",
    "total_tokens": 0,
    "total_cost": 1.2345,
    "records": [
        {
            "session_id": "string",
            "model": "claude-sonnet-4-6",
            "provider": "bedrock",
            "tokens": 0,
            "prompt_tokens": 0,
            "completion_tokens": 0,
            "cost_usd": 0.000425,
            "timestamp": "2019-08-24T14:15:22.123Z"
        }
    ]
}