diff --git a/composer.json b/composer.json
index 53a05bc..af5998d 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "php": ">=5.4.0",
+    "php": ">=7.0.0",
     "yiisoft/yii2": ">=2.0.5",
     "yiisoft/yii2-bootstrap": "*",
     "yiisoft/yii2-swiftmailer": "*",
diff --git a/migrations/m170727_174033_add_indexes.php b/migrations/m170727_174033_add_indexes.php
new file mode 100644
index 0000000..553026e
--- /dev/null
+++ b/migrations/m170727_174033_add_indexes.php
@@ -0,0 +1,71 @@
+<?php
+
+use yii\db\Migration;
+
+class m170727_174033_add_indexes extends Migration
+{
+    public function safeUp()
+    {
+        $this->createIndex('idx-board-type', 'board', 'type');
+        $this->createIndex('idx-board-secret', 'board', 'secret');
+        $this->createIndex('idx-event-active', 'event', 'active');
+        $this->createIndex('idx-history-type', 'history', 'type');
+        $this->createIndex('idx-history-event_id', 'history', 'event_id');
+        $this->createIndex('idx-history-board_id', 'history', 'board_id');
+        $this->createIndex('idx-history-user_id', 'history', 'user_id');
+        $this->createIndex('idx-history-item_id', 'history', 'item_id');
+        $this->createIndex('idx-history-commited_at', 'history', 'commited_at');
+        $this->createIndex('idx-item-board_id', 'item', 'board_id');
+        $this->createIndex('idx-item-pin', 'item', 'pin');
+        $this->createIndex('idx-item-type', 'item', 'type');
+        $this->createIndex('idx-item_widget-active', 'item_widget', 'active');
+        $this->createIndex('idx-item_widget-type', 'item_widget', 'type');
+        $this->createIndex('idx-item_widget-value_type', 'item_widget', 'value_type');
+        $this->createIndex('idx-item_widget-sort_order', 'item_widget', 'sort_order');
+        $this->createIndex('idx-room-sort_order', 'room', 'sort_order');
+        $this->createIndex('idx-setting-key', 'setting', 'key');
+        $this->createIndex('idx-task-active', 'task', 'active');
+        $this->createIndex('idx-task-type', 'task', 'type');
+        $this->createIndex('idx-task-item_id', 'task', 'item_id');
+        $this->createIndex('idx-trigger-active', 'trigger', 'active');
+        $this->createIndex('idx-trigger-type', 'trigger', 'type');
+        $this->createIndex('idx-user-auth_key', 'user', 'auth_key');
+        $this->createIndex('idx-user-auth_token', 'user', 'auth_token');
+        $this->createIndex('idx-user-status', 'user', 'status');
+        $this->createIndex('idx-user-group', 'user', 'group');
+        $this->createIndex('idx-user-api_key', 'user', 'api_key');
+    }
+
+    public function safeDown()
+    {
+        $this->dropIndex('idx-board-type', 'board');
+        $this->dropIndex('idx-board-secret', 'board');
+        $this->dropIndex('idx-event-active', 'event');
+        $this->dropIndex('idx-event-active', 'event');
+        $this->dropIndex('idx-history-type', 'history');
+        $this->dropIndex('idx-history-event_id', 'history');
+        $this->dropIndex('idx-history-board_id', 'history');
+        $this->dropIndex('idx-history-user_id', 'history');
+        $this->dropIndex('idx-history-item_id', 'history');
+        $this->dropIndex('idx-history-commited_at', 'history');
+        $this->dropIndex('idx-item-board_id', 'item');
+        $this->dropIndex('idx-item-pin', 'item');
+        $this->dropIndex('idx-item-type', 'item');
+        $this->dropIndex('idx-item_widget-active', 'item_widget');
+        $this->dropIndex('idx-item_widget-type', 'item_widget');
+        $this->dropIndex('idx-item_widget-value_type', 'item_widget');
+        $this->dropIndex('idx-item_widget-sort_order', 'item_widget');
+        $this->dropIndex('idx-room-sort_order', 'room');
+        $this->dropIndex('idx-setting-key', 'setting');
+        $this->dropIndex('idx-task-active', 'task');
+        $this->dropIndex('idx-task-type', 'task');
+        $this->dropIndex('idx-task-item_id', 'task');
+        $this->dropIndex('idx-trigger-active', 'trigger');
+        $this->dropIndex('idx-trigger-type', 'trigger');
+        $this->dropIndex('idx-user-auth_key', 'user');
+        $this->dropIndex('idx-user-auth_token', 'user');
+        $this->dropIndex('idx-user-status', 'user');
+        $this->dropIndex('idx-user-group', 'user');
+        $this->dropIndex('idx-user-api_key', 'user');
+    }
+}