add migration

migrations/m150305_173636_filesystem.php

@@ -0,0 +1,38 @@
+<?php
+
+use yii\db\Schema;
+use yii\db\Migration;
+
+class m150305_173636_filesystem extends Migration
+{
+    public function up()
+    {
+        $tableOptions = null;
+        if ($this->db->driverName === 'mysql') {
+            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB';
+        }
+
+        $this->createTable('{{%file}}', [
+            'id' => Schema::TYPE_PK,
+            'storage' => Schema::TYPE_STRING . '(10)',
+            'path' => Schema::TYPE_STRING . ' NOT NULL',
+            'extension' => Schema::TYPE_STRING . '(10) NOT NULL',
+            'format' => Schema::TYPE_STRING,
+            'type' => Schema::TYPE_STRING . ' NOT NULL',
+            'size' => Schema::TYPE_INTEGER . ' NOT NULL',
+            'hash' => Schema::TYPE_STRING . '(32) NOT NULL',
+            'owner_model' => Schema::TYPE_STRING,
+            'owner_id' => Schema::TYPE_INTEGER,
+            'expired' => Schema::TYPE_DATETIME,
+            'created' => Schema::TYPE_DATETIME,
+        ], $tableOptions);
+
+		$this->createIndex('file_hash', '{{%file}}', 'hash');
+		$this->createIndex('file_owner', '{{%file}}', ['owner_model', 'owner_id']);
+    }
+
+    public function down()
+    {
+		$this->dropTable('{{%file}}');
+    }
+}