Increased referer length to 1024 and ensured values are cropped before trying to insert in database

data/migrations/Version20190824075137.php

@@ -0,0 +1,36 @@
+<?php
+declare(strict_types=1);
+
+namespace ShlinkMigrations;
+
+use Doctrine\DBAL\Schema\Column;
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\DBAL\Schema\SchemaException;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20190824075137 extends AbstractMigration
+{
+    /**
+     * @throws SchemaException
+     */
+    public function up(Schema $schema): void
+    {
+        $this->getRefererColumn($schema)->setLength(1024);
+    }
+
+    /**
+     * @throws SchemaException
+     */
+    public function down(Schema $schema): void
+    {
+        $this->getRefererColumn($schema)->setLength(256);
+    }
+
+    /**
+     * @throws SchemaException
+     */
+    private function getRefererColumn(Schema $schema): Column
+    {
+        return $schema->getTable('visits')->getColumn('referer');
+    }
+}