任务列表刷新更新后台已发送数据;渠道多选和随机获取

src/task/entities/task.entity.ts

@@ -52,6 +52,6 @@ export class Task {
     @Column({ default: 0 })
     requestNumberInterval: number
 
-    @Column({ nullable: false })
+    @Column({ nullable: true })
     channelId: string
 }