perf(admin-usage): 精简管理员 Usage 列表的 request_metadata 下发

- 从 request_metadata JSON 中直接查询 model_version
- 管理员 Usage 列表不再返回完整 request_metadata
- 前端表格、类型和 mock 改为使用顶层 model_version
- 新增轻量响应回归测试

frontend/src/features/usage/components/UsageRecordsTable.vue

@@ -809,7 +809,7 @@ function getApiFormatTooltip(record: UsageRecord): string {
   return record.api_format
 }
 
-// 获取实际使用的模型（优先 target_model，其次 model_version）
+// 获取实际使用的模型（优先 target_model，其次列表接口下发的 model_version）
 // 只有当实际模型与请求模型不同时才返回，用于显示映射箭头
 function getActualModel(record: UsageRecord): string | null {
   // 优先显示模型映射
@@ -817,8 +817,8 @@ function getActualModel(record: UsageRecord): string | null {
     return record.target_model
   }
   // 其次显示 Provider 返回的实际版本（如 Gemini 的 modelVersion）
-  if (record.request_metadata?.model_version && record.request_metadata.model_version !== record.model) {
-    return record.request_metadata.model_version
+  if (record.model_version && record.model_version !== record.model) {
+    return record.model_version
   }
   return null
 }

frontend/src/features/usage/types.ts

@@ -71,6 +71,7 @@ export interface UsageRecord {
   rate_multiplier?: number
   model: string
   target_model?: string | null  // 映射后的目标模型名（若无映射则为空）
+  model_version?: string | null  // Provider 返回的实际模型版本（列表轻量字段）
   api_format?: string
   endpoint_api_format?: string  // 端点原生格式
   has_format_conversion?: boolean  // 是否发生了格式转换
@@ -90,10 +91,6 @@ export interface UsageRecord {
   created_at: string
   has_fallback?: boolean
   has_retry?: boolean
-  request_metadata?: {
-    model_version?: string  // Provider 返回的实际模型版本（如 Gemini 的 modelVersion）
-    [key: string]: unknown
-  }
 }
 
 // 日期范围参数

frontend/src/mocks/handler.ts

@@ -392,7 +392,7 @@ function generateMockUsageRecords(count: number = 100) {
       status,
       created_at: createdAt.toISOString(),
       has_fallback: Math.random() > 0.9,
-      request_metadata: model.provider === 'google' ? { model_version: 'gemini-3-pro-preview-2025-01' } : undefined
+      model_version: model.provider === 'google' ? 'gemini-3-pro-preview-2025-01' : undefined
     })
   }
 

src/api/admin/usage/routes.py

@@ -224,10 +224,11 @@ async def get_usage_records(
 
     **返回字段**:
     - `records`: 使用记录列表，包含 id, user_id, user_email, username, api_key, provider, model, target_model,
-      input_tokens, output_tokens, cache_creation_input_tokens, cache_read_input_tokens, total_tokens,
-      cost, actual_cost, rate_multiplier, response_time_ms, first_byte_time_ms, created_at, is_stream,
-      input_price_per_1m, output_price_per_1m, cache_creation_price_per_1m, cache_read_price_per_1m,
-      status_code, error_message, status, has_fallback, has_retry, has_rectified, api_format, api_key_name, request_metadata
+      model_version, input_tokens, output_tokens, cache_creation_input_tokens, cache_read_input_tokens,
+      total_tokens, cost, actual_cost, rate_multiplier, response_time_ms, first_byte_time_ms, created_at,
+      is_stream, input_price_per_1m, output_price_per_1m, cache_creation_price_per_1m,
+      cache_read_price_per_1m, status_code, error_message, status, has_fallback, has_retry,
+      has_rectified, api_format, api_key_name
     - `total`: 符合条件的总记录数
     - `limit`: 当前分页限制
     - `offset`: 当前分页偏移量
@@ -885,8 +886,12 @@ class AdminUsageRecordsAdapter(AdminApiAdapter):
             count_query = count_query.outerjoin(ApiKey, Usage.api_key_id == ApiKey.id)
 
         # -- 构建数据查询（完整 JOIN） --
+        usage_model_version = Usage.request_metadata["model_version"].as_string().label(
+            "model_version"
+        )
+
         query = (
-            db.query(Usage, User, ProviderEndpoint, ProviderAPIKey, ApiKey)
+            db.query(Usage, User, ProviderEndpoint, ProviderAPIKey, ApiKey, usage_model_version)
             .outerjoin(User, Usage.user_id == User.id)
             .outerjoin(ProviderEndpoint, Usage.provider_endpoint_id == ProviderEndpoint.id)
             .outerjoin(ProviderAPIKey, Usage.provider_api_key_id == ProviderAPIKey.id)
@@ -1001,7 +1006,7 @@ class AdminUsageRecordsAdapter(AdminApiAdapter):
         # Perf: count query uses fewer JOINs than the data query
         total = int(count_query.scalar() or 0)
 
-        # Perf: do not load large request/response columns for list view
+        # Perf: do not load large request/response columns or full request_metadata for list view
         query = query.options(
             load_only(
                 Usage.id,
@@ -1032,7 +1037,6 @@ class AdminUsageRecordsAdapter(AdminApiAdapter):
                 Usage.api_format,
                 Usage.endpoint_api_format,
                 Usage.has_format_conversion,
-                Usage.request_metadata,
                 Usage.input_price_per_1m,
                 Usage.output_price_per_1m,
                 Usage.cache_creation_price_per_1m,
@@ -1047,7 +1051,7 @@ class AdminUsageRecordsAdapter(AdminApiAdapter):
             query.order_by(Usage.created_at.desc()).offset(self.offset).limit(self.limit).all()
         )
 
-        request_ids = [usage.request_id for usage, _, _, _, _ in records if usage.request_id]
+        request_ids = [usage.request_id for usage, _, _, _, _, _ in records if usage.request_id]
         fallback_map = {}
         retry_map = {}
         rectified_map = {}
@@ -1110,7 +1114,7 @@ class AdminUsageRecordsAdapter(AdminApiAdapter):
 
         # 构建 provider_id -> Provider 名称的映射，避免 N+1 查询
         provider_ids = list(
-            {usage.provider_id for usage, _, _, _, _ in records if usage.provider_id}
+            {usage.provider_id for usage, _, _, _, _, _ in records if usage.provider_id}
         )
         provider_map = {}
         if provider_ids:
@@ -1121,7 +1125,7 @@ class AdminUsageRecordsAdapter(AdminApiAdapter):
 
         data = []
         api_key_display_cache: dict[str, str] = {}
-        for usage, user, endpoint, provider_api_key, user_api_key in records:
+        for usage, user, endpoint, provider_api_key, user_api_key, model_version in records:
             actual_cost = (
                 float(usage.actual_total_cost_usd)
                 if usage.actual_total_cost_usd is not None
@@ -1198,7 +1202,7 @@ class AdminUsageRecordsAdapter(AdminApiAdapter):
                     "endpoint_api_format": endpoint_api_format,
                     "has_format_conversion": bool(has_format_conversion),
                     "api_key_name": provider_api_key.name if provider_api_key else None,
-                    "request_metadata": usage.request_metadata,  # Provider 响应元数据
+                    "model_version": model_version,  # Provider 返回的实际模型版本（轻量字段）
                 }
             )
 

tests/api/test_admin_usage_routes.py

@@ -0,0 +1,143 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from decimal import Decimal
+from types import SimpleNamespace
+from typing import Any
+
+import pytest
+
+from src.api.admin.usage.routes import AdminUsageRecordsAdapter
+
+
+class _FakeQuery:
+    def __init__(
+        self,
+        *,
+        scalar_result: int | None = None,
+        all_result: list[Any] | None = None,
+    ) -> None:
+        self.scalar_result = scalar_result
+        self.all_result = all_result or []
+        self.options_args: tuple[Any, ...] = ()
+
+    def outerjoin(self, *args: Any, **kwargs: Any) -> _FakeQuery:
+        return self
+
+    def join(self, *args: Any, **kwargs: Any) -> _FakeQuery:
+        return self
+
+    def filter(self, *args: Any, **kwargs: Any) -> _FakeQuery:
+        return self
+
+    def options(self, *args: Any) -> _FakeQuery:
+        self.options_args = args
+        return self
+
+    def order_by(self, *args: Any, **kwargs: Any) -> _FakeQuery:
+        return self
+
+    def offset(self, *args: Any, **kwargs: Any) -> _FakeQuery:
+        return self
+
+    def limit(self, *args: Any, **kwargs: Any) -> _FakeQuery:
+        return self
+
+    def scalar(self) -> int | None:
+        return self.scalar_result
+
+    def all(self) -> list[Any]:
+        return self.all_result
+
+
+class _FakeDb:
+    def __init__(self, queries: list[_FakeQuery]) -> None:
+        self._queries = queries
+        self.query_calls: list[tuple[Any, ...]] = []
+
+    def query(self, *args: Any) -> _FakeQuery:
+        self.query_calls.append(args)
+        return self._queries[len(self.query_calls) - 1]
+
+
+@pytest.mark.asyncio
+async def test_admin_usage_records_returns_model_version_without_request_metadata(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setattr("src.utils.cache_decorator.get_redis_client_sync", lambda: None)
+
+    usage = SimpleNamespace(
+        id="usage-1",
+        request_id=None,
+        user_id="user-1",
+        api_key_id=None,
+        provider_name="google",
+        provider_id=None,
+        provider_endpoint_id=None,
+        provider_api_key_id=None,
+        model="gemini-2.5-pro",
+        target_model=None,
+        input_tokens=120,
+        output_tokens=80,
+        cache_creation_input_tokens=0,
+        cache_read_input_tokens=0,
+        total_tokens=200,
+        total_cost_usd=Decimal("1.25"),
+        actual_total_cost_usd=Decimal("1.25"),
+        rate_multiplier=Decimal("1.0"),
+        response_time_ms=850,
+        first_byte_time_ms=230,
+        created_at=datetime(2026, 3, 9, 8, 30, tzinfo=timezone.utc),
+        is_stream=False,
+        status_code=200,
+        error_message=None,
+        status="completed",
+        api_format="gemini:chat",
+        endpoint_api_format=None,
+        has_format_conversion=False,
+        input_price_per_1m=Decimal("0.10"),
+        output_price_per_1m=Decimal("0.30"),
+        cache_creation_price_per_1m=None,
+        cache_read_price_per_1m=None,
+    )
+    user = SimpleNamespace(id="user-1", email="user@example.com", username="tester")
+
+    count_query = _FakeQuery(scalar_result=1)
+    data_query = _FakeQuery(
+        all_result=[
+            (usage, user, None, None, None, "gemini-2.5-pro-001"),
+        ]
+    )
+    db = _FakeDb([count_query, data_query])
+    context = SimpleNamespace(
+        db=db,
+        user=SimpleNamespace(id="admin-1"),
+        add_audit_metadata=lambda **_: None,
+    )
+
+    adapter = AdminUsageRecordsAdapter(
+        time_range=None,
+        search=None,
+        user_id=None,
+        username=None,
+        model=None,
+        provider=None,
+        api_format=None,
+        status=None,
+        limit=100,
+        offset=0,
+    )
+
+    result = await adapter.handle(context)
+
+    assert len(db.query_calls) == 2
+    assert len(db.query_calls[1]) == 6
+    assert getattr(db.query_calls[1][-1], "name", None) == "model_version"
+
+    record = result["records"][0]
+    assert record["model_version"] == "gemini-2.5-pro-001"
+    assert "request_metadata" not in record
+
+    usage_load_only = data_query.options_args[0]
+    usage_paths = {str(option.path) for option in usage_load_only.context}
+    assert "ORM Path[Mapper[Usage(usage)] -> Usage.request_metadata]" not in usage_paths