fix: restore paper question grading sync

app/Services/ExamAnswerAnalysisService.php

@@ -1756,37 +1756,15 @@ class ExamAnswerAnalysisService
             $payloadsByQuestionId[$questionId] = $payload;
         }
 
-        if (! empty($payloadsByQuestionId)) {
-            $questionIds = array_keys($payloadsByQuestionId);
-            $paperQuestionRows = DB::connection('mysql')->table('paper_questions')
+        foreach ($payloadsByQuestionId as $questionId => $payload) {
+            // 生产 paper_questions.id 存在为空的历史数据，判分回写必须使用业务键匹配。
+            $updated += DB::connection('mysql')->table('paper_questions')
                 ->where('paper_id', $paperId)
-                ->where(function ($q) use ($questionIds) {
-                    $q->whereIn('question_bank_id', $questionIds)
-                        ->orWhereIn('question_id', $questionIds);
+                ->where(function ($q) use ($questionId) {
+                    $q->where('question_bank_id', $questionId)
+                        ->orWhere('question_id', $questionId);
                 })
-                ->get(['id', 'question_bank_id', 'question_id']);
-
-            $idsByQuestionId = [];
-            foreach ($paperQuestionRows as $row) {
-                foreach ([$row->question_bank_id ?? null, $row->question_id ?? null] as $candidateId) {
-                    $candidateId = (string) $candidateId;
-                    if ($candidateId === '' || ! isset($payloadsByQuestionId[$candidateId])) {
-                        continue;
-                    }
-                    $idsByQuestionId[$candidateId][] = $row->id;
-                }
-            }
-
-            foreach ($payloadsByQuestionId as $questionId => $payload) {
-                $rowIds = array_values(array_unique(array_filter($idsByQuestionId[$questionId] ?? [])));
-                if ($rowIds === []) {
-                    continue;
-                }
-
-                $updated += DB::connection('mysql')->table('paper_questions')
-                    ->whereIn('id', $rowIds)
-                    ->update($payload);
-            }
+                ->update($payload);
         }
 
         if ($updated > 0) {
@@ -1804,7 +1782,6 @@ class ExamAnswerAnalysisService
             'input_question_count' => count($examData['questions']),
             'processed_question_count' => count($processedQuestionIds),
             'updated_rows' => $updated,
-            'matched_rows' => isset($paperQuestionRows) ? $paperQuestionRows->count() : 0,
         ]);
     }