题库导入功能完成，考试计划功能完成。

api/models/quiz.ts

@@ -142,13 +142,15 @@ export class QuizModel {
   }
 
   // 获取所有答题记录（管理员用）
-  static async findAllRecords(limit = 10, offset = 0): Promise<{ records: QuizRecord[]; total: number }> {
+  static async findAllRecords(limit = 10, offset = 0): Promise<{ records: any[]; total: number }> {
     const recordsSql = `
       SELECT r.id, r.user_id as userId, u.name as userName, u.phone as userPhone, 
              r.total_score as totalScore, r.correct_count as correctCount, r.total_count as totalCount, 
-             r.created_at as createdAt 
+             r.created_at as createdAt, r.subject_id as subjectId, s.name as subjectName,
+             r.task_id as taskId
       FROM quiz_records r 
       JOIN users u ON r.user_id = u.id 
+      LEFT JOIN exam_subjects s ON r.subject_id = s.id
       ORDER BY r.created_at DESC 
       LIMIT ? OFFSET ?
     `;
@@ -160,8 +162,29 @@ export class QuizModel {
       get(countSql)
     ]);
     
+    // 对于每条记录，计算该考试任务的参与人数
+    const processedRecords = await Promise.all(records.map(async (record) => {
+      let examCount = 0;
+      if (record.taskId) {
+        // 统计该任务的参与人数
+        const taskCountSql = `SELECT COUNT(DISTINCT user_id) as count FROM quiz_records WHERE task_id = ?`;
+        const taskCountResult = await get(taskCountSql, [record.taskId]);
+        examCount = taskCountResult.count || 0;
+      } else if (record.subjectId) {
+        // 统计该科目的参与人数
+        const subjectCountSql = `SELECT COUNT(DISTINCT user_id) as count FROM quiz_records WHERE subject_id = ?`;
+        const subjectCountResult = await get(subjectCountSql, [record.subjectId]);
+        examCount = subjectCountResult.count || 0;
+      }
+      
+      return {
+        ...record,
+        examCount
+      };
+    }));
+    
     return {
-      records,
+      records: processedRecords,
       total: countResult.total
     };
   }
@@ -215,7 +238,7 @@ export class QuizModel {
     averageScore: number;
     typeStats: Array<{ type: string; total: number; correct: number; correctRate: number }>;
   }> {
-    const totalUsersSql = `SELECT COUNT(DISTINCT user_id) as total FROM quiz_records`;
+    const totalUsersSql = `SELECT COUNT(*) as total FROM users`;
     const totalRecordsSql = `SELECT COUNT(*) as total FROM quiz_records`;
     const averageScoreSql = `SELECT AVG(total_score) as average FROM quiz_records`;