fix: record zero OpenAI usage logs

backend/internal/service/openai_gateway_403_reset_test.go

@@ -20,20 +20,29 @@ func (s *openAI403CounterResetStub) ResetOpenAI403Count(_ context.Context, accou
 	return nil
 }
 
-func TestOpenAIGatewayServiceRecordUsage_ResetsOpenAI403CounterBeforeZeroUsageReturn(t *testing.T) {
+func TestOpenAIGatewayServiceRecordUsage_ResetsOpenAI403CounterForZeroUsage(t *testing.T) {
 	counter := &openAI403CounterResetStub{}
 	rateLimitSvc := NewRateLimitService(nil, nil, nil, nil, nil)
 	rateLimitSvc.SetOpenAI403CounterCache(counter)
 
-	svc := &OpenAIGatewayService{
-		rateLimitService: rateLimitSvc,
-	}
+	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
+	billingRepo := &openAIRecordUsageBillingRepoStub{result: &UsageBillingApplyResult{Applied: true}}
+	userRepo := &openAIRecordUsageUserRepoStub{}
+	subRepo := &openAIRecordUsageSubRepoStub{}
+	svc := newOpenAIRecordUsageServiceWithBillingRepoForTest(usageRepo, billingRepo, userRepo, subRepo, nil)
+	svc.rateLimitService = rateLimitSvc
 
 	err := svc.RecordUsage(context.Background(), &OpenAIRecordUsageInput{
-		Result:  &OpenAIForwardResult{},
+		Result: &OpenAIForwardResult{
+			RequestID: "resp_zero_usage_reset_403",
+			Model:     "gpt-5.1",
+		},
+		APIKey:  &APIKey{ID: 1001, Group: &Group{RateMultiplier: 1}},
+		User:    &User{ID: 2001},
 		Account: &Account{ID: 777, Platform: PlatformOpenAI},
 	})
 
 	require.NoError(t, err)
 	require.Equal(t, []int64{777}, counter.resetCalls)
+	require.Equal(t, 1, usageRepo.calls)
 }