diff --git a/backend/internal/service/token_refresh_service.go b/backend/internal/service/token_refresh_service.go
index 7c66faea89..13bdae3269 100644
--- a/backend/internal/service/token_refresh_service.go
+++ b/backend/internal/service/token_refresh_service.go
@@ -12,12 +12,8 @@ import (
 	"github.com/Wei-Shaw/sub2api/internal/config"
 )
 
-const (
-	// tokenRefreshTempUnschedDuration token 刷新重试耗尽后临时不可调度的持续时间
-	tokenRefreshTempUnschedDuration = 10 * time.Minute
-
-	tokenRefreshRetryExhaustedReasonPrefix = "token refresh retry exhausted:"
-)
+// tokenRefreshTempUnschedDuration token 刷新重试耗尽后临时不可调度的持续时间
+const tokenRefreshTempUnschedDuration = 10 * time.Minute
 
 // TokenRefreshService OAuth token自动刷新服务
 // 定期检查并刷新即将过期的token
@@ -342,7 +338,7 @@ func (s *TokenRefreshService) refreshWithRetry(ctx context.Context, account *Acc
 
 	// 设置临时不可调度 10 分钟（不标记 error，保持 status=active 让下个刷新周期能继续尝试）
 	until := time.Now().Add(tokenRefreshTempUnschedDuration)
-	reason := fmt.Sprintf("%s %v", tokenRefreshRetryExhaustedReasonPrefix, lastErr)
+	reason := fmt.Sprintf("token refresh retry exhausted: %v", lastErr)
 	s.notifyAccountSchedulingBlocked(account, until, "token_refresh_retry_exhausted")
 	if setErr := s.accountRepo.SetTempUnschedulable(ctx, account.ID, until, reason); setErr != nil {
 		slog.Warn("token_refresh.set_temp_unschedulable_failed",
diff --git a/backend/internal/service/token_refresh_service_candidates_test.go b/backend/internal/service/token_refresh_service_candidates_test.go
index fc5fc9ddbc..ec827e4b65 100644
--- a/backend/internal/service/token_refresh_service_candidates_test.go
+++ b/backend/internal/service/token_refresh_service_candidates_test.go
@@ -34,7 +34,7 @@ func (r *tokenRefreshCandidateRepo) ListOAuthRefreshCandidates(context.Context)
 		refreshToken, _ := account.Credentials["refresh_token"].(string)
 		inRetryCooldown := account.TempUnschedulableUntil != nil &&
 			account.TempUnschedulableUntil.After(now) &&
-			strings.HasPrefix(account.TempUnschedulableReason, tokenRefreshRetryExhaustedReasonPrefix)
+			strings.HasPrefix(account.TempUnschedulableReason, "token refresh retry exhausted:")
 		if account.Status != StatusActive ||
 			account.Type != AccountTypeOAuth ||
 			!isOAuthRefreshPlatform(account.Platform) ||
@@ -119,7 +119,7 @@ func TestTokenRefreshService_ProcessRefreshUsesOAuthRefreshCandidates(t *testing
 				Status:                  StatusActive,
 				Credentials:             map[string]any{"refresh_token": "refresh-token"},
 				TempUnschedulableUntil:  &future,
-				TempUnschedulableReason: tokenRefreshRetryExhaustedReasonPrefix + " network timeout",
+				TempUnschedulableReason: "token refresh retry exhausted: network timeout",
 			},
 			{
 				ID:          5,
@@ -183,7 +183,7 @@ func TestTokenRefreshService_RefreshFailureDoesNotCallPrivacy(t *testing.T) {
 			} else {
 				require.Zero(t, repo.setErrorCalls)
 				require.Equal(t, 1, repo.setTempUnschedCalls)
-				require.True(t, strings.HasPrefix(repo.lastTempUnschedReason, tokenRefreshRetryExhaustedReasonPrefix))
+				require.True(t, strings.HasPrefix(repo.lastTempUnschedReason, "token refresh retry exhausted:"))
 			}
 		})
 	}