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
2026-04-03 06:52:13 +08:00 · 2026-03-18 15:36:00 +08:00
parent 1292c44b41 cfaac12af1
commit 241023f3fc
42 changed files with 932 additions and 170 deletions
--- a/backend/ent/migrate/schema.go
+++ b/backend/ent/migrate/schema.go
@@ -716,6 +716,7 @@ var (
 		{Name: "id", Type: field.TypeInt64, Increment: true},
 		{Name: "request_id", Type: field.TypeString, Size: 64},
 		{Name: "model", Type: field.TypeString, Size: 100},
+		{Name: "upstream_model", Type: field.TypeString, Nullable: true, Size: 100},
 		{Name: "input_tokens", Type: field.TypeInt, Default: 0},
 		{Name: "output_tokens", Type: field.TypeInt, Default: 0},
 		{Name: "cache_creation_tokens", Type: field.TypeInt, Default: 0},
@@ -755,31 +756,31 @@ var (
 		ForeignKeys: []*schema.ForeignKey{
 			{
 				Symbol:     "usage_logs_api_keys_usage_logs",
-				Columns:    []*schema.Column{UsageLogsColumns[28]},
+				Columns:    []*schema.Column{UsageLogsColumns[29]},
 				RefColumns: []*schema.Column{APIKeysColumns[0]},
 				OnDelete:   schema.NoAction,
 			},
 			{
 				Symbol:     "usage_logs_accounts_usage_logs",
-				Columns:    []*schema.Column{UsageLogsColumns[29]},
+				Columns:    []*schema.Column{UsageLogsColumns[30]},
 				RefColumns: []*schema.Column{AccountsColumns[0]},
 				OnDelete:   schema.NoAction,
 			},
 			{
 				Symbol:     "usage_logs_groups_usage_logs",
-				Columns:    []*schema.Column{UsageLogsColumns[30]},
+				Columns:    []*schema.Column{UsageLogsColumns[31]},
 				RefColumns: []*schema.Column{GroupsColumns[0]},
 				OnDelete:   schema.SetNull,
 			},
 			{
 				Symbol:     "usage_logs_users_usage_logs",
-				Columns:    []*schema.Column{UsageLogsColumns[31]},
+				Columns:    []*schema.Column{UsageLogsColumns[32]},
 				RefColumns: []*schema.Column{UsersColumns[0]},
 				OnDelete:   schema.NoAction,
 			},
 			{
 				Symbol:     "usage_logs_user_subscriptions_usage_logs",
-				Columns:    []*schema.Column{UsageLogsColumns[32]},
+				Columns:    []*schema.Column{UsageLogsColumns[33]},
 				RefColumns: []*schema.Column{UserSubscriptionsColumns[0]},
 				OnDelete:   schema.SetNull,
 			},
@@ -788,32 +789,32 @@ var (
 			{
 				Name:    "usagelog_user_id",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[31]},
+				Columns: []*schema.Column{UsageLogsColumns[32]},
 			},
 			{
 				Name:    "usagelog_api_key_id",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[28]},
+				Columns: []*schema.Column{UsageLogsColumns[29]},
 			},
 			{
 				Name:    "usagelog_account_id",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[29]},
+				Columns: []*schema.Column{UsageLogsColumns[30]},
 			},
 			{
 				Name:    "usagelog_group_id",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[30]},
+				Columns: []*schema.Column{UsageLogsColumns[31]},
 			},
 			{
 				Name:    "usagelog_subscription_id",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[32]},
+				Columns: []*schema.Column{UsageLogsColumns[33]},
 			},
 			{
 				Name:    "usagelog_created_at",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[27]},
+				Columns: []*schema.Column{UsageLogsColumns[28]},
 			},
 			{
 				Name:    "usagelog_model",
@@ -828,17 +829,17 @@ var (
 			{
 				Name:    "usagelog_user_id_created_at",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[31], UsageLogsColumns[27]},
+				Columns: []*schema.Column{UsageLogsColumns[32], UsageLogsColumns[28]},
 			},
 			{
 				Name:    "usagelog_api_key_id_created_at",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[28], UsageLogsColumns[27]},
+				Columns: []*schema.Column{UsageLogsColumns[29], UsageLogsColumns[28]},
 			},
 			{
 				Name:    "usagelog_group_id_created_at",
 				Unique:  false,
-				Columns: []*schema.Column{UsageLogsColumns[30], UsageLogsColumns[27]},
+				Columns: []*schema.Column{UsageLogsColumns[31], UsageLogsColumns[28]},
 			},
 		},
 	}
--- a/backend/ent/mutation.go
+++ b/backend/ent/mutation.go
@@ -18239,6 +18239,7 @@ type UsageLogMutation struct {
 	id                          *int64
 	request_id                  *string
 	model                       *string
+	upstream_model              *string
 	input_tokens                *int
 	addinput_tokens             *int
 	output_tokens               *int
@@ -18576,6 +18577,55 @@ func (m *UsageLogMutation) ResetModel() {
 	m.model = nil
 }

+// SetUpstreamModel sets the "upstream_model" field.
+func (m *UsageLogMutation) SetUpstreamModel(s string) {
+	m.upstream_model = &s
+}
+
+// UpstreamModel returns the value of the "upstream_model" field in the mutation.
+func (m *UsageLogMutation) UpstreamModel() (r string, exists bool) {
+	v := m.upstream_model
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldUpstreamModel returns the old "upstream_model" field's value of the UsageLog entity.
+// If the UsageLog object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *UsageLogMutation) OldUpstreamModel(ctx context.Context) (v *string, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldUpstreamModel is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldUpstreamModel requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldUpstreamModel: %w", err)
+	}
+	return oldValue.UpstreamModel, nil
+}
+
+// ClearUpstreamModel clears the value of the "upstream_model" field.
+func (m *UsageLogMutation) ClearUpstreamModel() {
+	m.upstream_model = nil
+	m.clearedFields[usagelog.FieldUpstreamModel] = struct{}{}
+}
+
+// UpstreamModelCleared returns if the "upstream_model" field was cleared in this mutation.
+func (m *UsageLogMutation) UpstreamModelCleared() bool {
+	_, ok := m.clearedFields[usagelog.FieldUpstreamModel]
+	return ok
+}
+
+// ResetUpstreamModel resets all changes to the "upstream_model" field.
+func (m *UsageLogMutation) ResetUpstreamModel() {
+	m.upstream_model = nil
+	delete(m.clearedFields, usagelog.FieldUpstreamModel)
+}
+
 // SetGroupID sets the "group_id" field.
 func (m *UsageLogMutation) SetGroupID(i int64) {
 	m.group = &i
@@ -20197,7 +20247,7 @@ func (m *UsageLogMutation) Type() string {
 // order to get all numeric fields that were incremented/decremented, call
 // AddedFields().
 func (m *UsageLogMutation) Fields() []string {
-	fields := make([]string, 0, 32)
+	fields := make([]string, 0, 33)
 	if m.user != nil {
 		fields = append(fields, usagelog.FieldUserID)
 	}
@@ -20213,6 +20263,9 @@ func (m *UsageLogMutation) Fields() []string {
 	if m.model != nil {
 		fields = append(fields, usagelog.FieldModel)
 	}
+	if m.upstream_model != nil {
+		fields = append(fields, usagelog.FieldUpstreamModel)
+	}
 	if m.group != nil {
 		fields = append(fields, usagelog.FieldGroupID)
 	}
@@ -20312,6 +20365,8 @@ func (m *UsageLogMutation) Field(name string) (ent.Value, bool) {
 		return m.RequestID()
 	case usagelog.FieldModel:
 		return m.Model()
+	case usagelog.FieldUpstreamModel:
+		return m.UpstreamModel()
 	case usagelog.FieldGroupID:
 		return m.GroupID()
 	case usagelog.FieldSubscriptionID:
@@ -20385,6 +20440,8 @@ func (m *UsageLogMutation) OldField(ctx context.Context, name string) (ent.Value
 		return m.OldRequestID(ctx)
 	case usagelog.FieldModel:
 		return m.OldModel(ctx)
+	case usagelog.FieldUpstreamModel:
+		return m.OldUpstreamModel(ctx)
 	case usagelog.FieldGroupID:
 		return m.OldGroupID(ctx)
 	case usagelog.FieldSubscriptionID:
@@ -20483,6 +20540,13 @@ func (m *UsageLogMutation) SetField(name string, value ent.Value) error {
 		}
 		m.SetModel(v)
 		return nil
+	case usagelog.FieldUpstreamModel:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetUpstreamModel(v)
+		return nil
 	case usagelog.FieldGroupID:
 		v, ok := value.(int64)
 		if !ok {
@@ -20921,6 +20985,9 @@ func (m *UsageLogMutation) AddField(name string, value ent.Value) error {
 // mutation.
 func (m *UsageLogMutation) ClearedFields() []string {
 	var fields []string
+	if m.FieldCleared(usagelog.FieldUpstreamModel) {
+		fields = append(fields, usagelog.FieldUpstreamModel)
+	}
 	if m.FieldCleared(usagelog.FieldGroupID) {
 		fields = append(fields, usagelog.FieldGroupID)
 	}
@@ -20962,6 +21029,9 @@ func (m *UsageLogMutation) FieldCleared(name string) bool {
 // error if the field is not defined in the schema.
 func (m *UsageLogMutation) ClearField(name string) error {
 	switch name {
+	case usagelog.FieldUpstreamModel:
+		m.ClearUpstreamModel()
+		return nil
 	case usagelog.FieldGroupID:
 		m.ClearGroupID()
 		return nil
@@ -21012,6 +21082,9 @@ func (m *UsageLogMutation) ResetField(name string) error {
 	case usagelog.FieldModel:
 		m.ResetModel()
 		return nil
+	case usagelog.FieldUpstreamModel:
+		m.ResetUpstreamModel()
+		return nil
 	case usagelog.FieldGroupID:
 		m.ResetGroupID()
 		return nil
--- a/backend/ent/runtime/runtime.go
+++ b/backend/ent/runtime/runtime.go
@@ -821,92 +821,96 @@ func init() {
 			return nil
 		}
 	}()
+	// usagelogDescUpstreamModel is the schema descriptor for upstream_model field.
+	usagelogDescUpstreamModel := usagelogFields[5].Descriptor()
+	// usagelog.UpstreamModelValidator is a validator for the "upstream_model" field. It is called by the builders before save.
+	usagelog.UpstreamModelValidator = usagelogDescUpstreamModel.Validators[0].(func(string) error)
 	// usagelogDescInputTokens is the schema descriptor for input_tokens field.
-	usagelogDescInputTokens := usagelogFields[7].Descriptor()
+	usagelogDescInputTokens := usagelogFields[8].Descriptor()
 	// usagelog.DefaultInputTokens holds the default value on creation for the input_tokens field.
 	usagelog.DefaultInputTokens = usagelogDescInputTokens.Default.(int)
 	// usagelogDescOutputTokens is the schema descriptor for output_tokens field.
-	usagelogDescOutputTokens := usagelogFields[8].Descriptor()
+	usagelogDescOutputTokens := usagelogFields[9].Descriptor()
 	// usagelog.DefaultOutputTokens holds the default value on creation for the output_tokens field.
 	usagelog.DefaultOutputTokens = usagelogDescOutputTokens.Default.(int)
 	// usagelogDescCacheCreationTokens is the schema descriptor for cache_creation_tokens field.
-	usagelogDescCacheCreationTokens := usagelogFields[9].Descriptor()
+	usagelogDescCacheCreationTokens := usagelogFields[10].Descriptor()
 	// usagelog.DefaultCacheCreationTokens holds the default value on creation for the cache_creation_tokens field.
 	usagelog.DefaultCacheCreationTokens = usagelogDescCacheCreationTokens.Default.(int)
 	// usagelogDescCacheReadTokens is the schema descriptor for cache_read_tokens field.
-	usagelogDescCacheReadTokens := usagelogFields[10].Descriptor()
+	usagelogDescCacheReadTokens := usagelogFields[11].Descriptor()
 	// usagelog.DefaultCacheReadTokens holds the default value on creation for the cache_read_tokens field.
 	usagelog.DefaultCacheReadTokens = usagelogDescCacheReadTokens.Default.(int)
 	// usagelogDescCacheCreation5mTokens is the schema descriptor for cache_creation_5m_tokens field.
-	usagelogDescCacheCreation5mTokens := usagelogFields[11].Descriptor()
+	usagelogDescCacheCreation5mTokens := usagelogFields[12].Descriptor()
 	// usagelog.DefaultCacheCreation5mTokens holds the default value on creation for the cache_creation_5m_tokens field.
 	usagelog.DefaultCacheCreation5mTokens = usagelogDescCacheCreation5mTokens.Default.(int)
 	// usagelogDescCacheCreation1hTokens is the schema descriptor for cache_creation_1h_tokens field.
-	usagelogDescCacheCreation1hTokens := usagelogFields[12].Descriptor()
+	usagelogDescCacheCreation1hTokens := usagelogFields[13].Descriptor()
 	// usagelog.DefaultCacheCreation1hTokens holds the default value on creation for the cache_creation_1h_tokens field.
 	usagelog.DefaultCacheCreation1hTokens = usagelogDescCacheCreation1hTokens.Default.(int)
 	// usagelogDescInputCost is the schema descriptor for input_cost field.
-	usagelogDescInputCost := usagelogFields[13].Descriptor()
+	usagelogDescInputCost := usagelogFields[14].Descriptor()
 	// usagelog.DefaultInputCost holds the default value on creation for the input_cost field.
 	usagelog.DefaultInputCost = usagelogDescInputCost.Default.(float64)
 	// usagelogDescOutputCost is the schema descriptor for output_cost field.
-	usagelogDescOutputCost := usagelogFields[14].Descriptor()
+	usagelogDescOutputCost := usagelogFields[15].Descriptor()
 	// usagelog.DefaultOutputCost holds the default value on creation for the output_cost field.
 	usagelog.DefaultOutputCost = usagelogDescOutputCost.Default.(float64)
 	// usagelogDescCacheCreationCost is the schema descriptor for cache_creation_cost field.
-	usagelogDescCacheCreationCost := usagelogFields[15].Descriptor()
+	usagelogDescCacheCreationCost := usagelogFields[16].Descriptor()
 	// usagelog.DefaultCacheCreationCost holds the default value on creation for the cache_creation_cost field.
 	usagelog.DefaultCacheCreationCost = usagelogDescCacheCreationCost.Default.(float64)
 	// usagelogDescCacheReadCost is the schema descriptor for cache_read_cost field.
-	usagelogDescCacheReadCost := usagelogFields[16].Descriptor()
+	usagelogDescCacheReadCost := usagelogFields[17].Descriptor()
 	// usagelog.DefaultCacheReadCost holds the default value on creation for the cache_read_cost field.
 	usagelog.DefaultCacheReadCost = usagelogDescCacheReadCost.Default.(float64)
 	// usagelogDescTotalCost is the schema descriptor for total_cost field.
-	usagelogDescTotalCost := usagelogFields[17].Descriptor()
+	usagelogDescTotalCost := usagelogFields[18].Descriptor()
 	// usagelog.DefaultTotalCost holds the default value on creation for the total_cost field.
 	usagelog.DefaultTotalCost = usagelogDescTotalCost.Default.(float64)
 	// usagelogDescActualCost is the schema descriptor for actual_cost field.
-	usagelogDescActualCost := usagelogFields[18].Descriptor()
+	usagelogDescActualCost := usagelogFields[19].Descriptor()
 	// usagelog.DefaultActualCost holds the default value on creation for the actual_cost field.
 	usagelog.DefaultActualCost = usagelogDescActualCost.Default.(float64)
 	// usagelogDescRateMultiplier is the schema descriptor for rate_multiplier field.
-	usagelogDescRateMultiplier := usagelogFields[19].Descriptor()
+	usagelogDescRateMultiplier := usagelogFields[20].Descriptor()
 	// usagelog.DefaultRateMultiplier holds the default value on creation for the rate_multiplier field.
 	usagelog.DefaultRateMultiplier = usagelogDescRateMultiplier.Default.(float64)
 	// usagelogDescBillingType is the schema descriptor for billing_type field.
-	usagelogDescBillingType := usagelogFields[21].Descriptor()
+	usagelogDescBillingType := usagelogFields[22].Descriptor()
 	// usagelog.DefaultBillingType holds the default value on creation for the billing_type field.
 	usagelog.DefaultBillingType = usagelogDescBillingType.Default.(int8)
 	// usagelogDescStream is the schema descriptor for stream field.
-	usagelogDescStream := usagelogFields[22].Descriptor()
+	usagelogDescStream := usagelogFields[23].Descriptor()
 	// usagelog.DefaultStream holds the default value on creation for the stream field.
 	usagelog.DefaultStream = usagelogDescStream.Default.(bool)
 	// usagelogDescUserAgent is the schema descriptor for user_agent field.
-	usagelogDescUserAgent := usagelogFields[25].Descriptor()
+	usagelogDescUserAgent := usagelogFields[26].Descriptor()
 	// usagelog.UserAgentValidator is a validator for the "user_agent" field. It is called by the builders before save.
 	usagelog.UserAgentValidator = usagelogDescUserAgent.Validators[0].(func(string) error)
 	// usagelogDescIPAddress is the schema descriptor for ip_address field.
-	usagelogDescIPAddress := usagelogFields[26].Descriptor()
+	usagelogDescIPAddress := usagelogFields[27].Descriptor()
 	// usagelog.IPAddressValidator is a validator for the "ip_address" field. It is called by the builders before save.
 	usagelog.IPAddressValidator = usagelogDescIPAddress.Validators[0].(func(string) error)
 	// usagelogDescImageCount is the schema descriptor for image_count field.
-	usagelogDescImageCount := usagelogFields[27].Descriptor()
+	usagelogDescImageCount := usagelogFields[28].Descriptor()
 	// usagelog.DefaultImageCount holds the default value on creation for the image_count field.
 	usagelog.DefaultImageCount = usagelogDescImageCount.Default.(int)
 	// usagelogDescImageSize is the schema descriptor for image_size field.
-	usagelogDescImageSize := usagelogFields[28].Descriptor()
+	usagelogDescImageSize := usagelogFields[29].Descriptor()
 	// usagelog.ImageSizeValidator is a validator for the "image_size" field. It is called by the builders before save.
 	usagelog.ImageSizeValidator = usagelogDescImageSize.Validators[0].(func(string) error)
 	// usagelogDescMediaType is the schema descriptor for media_type field.
-	usagelogDescMediaType := usagelogFields[29].Descriptor()
+	usagelogDescMediaType := usagelogFields[30].Descriptor()
 	// usagelog.MediaTypeValidator is a validator for the "media_type" field. It is called by the builders before save.
 	usagelog.MediaTypeValidator = usagelogDescMediaType.Validators[0].(func(string) error)
 	// usagelogDescCacheTTLOverridden is the schema descriptor for cache_ttl_overridden field.
-	usagelogDescCacheTTLOverridden := usagelogFields[30].Descriptor()
+	usagelogDescCacheTTLOverridden := usagelogFields[31].Descriptor()
 	// usagelog.DefaultCacheTTLOverridden holds the default value on creation for the cache_ttl_overridden field.
 	usagelog.DefaultCacheTTLOverridden = usagelogDescCacheTTLOverridden.Default.(bool)
 	// usagelogDescCreatedAt is the schema descriptor for created_at field.
-	usagelogDescCreatedAt := usagelogFields[31].Descriptor()
+	usagelogDescCreatedAt := usagelogFields[32].Descriptor()
 	// usagelog.DefaultCreatedAt holds the default value on creation for the created_at field.
 	usagelog.DefaultCreatedAt = usagelogDescCreatedAt.Default.(func() time.Time)
 	userMixin := schema.User{}.Mixin()
--- a/backend/ent/schema/usage_log.go
+++ b/backend/ent/schema/usage_log.go
@@ -41,6 +41,12 @@ func (UsageLog) Fields() []ent.Field {
 		field.String("model").
 			MaxLen(100).
 			NotEmpty(),
+		// UpstreamModel stores the actual upstream model name when model mapping
+		// is applied. NULL means no mapping — the requested model was used as-is.
+		field.String("upstream_model").
+			MaxLen(100).
+			Optional().
+			Nillable(),
 		field.Int64("group_id").
 			Optional().
 			Nillable(),
--- a/backend/ent/usagelog.go
+++ b/backend/ent/usagelog.go
@@ -32,6 +32,8 @@ type UsageLog struct {
 	RequestID string `json:"request_id,omitempty"`
 	// Model holds the value of the "model" field.
 	Model string `json:"model,omitempty"`
+	// UpstreamModel holds the value of the "upstream_model" field.
+	UpstreamModel *string `json:"upstream_model,omitempty"`
 	// GroupID holds the value of the "group_id" field.
 	GroupID *int64 `json:"group_id,omitempty"`
 	// SubscriptionID holds the value of the "subscription_id" field.
@@ -175,7 +177,7 @@ func (*UsageLog) scanValues(columns []string) ([]any, error) {
 			values[i] = new(sql.NullFloat64)
 		case usagelog.FieldID, usagelog.FieldUserID, usagelog.FieldAPIKeyID, usagelog.FieldAccountID, usagelog.FieldGroupID, usagelog.FieldSubscriptionID, usagelog.FieldInputTokens, usagelog.FieldOutputTokens, usagelog.FieldCacheCreationTokens, usagelog.FieldCacheReadTokens, usagelog.FieldCacheCreation5mTokens, usagelog.FieldCacheCreation1hTokens, usagelog.FieldBillingType, usagelog.FieldDurationMs, usagelog.FieldFirstTokenMs, usagelog.FieldImageCount:
 			values[i] = new(sql.NullInt64)
-		case usagelog.FieldRequestID, usagelog.FieldModel, usagelog.FieldUserAgent, usagelog.FieldIPAddress, usagelog.FieldImageSize, usagelog.FieldMediaType:
+		case usagelog.FieldRequestID, usagelog.FieldModel, usagelog.FieldUpstreamModel, usagelog.FieldUserAgent, usagelog.FieldIPAddress, usagelog.FieldImageSize, usagelog.FieldMediaType:
 			values[i] = new(sql.NullString)
 		case usagelog.FieldCreatedAt:
 			values[i] = new(sql.NullTime)
@@ -230,6 +232,13 @@ func (_m *UsageLog) assignValues(columns []string, values []any) error {
 			} else if value.Valid {
 				_m.Model = value.String
 			}
+		case usagelog.FieldUpstreamModel:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field upstream_model", values[i])
+			} else if value.Valid {
+				_m.UpstreamModel = new(string)
+				*_m.UpstreamModel = value.String
+			}
 		case usagelog.FieldGroupID:
 			if value, ok := values[i].(*sql.NullInt64); !ok {
 				return fmt.Errorf("unexpected type %T for field group_id", values[i])
@@ -477,6 +486,11 @@ func (_m *UsageLog) String() string {
 	builder.WriteString("model=")
 	builder.WriteString(_m.Model)
 	builder.WriteString(", ")
+	if v := _m.UpstreamModel; v != nil {
+		builder.WriteString("upstream_model=")
+		builder.WriteString(*v)
+	}
+	builder.WriteString(", ")
 	if v := _m.GroupID; v != nil {
 		builder.WriteString("group_id=")
 		builder.WriteString(fmt.Sprintf("%v", *v))
--- a/backend/ent/usagelog/usagelog.go
+++ b/backend/ent/usagelog/usagelog.go
@@ -24,6 +24,8 @@ const (
 	FieldRequestID = "request_id"
 	// FieldModel holds the string denoting the model field in the database.
 	FieldModel = "model"
+	// FieldUpstreamModel holds the string denoting the upstream_model field in the database.
+	FieldUpstreamModel = "upstream_model"
 	// FieldGroupID holds the string denoting the group_id field in the database.
 	FieldGroupID = "group_id"
 	// FieldSubscriptionID holds the string denoting the subscription_id field in the database.
@@ -135,6 +137,7 @@ var Columns = []string{
 	FieldAccountID,
 	FieldRequestID,
 	FieldModel,
+	FieldUpstreamModel,
 	FieldGroupID,
 	FieldSubscriptionID,
 	FieldInputTokens,
@@ -179,6 +182,8 @@ var (
 	RequestIDValidator func(string) error
 	// ModelValidator is a validator for the "model" field. It is called by the builders before save.
 	ModelValidator func(string) error
+	// UpstreamModelValidator is a validator for the "upstream_model" field. It is called by the builders before save.
+	UpstreamModelValidator func(string) error
 	// DefaultInputTokens holds the default value on creation for the "input_tokens" field.
 	DefaultInputTokens int
 	// DefaultOutputTokens holds the default value on creation for the "output_tokens" field.
@@ -258,6 +263,11 @@ func ByModel(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldModel, opts...).ToFunc()
 }

+// ByUpstreamModel orders the results by the upstream_model field.
+func ByUpstreamModel(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldUpstreamModel, opts...).ToFunc()
+}
+
 // ByGroupID orders the results by the group_id field.
 func ByGroupID(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldGroupID, opts...).ToFunc()
--- a/backend/ent/usagelog/where.go
+++ b/backend/ent/usagelog/where.go
@@ -80,6 +80,11 @@ func Model(v string) predicate.UsageLog {
 	return predicate.UsageLog(sql.FieldEQ(FieldModel, v))
 }

+// UpstreamModel applies equality check predicate on the "upstream_model" field. It's identical to UpstreamModelEQ.
+func UpstreamModel(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldEQ(FieldUpstreamModel, v))
+}
+
 // GroupID applies equality check predicate on the "group_id" field. It's identical to GroupIDEQ.
 func GroupID(v int64) predicate.UsageLog {
 	return predicate.UsageLog(sql.FieldEQ(FieldGroupID, v))
@@ -405,6 +410,81 @@ func ModelContainsFold(v string) predicate.UsageLog {
 	return predicate.UsageLog(sql.FieldContainsFold(FieldModel, v))
 }

+// UpstreamModelEQ applies the EQ predicate on the "upstream_model" field.
+func UpstreamModelEQ(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldEQ(FieldUpstreamModel, v))
+}
+
+// UpstreamModelNEQ applies the NEQ predicate on the "upstream_model" field.
+func UpstreamModelNEQ(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldNEQ(FieldUpstreamModel, v))
+}
+
+// UpstreamModelIn applies the In predicate on the "upstream_model" field.
+func UpstreamModelIn(vs ...string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldIn(FieldUpstreamModel, vs...))
+}
+
+// UpstreamModelNotIn applies the NotIn predicate on the "upstream_model" field.
+func UpstreamModelNotIn(vs ...string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldNotIn(FieldUpstreamModel, vs...))
+}
+
+// UpstreamModelGT applies the GT predicate on the "upstream_model" field.
+func UpstreamModelGT(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldGT(FieldUpstreamModel, v))
+}
+
+// UpstreamModelGTE applies the GTE predicate on the "upstream_model" field.
+func UpstreamModelGTE(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldGTE(FieldUpstreamModel, v))
+}
+
+// UpstreamModelLT applies the LT predicate on the "upstream_model" field.
+func UpstreamModelLT(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldLT(FieldUpstreamModel, v))
+}
+
+// UpstreamModelLTE applies the LTE predicate on the "upstream_model" field.
+func UpstreamModelLTE(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldLTE(FieldUpstreamModel, v))
+}
+
+// UpstreamModelContains applies the Contains predicate on the "upstream_model" field.
+func UpstreamModelContains(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldContains(FieldUpstreamModel, v))
+}
+
+// UpstreamModelHasPrefix applies the HasPrefix predicate on the "upstream_model" field.
+func UpstreamModelHasPrefix(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldHasPrefix(FieldUpstreamModel, v))
+}
+
+// UpstreamModelHasSuffix applies the HasSuffix predicate on the "upstream_model" field.
+func UpstreamModelHasSuffix(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldHasSuffix(FieldUpstreamModel, v))
+}
+
+// UpstreamModelIsNil applies the IsNil predicate on the "upstream_model" field.
+func UpstreamModelIsNil() predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldIsNull(FieldUpstreamModel))
+}
+
+// UpstreamModelNotNil applies the NotNil predicate on the "upstream_model" field.
+func UpstreamModelNotNil() predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldNotNull(FieldUpstreamModel))
+}
+
+// UpstreamModelEqualFold applies the EqualFold predicate on the "upstream_model" field.
+func UpstreamModelEqualFold(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldEqualFold(FieldUpstreamModel, v))
+}
+
+// UpstreamModelContainsFold applies the ContainsFold predicate on the "upstream_model" field.
+func UpstreamModelContainsFold(v string) predicate.UsageLog {
+	return predicate.UsageLog(sql.FieldContainsFold(FieldUpstreamModel, v))
+}
+
 // GroupIDEQ applies the EQ predicate on the "group_id" field.
 func GroupIDEQ(v int64) predicate.UsageLog {
 	return predicate.UsageLog(sql.FieldEQ(FieldGroupID, v))
--- a/backend/ent/usagelog_create.go
+++ b/backend/ent/usagelog_create.go
@@ -57,6 +57,20 @@ func (_c *UsageLogCreate) SetModel(v string) *UsageLogCreate {
 	return _c
 }

+// SetUpstreamModel sets the "upstream_model" field.
+func (_c *UsageLogCreate) SetUpstreamModel(v string) *UsageLogCreate {
+	_c.mutation.SetUpstreamModel(v)
+	return _c
+}
+
+// SetNillableUpstreamModel sets the "upstream_model" field if the given value is not nil.
+func (_c *UsageLogCreate) SetNillableUpstreamModel(v *string) *UsageLogCreate {
+	if v != nil {
+		_c.SetUpstreamModel(*v)
+	}
+	return _c
+}
+
 // SetGroupID sets the "group_id" field.
 func (_c *UsageLogCreate) SetGroupID(v int64) *UsageLogCreate {
 	_c.mutation.SetGroupID(v)
@@ -596,6 +610,11 @@ func (_c *UsageLogCreate) check() error {
 			return &ValidationError{Name: "model", err: fmt.Errorf(`ent: validator failed for field "UsageLog.model": %w`, err)}
 		}
 	}
+	if v, ok := _c.mutation.UpstreamModel(); ok {
+		if err := usagelog.UpstreamModelValidator(v); err != nil {
+			return &ValidationError{Name: "upstream_model", err: fmt.Errorf(`ent: validator failed for field "UsageLog.upstream_model": %w`, err)}
+		}
+	}
 	if _, ok := _c.mutation.InputTokens(); !ok {
 		return &ValidationError{Name: "input_tokens", err: errors.New(`ent: missing required field "UsageLog.input_tokens"`)}
 	}
@@ -714,6 +733,10 @@ func (_c *UsageLogCreate) createSpec() (*UsageLog, *sqlgraph.CreateSpec) {
 		_spec.SetField(usagelog.FieldModel, field.TypeString, value)
 		_node.Model = value
 	}
+	if value, ok := _c.mutation.UpstreamModel(); ok {
+		_spec.SetField(usagelog.FieldUpstreamModel, field.TypeString, value)
+		_node.UpstreamModel = &value
+	}
 	if value, ok := _c.mutation.InputTokens(); ok {
 		_spec.SetField(usagelog.FieldInputTokens, field.TypeInt, value)
 		_node.InputTokens = value
@@ -1011,6 +1034,24 @@ func (u *UsageLogUpsert) UpdateModel() *UsageLogUpsert {
 	return u
 }

+// SetUpstreamModel sets the "upstream_model" field.
+func (u *UsageLogUpsert) SetUpstreamModel(v string) *UsageLogUpsert {
+	u.Set(usagelog.FieldUpstreamModel, v)
+	return u
+}
+
+// UpdateUpstreamModel sets the "upstream_model" field to the value that was provided on create.
+func (u *UsageLogUpsert) UpdateUpstreamModel() *UsageLogUpsert {
+	u.SetExcluded(usagelog.FieldUpstreamModel)
+	return u
+}
+
+// ClearUpstreamModel clears the value of the "upstream_model" field.
+func (u *UsageLogUpsert) ClearUpstreamModel() *UsageLogUpsert {
+	u.SetNull(usagelog.FieldUpstreamModel)
+	return u
+}
+
 // SetGroupID sets the "group_id" field.
 func (u *UsageLogUpsert) SetGroupID(v int64) *UsageLogUpsert {
 	u.Set(usagelog.FieldGroupID, v)
@@ -1600,6 +1641,27 @@ func (u *UsageLogUpsertOne) UpdateModel() *UsageLogUpsertOne {
 	})
 }

+// SetUpstreamModel sets the "upstream_model" field.
+func (u *UsageLogUpsertOne) SetUpstreamModel(v string) *UsageLogUpsertOne {
+	return u.Update(func(s *UsageLogUpsert) {
+		s.SetUpstreamModel(v)
+	})
+}
+
+// UpdateUpstreamModel sets the "upstream_model" field to the value that was provided on create.
+func (u *UsageLogUpsertOne) UpdateUpstreamModel() *UsageLogUpsertOne {
+	return u.Update(func(s *UsageLogUpsert) {
+		s.UpdateUpstreamModel()
+	})
+}
+
+// ClearUpstreamModel clears the value of the "upstream_model" field.
+func (u *UsageLogUpsertOne) ClearUpstreamModel() *UsageLogUpsertOne {
+	return u.Update(func(s *UsageLogUpsert) {
+		s.ClearUpstreamModel()
+	})
+}
+
 // SetGroupID sets the "group_id" field.
 func (u *UsageLogUpsertOne) SetGroupID(v int64) *UsageLogUpsertOne {
 	return u.Update(func(s *UsageLogUpsert) {
@@ -2434,6 +2496,27 @@ func (u *UsageLogUpsertBulk) UpdateModel() *UsageLogUpsertBulk {
 	})
 }

+// SetUpstreamModel sets the "upstream_model" field.
+func (u *UsageLogUpsertBulk) SetUpstreamModel(v string) *UsageLogUpsertBulk {
+	return u.Update(func(s *UsageLogUpsert) {
+		s.SetUpstreamModel(v)
+	})
+}
+
+// UpdateUpstreamModel sets the "upstream_model" field to the value that was provided on create.
+func (u *UsageLogUpsertBulk) UpdateUpstreamModel() *UsageLogUpsertBulk {
+	return u.Update(func(s *UsageLogUpsert) {
+		s.UpdateUpstreamModel()
+	})
+}
+
+// ClearUpstreamModel clears the value of the "upstream_model" field.
+func (u *UsageLogUpsertBulk) ClearUpstreamModel() *UsageLogUpsertBulk {
+	return u.Update(func(s *UsageLogUpsert) {
+		s.ClearUpstreamModel()
+	})
+}
+
 // SetGroupID sets the "group_id" field.
 func (u *UsageLogUpsertBulk) SetGroupID(v int64) *UsageLogUpsertBulk {
 	return u.Update(func(s *UsageLogUpsert) {
--- a/backend/ent/usagelog_update.go
+++ b/backend/ent/usagelog_update.go
@@ -102,6 +102,26 @@ func (_u *UsageLogUpdate) SetNillableModel(v *string) *UsageLogUpdate {
 	return _u
 }

+// SetUpstreamModel sets the "upstream_model" field.
+func (_u *UsageLogUpdate) SetUpstreamModel(v string) *UsageLogUpdate {
+	_u.mutation.SetUpstreamModel(v)
+	return _u
+}
+
+// SetNillableUpstreamModel sets the "upstream_model" field if the given value is not nil.
+func (_u *UsageLogUpdate) SetNillableUpstreamModel(v *string) *UsageLogUpdate {
+	if v != nil {
+		_u.SetUpstreamModel(*v)
+	}
+	return _u
+}
+
+// ClearUpstreamModel clears the value of the "upstream_model" field.
+func (_u *UsageLogUpdate) ClearUpstreamModel() *UsageLogUpdate {
+	_u.mutation.ClearUpstreamModel()
+	return _u
+}
+
 // SetGroupID sets the "group_id" field.
 func (_u *UsageLogUpdate) SetGroupID(v int64) *UsageLogUpdate {
 	_u.mutation.SetGroupID(v)
@@ -745,6 +765,11 @@ func (_u *UsageLogUpdate) check() error {
 			return &ValidationError{Name: "model", err: fmt.Errorf(`ent: validator failed for field "UsageLog.model": %w`, err)}
 		}
 	}
+	if v, ok := _u.mutation.UpstreamModel(); ok {
+		if err := usagelog.UpstreamModelValidator(v); err != nil {
+			return &ValidationError{Name: "upstream_model", err: fmt.Errorf(`ent: validator failed for field "UsageLog.upstream_model": %w`, err)}
+		}
+	}
 	if v, ok := _u.mutation.UserAgent(); ok {
 		if err := usagelog.UserAgentValidator(v); err != nil {
 			return &ValidationError{Name: "user_agent", err: fmt.Errorf(`ent: validator failed for field "UsageLog.user_agent": %w`, err)}
@@ -795,6 +820,12 @@ func (_u *UsageLogUpdate) sqlSave(ctx context.Context) (_node int, err error) {
 	if value, ok := _u.mutation.Model(); ok {
 		_spec.SetField(usagelog.FieldModel, field.TypeString, value)
 	}
+	if value, ok := _u.mutation.UpstreamModel(); ok {
+		_spec.SetField(usagelog.FieldUpstreamModel, field.TypeString, value)
+	}
+	if _u.mutation.UpstreamModelCleared() {
+		_spec.ClearField(usagelog.FieldUpstreamModel, field.TypeString)
+	}
 	if value, ok := _u.mutation.InputTokens(); ok {
 		_spec.SetField(usagelog.FieldInputTokens, field.TypeInt, value)
 	}
@@ -1177,6 +1208,26 @@ func (_u *UsageLogUpdateOne) SetNillableModel(v *string) *UsageLogUpdateOne {
 	return _u
 }

+// SetUpstreamModel sets the "upstream_model" field.
+func (_u *UsageLogUpdateOne) SetUpstreamModel(v string) *UsageLogUpdateOne {
+	_u.mutation.SetUpstreamModel(v)
+	return _u
+}
+
+// SetNillableUpstreamModel sets the "upstream_model" field if the given value is not nil.
+func (_u *UsageLogUpdateOne) SetNillableUpstreamModel(v *string) *UsageLogUpdateOne {
+	if v != nil {
+		_u.SetUpstreamModel(*v)
+	}
+	return _u
+}
+
+// ClearUpstreamModel clears the value of the "upstream_model" field.
+func (_u *UsageLogUpdateOne) ClearUpstreamModel() *UsageLogUpdateOne {
+	_u.mutation.ClearUpstreamModel()
+	return _u
+}
+
 // SetGroupID sets the "group_id" field.
 func (_u *UsageLogUpdateOne) SetGroupID(v int64) *UsageLogUpdateOne {
 	_u.mutation.SetGroupID(v)
@@ -1833,6 +1884,11 @@ func (_u *UsageLogUpdateOne) check() error {
 			return &ValidationError{Name: "model", err: fmt.Errorf(`ent: validator failed for field "UsageLog.model": %w`, err)}
 		}
 	}
+	if v, ok := _u.mutation.UpstreamModel(); ok {
+		if err := usagelog.UpstreamModelValidator(v); err != nil {
+			return &ValidationError{Name: "upstream_model", err: fmt.Errorf(`ent: validator failed for field "UsageLog.upstream_model": %w`, err)}
+		}
+	}
 	if v, ok := _u.mutation.UserAgent(); ok {
 		if err := usagelog.UserAgentValidator(v); err != nil {
 			return &ValidationError{Name: "user_agent", err: fmt.Errorf(`ent: validator failed for field "UsageLog.user_agent": %w`, err)}
@@ -1900,6 +1956,12 @@ func (_u *UsageLogUpdateOne) sqlSave(ctx context.Context) (_node *UsageLog, err
 	if value, ok := _u.mutation.Model(); ok {
 		_spec.SetField(usagelog.FieldModel, field.TypeString, value)
 	}
+	if value, ok := _u.mutation.UpstreamModel(); ok {
+		_spec.SetField(usagelog.FieldUpstreamModel, field.TypeString, value)
+	}
+	if _u.mutation.UpstreamModelCleared() {
+		_spec.ClearField(usagelog.FieldUpstreamModel, field.TypeString)
+	}
 	if value, ok := _u.mutation.InputTokens(); ok {
 		_spec.SetField(usagelog.FieldInputTokens, field.TypeInt, value)
 	}
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -22,8 +22,6 @@ github.com/andybalholm/brotli v1.2.0 h1:ukwgCxwYrmACq68yiUqwIWnGY0cTPox/M94sVwTo
 github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/apparentlymart/go-textseg/v15 v15.0.0 h1:uYvfpb3DyLSCGWnctWKGj857c6ew1u1fNQOlOtuGxQY=
 github.com/apparentlymart/go-textseg/v15 v15.0.0/go.mod h1:K8XmNZdhEBkdlyDdvbmmsvpAG721bKi0joRfFdHIWJ4=
-github.com/aws/aws-sdk-go-v2 v1.41.2 h1:LuT2rzqNQsauaGkPK/7813XxcZ3o3yePY0Iy891T2ls=
-github.com/aws/aws-sdk-go-v2 v1.41.2/go.mod h1:IvvlAZQXvTXznUPfRVfryiG1fbzE2NGK6m9u39YQ+S4=
 github.com/aws/aws-sdk-go-v2 v1.41.3 h1:4kQ/fa22KjDt13QCy1+bYADvdgcxpfH18f0zP542kZA=
 github.com/aws/aws-sdk-go-v2 v1.41.3/go.mod h1:mwsPRE8ceUUpiTgF7QmQIJ7lgsKUPQOUl3o72QBrE1o=
 github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.5 h1:zWFmPmgw4sveAYi1mRqG+E/g0461cJ5M4bJ8/nc6d3Q=
@@ -60,8 +58,6 @@ github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.15 h1:edCcNp9eGIUDUCrzoCu1jWA
 github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.15/go.mod h1:lyRQKED9xWfgkYC/wmmYfv7iVIM68Z5OQ88ZdcV1QbU=
 github.com/aws/aws-sdk-go-v2/service/sts v1.41.7 h1:NITQpgo9A5NrDZ57uOWj+abvXSb83BbyggcUBVksN7c=
 github.com/aws/aws-sdk-go-v2/service/sts v1.41.7/go.mod h1:sks5UWBhEuWYDPdwlnRFn1w7xWdH29Jcpe+/PJQefEs=
-github.com/aws/smithy-go v1.24.1 h1:VbyeNfmYkWoxMVpGUAbQumkODcYmfMRfZ8yQiH30SK0=
-github.com/aws/smithy-go v1.24.1/go.mod h1:LEj2LM3rBRQJxPZTB4KuzZkaZYnZPnvgIhb4pu07mx0=
 github.com/aws/smithy-go v1.24.2 h1:FzA3bu/nt/vDvmnkg+R8Xl46gmzEDam6mZ1hzmwXFng=
 github.com/aws/smithy-go v1.24.2/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=
 github.com/bdandy/go-errors v1.2.2 h1:WdFv/oukjTJCLa79UfkGmwX7ZxONAihKu4V0mLIs11Q=
@@ -98,10 +94,6 @@ github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XL
 github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
 github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 h1:qSGYFH7+jGhDF8vLC+iwCD4WpbV1EBDSzWkJODFLams=
 github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
-github.com/clipperhouse/stringish v0.1.1 h1:+NSqMOr3GR6k1FdRhhnXrLfztGzuG+VuFDfatpWHKCs=
-github.com/clipperhouse/stringish v0.1.1/go.mod h1:v/WhFtE1q0ovMta2+m+UbpZ+2/HEXNWYXQgCt4hdOzA=
-github.com/clipperhouse/uax29/v2 v2.5.0 h1:x7T0T4eTHDONxFJsL94uKNKPHrclyFI0lm7+w94cO8U=
-github.com/clipperhouse/uax29/v2 v2.5.0/go.mod h1:Wn1g7MK6OoeDT0vL+Q0SQLDz/KpfsVRgg6W7ihQeh4g=
 github.com/coder/websocket v1.8.14 h1:9L0p0iKiNOibykf283eHkKUHHrpG7f65OE3BhhO7v9g=
 github.com/coder/websocket v1.8.14/go.mod h1:NX3SzP+inril6yawo5CQXx8+fk145lPDC6pumgx0mVg=
 github.com/containerd/errdefs v1.0.0 h1:tg5yIfIlQIrxYtu9ajqY42W3lpS19XqdxRQeEwYG8PI=
@@ -238,8 +230,6 @@ github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovk
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-github.com/mattn/go-runewidth v0.0.19 h1:v++JhqYnZuu5jSKrk9RbgF5v4CGUjqRfBm05byFGLdw=
-github.com/mattn/go-runewidth v0.0.19/go.mod h1:XBkDxAl56ILZc9knddidhrOlY5R/pDhgLpndooCuJAs=
 github.com/mattn/go-sqlite3 v1.14.17 h1:mCRHCLDUBXgpKAqIKsaAaAsrAlbkeomtRFKXh2L6YIM=
 github.com/mattn/go-sqlite3 v1.14.17/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/mdelapenya/tlscert v0.2.0 h1:7H81W6Z/4weDvZBNOfQte5GpIMo0lGYEeWbkGp5LJHI=
@@ -273,8 +263,6 @@ github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
 github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
-github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
-github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/opencontainers/image-spec v1.1.1 h1:y0fUlFfIZhPF1W537XOLg0/fcx6zcHCJwooC2xJA040=
@@ -326,8 +314,6 @@ github.com/spf13/afero v1.11.0 h1:WJQKhtpdm3v2IzqG8VMqrr6Rf3UYpEF239Jy9wNepM8=
 github.com/spf13/afero v1.11.0/go.mod h1:GH9Y3pIexgf1MTIWtNGyogA5MwRIDXGUr+hbWNoBjkY=
 github.com/spf13/cast v1.6.0 h1:GEiTHELF+vaR5dhz3VqZfFSzZjYbgeKDpBxQVS4GYJ0=
 github.com/spf13/cast v1.6.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
-github.com/spf13/cobra v1.7.0 h1:hyqWnYt1ZQShIddO5kBpj3vu05/++x6tJ6dg8EC572I=
-github.com/spf13/cobra v1.7.0/go.mod h1:uLxZILRyS/50WlhOIKD7W6V5bgeIt+4sICxh6uRMrb0=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.18.2 h1:LUXCnvUvSM6FXAsj6nnfc8Q2tp1dIgUfY9Kc8GsSOiQ=
--- a/backend/internal/handler/admin/dashboard_handler.go
+++ b/backend/internal/handler/admin/dashboard_handler.go
@@ -273,6 +273,7 @@ func (h *DashboardHandler) GetModelStats(c *gin.Context) {

 	// Parse optional filter params
 	var userID, apiKeyID, accountID, groupID int64
+	modelSource := usagestats.ModelSourceRequested
 	var requestType *int16
 	var stream *bool
 	var billingType *int8
@@ -297,6 +298,13 @@ func (h *DashboardHandler) GetModelStats(c *gin.Context) {
 			groupID = id
 		}
 	}
+	if rawModelSource := strings.TrimSpace(c.Query("model_source")); rawModelSource != "" {
+		if !usagestats.IsValidModelSource(rawModelSource) {
+			response.BadRequest(c, "Invalid model_source, use requested/upstream/mapping")
+			return
+		}
+		modelSource = rawModelSource
+	}
 	if requestTypeStr := strings.TrimSpace(c.Query("request_type")); requestTypeStr != "" {
 		parsed, err := service.ParseUsageRequestType(requestTypeStr)
 		if err != nil {
@@ -323,7 +331,7 @@ func (h *DashboardHandler) GetModelStats(c *gin.Context) {
 		}
 	}

-	stats, hit, err := h.getModelStatsCached(c.Request.Context(), startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType)
+	stats, hit, err := h.getModelStatsCached(c.Request.Context(), startTime, endTime, userID, apiKeyID, accountID, groupID, modelSource, requestType, stream, billingType)
 	if err != nil {
 		response.Error(c, 500, "Failed to get model statistics")
 		return
@@ -619,6 +627,12 @@ func (h *DashboardHandler) GetUserBreakdown(c *gin.Context) {
 		}
 	}
 	dim.Model = c.Query("model")
+	rawModelSource := strings.TrimSpace(c.DefaultQuery("model_source", usagestats.ModelSourceRequested))
+	if !usagestats.IsValidModelSource(rawModelSource) {
+		response.BadRequest(c, "Invalid model_source, use requested/upstream/mapping")
+		return
+	}
+	dim.ModelType = rawModelSource
 	dim.Endpoint = c.Query("endpoint")
 	dim.EndpointType = c.DefaultQuery("endpoint_type", "inbound")

--- a/backend/internal/handler/admin/dashboard_handler_request_type_test.go
+++ b/backend/internal/handler/admin/dashboard_handler_request_type_test.go
@@ -149,6 +149,28 @@ func TestDashboardModelStatsInvalidStream(t *testing.T) {
 	require.Equal(t, http.StatusBadRequest, rec.Code)
 }

+func TestDashboardModelStatsInvalidModelSource(t *testing.T) {
+	repo := &dashboardUsageRepoCapture{}
+	router := newDashboardRequestTypeTestRouter(repo)
+
+	req := httptest.NewRequest(http.MethodGet, "/admin/dashboard/models?model_source=invalid", nil)
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusBadRequest, rec.Code)
+}
+
+func TestDashboardModelStatsValidModelSource(t *testing.T) {
+	repo := &dashboardUsageRepoCapture{}
+	router := newDashboardRequestTypeTestRouter(repo)
+
+	req := httptest.NewRequest(http.MethodGet, "/admin/dashboard/models?model_source=upstream", nil)
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+}
+
 func TestDashboardUsersRankingLimitAndCache(t *testing.T) {
 	dashboardUsersRankingCache = newSnapshotCache(5 * time.Minute)
 	repo := &dashboardUsageRepoCapture{
--- a/backend/internal/handler/admin/dashboard_handler_user_breakdown_test.go
+++ b/backend/internal/handler/admin/dashboard_handler_user_breakdown_test.go
@@ -73,9 +73,35 @@ func TestGetUserBreakdown_ModelFilter(t *testing.T) {

 	require.Equal(t, http.StatusOK, w.Code)
 	require.Equal(t, "claude-opus-4-6", repo.capturedDim.Model)
+	require.Equal(t, usagestats.ModelSourceRequested, repo.capturedDim.ModelType)
 	require.Equal(t, int64(0), repo.capturedDim.GroupID)
 }

+func TestGetUserBreakdown_ModelSourceFilter(t *testing.T) {
+	repo := &userBreakdownRepoCapture{}
+	router := newUserBreakdownRouter(repo)
+
+	req := httptest.NewRequest(http.MethodGet,
+		"/admin/dashboard/user-breakdown?start_date=2026-03-01&end_date=2026-03-16&model=claude-opus-4-6&model_source=upstream", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	require.Equal(t, http.StatusOK, w.Code)
+	require.Equal(t, usagestats.ModelSourceUpstream, repo.capturedDim.ModelType)
+}
+
+func TestGetUserBreakdown_InvalidModelSource(t *testing.T) {
+	repo := &userBreakdownRepoCapture{}
+	router := newUserBreakdownRouter(repo)
+
+	req := httptest.NewRequest(http.MethodGet,
+		"/admin/dashboard/user-breakdown?start_date=2026-03-01&end_date=2026-03-16&model_source=foobar", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	require.Equal(t, http.StatusBadRequest, w.Code)
+}
+
 func TestGetUserBreakdown_EndpointFilter(t *testing.T) {
 	repo := &userBreakdownRepoCapture{}
 	router := newUserBreakdownRouter(repo)
--- a/backend/internal/handler/admin/dashboard_query_cache.go
+++ b/backend/internal/handler/admin/dashboard_query_cache.go
@@ -38,6 +38,7 @@ type dashboardModelGroupCacheKey struct {
 	APIKeyID    int64  `json:"api_key_id"`
 	AccountID   int64  `json:"account_id"`
 	GroupID     int64  `json:"group_id"`
+	ModelSource string `json:"model_source,omitempty"`
 	RequestType *int16 `json:"request_type"`
 	Stream      *bool  `json:"stream"`
 	BillingType *int8  `json:"billing_type"`
@@ -111,6 +112,7 @@ func (h *DashboardHandler) getModelStatsCached(
 	ctx context.Context,
 	startTime, endTime time.Time,
 	userID, apiKeyID, accountID, groupID int64,
+	modelSource string,
 	requestType *int16,
 	stream *bool,
 	billingType *int8,
@@ -122,12 +124,13 @@ func (h *DashboardHandler) getModelStatsCached(
 		APIKeyID:    apiKeyID,
 		AccountID:   accountID,
 		GroupID:     groupID,
+		ModelSource: usagestats.NormalizeModelSource(modelSource),
 		RequestType: requestType,
 		Stream:      stream,
 		BillingType: billingType,
 	})
 	entry, hit, err := dashboardModelStatsCache.GetOrLoad(key, func() (any, error) {
-		return h.dashboardService.GetModelStatsWithFilters(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType)
+		return h.dashboardService.GetModelStatsWithFiltersBySource(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType, modelSource)
 	})
 	if err != nil {
 		return nil, hit, err
--- a/backend/internal/handler/admin/dashboard_snapshot_v2_handler.go
+++ b/backend/internal/handler/admin/dashboard_snapshot_v2_handler.go
@@ -200,6 +200,7 @@ func (h *DashboardHandler) buildSnapshotV2Response(
 			filters.APIKeyID,
 			filters.AccountID,
 			filters.GroupID,
+			usagestats.ModelSourceRequested,
 			filters.RequestType,
 			filters.Stream,
 			filters.BillingType,
--- a/backend/internal/handler/dto/mappers.go
+++ b/backend/internal/handler/dto/mappers.go
@@ -523,6 +523,7 @@ func usageLogFromServiceUser(l *service.UsageLog) UsageLog {
 		AccountID:             l.AccountID,
 		RequestID:             l.RequestID,
 		Model:                 l.Model,
+		UpstreamModel:         l.UpstreamModel,
 		ServiceTier:           l.ServiceTier,
 		ReasoningEffort:       l.ReasoningEffort,
 		InboundEndpoint:       l.InboundEndpoint,
--- a/backend/internal/handler/dto/types.go
+++ b/backend/internal/handler/dto/types.go
@@ -334,6 +334,9 @@ type UsageLog struct {
 	AccountID int64  `json:"account_id"`
 	RequestID string `json:"request_id"`
 	Model     string `json:"model"`
+	// UpstreamModel is the actual model sent to the upstream provider after mapping.
+	// Omitted when no mapping was applied (requested model was used as-is).
+	UpstreamModel *string `json:"upstream_model,omitempty"`
 	// ServiceTier records the OpenAI service tier used for billing, e.g. "priority" / "flex".
 	ServiceTier *string `json:"service_tier,omitempty"`
 	// ReasoningEffort is the request's reasoning effort level.
--- a/backend/internal/pkg/usagestats/usage_log_types.go
+++ b/backend/internal/pkg/usagestats/usage_log_types.go
@@ -3,6 +3,28 @@ package usagestats

 import "time"

+const (
+	ModelSourceRequested = "requested"
+	ModelSourceUpstream  = "upstream"
+	ModelSourceMapping   = "mapping"
+)
+
+func IsValidModelSource(source string) bool {
+	switch source {
+	case ModelSourceRequested, ModelSourceUpstream, ModelSourceMapping:
+		return true
+	default:
+		return false
+	}
+}
+
+func NormalizeModelSource(source string) string {
+	if IsValidModelSource(source) {
+		return source
+	}
+	return ModelSourceRequested
+}
+
 // DashboardStats 仪表盘统计
 type DashboardStats struct {
 	// 用户统计
@@ -150,6 +172,7 @@ type UserBreakdownItem struct {
 type UserBreakdownDimension struct {
 	GroupID      int64  // filter by group_id (>0 to enable)
 	Model        string // filter by model name (non-empty to enable)
+	ModelType    string // "requested", "upstream", or "mapping"
 	Endpoint     string // filter by endpoint value (non-empty to enable)
 	EndpointType string // "inbound", "upstream", or "path"
 }
--- a/backend/internal/pkg/usagestats/usage_log_types_test.go
+++ b/backend/internal/pkg/usagestats/usage_log_types_test.go
@@ -0,0 +1,47 @@
+package usagestats
+
+import "testing"
+
+func TestIsValidModelSource(t *testing.T) {
+	tests := []struct {
+		name   string
+		source string
+		want   bool
+	}{
+		{name: "requested", source: ModelSourceRequested, want: true},
+		{name: "upstream", source: ModelSourceUpstream, want: true},
+		{name: "mapping", source: ModelSourceMapping, want: true},
+		{name: "invalid", source: "foobar", want: false},
+		{name: "empty", source: "", want: false},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := IsValidModelSource(tc.source); got != tc.want {
+				t.Fatalf("IsValidModelSource(%q)=%v want %v", tc.source, got, tc.want)
+			}
+		})
+	}
+}
+
+func TestNormalizeModelSource(t *testing.T) {
+	tests := []struct {
+		name   string
+		source string
+		want   string
+	}{
+		{name: "requested", source: ModelSourceRequested, want: ModelSourceRequested},
+		{name: "upstream", source: ModelSourceUpstream, want: ModelSourceUpstream},
+		{name: "mapping", source: ModelSourceMapping, want: ModelSourceMapping},
+		{name: "invalid falls back", source: "foobar", want: ModelSourceRequested},
+		{name: "empty falls back", source: "", want: ModelSourceRequested},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := NormalizeModelSource(tc.source); got != tc.want {
+				t.Fatalf("NormalizeModelSource(%q)=%q want %q", tc.source, got, tc.want)
+			}
+		})
+	}
+}
--- a/backend/internal/repository/usage_log_repo.go
+++ b/backend/internal/repository/usage_log_repo.go
@@ -28,7 +28,7 @@ import (
 	gocache "github.com/patrickmn/go-cache"
 )

-const usageLogSelectColumns = "id, user_id, api_key_id, account_id, request_id, model, group_id, subscription_id, input_tokens, output_tokens, cache_creation_tokens, cache_read_tokens, cache_creation_5m_tokens, cache_creation_1h_tokens, input_cost, output_cost, cache_creation_cost, cache_read_cost, total_cost, actual_cost, rate_multiplier, account_rate_multiplier, billing_type, request_type, stream, openai_ws_mode, duration_ms, first_token_ms, user_agent, ip_address, image_count, image_size, media_type, service_tier, reasoning_effort, inbound_endpoint, upstream_endpoint, cache_ttl_overridden, created_at"
+const usageLogSelectColumns = "id, user_id, api_key_id, account_id, request_id, model, upstream_model, group_id, subscription_id, input_tokens, output_tokens, cache_creation_tokens, cache_read_tokens, cache_creation_5m_tokens, cache_creation_1h_tokens, input_cost, output_cost, cache_creation_cost, cache_read_cost, total_cost, actual_cost, rate_multiplier, account_rate_multiplier, billing_type, request_type, stream, openai_ws_mode, duration_ms, first_token_ms, user_agent, ip_address, image_count, image_size, media_type, service_tier, reasoning_effort, inbound_endpoint, upstream_endpoint, cache_ttl_overridden, created_at"

 var usageLogInsertArgTypes = [...]string{
 	"bigint",
@@ -36,6 +36,7 @@ var usageLogInsertArgTypes = [...]string{
 	"bigint",
 	"text",
 	"text",
+	"text",
 	"bigint",
 	"bigint",
 	"integer",
@@ -277,6 +278,7 @@ func (r *usageLogRepository) createSingle(ctx context.Context, sqlq sqlExecutor,
 			account_id,
 			request_id,
 			model,
+			upstream_model,
 			group_id,
 			subscription_id,
 			input_tokens,
@@ -311,12 +313,12 @@ func (r *usageLogRepository) createSingle(ctx context.Context, sqlq sqlExecutor,
 			cache_ttl_overridden,
 			created_at
 		) VALUES (
-			$1, $2, $3, $4, $5,
-			$6, $7,
-			$8, $9, $10, $11,
-			$12, $13,
-			$14, $15, $16, $17, $18, $19,
-			$20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32, $33, $34, $35, $36, $37, $38
+			$1, $2, $3, $4, $5, $6,
+			$7, $8,
+			$9, $10, $11, $12,
+			$13, $14,
+			$15, $16, $17, $18, $19, $20,
+			$21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32, $33, $34, $35, $36, $37, $38, $39
 		)
 		ON CONFLICT (request_id, api_key_id) DO NOTHING
 		RETURNING id, created_at
@@ -707,6 +709,7 @@ func buildUsageLogBatchInsertQuery(keys []string, preparedByKey map[string]usage
 			account_id,
 			request_id,
 			model,
+			upstream_model,
 			group_id,
 			subscription_id,
 			input_tokens,
@@ -742,7 +745,7 @@ func buildUsageLogBatchInsertQuery(keys []string, preparedByKey map[string]usage
 			created_at
 		) AS (VALUES `)

-	args := make([]any, 0, len(keys)*38)
+	args := make([]any, 0, len(keys)*39)
 	argPos := 1
 	for idx, key := range keys {
 		if idx > 0 {
@@ -776,6 +779,7 @@ func buildUsageLogBatchInsertQuery(keys []string, preparedByKey map[string]usage
 				account_id,
 				request_id,
 				model,
+				upstream_model,
 				group_id,
 				subscription_id,
 				input_tokens,
@@ -816,6 +820,7 @@ func buildUsageLogBatchInsertQuery(keys []string, preparedByKey map[string]usage
 				account_id,
 				request_id,
 				model,
+				upstream_model,
 				group_id,
 				subscription_id,
 				input_tokens,
@@ -896,6 +901,7 @@ func buildUsageLogBestEffortInsertQuery(preparedList []usageLogInsertPrepared) (
 			account_id,
 			request_id,
 			model,
+			upstream_model,
 			group_id,
 			subscription_id,
 			input_tokens,
@@ -931,7 +937,7 @@ func buildUsageLogBestEffortInsertQuery(preparedList []usageLogInsertPrepared) (
 			created_at
 		) AS (VALUES `)

-	args := make([]any, 0, len(preparedList)*38)
+	args := make([]any, 0, len(preparedList)*39)
 	argPos := 1
 	for idx, prepared := range preparedList {
 		if idx > 0 {
@@ -962,6 +968,7 @@ func buildUsageLogBestEffortInsertQuery(preparedList []usageLogInsertPrepared) (
 			account_id,
 			request_id,
 			model,
+			upstream_model,
 			group_id,
 			subscription_id,
 			input_tokens,
@@ -1002,6 +1009,7 @@ func buildUsageLogBestEffortInsertQuery(preparedList []usageLogInsertPrepared) (
 			account_id,
 			request_id,
 			model,
+			upstream_model,
 			group_id,
 			subscription_id,
 			input_tokens,
@@ -1050,6 +1058,7 @@ func execUsageLogInsertNoResult(ctx context.Context, sqlq sqlExecutor, prepared
 			account_id,
 			request_id,
 			model,
+			upstream_model,
 			group_id,
 			subscription_id,
 			input_tokens,
@@ -1084,12 +1093,12 @@ func execUsageLogInsertNoResult(ctx context.Context, sqlq sqlExecutor, prepared
 			cache_ttl_overridden,
 			created_at
 		) VALUES (
-			$1, $2, $3, $4, $5,
-			$6, $7,
-			$8, $9, $10, $11,
-			$12, $13,
-			$14, $15, $16, $17, $18, $19,
-			$20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32, $33, $34, $35, $36, $37, $38
+			$1, $2, $3, $4, $5, $6,
+			$7, $8,
+			$9, $10, $11, $12,
+			$13, $14,
+			$15, $16, $17, $18, $19, $20,
+			$21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32, $33, $34, $35, $36, $37, $38, $39
 		)
 		ON CONFLICT (request_id, api_key_id) DO NOTHING
 	`, prepared.args...)
@@ -1121,6 +1130,7 @@ func prepareUsageLogInsert(log *service.UsageLog) usageLogInsertPrepared {
 	reasoningEffort := nullString(log.ReasoningEffort)
 	inboundEndpoint := nullString(log.InboundEndpoint)
 	upstreamEndpoint := nullString(log.UpstreamEndpoint)
+	upstreamModel := nullString(log.UpstreamModel)

 	var requestIDArg any
 	if requestID != "" {
@@ -1138,6 +1148,7 @@ func prepareUsageLogInsert(log *service.UsageLog) usageLogInsertPrepared {
 			log.AccountID,
 			requestIDArg,
 			log.Model,
+			upstreamModel,
 			groupID,
 			subscriptionID,
 			log.InputTokens,
@@ -2864,15 +2875,26 @@ func (r *usageLogRepository) getUsageTrendFromAggregates(ctx context.Context, st

 // GetModelStatsWithFilters returns model statistics with optional filters
 func (r *usageLogRepository) GetModelStatsWithFilters(ctx context.Context, startTime, endTime time.Time, userID, apiKeyID, accountID, groupID int64, requestType *int16, stream *bool, billingType *int8) (results []ModelStat, err error) {
+	return r.getModelStatsWithFiltersBySource(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType, usagestats.ModelSourceRequested)
+}
+
+// GetModelStatsWithFiltersBySource returns model statistics with optional filters and model source dimension.
+// source: requested | upstream | mapping.
+func (r *usageLogRepository) GetModelStatsWithFiltersBySource(ctx context.Context, startTime, endTime time.Time, userID, apiKeyID, accountID, groupID int64, requestType *int16, stream *bool, billingType *int8, source string) (results []ModelStat, err error) {
+	return r.getModelStatsWithFiltersBySource(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType, source)
+}
+
+func (r *usageLogRepository) getModelStatsWithFiltersBySource(ctx context.Context, startTime, endTime time.Time, userID, apiKeyID, accountID, groupID int64, requestType *int16, stream *bool, billingType *int8, source string) (results []ModelStat, err error) {
 	actualCostExpr := "COALESCE(SUM(actual_cost), 0) as actual_cost"
 	// 当仅按 account_id 聚合时，实际费用使用账号倍率（total_cost * account_rate_multiplier）。
 	if accountID > 0 && userID == 0 && apiKeyID == 0 {
 		actualCostExpr = "COALESCE(SUM(total_cost * COALESCE(account_rate_multiplier, 1)), 0) as actual_cost"
 	}
+	modelExpr := resolveModelDimensionExpression(source)

 	query := fmt.Sprintf(`
 		SELECT
-			model,
+			%s as model,
 			COUNT(*) as requests,
 			COALESCE(SUM(input_tokens), 0) as input_tokens,
 			COALESCE(SUM(output_tokens), 0) as output_tokens,
@@ -2883,7 +2905,7 @@ func (r *usageLogRepository) GetModelStatsWithFilters(ctx context.Context, start
 			%s
 		FROM usage_logs
 		WHERE created_at >= $1 AND created_at < $2
-	`, actualCostExpr)
+	`, modelExpr, actualCostExpr)

 	args := []any{startTime, endTime}
 	if userID > 0 {
@@ -2907,7 +2929,7 @@ func (r *usageLogRepository) GetModelStatsWithFilters(ctx context.Context, start
 		query += fmt.Sprintf(" AND billing_type = $%d", len(args)+1)
 		args = append(args, int16(*billingType))
 	}
-	query += " GROUP BY model ORDER BY total_tokens DESC"
+	query += fmt.Sprintf(" GROUP BY %s ORDER BY total_tokens DESC", modelExpr)

 	rows, err := r.sql.QueryContext(ctx, query, args...)
 	if err != nil {
@@ -3021,7 +3043,7 @@ func (r *usageLogRepository) GetUserBreakdownStats(ctx context.Context, startTim
 		args = append(args, dim.GroupID)
 	}
 	if dim.Model != "" {
-		query += fmt.Sprintf(" AND ul.model = $%d", len(args)+1)
+		query += fmt.Sprintf(" AND %s = $%d", resolveModelDimensionExpression(dim.ModelType), len(args)+1)
 		args = append(args, dim.Model)
 	}
 	if dim.Endpoint != "" {
@@ -3102,6 +3124,18 @@ func (r *usageLogRepository) GetAllGroupUsageSummary(ctx context.Context, todayS
 	return results, nil
 }

+// resolveModelDimensionExpression maps model source type to a safe SQL expression.
+func resolveModelDimensionExpression(modelType string) string {
+	switch usagestats.NormalizeModelSource(modelType) {
+	case usagestats.ModelSourceUpstream:
+		return "COALESCE(NULLIF(TRIM(upstream_model), ''), model)"
+	case usagestats.ModelSourceMapping:
+		return "(model || ' -> ' || COALESCE(NULLIF(TRIM(upstream_model), ''), model))"
+	default:
+		return "model"
+	}
+}
+
 // resolveEndpointColumn maps endpoint type to the corresponding DB column name.
 func resolveEndpointColumn(endpointType string) string {
 	switch endpointType {
@@ -3854,6 +3888,7 @@ func scanUsageLog(scanner interface{ Scan(...any) error }) (*service.UsageLog, e
 		accountID             int64
 		requestID             sql.NullString
 		model                 string
+		upstreamModel         sql.NullString
 		groupID               sql.NullInt64
 		subscriptionID        sql.NullInt64
 		inputTokens           int
@@ -3896,6 +3931,7 @@ func scanUsageLog(scanner interface{ Scan(...any) error }) (*service.UsageLog, e
 		&accountID,
 		&requestID,
 		&model,
+		&upstreamModel,
 		&groupID,
 		&subscriptionID,
 		&inputTokens,
@@ -4008,6 +4044,9 @@ func scanUsageLog(scanner interface{ Scan(...any) error }) (*service.UsageLog, e
 	if upstreamEndpoint.Valid {
 		log.UpstreamEndpoint = &upstreamEndpoint.String
 	}
+	if upstreamModel.Valid {
+		log.UpstreamModel = &upstreamModel.String
+	}

 	return log, nil
 }
--- a/backend/internal/repository/usage_log_repo_breakdown_test.go
+++ b/backend/internal/repository/usage_log_repo_breakdown_test.go
@@ -5,6 +5,7 @@ package repository
 import (
 	"testing"

+	"github.com/Wei-Shaw/sub2api/internal/pkg/usagestats"
 	"github.com/stretchr/testify/require"
 )

@@ -16,8 +17,8 @@ func TestResolveEndpointColumn(t *testing.T) {
 		{"inbound", "ul.inbound_endpoint"},
 		{"upstream", "ul.upstream_endpoint"},
 		{"path", "ul.inbound_endpoint || ' -> ' || ul.upstream_endpoint"},
-		{"", "ul.inbound_endpoint"},           // default
-		{"unknown", "ul.inbound_endpoint"},     // fallback
+		{"", "ul.inbound_endpoint"},        // default
+		{"unknown", "ul.inbound_endpoint"}, // fallback
 	}

 	for _, tc := range tests {
@@ -27,3 +28,23 @@ func TestResolveEndpointColumn(t *testing.T) {
 		})
 	}
 }
+
+func TestResolveModelDimensionExpression(t *testing.T) {
+	tests := []struct {
+		modelType string
+		want      string
+	}{
+		{usagestats.ModelSourceRequested, "model"},
+		{usagestats.ModelSourceUpstream, "COALESCE(NULLIF(TRIM(upstream_model), ''), model)"},
+		{usagestats.ModelSourceMapping, "(model || ' -> ' || COALESCE(NULLIF(TRIM(upstream_model), ''), model))"},
+		{"", "model"},
+		{"invalid", "model"},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.modelType, func(t *testing.T) {
+			got := resolveModelDimensionExpression(tc.modelType)
+			require.Equal(t, tc.want, got)
+		})
+	}
+}
--- a/backend/internal/repository/usage_log_repo_request_type_test.go
+++ b/backend/internal/repository/usage_log_repo_request_type_test.go
@@ -44,6 +44,7 @@ func TestUsageLogRepositoryCreateSyncRequestTypeAndLegacyFields(t *testing.T) {
 			log.AccountID,
 			log.RequestID,
 			log.Model,
+			sqlmock.AnyArg(), // upstream_model
 			sqlmock.AnyArg(), // group_id
 			sqlmock.AnyArg(), // subscription_id
 			log.InputTokens,
@@ -116,6 +117,7 @@ func TestUsageLogRepositoryCreate_PersistsServiceTier(t *testing.T) {
 			log.Model,
 			sqlmock.AnyArg(),
 			sqlmock.AnyArg(),
+			sqlmock.AnyArg(),
 			log.InputTokens,
 			log.OutputTokens,
 			log.CacheCreationTokens,
@@ -353,6 +355,7 @@ func TestScanUsageLogRequestTypeAndLegacyFallback(t *testing.T) {
 			int64(30), // account_id
 			sql.NullString{Valid: true, String: "req-1"},
 			"gpt-5",           // model
+			sql.NullString{},  // upstream_model
 			sql.NullInt64{},   // group_id
 			sql.NullInt64{},   // subscription_id
 			1,                 // input_tokens
@@ -404,6 +407,7 @@ func TestScanUsageLogRequestTypeAndLegacyFallback(t *testing.T) {
 			int64(31),
 			sql.NullString{Valid: true, String: "req-2"},
 			"gpt-5",
+			sql.NullString{},
 			sql.NullInt64{},
 			sql.NullInt64{},
 			1, 2, 3, 4, 5, 6,
@@ -445,6 +449,7 @@ func TestScanUsageLogRequestTypeAndLegacyFallback(t *testing.T) {
 			int64(32),
 			sql.NullString{Valid: true, String: "req-3"},
 			"gpt-5.4",
+			sql.NullString{},
 			sql.NullInt64{},
 			sql.NullInt64{},
 			1, 2, 3, 4, 5, 6,
--- a/backend/internal/service/dashboard_service.go
+++ b/backend/internal/service/dashboard_service.go
@@ -140,6 +140,27 @@ func (s *DashboardService) GetModelStatsWithFilters(ctx context.Context, startTi
 	return stats, nil
 }

+func (s *DashboardService) GetModelStatsWithFiltersBySource(ctx context.Context, startTime, endTime time.Time, userID, apiKeyID, accountID, groupID int64, requestType *int16, stream *bool, billingType *int8, modelSource string) ([]usagestats.ModelStat, error) {
+	normalizedSource := usagestats.NormalizeModelSource(modelSource)
+	if normalizedSource == usagestats.ModelSourceRequested {
+		return s.GetModelStatsWithFilters(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType)
+	}
+
+	type modelStatsBySourceRepo interface {
+		GetModelStatsWithFiltersBySource(ctx context.Context, startTime, endTime time.Time, userID, apiKeyID, accountID, groupID int64, requestType *int16, stream *bool, billingType *int8, source string) ([]usagestats.ModelStat, error)
+	}
+
+	if sourceRepo, ok := s.usageRepo.(modelStatsBySourceRepo); ok {
+		stats, err := sourceRepo.GetModelStatsWithFiltersBySource(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType, normalizedSource)
+		if err != nil {
+			return nil, fmt.Errorf("get model stats with filters by source: %w", err)
+		}
+		return stats, nil
+	}
+
+	return s.GetModelStatsWithFilters(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType)
+}
+
 func (s *DashboardService) GetGroupStatsWithFilters(ctx context.Context, startTime, endTime time.Time, userID, apiKeyID, accountID, groupID int64, requestType *int16, stream *bool, billingType *int8) ([]usagestats.GroupStat, error) {
 	stats, err := s.usageRepo.GetGroupStatsWithFilters(ctx, startTime, endTime, userID, apiKeyID, accountID, groupID, requestType, stream, billingType)
 	if err != nil {
--- a/backend/internal/service/gateway_anthropic_apikey_passthrough_test.go
+++ b/backend/internal/service/gateway_anthropic_apikey_passthrough_test.go
@@ -788,7 +788,7 @@ func TestGatewayService_AnthropicAPIKeyPassthrough_ForwardDirect_NonStreamingSuc
 		rateLimitService: &RateLimitService{},
 	}

-	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, newAnthropicAPIKeyAccountForTest(), body, "claude-3-5-sonnet-latest", false, time.Now())
+	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, newAnthropicAPIKeyAccountForTest(), body, "claude-3-5-sonnet-latest", "claude-3-5-sonnet-latest", false, time.Now())
 	require.NoError(t, err)
 	require.NotNil(t, result)
 	require.Equal(t, 12, result.Usage.InputTokens)
@@ -815,7 +815,7 @@ func TestGatewayService_AnthropicAPIKeyPassthrough_ForwardDirect_InvalidTokenTyp
 	}
 	svc := &GatewayService{}

-	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, account, []byte(`{}`), "claude-3-5-sonnet-latest", false, time.Now())
+	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, account, []byte(`{}`), "claude-3-5-sonnet-latest", "claude-3-5-sonnet-latest", false, time.Now())
 	require.Nil(t, result)
 	require.Error(t, err)
 	require.Contains(t, err.Error(), "requires apikey token")
@@ -840,7 +840,7 @@ func TestGatewayService_AnthropicAPIKeyPassthrough_ForwardDirect_UpstreamRequest
 	}
 	account := newAnthropicAPIKeyAccountForTest()

-	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, account, []byte(`{"model":"x"}`), "x", false, time.Now())
+	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, account, []byte(`{"model":"x"}`), "x", "x", false, time.Now())
 	require.Nil(t, result)
 	require.Error(t, err)
 	require.Contains(t, err.Error(), "upstream request failed")
@@ -873,7 +873,7 @@ func TestGatewayService_AnthropicAPIKeyPassthrough_ForwardDirect_EmptyResponseBo
 		httpUpstream: upstream,
 	}

-	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, newAnthropicAPIKeyAccountForTest(), []byte(`{"model":"x"}`), "x", false, time.Now())
+	result, err := svc.forwardAnthropicAPIKeyPassthrough(context.Background(), c, newAnthropicAPIKeyAccountForTest(), []byte(`{"model":"x"}`), "x", "x", false, time.Now())
 	require.Nil(t, result)
 	require.Error(t, err)
 	require.Contains(t, err.Error(), "empty response")
--- a/backend/internal/service/gateway_service.go
+++ b/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),
--- a/backend/internal/service/openai_gateway_chat_completions.go
+++ b/backend/internal/service/openai_gateway_chat_completions.go
@@ -277,12 +277,13 @@ func (s *OpenAIGatewayService) handleChatBufferedStreamingResponse(
 	c.JSON(http.StatusOK, chatResp)

 	return &OpenAIForwardResult{
-		RequestID:    requestID,
-		Usage:        usage,
-		Model:        originalModel,
-		BillingModel: mappedModel,
-		Stream:       false,
-		Duration:     time.Since(startTime),
+		RequestID:     requestID,
+		Usage:         usage,
+		Model:         originalModel,
+		BillingModel:  mappedModel,
+		UpstreamModel: mappedModel,
+		Stream:        false,
+		Duration:      time.Since(startTime),
 	}, nil
 }

@@ -324,13 +325,14 @@ func (s *OpenAIGatewayService) handleChatStreamingResponse(

 	resultWithUsage := func() *OpenAIForwardResult {
 		return &OpenAIForwardResult{
-			RequestID:    requestID,
-			Usage:        usage,
-			Model:        originalModel,
-			BillingModel: mappedModel,
-			Stream:       true,
-			Duration:     time.Since(startTime),
-			FirstTokenMs: firstTokenMs,
+			RequestID:     requestID,
+			Usage:         usage,
+			Model:         originalModel,
+			BillingModel:  mappedModel,
+			UpstreamModel: mappedModel,
+			Stream:        true,
+			Duration:      time.Since(startTime),
+			FirstTokenMs:  firstTokenMs,
 		}
 	}

--- a/backend/internal/service/openai_gateway_messages.go
+++ b/backend/internal/service/openai_gateway_messages.go
@@ -299,12 +299,13 @@ func (s *OpenAIGatewayService) handleAnthropicBufferedStreamingResponse(
 	c.JSON(http.StatusOK, anthropicResp)

 	return &OpenAIForwardResult{
-		RequestID:    requestID,
-		Usage:        usage,
-		Model:        originalModel,
-		BillingModel: mappedModel,
-		Stream:       false,
-		Duration:     time.Since(startTime),
+		RequestID:     requestID,
+		Usage:         usage,
+		Model:         originalModel,
+		BillingModel:  mappedModel,
+		UpstreamModel: mappedModel,
+		Stream:        false,
+		Duration:      time.Since(startTime),
 	}, nil
 }

@@ -347,13 +348,14 @@ func (s *OpenAIGatewayService) handleAnthropicStreamingResponse(
 	// resultWithUsage builds the final result snapshot.
 	resultWithUsage := func() *OpenAIForwardResult {
 		return &OpenAIForwardResult{
-			RequestID:    requestID,
-			Usage:        usage,
-			Model:        originalModel,
-			BillingModel: mappedModel,
-			Stream:       true,
-			Duration:     time.Since(startTime),
-			FirstTokenMs: firstTokenMs,
+			RequestID:     requestID,
+			Usage:         usage,
+			Model:         originalModel,
+			BillingModel:  mappedModel,
+			UpstreamModel: mappedModel,
+			Stream:        true,
+			Duration:      time.Since(startTime),
+			FirstTokenMs:  firstTokenMs,
 		}
 	}

--- a/backend/internal/service/openai_gateway_record_usage_test.go
+++ b/backend/internal/service/openai_gateway_record_usage_test.go
@@ -846,7 +846,7 @@ func TestExtractOpenAIServiceTierFromBody(t *testing.T) {
 	require.Nil(t, extractOpenAIServiceTierFromBody(nil))
 }

-func TestOpenAIGatewayServiceRecordUsage_UsesBillingModelAndMetadataFields(t *testing.T) {
+func TestOpenAIGatewayServiceRecordUsage_UsesRequestedModelAndUpstreamModelMetadataFields(t *testing.T) {
 	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
 	userRepo := &openAIRecordUsageUserRepoStub{}
 	subRepo := &openAIRecordUsageSubRepoStub{}
@@ -859,6 +859,7 @@ func TestOpenAIGatewayServiceRecordUsage_UsesBillingModelAndMetadataFields(t *te
 			RequestID:       "resp_billing_model_override",
 			BillingModel:    "gpt-5.1-codex",
 			Model:           "gpt-5.1",
+			UpstreamModel:   "gpt-5.1-codex",
 			ServiceTier:     &serviceTier,
 			ReasoningEffort: &reasoning,
 			Usage: OpenAIUsage{
@@ -877,7 +878,9 @@ func TestOpenAIGatewayServiceRecordUsage_UsesBillingModelAndMetadataFields(t *te

 	require.NoError(t, err)
 	require.NotNil(t, usageRepo.lastLog)
-	require.Equal(t, "gpt-5.1-codex", usageRepo.lastLog.Model)
+	require.Equal(t, "gpt-5.1", usageRepo.lastLog.Model)
+	require.NotNil(t, usageRepo.lastLog.UpstreamModel)
+	require.Equal(t, "gpt-5.1-codex", *usageRepo.lastLog.UpstreamModel)
 	require.NotNil(t, usageRepo.lastLog.ServiceTier)
 	require.Equal(t, serviceTier, *usageRepo.lastLog.ServiceTier)
 	require.NotNil(t, usageRepo.lastLog.ReasoningEffort)
--- a/backend/internal/service/openai_gateway_service.go
+++ b/backend/internal/service/openai_gateway_service.go
@@ -216,6 +216,9 @@ type OpenAIForwardResult struct {
 	// This is set by the Anthropic Messages conversion path where
 	// the mapped upstream model differs from the client-facing model.
 	BillingModel string
+	// UpstreamModel is the actual model sent to the upstream provider after mapping.
+	// Empty when no mapping was applied (requested model was used as-is).
+	UpstreamModel string
 	// ServiceTier records the OpenAI Responses API service tier, e.g. "priority" / "flex".
 	// Nil means the request did not specify a recognized tier.
 	ServiceTier *string
@@ -2128,6 +2131,7 @@ func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, acco
 				firstTokenMs,
 				wsAttempts,
 			)
+			wsResult.UpstreamModel = mappedModel
 			return wsResult, nil
 		}
 		s.writeOpenAIWSFallbackErrorResponse(c, account, wsErr)
@@ -2263,6 +2267,7 @@ func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, acco
 			RequestID:       resp.Header.Get("x-request-id"),
 			Usage:           *usage,
 			Model:           originalModel,
+			UpstreamModel:   mappedModel,
 			ServiceTier:     serviceTier,
 			ReasoningEffort: reasoningEffort,
 			Stream:          reqStream,
@@ -4134,7 +4139,8 @@ func (s *OpenAIGatewayService) RecordUsage(ctx context.Context, input *OpenAIRec
 		APIKeyID:              apiKey.ID,
 		AccountID:             account.ID,
 		RequestID:             requestID,
-		Model:                 billingModel,
+		Model:                 result.Model,
+		UpstreamModel:         optionalNonEqualStringPtr(result.UpstreamModel, result.Model),
 		ServiceTier:           result.ServiceTier,
 		ReasoningEffort:       result.ReasoningEffort,
 		InboundEndpoint:       optionalTrimmedStringPtr(input.InboundEndpoint),
@@ -4700,11 +4706,3 @@ func normalizeOpenAIReasoningEffort(raw string) string {
 		return ""
 	}
 }
-
-func optionalTrimmedStringPtr(raw string) *string {
-	trimmed := strings.TrimSpace(raw)
-	if trimmed == "" {
-		return nil
-	}
-	return &trimmed
-}
--- a/backend/internal/service/usage_log.go
+++ b/backend/internal/service/usage_log.go
@@ -98,6 +98,9 @@ type UsageLog struct {
 	AccountID int64
 	RequestID string
 	Model     string
+	// UpstreamModel is the actual model sent to the upstream provider after mapping.
+	// Nil means no mapping was applied (requested model was used as-is).
+	UpstreamModel *string
 	// ServiceTier records the OpenAI service tier used for billing, e.g. "priority" / "flex".
 	ServiceTier *string
 	// ReasoningEffort is the request's reasoning effort level.
--- a/backend/internal/service/usage_log_helpers.go
+++ b/backend/internal/service/usage_log_helpers.go
@@ -0,0 +1,21 @@
+package service
+
+import "strings"
+
+func optionalTrimmedStringPtr(raw string) *string {
+	trimmed := strings.TrimSpace(raw)
+	if trimmed == "" {
+		return nil
+	}
+	return &trimmed
+}
+
+// optionalNonEqualStringPtr returns a pointer to value if it is non-empty and
+// differs from compare; otherwise nil. Used to store upstream_model only when
+// it differs from the requested model.
+func optionalNonEqualStringPtr(value, compare string) *string {
+	if value == "" || value == compare {
+		return nil
+	}
+	return &value
+}
--- a/backend/migrations/075_add_usage_log_upstream_model.sql
+++ b/backend/migrations/075_add_usage_log_upstream_model.sql
@@ -0,0 +1,4 @@
+-- Add upstream_model field to usage_logs.
+-- Stores the actual upstream model name when it differs from the requested model
+-- (i.e., when model mapping is applied). NULL means no mapping was applied.
+ALTER TABLE usage_logs ADD COLUMN IF NOT EXISTS upstream_model VARCHAR(100);
--- a/backend/migrations/076_add_usage_log_upstream_model_index_notx.sql
+++ b/backend/migrations/076_add_usage_log_upstream_model_index_notx.sql
@@ -0,0 +1,3 @@
+-- Support upstream_model / mapping model distribution aggregations with time-range filters.
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_usage_logs_created_model_upstream_model
+ON usage_logs (created_at, model, upstream_model);
--- a/backend/migrations/README.md
+++ b/backend/migrations/README.md
@@ -34,18 +34,18 @@ Example: `017_add_gemini_tier_id.sql`

 ## Migration File Structure

-```sql
-- +goose Up
-- +goose StatementBegin
-- Your forward migration SQL here
-- +goose StatementEnd
+This project uses a custom migration runner (`internal/repository/migrations_runner.go`) that executes the full SQL file content as-is.

-- +goose Down
-- +goose StatementBegin
-- Your rollback migration SQL here
-- +goose StatementEnd
+- Regular migrations (`*.sql`): executed in a transaction.
+- Non-transactional migrations (`*_notx.sql`): split by statement and executed without transaction (for `CONCURRENTLY`).
+
+```sql
+-- Forward-only migration (recommended)
+ALTER TABLE usage_logs ADD COLUMN IF NOT EXISTS example_column VARCHAR(100);
 ```

+> ⚠️ Do **not** place executable "Down" SQL in the same file. The runner does not parse goose Up/Down sections and will execute all SQL statements in the file.
+
 ## Important Rules

 ### ⚠️ Immutability Principle
@@ -66,9 +66,9 @@ Why?
   touch migrations/018_your_change.sql
   ```

-2. **Write Up and Down migrations**
-   - Up: Apply the change
-   - Down: Revert the change (should be symmetric with Up)
+2. **Write forward-only migration SQL**
+   - Put only the intended schema change in the file
+   - If rollback is needed, create a new migration file to revert

 3. **Test locally**
   ```bash
@@ -144,8 +144,6 @@ touch migrations/018_your_new_change.sql
 ## Example Migration

 ```sql
-- +goose Up
-- +goose StatementBegin
 -- Add tier_id field to Gemini OAuth accounts for quota tracking
 UPDATE accounts
 SET credentials = jsonb_set(
@@ -157,17 +155,6 @@ SET credentials = jsonb_set(
 WHERE platform = 'gemini'
  AND type = 'oauth'
  AND credentials->>'tier_id' IS NULL;
-- +goose StatementEnd
-
-- +goose Down
-- +goose StatementBegin
-- Remove tier_id field
-UPDATE accounts
-SET credentials = credentials - 'tier_id'
-WHERE platform = 'gemini'
-  AND type = 'oauth'
-  AND credentials->>'tier_id' = 'LEGACY';
-- +goose StatementEnd
 ```

 ## Troubleshooting
@@ -194,5 +181,4 @@ VALUES ('NNN_migration.sql', 'calculated_checksum', NOW());
 ## References

 - Migration runner: `internal/repository/migrations_runner.go`
- Goose syntax: https://github.com/pressly/goose
 - PostgreSQL docs: https://www.postgresql.org/docs/
--- a/frontend/src/api/admin/dashboard.ts
+++ b/frontend/src/api/admin/dashboard.ts
@@ -81,6 +81,7 @@ export interface ModelStatsParams {
  user_id?: number
  api_key_id?: number
  model?: string
+  model_source?: 'requested' | 'upstream' | 'mapping'
  account_id?: number
  group_id?: number
  request_type?: UsageRequestType
@@ -162,6 +163,7 @@ export interface UserBreakdownParams {
  end_date?: string
  group_id?: number
  model?: string
+  model_source?: 'requested' | 'upstream' | 'mapping'
  endpoint?: string
  endpoint_type?: 'inbound' | 'upstream' | 'path'
  limit?: number
--- a/frontend/src/components/admin/usage/UsageTable.vue
+++ b/frontend/src/components/admin/usage/UsageTable.vue
@@ -25,8 +25,16 @@
          <span class="text-sm text-gray-900 dark:text-white">{{ row.account?.name || '-' }}</span>
        </template>

-        <template #cell-model="{ value }">
-          <span class="font-medium text-gray-900 dark:text-white">{{ value }}</span>
+        <template #cell-model="{ row }">
+          <div v-if="row.upstream_model && row.upstream_model !== row.model" class="space-y-0.5 text-xs">
+            <div class="break-all font-medium text-gray-900 dark:text-white">
+              {{ row.model }}
+            </div>
+            <div class="break-all text-gray-500 dark:text-gray-400">
+              <span class="mr-0.5">↳</span>{{ row.upstream_model }}
+            </div>
+          </div>
+          <span v-else class="font-medium text-gray-900 dark:text-white">{{ row.model }}</span>
        </template>

        <template #cell-reasoning_effort="{ row }">
--- a/frontend/src/components/charts/EndpointDistributionChart.vue
+++ b/frontend/src/components/charts/EndpointDistributionChart.vue
@@ -1,10 +1,10 @@
 <template>
  <div class="card p-4">
-    <div class="mb-4 flex items-start justify-between gap-3">
+    <div class="mb-4 flex items-center justify-between gap-3">
      <h3 class="text-sm font-semibold text-gray-900 dark:text-white">
        {{ title || t('usage.endpointDistribution') }}
      </h3>
-      <div class="flex flex-col items-end gap-2">
+      <div class="flex flex-wrap items-center justify-end gap-2">
        <div
          v-if="showSourceToggle"
          class="inline-flex rounded-lg border border-gray-200 bg-gray-50 p-0.5 dark:border-gray-700 dark:bg-dark-800"
--- a/frontend/src/components/charts/ModelDistributionChart.vue
+++ b/frontend/src/components/charts/ModelDistributionChart.vue
@@ -6,7 +6,42 @@
          ? t('admin.dashboard.modelDistribution')
          : t('admin.dashboard.spendingRankingTitle') }}
      </h3>
-      <div class="flex items-center gap-2">
+      <div class="flex flex-wrap items-center justify-end gap-2">
+        <div
+          v-if="showSourceToggle"
+          class="inline-flex rounded-lg border border-gray-200 bg-gray-50 p-0.5 dark:border-gray-700 dark:bg-dark-800"
+        >
+          <button
+            type="button"
+            class="rounded-md px-2.5 py-1 text-xs font-medium transition-colors"
+            :class="source === 'requested'
+              ? 'bg-white text-gray-900 shadow-sm dark:bg-dark-700 dark:text-white'
+              : 'text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200'"
+            @click="emit('update:source', 'requested')"
+          >
+            {{ t('usage.requestedModel') }}
+          </button>
+          <button
+            type="button"
+            class="rounded-md px-2.5 py-1 text-xs font-medium transition-colors"
+            :class="source === 'upstream'
+              ? 'bg-white text-gray-900 shadow-sm dark:bg-dark-700 dark:text-white'
+              : 'text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200'"
+            @click="emit('update:source', 'upstream')"
+          >
+            {{ t('usage.upstreamModel') }}
+          </button>
+          <button
+            type="button"
+            class="rounded-md px-2.5 py-1 text-xs font-medium transition-colors"
+            :class="source === 'mapping'
+              ? 'bg-white text-gray-900 shadow-sm dark:bg-dark-700 dark:text-white'
+              : 'text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200'"
+            @click="emit('update:source', 'mapping')"
+          >
+            {{ t('usage.mapping') }}
+          </button>
+        </div>
        <div
          v-if="showMetricToggle"
          class="inline-flex rounded-lg border border-gray-200 bg-gray-50 p-0.5 dark:border-gray-700 dark:bg-dark-800"
@@ -215,9 +250,13 @@ ChartJS.register(ArcElement, Tooltip, Legend)
 const { t } = useI18n()

 type DistributionMetric = 'tokens' | 'actual_cost'
+type ModelSource = 'requested' | 'upstream' | 'mapping'
 type RankingDisplayItem = UserSpendingRankingItem & { isOther?: boolean }
 const props = withDefaults(defineProps<{
  modelStats: ModelStat[]
+  upstreamModelStats?: ModelStat[]
+  mappingModelStats?: ModelStat[]
+  source?: ModelSource
  enableRankingView?: boolean
  rankingItems?: UserSpendingRankingItem[]
  rankingTotalActualCost?: number
@@ -225,12 +264,16 @@ const props = withDefaults(defineProps<{
  rankingTotalTokens?: number
  loading?: boolean
  metric?: DistributionMetric
+  showSourceToggle?: boolean
  showMetricToggle?: boolean
  rankingLoading?: boolean
  rankingError?: boolean
  startDate?: string
  endDate?: string
 }>(), {
+  upstreamModelStats: () => [],
+  mappingModelStats: () => [],
+  source: 'requested',
  enableRankingView: false,
  rankingItems: () => [],
  rankingTotalActualCost: 0,
@@ -238,6 +281,7 @@ const props = withDefaults(defineProps<{
  rankingTotalTokens: 0,
  loading: false,
  metric: 'tokens',
+  showSourceToggle: false,
  showMetricToggle: false,
  rankingLoading: false,
  rankingError: false
@@ -261,6 +305,7 @@ const toggleBreakdown = async (type: string, id: string) => {
      start_date: props.startDate,
      end_date: props.endDate,
      model: id,
+      model_source: props.source,
    })
    breakdownItems.value = res.users || []
  } catch {
@@ -272,6 +317,7 @@ const toggleBreakdown = async (type: string, id: string) => {

 const emit = defineEmits<{
  'update:metric': [value: DistributionMetric]
+  'update:source': [value: ModelSource]
  'ranking-click': [item: UserSpendingRankingItem]
 }>()

@@ -294,14 +340,19 @@ const chartColors = [
 ]

 const displayModelStats = computed(() => {
-  if (!props.modelStats?.length) return []
+  const sourceStats = props.source === 'upstream'
+    ? props.upstreamModelStats
+    : props.source === 'mapping'
+      ? props.mappingModelStats
+      : props.modelStats
+  if (!sourceStats?.length) return []

  const metricKey = props.metric === 'actual_cost' ? 'actual_cost' : 'total_tokens'
-  return [...props.modelStats].sort((a, b) => b[metricKey] - a[metricKey])
+  return [...sourceStats].sort((a, b) => b[metricKey] - a[metricKey])
 })

 const chartData = computed(() => {
-  if (!props.modelStats?.length) return null
+  if (!displayModelStats.value.length) return null

  return {
    labels: displayModelStats.value.map((m) => m.model),
--- a/frontend/src/i18n/locales/en.ts
+++ b/frontend/src/i18n/locales/en.ts
@@ -718,11 +718,14 @@ export default {
    exporting: 'Exporting...',
    preparingExport: 'Preparing export...',
    model: 'Model',
+    requestedModel: 'Requested',
+    upstreamModel: 'Upstream',
    reasoningEffort: 'Reasoning Effort',
    endpoint: 'Endpoint',
    endpointDistribution: 'Endpoint Distribution',
    inbound: 'Inbound',
    upstream: 'Upstream',
+    mapping: 'Mapping',
    path: 'Path',
    inboundEndpoint: 'Inbound Endpoint',
    upstreamEndpoint: 'Upstream Endpoint',
--- a/frontend/src/i18n/locales/zh.ts
+++ b/frontend/src/i18n/locales/zh.ts
@@ -723,11 +723,14 @@ export default {
    exporting: '导出中...',
    preparingExport: '正在准备导出...',
    model: '模型',
+    requestedModel: '请求',
+    upstreamModel: '上游',
    reasoningEffort: '推理强度',
    endpoint: '端点',
    endpointDistribution: '端点分布',
    inbound: '入站',
    upstream: '上游',
+    mapping: '映射',
    path: '路径',
    inboundEndpoint: '入站端点',
    upstreamEndpoint: '上游端点',
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -977,6 +977,7 @@ export interface UsageLog {
  account_id: number | null
  request_id: string
  model: string
+  upstream_model?: string | null
  service_tier?: string | null
  reasoning_effort?: string | null
  inbound_endpoint?: string | null
--- a/frontend/src/views/admin/UsageView.vue
+++ b/frontend/src/views/admin/UsageView.vue
@@ -24,9 +24,13 @@
        </div>
        <div class="grid grid-cols-1 gap-6 lg:grid-cols-2">
          <ModelDistributionChart
+            v-model:source="modelDistributionSource"
            v-model:metric="modelDistributionMetric"
-            :model-stats="modelStats"
-            :loading="chartsLoading"
+            :model-stats="requestedModelStats"
+            :upstream-model-stats="upstreamModelStats"
+            :mapping-model-stats="mappingModelStats"
+            :loading="modelStatsLoading"
+            :show-source-toggle="true"
            :show-metric-toggle="true"
            :start-date="startDate"
            :end-date="endDate"
@@ -115,7 +119,7 @@
 </template>

 <script setup lang="ts">
-import { ref, reactive, computed, onMounted, onUnmounted } from 'vue'
+import { ref, reactive, computed, onMounted, onUnmounted, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { saveAs } from 'file-saver'
 import { useRoute } from 'vue-router'
@@ -136,10 +140,17 @@ const { t } = useI18n()
 const appStore = useAppStore()
 type DistributionMetric = 'tokens' | 'actual_cost'
 type EndpointSource = 'inbound' | 'upstream' | 'path'
+type ModelDistributionSource = 'requested' | 'upstream' | 'mapping'
 const route = useRoute()
 const usageStats = ref<AdminUsageStatsResponse | null>(null); const usageLogs = ref<AdminUsageLog[]>([]); const loading = ref(false); const exporting = ref(false)
-const trendData = ref<TrendDataPoint[]>([]); const modelStats = ref<ModelStat[]>([]); const groupStats = ref<GroupStat[]>([]); const chartsLoading = ref(false); const granularity = ref<'day' | 'hour'>('hour')
+const trendData = ref<TrendDataPoint[]>([]); const requestedModelStats = ref<ModelStat[]>([]); const upstreamModelStats = ref<ModelStat[]>([]); const mappingModelStats = ref<ModelStat[]>([]); const groupStats = ref<GroupStat[]>([]); const chartsLoading = ref(false); const modelStatsLoading = ref(false); const granularity = ref<'day' | 'hour'>('hour')
 const modelDistributionMetric = ref<DistributionMetric>('tokens')
+const modelDistributionSource = ref<ModelDistributionSource>('requested')
+const loadedModelSources = reactive<Record<ModelDistributionSource, boolean>>({
+  requested: false,
+  upstream: false,
+  mapping: false,
+})
 const groupDistributionMetric = ref<DistributionMetric>('tokens')
 const endpointDistributionMetric = ref<DistributionMetric>('tokens')
 const endpointDistributionSource = ref<EndpointSource>('inbound')
@@ -150,6 +161,7 @@ const endpointStatsLoading = ref(false)
 let abortController: AbortController | null = null; let exportAbortController: AbortController | null = null
 let chartReqSeq = 0
 let statsReqSeq = 0
+let modelStatsReqSeq = 0
 const exportProgress = reactive({ show: false, progress: 0, current: 0, total: 0, estimatedTime: '' })
 const cleanupDialogVisible = ref(false)
 // Balance history modal state
@@ -269,6 +281,68 @@ const loadStats = async () => {
    if (seq === statsReqSeq) endpointStatsLoading.value = false
  }
 }
+
+const resetModelStatsCache = () => {
+  requestedModelStats.value = []
+  upstreamModelStats.value = []
+  mappingModelStats.value = []
+  loadedModelSources.requested = false
+  loadedModelSources.upstream = false
+  loadedModelSources.mapping = false
+}
+
+const loadModelStats = async (source: ModelDistributionSource, force = false) => {
+  if (!force && loadedModelSources[source]) {
+    return
+  }
+
+  const seq = ++modelStatsReqSeq
+  modelStatsLoading.value = true
+  try {
+    const requestType = filters.value.request_type
+    const legacyStream = requestType ? requestTypeToLegacyStream(requestType) : filters.value.stream
+    const baseParams = {
+      start_date: filters.value.start_date || startDate.value,
+      end_date: filters.value.end_date || endDate.value,
+      user_id: filters.value.user_id,
+      model: filters.value.model,
+      api_key_id: filters.value.api_key_id,
+      account_id: filters.value.account_id,
+      group_id: filters.value.group_id,
+      request_type: requestType,
+      stream: legacyStream === null ? undefined : legacyStream,
+      billing_type: filters.value.billing_type,
+    }
+
+    const response = await adminAPI.dashboard.getModelStats({ ...baseParams, model_source: source })
+
+    if (seq !== modelStatsReqSeq) return
+
+    const models = response.models || []
+    if (source === 'requested') {
+      requestedModelStats.value = models
+    } else if (source === 'upstream') {
+      upstreamModelStats.value = models
+    } else {
+      mappingModelStats.value = models
+    }
+    loadedModelSources[source] = true
+  } catch (error) {
+    if (seq !== modelStatsReqSeq) return
+    console.error('Failed to load model stats:', error)
+    if (source === 'requested') {
+      requestedModelStats.value = []
+    } else if (source === 'upstream') {
+      upstreamModelStats.value = []
+    } else {
+      mappingModelStats.value = []
+    }
+    loadedModelSources[source] = false
+  } finally {
+    if (seq === modelStatsReqSeq) modelStatsLoading.value = false
+  }
+}
+
 const loadChartData = async () => {
  const seq = ++chartReqSeq
  chartsLoading.value = true
@@ -289,18 +363,30 @@ const loadChartData = async () => {
      billing_type: filters.value.billing_type,
      include_stats: false,
      include_trend: true,
-      include_model_stats: true,
+      include_model_stats: false,
      include_group_stats: true,
      include_users_trend: false
    })
    if (seq !== chartReqSeq) return
    trendData.value = snapshot.trend || []
-    modelStats.value = snapshot.models || []
    groupStats.value = snapshot.groups || []
  } catch (error) { console.error('Failed to load chart data:', error) } finally { if (seq === chartReqSeq) chartsLoading.value = false }
 }
-const applyFilters = () => { pagination.page = 1; loadLogs(); loadStats(); loadChartData() }
-const refreshData = () => { loadLogs(); loadStats(); loadChartData() }
+const applyFilters = () => {
+  pagination.page = 1
+  resetModelStatsCache()
+  loadLogs()
+  loadStats()
+  loadModelStats(modelDistributionSource.value, true)
+  loadChartData()
+}
+const refreshData = () => {
+  resetModelStatsCache()
+  loadLogs()
+  loadStats()
+  loadModelStats(modelDistributionSource.value, true)
+  loadChartData()
+}
 const resetFilters = () => {
  const range = getLast24HoursRangeDates()
  startDate.value = range.start
@@ -329,7 +415,7 @@ const exportToExcel = async () => {
    const XLSX = await import('xlsx')
    const headers = [
      t('usage.time'), t('admin.usage.user'), t('usage.apiKeyFilter'),
-      t('admin.usage.account'), t('usage.model'), t('usage.reasoningEffort'), t('admin.usage.group'),
+      t('admin.usage.account'), t('usage.model'), t('usage.upstreamModel'), t('usage.reasoningEffort'), t('admin.usage.group'),
      t('usage.inboundEndpoint'), t('usage.upstreamEndpoint'),
      t('usage.type'),
      t('admin.usage.inputTokens'), t('admin.usage.outputTokens'),
@@ -348,7 +434,7 @@ const exportToExcel = async () => {
      if (c.signal.aborted) break; if (p === 1) { total = res.total; exportProgress.total = total }
      const rows = (res.items || []).map((log: AdminUsageLog) => [
        log.created_at, log.user?.email || '', log.api_key?.name || '', log.account?.name || '', log.model,
-        formatReasoningEffort(log.reasoning_effort), log.group?.name || '',
+        log.upstream_model || '', formatReasoningEffort(log.reasoning_effort), log.group?.name || '',
        log.inbound_endpoint || '', log.upstream_endpoint || '', getRequestTypeLabel(log),
        log.input_tokens, log.output_tokens, log.cache_read_tokens, log.cache_creation_tokens,
        log.input_cost?.toFixed(6) || '0.000000', log.output_cost?.toFixed(6) || '0.000000',
@@ -458,6 +544,7 @@ onMounted(() => {
  applyRouteQueryFilters()
  loadLogs()
  loadStats()
+  loadModelStats(modelDistributionSource.value, true)
  window.setTimeout(() => {
    void loadChartData()
  }, 120)
@@ -465,4 +552,8 @@ onMounted(() => {
  document.addEventListener('click', handleColumnClickOutside)
 })
 onUnmounted(() => { abortController?.abort(); exportAbortController?.abort(); document.removeEventListener('click', handleColumnClickOutside) })
+
+watch(modelDistributionSource, (source) => {
+  void loadModelStats(source)
+})
 </script>