remove mock group stats endpoint

backend/internal/handler/admin/admin_basic_handlers_test.go

@@ -36,7 +36,6 @@ func setupAdminRouter() (*gin.Engine, *stubAdminService) {
 	router.POST("/api/v1/admin/groups", groupHandler.Create)
 	router.PUT("/api/v1/admin/groups/:id", groupHandler.Update)
 	router.DELETE("/api/v1/admin/groups/:id", groupHandler.Delete)
-	router.GET("/api/v1/admin/groups/:id/stats", groupHandler.GetStats)
 	router.GET("/api/v1/admin/groups/:id/api-keys", groupHandler.GetGroupAPIKeys)
 
 	router.GET("/api/v1/admin/proxies", proxyHandler.List)
@@ -147,7 +146,7 @@ func TestGroupHandlerEndpoints(t *testing.T) {
 	rec = httptest.NewRecorder()
 	req = httptest.NewRequest(http.MethodGet, "/api/v1/admin/groups/2/stats", nil)
 	router.ServeHTTP(rec, req)
-	require.Equal(t, http.StatusOK, rec.Code)
+	require.Equal(t, http.StatusNotFound, rec.Code)
 
 	rec = httptest.NewRecorder()
 	req = httptest.NewRequest(http.MethodGet, "/api/v1/admin/groups/2/api-keys", nil)
@@ -279,6 +278,10 @@ func TestDeprecatedMockAdminEndpointsNotRegistered(t *testing.T) {
 		name string
 		url  string
 	}{
+		{
+			name: "group stats",
+			url:  "/api/v1/admin/groups/2/stats",
+		},
 		{
 			name: "user usage",
 			url:  "/api/v1/admin/users/1/usage?period=today",