Enforce unique constraint on relation activity storedobject

src/Bundle/ChillActivityBundle/migrations/Version20241202173942.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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.
+ */
+
+namespace Chill\Migrations\Activity;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20241202173942 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add a unique constraint on the storedobject linked to an activity';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql(
+            'WITH duplicate_activities AS (
+                SELECT storedobject_id, array_agg(activity_id ORDER BY activity_id DESC) AS activities
+                FROM activity_storedobject
+                GROUP BY storedobject_id
+                HAVING count(*) > 1
+            )
+            DELETE FROM activity_storedobject
+            WHERE activity_id IN (
+                SELECT unnest(activities[2:]) -- Keep the highest ID, delete the rest
+                FROM duplicate_activities
+            );'
+        );
+        $this->addSql('CREATE UNIQUE INDEX unique_storedobject_id ON activity_storedobject (storedobject_id)');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP INDEX IF EXISTS unique_storedobject_id');
+    }
+}