diff --git a/app/Services/BaccaratPredictionService.php b/app/Services/BaccaratPredictionService.php
index 3ae5ab9..1bd9f8e 100644
--- a/app/Services/BaccaratPredictionService.php
+++ b/app/Services/BaccaratPredictionService.php
@@ -61,8 +61,9 @@ class BaccaratPredictionService
         // 将首选模型提到队列最前（若存在）
         $preferred = $providers->firstWhere('model', self::PREFERRED_MODEL);
         if ($preferred) {
-            $providers = $providers->reject(fn ($p) => $p->model === self::PREFERRED_MODEL)
-                ->prepend($preferred);
+            $providers = $providers->reject(fn (AiProviderConfig $p) => $p->model === self::PREFERRED_MODEL)
+                ->prepend($preferred)
+                ->values(); // 重置索引，消除 IDE 类型推断警告
         }
 
         $prompt = $this->buildPredictionPrompt($recentResults);
@@ -247,7 +248,7 @@ PROMPT;
     ): void {
         try {
             AiUsageLog::create([
-                'user_id' => 0, // AI 系统行为，无对应用户
+                'user_id' => null, // AI 系统行为，无对应用户
                 'provider' => $config->provider,
                 'model' => $config->model,
                 'action' => 'baccarat_predict',