Merge pull request #1097 from Ethan0x0000/pr/upstream-model-tracking

feat(usage): 新增 upstream_model 追踪，支持按模型来源统计与展示

backend/internal/service/gateway_service.go

@@ -490,6 +490,7 @@ type ForwardResult struct {
 	RequestID        string
 	Usage            ClaudeUsage
 	Model            string
+	UpstreamModel    string // Actual upstream model after mapping (empty = no mapping)
 	Stream           bool
 	Duration         time.Duration
 	FirstTokenMs     *int // 首字时间（流式请求）
@@ -3988,7 +3989,13 @@ func (s *GatewayService) Forward(ctx context.Context, c *gin.Context, account *A
 				passthroughModel = mappedModel
 			}
 		}
-		return s.forwardAnthropicAPIKeyPassthrough(ctx, c, account, passthroughBody, passthroughModel, parsed.Stream, startTime)
+		return s.forwardAnthropicAPIKeyPassthroughWithInput(ctx, c, account, anthropicPassthroughForwardInput{
+			Body:          passthroughBody,
+			RequestModel:  passthroughModel,
+			OriginalModel: parsed.Model,
+			RequestStream: parsed.Stream,
+			StartTime:     startTime,
+		})
 	}
 
 	if account != nil && account.IsBedrock() {
@@ -4512,6 +4519,7 @@ func (s *GatewayService) Forward(ctx context.Context, c *gin.Context, account *A
 		RequestID:        resp.Header.Get("x-request-id"),
 		Usage:            *usage,
 		Model:            originalModel, // 使用原始模型用于计费和日志
+		UpstreamModel:    mappedModel,
 		Stream:           reqStream,
 		Duration:         time.Since(startTime),
 		FirstTokenMs:     firstTokenMs,
@@ -4519,14 +4527,38 @@ func (s *GatewayService) Forward(ctx context.Context, c *gin.Context, account *A
 	}, nil
 }
 
+type anthropicPassthroughForwardInput struct {
+	Body          []byte
+	RequestModel  string
+	OriginalModel string
+	RequestStream bool
+	StartTime     time.Time
+}
+
 func (s *GatewayService) forwardAnthropicAPIKeyPassthrough(
 	ctx context.Context,
 	c *gin.Context,
 	account *Account,
 	body []byte,
 	reqModel string,
+	originalModel string,
 	reqStream bool,
 	startTime time.Time,
+) (*ForwardResult, error) {
+	return s.forwardAnthropicAPIKeyPassthroughWithInput(ctx, c, account, anthropicPassthroughForwardInput{
+		Body:          body,
+		RequestModel:  reqModel,
+		OriginalModel: originalModel,
+		RequestStream: reqStream,
+		StartTime:     startTime,
+	})
+}
+
+func (s *GatewayService) forwardAnthropicAPIKeyPassthroughWithInput(
+	ctx context.Context,
+	c *gin.Context,
+	account *Account,
+	input anthropicPassthroughForwardInput,
 ) (*ForwardResult, error) {
 	token, tokenType, err := s.GetAccessToken(ctx, account)
 	if err != nil {
@@ -4542,19 +4574,19 @@ func (s *GatewayService) forwardAnthropicAPIKeyPassthrough(
 	}
 
 	logger.LegacyPrintf("service.gateway", "[Anthropic 自动透传] 命中 API Key 透传分支: account=%d name=%s model=%s stream=%v",
-		account.ID, account.Name, reqModel, reqStream)
+		account.ID, account.Name, input.RequestModel, input.RequestStream)
 
 	if c != nil {
 		c.Set("anthropic_passthrough", true)
 	}
 	// 重试间复用同一请求体，避免每次 string(body) 产生额外分配。
-	setOpsUpstreamRequestBody(c, body)
+	setOpsUpstreamRequestBody(c, input.Body)
 
 	var resp *http.Response
 	retryStart := time.Now()
 	for attempt := 1; attempt <= maxRetryAttempts; attempt++ {
-		upstreamCtx, releaseUpstreamCtx := detachStreamUpstreamContext(ctx, reqStream)
-		upstreamReq, err := s.buildUpstreamRequestAnthropicAPIKeyPassthrough(upstreamCtx, c, account, body, token)
+		upstreamCtx, releaseUpstreamCtx := detachStreamUpstreamContext(ctx, input.RequestStream)
+		upstreamReq, err := s.buildUpstreamRequestAnthropicAPIKeyPassthrough(upstreamCtx, c, account, input.Body, token)
 		releaseUpstreamCtx()
 		if err != nil {
 			return nil, err
@@ -4712,8 +4744,8 @@ func (s *GatewayService) forwardAnthropicAPIKeyPassthrough(
 	var usage *ClaudeUsage
 	var firstTokenMs *int
 	var clientDisconnect bool
-	if reqStream {
-		streamResult, err := s.handleStreamingResponseAnthropicAPIKeyPassthrough(ctx, resp, c, account, startTime, reqModel)
+	if input.RequestStream {
+		streamResult, err := s.handleStreamingResponseAnthropicAPIKeyPassthrough(ctx, resp, c, account, input.StartTime, input.RequestModel)
 		if err != nil {
 			return nil, err
 		}
@@ -4733,9 +4765,10 @@ func (s *GatewayService) forwardAnthropicAPIKeyPassthrough(
 	return &ForwardResult{
 		RequestID:        resp.Header.Get("x-request-id"),
 		Usage:            *usage,
-		Model:            reqModel,
-		Stream:           reqStream,
-		Duration:         time.Since(startTime),
+		Model:            input.OriginalModel,
+		UpstreamModel:    input.RequestModel,
+		Stream:           input.RequestStream,
+		Duration:         time.Since(input.StartTime),
 		FirstTokenMs:     firstTokenMs,
 		ClientDisconnect: clientDisconnect,
 	}, nil
@@ -5240,6 +5273,7 @@ func (s *GatewayService) forwardBedrock(
 		RequestID:        resp.Header.Get("x-amzn-requestid"),
 		Usage:            *usage,
 		Model:            reqModel,
+		UpstreamModel:    mappedModel,
 		Stream:           reqStream,
 		Duration:         time.Since(startTime),
 		FirstTokenMs:     firstTokenMs,
@@ -7530,6 +7564,7 @@ func (s *GatewayService) RecordUsage(ctx context.Context, input *RecordUsageInpu
 		AccountID:             account.ID,
 		RequestID:             requestID,
 		Model:                 result.Model,
+		UpstreamModel:         optionalNonEqualStringPtr(result.UpstreamModel, result.Model),
 		ReasoningEffort:       result.ReasoningEffort,
 		InboundEndpoint:       optionalTrimmedStringPtr(input.InboundEndpoint),
 		UpstreamEndpoint:      optionalTrimmedStringPtr(input.UpstreamEndpoint),
@@ -7711,6 +7746,7 @@ func (s *GatewayService) RecordUsageWithLongContext(ctx context.Context, input *
 		AccountID:             account.ID,
 		RequestID:             requestID,
 		Model:                 result.Model,
+		UpstreamModel:         optionalNonEqualStringPtr(result.UpstreamModel, result.Model),
 		ReasoningEffort:       result.ReasoningEffort,
 		InboundEndpoint:       optionalTrimmedStringPtr(input.InboundEndpoint),
 		UpstreamEndpoint:      optionalTrimmedStringPtr(input.UpstreamEndpoint),