feat: 优化设备位置冲突检测和前端虚拟滚动

为设备表添加复合索引优化位置冲突检测性能
在设备位置检查中添加悲观锁防止竞态条件
添加 react-window 和 react-virtualized-auto-sizer 支持虚拟滚动

backend/models/Device.js

@@ -103,6 +103,9 @@ const Device = sequelize.define(
       { fields: ['createdAt'] },
       { fields: ['status', 'type'] },
       { fields: ['name'] },
+      // 优化位置冲突检测的复合索引
+      { fields: ['rackId', 'position'] },
+      { fields: ['rackId', 'position', 'isIdle'] },
     ],
   }
 );

backend/routes/devices.js

@@ -63,6 +63,8 @@ async function checkPositionAvailable(
 
   if (transaction) {
     queryOptions.transaction = transaction;
+    // 使用悲观锁防止竞态条件
+    queryOptions.lock = transaction.LOCK ? transaction.LOCK.UPDATE : 'UPDATE';
   }
 
   const existingDevices = await Device.findAll(queryOptions);
@@ -126,6 +128,8 @@ async function checkBatchPositions(rackId, devices, excludeDeviceIds = [], trans
 
   if (transaction) {
     queryOptions.transaction = transaction;
+    // 使用悲观锁防止竞态条件
+    queryOptions.lock = transaction.LOCK ? transaction.LOCK.UPDATE : 'UPDATE';
   }
 
   const existingDevices = await Device.findAll(queryOptions);

backend/routes/idleDevices.js

@@ -1033,6 +1033,8 @@ async function checkPositionAvailable(
 
   if (transaction) {
     queryOptions.transaction = transaction;
+    // 使用悲观锁防止竞态条件
+    queryOptions.lock = transaction.LOCK ? transaction.LOCK.UPDATE : 'UPDATE';
   }
 
   const existingDevices = await Device.findAll(queryOptions);

backend/scripts/migrate-all.js

@@ -95,6 +95,11 @@ const migrations = [
     description: '为 deviceFields 表添加 isSystem 字段，标记系统字段不可删除',
     migrate: migrateDeviceFieldsIsSystem,
   },
+  {
+    name: '设备位置索引优化',
+    description: '为 devices 表添加复合索引，优化位置冲突检测和悲观锁性能',
+    migrate: migrateDevicePositionIndexes,
+  },
 ];
 
 async function runMigrations() {
@@ -724,6 +729,48 @@ async function migrateIdleDeviceAndBusiness() {
   }
 }
 
+async function migrateDevicePositionIndexes() {
+  const dialect = sequelize.getDialect();
+  const tableName = 'devices';
+
+  if (!(await tableExists(tableName))) {
+    console.log(`    ${tableName} 表不存在，跳过`);
+    return;
+  }
+
+  console.log(`   → 为 ${tableName} 表添加复合索引 rackId_position...`);
+  try {
+    if (dialect === 'sqlite') {
+      await sequelize.query(`CREATE INDEX IF NOT EXISTS devices_rackId_position ON ${tableName}(rackId, position)`);
+    } else {
+      await sequelize.query(`CREATE INDEX IF NOT EXISTS \`devices_rackId_position\` ON \`${tableName}\`(\`rackId\`, \`position\`)`);
+    }
+    console.log('     ✓ 索引创建成功');
+  } catch (error) {
+    if (error.message.includes('already exists') || error.message.includes('Duplicate key name')) {
+      console.log('     → 索引已存在，跳过');
+    } else {
+      throw error;
+    }
+  }
+
+  console.log(`   → 为 ${tableName} 表添加复合索引 rackId_position_isIdle...`);
+  try {
+    if (dialect === 'sqlite') {
+      await sequelize.query(`CREATE INDEX IF NOT EXISTS devices_rackId_position_isIdle ON ${tableName}(rackId, position, isIdle)`);
+    } else {
+      await sequelize.query(`CREATE INDEX IF NOT EXISTS \`devices_rackId_position_isIdle\` ON \`${tableName}\`(\`rackId\`, \`position\`, \`isIdle\`)`);
+    }
+    console.log('     ✓ 索引创建成功');
+  } catch (error) {
+    if (error.message.includes('already exists') || error.message.includes('Duplicate key name')) {
+      console.log('     → 索引已存在，跳过');
+    } else {
+      throw error;
+    }
+  }
+}
+
 // 执行迁移
 runMigrations().catch(error => {
   console.error('迁移执行失败:', error);