Created index on visits.date column

data/migrations/Version20200503170404.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20200503170404 extends AbstractMigration
+{
+    private const INDEX_NAME = 'IDX_visits_date';
+
+    public function up(Schema $schema): void
+    {
+        $visits = $schema->getTable('visits');
+        $this->skipIf($visits->hasIndex(self::INDEX_NAME));
+        $visits->addIndex(['date'], self::INDEX_NAME);
+    }
+
+    public function down(Schema $schema): void
+    {
+        $visits = $schema->getTable('visits');
+        $this->skipIf(! $visits->hasIndex(self::INDEX_NAME));
+        $visits->dropIndex(self::INDEX_NAME);
+    }
+}

module/Core/config/entities-mappings/Shlinkio.Shlink.Core.Entity.Visit.php

@@ -32,6 +32,8 @@ return static function (ClassMetadata $metadata, array $emConfig): void {
             ->columnName('`date`')
             ->build();
 
+    $builder->addIndex(['date'], 'IDX_visits_date');
+
     $builder->createField('remoteAddr', Types::STRING)
             ->columnName('remote_addr')
             ->length(Visitor::REMOTE_ADDRESS_MAX_LENGTH)