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- 新增迁移 20260424000000:为 usage_settlement_snapshots 添加 settlement_snapshot、 billing_dimensions、billing_input/output/cache tokens、billing_total_cost_usd 等列, 并创建 usage_billing_facts 视图(从 settlement snapshot 覆盖原始 usage token/cost 字段) - event_enrichment:构建结构化 settlement_snapshot(含 pricing_snapshot、billing_plan_snapshot、 resolved_dimensions、cost_breakdown 等),写入 request_metadata - pricing:新增 pricing_source() 方法区分 provider_override / global_default / unpriced - sql.rs:settlement snapshot 写入新列;用量汇总查询改用 usage_billing_facts 视图 - maintenance/runtime:所有统计查询的 FROM usage 替换为 FROM usage_billing_facts - admin observability:在 settlement 响应中暴露 settlement_snapshot / billing_dimensions, 并从 metadata 中剥离对应字段 - request_metadata:允许 settlement_snapshot / billing_dimensions 字段传播 - stream execution:在首个数据帧到达时记录 TTFB,补全流式请求的 streaming 事件