diff --git a/src/Bundle/ChillMainBundle/migrations/Version20150821105642.php b/src/Bundle/ChillMainBundle/migrations/Version20150821105642.php
index 06b2fa638..a94f8bc6f 100644
--- a/src/Bundle/ChillMainBundle/migrations/Version20150821105642.php
+++ b/src/Bundle/ChillMainBundle/migrations/Version20150821105642.php
@@ -24,17 +24,9 @@ use function count;
  *     ManyToMany between PermissionGroup <-> GroupCenter
  * to
  *     ManyToOne : a GroupCenter can have only one PermissionGroup.
- *
- * @see https://redmine.champs-libres.coop/issues/578 The issue describing the move
  */
-class Version20150821105642 extends AbstractMigration implements \Symfony\Component\DependencyInjection\ContainerAwareInterface
+class Version20150821105642 extends AbstractMigration
 {
-    private ?\Symfony\Component\DependencyInjection\ContainerInterface $container = null;
-    public function __construct(\Doctrine\DBAL\Connection $connection, \Psr\Log\LoggerInterface $logger, private readonly \Doctrine\ORM\EntityManager $entityManager)
-    {
-        parent::__construct($connection, $logger);
-    }
-
     public function down(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
@@ -44,101 +36,8 @@ class Version20150821105642 extends AbstractMigration implements \Symfony\Compon
         $this->addSql('ALTER TABLE group_centers DROP permissionGroup_id');
     }
 
-    public function postUp(Schema $schema): void
-    {
-        /*
-         * Before the upgrade to symfony version 4, this code worked.
-         *
-         * But it doesn't work any more after the migration and currently this
-         * code should note be necessary.
-         *
-         * This code is kept for reference, and may be re-activated if needed, but
-         * the probability that this will happens is near 0
-         */
-        return;
-        //transform data from groupcenter_permissionsgroup table
-        $em = $this->entityManager;
-
-        //get all existing associations
-        $rsm = new ResultSetMapping();
-        $rsm->addScalarResult('groupcenter_id', 'groupcenter_id');
-        $rsm->addScalarResult('permissionsgroup_id', 'permissionsgroup_id');
-
-        $groupPermissionsAssociations = $em->createNativeQuery(
-            'SELECT groupcenter_id, permissionsgroup_id '
-                . 'FROM groupcenter_permissionsgroup',
-            $rsm
-        )
-            ->getScalarResult();
-
-        //update
-        foreach ($groupPermissionsAssociations as $groupPermissionAssociation) {
-            //get the corresponding groupCenter
-            $rsmGroupCenter = new ResultSetMapping();
-            $rsmGroupCenter->addScalarResult('id', 'id');
-            $rsmGroupCenter->addScalarResult('permissionsGroup_id', 'permissionsGroup_id');
-            $rsmGroupCenter->addScalarResult('center_id', 'center_id');
-
-            $groupCenters = $em->createNativeQuery(
-                'SELECT id, permissionsGroup_id, center_id '
-                    . 'FROM group_centers '
-                    . 'WHERE id = :groupcenter_id AND permissionsGroup_id IS NULL',
-                $rsmGroupCenter
-            )
-                ->setParameter('groupcenter_id', $groupPermissionAssociation['groupcenter_id'])
-                ->getResult();
-
-            if (count($groupCenters) === 1) {
-                // we have to update this group with the current association
-                $em->getConnection()->executeUpdate(
-                    'UPDATE group_centers '
-                        . 'SET permissionsGroup_id = ? '
-                        . 'WHERE id = ?',
-                    [
-                        $groupPermissionAssociation['permissionsgroup_id'],
-                        $groupPermissionAssociation['groupcenter_id'], ]
-                );
-            } elseif (count($groupCenters) === 0) {
-                // the association was multiple. We have to create a new group_center
-                $rsmNewId = new ResultSetMapping();
-                $rsmNewId->addScalarResult('new_id', 'new_id');
-                $newId = $em->createNativeQuery(
-                    "select nextval('group_centers_id_seq') as new_id",
-                    $rsmNewId
-                )
-                    ->getSingleScalarResult();
-
-                $em->getConnection()->insert('group_centers', [
-                    'id' => $newId,
-                    'center_id' => $group_center['center_id'],
-                    'permissionsGroup_id' => $groupPermissionAssociation['permissionsgroup_id'],
-                ]);
-
-                // we have to link existing users to new created groupcenter
-                $em->getConnection()->executeQuery('INSERT INTO user_groupcenter '
-                        . '(user_id, groupcenter_id) SELECT user_id, ' . $newId . ' '
-                        . 'FROM user_groupcenter WHERE groupcenter_id = '
-                        . $groupPermissionAssociation['groupcenter_id']);
-            } else {
-                throw new RuntimeException('Error in the data : we should not have two groupCenter '
-                        . 'with the same id !');
-            }
-        }
-    }
-
-    public function setContainer(?ContainerInterface $container = null)
-    {
-        if (null === $container) {
-            throw new RuntimeException('Container is not provided. This migration '
-                    . 'need container to set a default center');
-        }
-
-        $this->container = $container;
-    }
-
     public function up(Schema $schema): void
     {
-        // this up() migration is auto-generated, please modify it to your needs
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 
         $this->addSql('ALTER TABLE group_centers ADD permissionsGroup_id INT DEFAULT NULL');