题库导入功能完成，考试计划功能完成。

api/models/question.ts

@@ -47,18 +47,43 @@ export class QuestionModel {
     return this.findById(id) as Promise<Question>;
   }
 
-  // 批量创建题目
+  // 批量创建题目 - 优化为使用事务批量插入
   static async createMany(questions: CreateQuestionData[]): Promise<{ success: number; errors: string[] }> {
     const errors: string[] = [];
     let success = 0;
     
-    for (let i = 0; i < questions.length; i++) {
-      try {
-        await this.create(questions[i]);
-        success++;
-      } catch (error: any) {
-        errors.push(`第${i + 1}题: ${error.message}`);
+    // 使用事务提高性能
+    try {
+      // 开始事务
+      await run('BEGIN TRANSACTION');
+      
+      const sql = `
+        INSERT INTO questions (id, content, type, options, answer, score, category) 
+        VALUES (?, ?, ?, ?, ?, ?, ?)
+      `;
+      
+      for (let i = 0; i < questions.length; i++) {
+        try {
+          const question = questions[i];
+          const id = uuidv4();
+          const optionsStr = question.options ? JSON.stringify(question.options) : null;
+          const answerStr = Array.isArray(question.answer) ? JSON.stringify(question.answer) : question.answer;
+          const category = question.category && question.category.trim() ? question.category.trim() : '通用';
+          
+          // 直接执行插入，不调用单个create方法
+          await run(sql, [id, question.content, question.type, optionsStr, answerStr, question.score, category]);
+          success++;
+        } catch (error: any) {
+          errors.push(`第${i + 1}题: ${error.message}`);
+        }
       }
+      
+      // 提交事务
+      await run('COMMIT');
+    } catch (error: any) {
+      // 回滚事务
+      await run('ROLLBACK');
+      errors.push(`事务错误: ${error.message}`);
     }
     
     return { success, errors };