合并

database/migrations/2020_03_25_164322_create_user_duty_checks_table.php

@@ -18,7 +18,7 @@ class CreateUserDutyChecksTable extends Migration
         Schema::create('user_duty_checks', function (Blueprint $table) {
             $table->bigIncrements('id');
             $table->bigInteger('user_id')->index()->comment('外键用户');
-            $table->timestamp('checked_at')->index()->comment('打卡时间');
+            $table->timestamp('checked_at')->index()->comment('打卡时间')->default(null);
             $table->bigInteger('verify_user_id')->nullable()->comment('外键用户(确认人)');
             $table->enum('type',['无','登出','登入'])->default('无')->comment('打卡类型');
             $table->enum('source',['正常','补入'])->default('正常')->comment('来源');