Added valid_since and valid_until columns to shoirt_urls table

data/migrations/Version20171021093246.php

@@ -0,0 +1,41 @@
+<?php
+declare(strict_types=1);
+
+namespace ShlinkMigrations;
+
+use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\DBAL\Schema\SchemaException;
+use Doctrine\DBAL\Types\Type;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+class Version20171021093246 extends AbstractMigration
+{
+    /**
+     * @param Schema $schema
+     * @throws SchemaException
+     */
+    public function up(Schema $schema)
+    {
+        $shortUrls = $schema->getTable('short_urls');
+        $shortUrls->addColumn('valid_since', Type::DATETIME, [
+            'notnull' => false,
+        ]);
+        $shortUrls->addColumn('valid_until', Type::DATETIME, [
+            'notnull' => false,
+        ]);
+    }
+
+    /**
+     * @param Schema $schema
+     * @throws SchemaException
+     */
+    public function down(Schema $schema)
+    {
+        $shortUrls = $schema->getTable('short_urls');
+        $shortUrls->dropColumn('valid_since');
+        $shortUrls->dropColumn('valid_until');
+    }
+}