UsageRecord

One metered interaction with cost estimates from the gateway rate table.

{
    "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"
}