diff --git a/_ide_helper.php b/_ide_helper.php
index a47ba85..e2cddaa 100644
--- a/_ide_helper.php
+++ b/_ide_helper.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * A helper file for Laravel 5, to provide autocomplete information to your IDE
- * Generated for Laravel 5.5.3 on 2017-09-22.
+ * Generated for Laravel 5.5.3 on 2018-08-23.
  *
  * @author Barry vd. Heuvel <barryvdh@gmail.com>
  * @see https://github.com/barryvdh/laravel-ide-helper
@@ -2209,118 +2209,6 @@ public static function compileEchoDefaults($value)
          
     }
 
-    class Broadcast {
-        
-        /**
-         * Register the routes for handling broadcast authentication and sockets.
-         *
-         * @param array|null $attributes
-         * @return void 
-         * @static 
-         */ 
-        public static function routes($attributes = null)
-        {
-            \Illuminate\Broadcasting\BroadcastManager::routes($attributes);
-        }
-        
-        /**
-         * Get the socket ID for the given request.
-         *
-         * @param \Illuminate\Http\Request|null $request
-         * @return string|null 
-         * @static 
-         */ 
-        public static function socket($request = null)
-        {
-            return \Illuminate\Broadcasting\BroadcastManager::socket($request);
-        }
-        
-        /**
-         * Begin broadcasting an event.
-         *
-         * @param mixed|null $event
-         * @return \Illuminate\Broadcasting\PendingBroadcast|void 
-         * @static 
-         */ 
-        public static function event($event = null)
-        {
-            return \Illuminate\Broadcasting\BroadcastManager::event($event);
-        }
-        
-        /**
-         * Queue the given event for broadcast.
-         *
-         * @param mixed $event
-         * @return void 
-         * @static 
-         */ 
-        public static function queue($event)
-        {
-            \Illuminate\Broadcasting\BroadcastManager::queue($event);
-        }
-        
-        /**
-         * Get a driver instance.
-         *
-         * @param string $driver
-         * @return mixed 
-         * @static 
-         */ 
-        public static function connection($driver = null)
-        {
-            return \Illuminate\Broadcasting\BroadcastManager::connection($driver);
-        }
-        
-        /**
-         * Get a driver instance.
-         *
-         * @param string $name
-         * @return mixed 
-         * @static 
-         */ 
-        public static function driver($name = null)
-        {
-            return \Illuminate\Broadcasting\BroadcastManager::driver($name);
-        }
-        
-        /**
-         * Get the default driver name.
-         *
-         * @return string 
-         * @static 
-         */ 
-        public static function getDefaultDriver()
-        {
-            return \Illuminate\Broadcasting\BroadcastManager::getDefaultDriver();
-        }
-        
-        /**
-         * Set the default driver name.
-         *
-         * @param string $name
-         * @return void 
-         * @static 
-         */ 
-        public static function setDefaultDriver($name)
-        {
-            \Illuminate\Broadcasting\BroadcastManager::setDefaultDriver($name);
-        }
-        
-        /**
-         * Register a custom driver creator Closure.
-         *
-         * @param string $driver
-         * @param \Closure $callback
-         * @return $this 
-         * @static 
-         */ 
-        public static function extend($driver, $callback)
-        {
-            return \Illuminate\Broadcasting\BroadcastManager::extend($driver, $callback);
-        }
-         
-    }
-
     class Bus {
         
         /**
@@ -5699,445 +5587,6 @@ public static function setEventDispatcher($dispatcher)
          
     }
 
-    class Mail {
-        
-        /**
-         * Set the global from address and name.
-         *
-         * @param string $address
-         * @param string|null $name
-         * @return void 
-         * @static 
-         */ 
-        public static function alwaysFrom($address, $name = null)
-        {
-            \Illuminate\Mail\Mailer::alwaysFrom($address, $name);
-        }
-        
-        /**
-         * Set the global reply-to address and name.
-         *
-         * @param string $address
-         * @param string|null $name
-         * @return void 
-         * @static 
-         */ 
-        public static function alwaysReplyTo($address, $name = null)
-        {
-            \Illuminate\Mail\Mailer::alwaysReplyTo($address, $name);
-        }
-        
-        /**
-         * Set the global to address and name.
-         *
-         * @param string $address
-         * @param string|null $name
-         * @return void 
-         * @static 
-         */ 
-        public static function alwaysTo($address, $name = null)
-        {
-            \Illuminate\Mail\Mailer::alwaysTo($address, $name);
-        }
-        
-        /**
-         * Begin the process of mailing a mailable class instance.
-         *
-         * @param mixed $users
-         * @return \Illuminate\Mail\PendingMail 
-         * @static 
-         */ 
-        public static function to($users)
-        {
-            return \Illuminate\Mail\Mailer::to($users);
-        }
-        
-        /**
-         * Begin the process of mailing a mailable class instance.
-         *
-         * @param mixed $users
-         * @return \Illuminate\Mail\PendingMail 
-         * @static 
-         */ 
-        public static function bcc($users)
-        {
-            return \Illuminate\Mail\Mailer::bcc($users);
-        }
-        
-        /**
-         * Send a new message when only a raw text part.
-         *
-         * @param string $text
-         * @param mixed $callback
-         * @return void 
-         * @static 
-         */ 
-        public static function raw($text, $callback)
-        {
-            \Illuminate\Mail\Mailer::raw($text, $callback);
-        }
-        
-        /**
-         * Send a new message when only a plain part.
-         *
-         * @param string $view
-         * @param array $data
-         * @param mixed $callback
-         * @return void 
-         * @static 
-         */ 
-        public static function plain($view, $data, $callback)
-        {
-            \Illuminate\Mail\Mailer::plain($view, $data, $callback);
-        }
-        
-        /**
-         * Render the given message as a view.
-         *
-         * @param string|array $view
-         * @param array $data
-         * @return \Illuminate\View\View 
-         * @static 
-         */ 
-        public static function render($view, $data = array())
-        {
-            return \Illuminate\Mail\Mailer::render($view, $data);
-        }
-        
-        /**
-         * Send a new message using a view.
-         *
-         * @param string|array|\Illuminate\Mail\MailableContract $view
-         * @param array $data
-         * @param \Closure|string $callback
-         * @return void 
-         * @static 
-         */ 
-        public static function send($view, $data = array(), $callback = null)
-        {
-            \Illuminate\Mail\Mailer::send($view, $data, $callback);
-        }
-        
-        /**
-         * Queue a new e-mail message for sending.
-         *
-         * @param string|array|\Illuminate\Mail\MailableContract $view
-         * @param string|null $queue
-         * @return mixed 
-         * @static 
-         */ 
-        public static function queue($view, $queue = null)
-        {
-            return \Illuminate\Mail\Mailer::queue($view, $queue);
-        }
-        
-        /**
-         * Queue a new e-mail message for sending on the given queue.
-         *
-         * @param string $queue
-         * @param string|array $view
-         * @return mixed 
-         * @static 
-         */ 
-        public static function onQueue($queue, $view)
-        {
-            return \Illuminate\Mail\Mailer::onQueue($queue, $view);
-        }
-        
-        /**
-         * Queue a new e-mail message for sending on the given queue.
-         * 
-         * This method didn't match rest of framework's "onQueue" phrasing. Added "onQueue".
-         *
-         * @param string $queue
-         * @param string|array $view
-         * @return mixed 
-         * @static 
-         */ 
-        public static function queueOn($queue, $view)
-        {
-            return \Illuminate\Mail\Mailer::queueOn($queue, $view);
-        }
-        
-        /**
-         * Queue a new e-mail message for sending after (n) seconds.
-         *
-         * @param \DateTimeInterface|\DateInterval|int $delay
-         * @param string|array|\Illuminate\Mail\MailableContract $view
-         * @param string|null $queue
-         * @return mixed 
-         * @static 
-         */ 
-        public static function later($delay, $view, $queue = null)
-        {
-            return \Illuminate\Mail\Mailer::later($delay, $view, $queue);
-        }
-        
-        /**
-         * Queue a new e-mail message for sending after (n) seconds on the given queue.
-         *
-         * @param string $queue
-         * @param \DateTimeInterface|\DateInterval|int $delay
-         * @param string|array $view
-         * @return mixed 
-         * @static 
-         */ 
-        public static function laterOn($queue, $delay, $view)
-        {
-            return \Illuminate\Mail\Mailer::laterOn($queue, $delay, $view);
-        }
-        
-        /**
-         * Get the view factory instance.
-         *
-         * @return \Illuminate\Contracts\View\Factory 
-         * @static 
-         */ 
-        public static function getViewFactory()
-        {
-            return \Illuminate\Mail\Mailer::getViewFactory();
-        }
-        
-        /**
-         * Get the Swift Mailer instance.
-         *
-         * @return \Swift_Mailer 
-         * @static 
-         */ 
-        public static function getSwiftMailer()
-        {
-            return \Illuminate\Mail\Mailer::getSwiftMailer();
-        }
-        
-        /**
-         * Get the array of failed recipients.
-         *
-         * @return array 
-         * @static 
-         */ 
-        public static function failures()
-        {
-            return \Illuminate\Mail\Mailer::failures();
-        }
-        
-        /**
-         * Set the Swift Mailer instance.
-         *
-         * @param \Swift_Mailer $swift
-         * @return void 
-         * @static 
-         */ 
-        public static function setSwiftMailer($swift)
-        {
-            \Illuminate\Mail\Mailer::setSwiftMailer($swift);
-        }
-        
-        /**
-         * Set the queue manager instance.
-         *
-         * @param \Illuminate\Contracts\Queue\Factory $queue
-         * @return $this 
-         * @static 
-         */ 
-        public static function setQueue($queue)
-        {
-            return \Illuminate\Mail\Mailer::setQueue($queue);
-        }
-        
-        /**
-         * Register a custom macro.
-         *
-         * @param string $name
-         * @param object|callable $macro
-         * @return void 
-         * @static 
-         */ 
-        public static function macro($name, $macro)
-        {
-            \Illuminate\Mail\Mailer::macro($name, $macro);
-        }
-        
-        /**
-         * Mix another object into the class.
-         *
-         * @param object $mixin
-         * @return void 
-         * @static 
-         */ 
-        public static function mixin($mixin)
-        {
-            \Illuminate\Mail\Mailer::mixin($mixin);
-        }
-        
-        /**
-         * Checks if macro is registered.
-         *
-         * @param string $name
-         * @return bool 
-         * @static 
-         */ 
-        public static function hasMacro($name)
-        {
-            return \Illuminate\Mail\Mailer::hasMacro($name);
-        }
-         
-    }
-
-    class Notification {
-        
-        /**
-         * Send the given notification to the given notifiable entities.
-         *
-         * @param \Illuminate\Support\Collection|array|mixed $notifiables
-         * @param mixed $notification
-         * @return void 
-         * @static 
-         */ 
-        public static function send($notifiables, $notification)
-        {
-            \Illuminate\Notifications\ChannelManager::send($notifiables, $notification);
-        }
-        
-        /**
-         * Send the given notification immediately.
-         *
-         * @param \Illuminate\Support\Collection|array|mixed $notifiables
-         * @param mixed $notification
-         * @param array|null $channels
-         * @return void 
-         * @static 
-         */ 
-        public static function sendNow($notifiables, $notification, $channels = null)
-        {
-            \Illuminate\Notifications\ChannelManager::sendNow($notifiables, $notification, $channels);
-        }
-        
-        /**
-         * Get a channel instance.
-         *
-         * @param string|null $name
-         * @return mixed 
-         * @static 
-         */ 
-        public static function channel($name = null)
-        {
-            return \Illuminate\Notifications\ChannelManager::channel($name);
-        }
-        
-        /**
-         * Get the default channel driver name.
-         *
-         * @return string 
-         * @static 
-         */ 
-        public static function getDefaultDriver()
-        {
-            return \Illuminate\Notifications\ChannelManager::getDefaultDriver();
-        }
-        
-        /**
-         * Get the default channel driver name.
-         *
-         * @return string 
-         * @static 
-         */ 
-        public static function deliversVia()
-        {
-            return \Illuminate\Notifications\ChannelManager::deliversVia();
-        }
-        
-        /**
-         * Set the default channel driver name.
-         *
-         * @param string $channel
-         * @return void 
-         * @static 
-         */ 
-        public static function deliverVia($channel)
-        {
-            \Illuminate\Notifications\ChannelManager::deliverVia($channel);
-        }
-        
-        /**
-         * Get a driver instance.
-         *
-         * @param string $driver
-         * @return mixed 
-         * @static 
-         */ 
-        public static function driver($driver = null)
-        {
-            //Method inherited from \Illuminate\Support\Manager            
-            return \Illuminate\Notifications\ChannelManager::driver($driver);
-        }
-        
-        /**
-         * Register a custom driver creator Closure.
-         *
-         * @param string $driver
-         * @param \Closure $callback
-         * @return $this 
-         * @static 
-         */ 
-        public static function extend($driver, $callback)
-        {
-            //Method inherited from \Illuminate\Support\Manager            
-            return \Illuminate\Notifications\ChannelManager::extend($driver, $callback);
-        }
-        
-        /**
-         * Get all of the created "drivers".
-         *
-         * @return array 
-         * @static 
-         */ 
-        public static function getDrivers()
-        {
-            //Method inherited from \Illuminate\Support\Manager            
-            return \Illuminate\Notifications\ChannelManager::getDrivers();
-        }
-         
-    }
-
-    class Password {
-        
-        /**
-         * Attempt to get the broker from the local cache.
-         *
-         * @param string $name
-         * @return \Illuminate\Contracts\Auth\PasswordBroker 
-         * @static 
-         */ 
-        public static function broker($name = null)
-        {
-            return \Illuminate\Auth\Passwords\PasswordBrokerManager::broker($name);
-        }
-        
-        /**
-         * Get the default password broker name.
-         *
-         * @return string 
-         * @static 
-         */ 
-        public static function getDefaultDriver()
-        {
-            return \Illuminate\Auth\Passwords\PasswordBrokerManager::getDefaultDriver();
-        }
-        
-        /**
-         * Set the default password broker name.
-         *
-         * @param string $name
-         * @return void 
-         * @static 
-         */ 
-        public static function setDefaultDriver($name)
-        {
-            \Illuminate\Auth\Passwords\PasswordBrokerManager::setDefaultDriver($name);
-        }
-         
-    }
-
     class Queue {
         
         /**
@@ -12496,8 +11945,6 @@ class Auth extends \Illuminate\Support\Facades\Auth {}
 
     class Blade extends \Illuminate\Support\Facades\Blade {}
 
-    class Broadcast extends \Illuminate\Support\Facades\Broadcast {}
-
     class Bus extends \Illuminate\Support\Facades\Bus {}
 
     class Cache extends \Illuminate\Support\Facades\Cache {}
@@ -14570,12 +14017,6 @@ class Lang extends \Illuminate\Support\Facades\Lang {}
 
     class Log extends \Illuminate\Support\Facades\Log {}
 
-    class Mail extends \Illuminate\Support\Facades\Mail {}
-
-    class Notification extends \Illuminate\Support\Facades\Notification {}
-
-    class Password extends \Illuminate\Support\Facades\Password {}
-
     class Queue extends \Illuminate\Support\Facades\Queue {}
 
     class Redirect extends \Illuminate\Support\Facades\Redirect {}
diff --git a/composer.json b/composer.json
index 7622841..3598efe 100644
--- a/composer.json
+++ b/composer.json
@@ -6,6 +6,7 @@
     "type": "project",
     "require": {
         "php": ">=7.0",
+        "ext-json": "*",
         "barryvdh/laravel-cors": "^0.9.2",
         "barryvdh/laravel-ide-helper": "^2.4",
         "doctrine/dbal": "^2.6",
@@ -54,7 +55,7 @@
         "sort-packages": true,
         "optimize-autoloader": true,
         "platform": {
-            "php": "7.1.7"
+            "php": "7.1.7",
         }
     }
 }
diff --git a/database/migrations/2018_10_12_161641_add_index_for_log_table.php b/database/migrations/2018_10_12_161641_add_index_for_log_table.php
new file mode 100644
index 0000000..b9d7863
--- /dev/null
+++ b/database/migrations/2018_10_12_161641_add_index_for_log_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class AddIndexForLogTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('logs', function (Blueprint $table) {
+           $table->index('category_id');
+           $table->index('team_id');
+           $table->index('level_id');
+           $table->index('challenge_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}