diff --git a/backend/internal/server/api_contract_test.go b/backend/internal/server/api_contract_test.go
index 414f15416f..7b45b27895 100644
--- a/backend/internal/server/api_contract_test.go
+++ b/backend/internal/server/api_contract_test.go
@@ -317,6 +317,7 @@ func TestAPIContracts(t *testing.T) {
 						Description:         "desc",
 						Platform:            service.PlatformAnthropic,
 						RateMultiplier:      1.5,
+						PeakRateMultiplier:  1.0,
 						IsExclusive:         false,
 						Status:              service.StatusActive,
 						SubscriptionType:    service.SubscriptionTypeStandard,
@@ -347,7 +348,7 @@ func TestAPIContracts(t *testing.T) {
 						"peak_rate_enabled": false,
 						"peak_start": "",
 						"peak_end": "",
-						"peak_rate_multiplier": 0,
+						"peak_rate_multiplier": 1,
 						"is_exclusive": false,
 						"status": "active",
 						"subscription_type": "standard",
diff --git a/backend/internal/service/admin_service_peak_rate_test.go b/backend/internal/service/admin_service_peak_rate_test.go
deleted file mode 100644
index 87f6f497b1..0000000000
--- a/backend/internal/service/admin_service_peak_rate_test.go
+++ /dev/null
@@ -1,106 +0,0 @@
-package service
-
-import (
-	"context"
-	"testing"
-
-	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
-	"github.com/stretchr/testify/require"
-)
-
-type peakRateGroupRepoStub struct {
-	getByID *Group
-	updated *Group
-}
-
-func (s *peakRateGroupRepoStub) Create(context.Context, *Group) error {
-	panic("unexpected Create call")
-}
-
-func (s *peakRateGroupRepoStub) GetByID(context.Context, int64) (*Group, error) {
-	return s.getByID, nil
-}
-
-func (s *peakRateGroupRepoStub) GetByIDLite(context.Context, int64) (*Group, error) {
-	return s.getByID, nil
-}
-
-func (s *peakRateGroupRepoStub) Update(_ context.Context, group *Group) error {
-	s.updated = group
-	return nil
-}
-
-func (s *peakRateGroupRepoStub) Delete(context.Context, int64) error {
-	panic("unexpected Delete call")
-}
-
-func (s *peakRateGroupRepoStub) DeleteCascade(context.Context, int64) ([]int64, error) {
-	panic("unexpected DeleteCascade call")
-}
-
-func (s *peakRateGroupRepoStub) List(context.Context, pagination.PaginationParams) ([]Group, *pagination.PaginationResult, error) {
-	panic("unexpected List call")
-}
-
-func (s *peakRateGroupRepoStub) ListWithFilters(context.Context, pagination.PaginationParams, string, string, string, *bool) ([]Group, *pagination.PaginationResult, error) {
-	panic("unexpected ListWithFilters call")
-}
-
-func (s *peakRateGroupRepoStub) ListActive(context.Context) ([]Group, error) {
-	panic("unexpected ListActive call")
-}
-
-func (s *peakRateGroupRepoStub) ListActiveByPlatform(context.Context, string) ([]Group, error) {
-	panic("unexpected ListActiveByPlatform call")
-}
-
-func (s *peakRateGroupRepoStub) ExistsByName(context.Context, string) (bool, error) {
-	panic("unexpected ExistsByName call")
-}
-
-func (s *peakRateGroupRepoStub) GetAccountCount(context.Context, int64) (int64, int64, error) {
-	panic("unexpected GetAccountCount call")
-}
-
-func (s *peakRateGroupRepoStub) DeleteAccountGroupsByGroupID(context.Context, int64) (int64, error) {
-	panic("unexpected DeleteAccountGroupsByGroupID call")
-}
-
-func (s *peakRateGroupRepoStub) GetAccountIDsByGroupIDs(context.Context, []int64) ([]int64, error) {
-	panic("unexpected GetAccountIDsByGroupIDs call")
-}
-
-func (s *peakRateGroupRepoStub) BindAccountsToGroup(context.Context, int64, []int64) error {
-	panic("unexpected BindAccountsToGroup call")
-}
-
-func (s *peakRateGroupRepoStub) UpdateSortOrders(context.Context, []GroupSortOrderUpdate) error {
-	panic("unexpected UpdateSortOrders call")
-}
-
-func TestAdminService_UpdateGroup_ClearsPeakRateWhenChangingToStandardDefault(t *testing.T) {
-	repo := &peakRateGroupRepoStub{getByID: &Group{
-		ID:                 1,
-		Name:               "existing-group",
-		Platform:           PlatformOpenAI,
-		Status:             StatusActive,
-		SubscriptionType:   SubscriptionTypeSubscription,
-		PeakRateEnabled:    true,
-		PeakStart:          "14:00",
-		PeakEnd:            "18:00",
-		PeakRateMultiplier: 3,
-	}}
-	svc := &adminServiceImpl{groupRepo: repo}
-
-	group, err := svc.UpdateGroup(context.Background(), 1, &UpdateGroupInput{
-		SubscriptionType: SubscriptionTypeStandard,
-	})
-	require.NoError(t, err)
-	require.NotNil(t, group)
-	require.NotNil(t, repo.updated)
-	require.Equal(t, SubscriptionTypeStandard, repo.updated.SubscriptionType)
-	require.False(t, repo.updated.PeakRateEnabled)
-	require.Equal(t, "", repo.updated.PeakStart)
-	require.Equal(t, "", repo.updated.PeakEnd)
-	require.Equal(t, 1.0, repo.updated.PeakRateMultiplier)
-}