diff --git a/Admin/Installer.php b/Admin/Installer.php
index e66f297..c34aa14 100644
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -47,13 +47,13 @@ class Installer extends InstallerAbstract
                 $dbPool->get('core')->con->prepare(
                     'CREATE TABLE if NOT EXISTS `' . $dbPool->get('core')->prefix . 'media` (
                             `media_id` int(11) NOT NULL AUTO_INCREMENT,
-                            `media_name`  varchar(100) NOT NULL,
+                            `media_name`  varchar(100) DEFAULT NULL,
                             `media_versioned`  tinyint(1) NOT NULL,
                             `media_file` varchar(255) NOT NULL,
-                            `media_extension` varchar(10) NULL,
-                            `media_collection` tinyint(1) NULL,
-                            `media_description` varchar(255) NULL,
-                            `media_size` int(11) NULL,
+                            `media_extension` varchar(10) DEFAULT NULL,
+                            `media_collection` tinyint(1) DEFAULT NULL,
+                            `media_description` varchar(255) DEFAULT NULL,
+                            `media_size` int(11) DEFAULT NULL,
                             `media_created_by` int(11) DEFAULT NULL,
                             `media_created_at` datetime DEFAULT NULL,
                             PRIMARY KEY (`media_id`),
diff --git a/Models/Collection.php b/Models/Collection.php
index 9bb375e..1f70ca0 100644
--- a/Models/Collection.php
+++ b/Models/Collection.php
@@ -39,6 +39,7 @@ class Collection extends Media
     private $sources = [];
 
     protected $extension = 'collection';
+
     protected $versioned = false;
 
     /**
@@ -49,6 +50,7 @@ class Collection extends Media
      */
     public function __construct()
     {
+        $this->createdAt = new \DateTime();
     }
 
     /**
diff --git a/Models/Media.php b/Models/Media.php
index 7fe39a2..f640531 100644
--- a/Models/Media.php
+++ b/Models/Media.php
@@ -127,6 +127,7 @@ class Media
      */
     public function __construct()
     {
+        $this->createdAt = new \DateTime();
     }
 
     /**
@@ -229,14 +230,14 @@ class Media
     }
 
     /**
-     * @param int $createdBy Creator
+     * @param mixed $createdBy Creator
      *
      * @return void
      *
      * @since  1.0.0
      * @author Dennis Eichhorn <d.eichhorn@oms.com>
      */
-    public function setCreatedBy(int $createdBy)
+    public function setCreatedBy($createdBy)
     {
         $this->createdBy = $createdBy;
     }