基本功能完成，下一步开始美化UI

api/database/index.ts

@@ -1,6 +1,7 @@
 import sqlite3 from 'sqlite3';
 import path from 'path';
 import fs from 'fs';
+import { v4 as uuidv4 } from 'uuid';
 
 const DEFAULT_DB_DIR = path.join(process.cwd(), 'data');
 const DEFAULT_DB_PATH = path.join(DEFAULT_DB_DIR, 'survey.db');
@@ -127,6 +128,65 @@ const migrateDatabase = async () => {
   await ensureIndex(`CREATE INDEX IF NOT EXISTS idx_exam_task_users_user_id ON exam_task_users(user_id);`);
   await ensureIndex(`CREATE INDEX IF NOT EXISTS idx_quiz_records_subject_id ON quiz_records(subject_id);`);
   await ensureIndex(`CREATE INDEX IF NOT EXISTS idx_quiz_records_task_id ON quiz_records(task_id);`);
+
+  // 1. 创建用户组表
+  await ensureTable(`
+    CREATE TABLE IF NOT EXISTS user_groups (
+      id TEXT PRIMARY KEY,
+      name TEXT UNIQUE NOT NULL,
+      description TEXT,
+      is_system BOOLEAN DEFAULT 0,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+    );
+  `);
+
+  // 2. 创建用户-用户组关联表
+  await ensureTable(`
+    CREATE TABLE IF NOT EXISTS user_group_members (
+      group_id TEXT NOT NULL,
+      user_id TEXT NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      PRIMARY KEY (group_id, user_id),
+      FOREIGN KEY (group_id) REFERENCES user_groups(id) ON DELETE CASCADE,
+      FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    );
+  `);
+
+  // 3. 为考试任务表添加选择配置字段
+  await ensureColumn('exam_tasks', 'selection_config TEXT', 'selection_config');
+
+  // 4. 初始化"全体用户"组
+  const allUsersGroup = await get(`SELECT id FROM user_groups WHERE is_system = 1`);
+  let allUsersGroupId = allUsersGroup?.id;
+
+  if (!allUsersGroupId) {
+    allUsersGroupId = uuidv4();
+    await run(
+      `INSERT INTO user_groups (id, name, description, is_system) VALUES (?, ?, ?, ?)`,
+      [allUsersGroupId, '全体用户', '包含系统所有用户的默认组', 1]
+    );
+    console.log('已创建"全体用户"系统组');
+  }
+
+  // 5. 将现有用户添加到"全体用户"组
+  if (allUsersGroupId) {
+    // 找出尚未在全体用户组中的用户
+    const usersNotInGroup = await query(`
+      SELECT id FROM users 
+      WHERE id NOT IN (
+        SELECT user_id FROM user_group_members WHERE group_id = ?
+      )
+    `, [allUsersGroupId]);
+
+    if (usersNotInGroup.length > 0) {
+      const stmt = db.prepare(`INSERT INTO user_group_members (group_id, user_id) VALUES (?, ?)`);
+      usersNotInGroup.forEach(user => {
+        stmt.run(allUsersGroupId, user.id);
+      });
+      stmt.finalize();
+      console.log(`已将 ${usersNotInGroup.length} 名现有用户添加到"全体用户"组`);
+    }
+  }
 };
 
 // 数据库初始化函数