address reference: add index for refid

src/Bundle/ChillMainBundle/migrations/Version20211216213649.php

@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Chill\Migrations\Main;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20211216213649 extends AbstractMigration
+{
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP INDEX address_refid');
+    }
+
+    public function getDescription(): string
+    {
+        return 'add an index on address reference refid';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE INDEX address_refid ON chill_main_address_reference (refId) WHERE refid != \'\'');
+    }
+}