diff --git a/migrations/Version20260519175338.php b/migrations/Version20260519175338.php
new file mode 100644
index 0000000..6a43497
--- /dev/null
+++ b/migrations/Version20260519175338.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260519175338 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Align workflow schema with Doctrine naming (indexes, IDENTITY). Drops the partial unique index uniq_workflow_one_default (uniqueness is enforced by UniqueDefaultWorkflowListener at app level).';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER INDEX idx_project_workflow RENAME TO IDX_2FB3D0EE2C7C2CBA');
+        $this->addSql('ALTER INDEX idx_task_status_workflow RENAME TO IDX_40A9E1CF2C7C2CBA');
+        $this->addSql('DROP INDEX uniq_workflow_one_default');
+        $this->addSql('ALTER TABLE workflow ALTER id DROP DEFAULT');
+        $this->addSql('ALTER TABLE workflow ALTER id ADD GENERATED BY DEFAULT AS IDENTITY');
+        $this->addSql('ALTER INDEX uniq_workflow_name RENAME TO UNIQ_65C598165E237E06');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER INDEX idx_2fb3d0ee2c7c2cba RENAME TO idx_project_workflow');
+        $this->addSql('ALTER INDEX idx_40a9e1cf2c7c2cba RENAME TO idx_task_status_workflow');
+        $this->addSql('ALTER TABLE workflow ALTER id DROP IDENTITY');
+        $this->addSql("ALTER TABLE workflow ALTER id SET DEFAULT nextval('workflow_id_seq'::regclass)");
+        $this->addSql('CREATE UNIQUE INDEX uniq_workflow_one_default ON workflow (is_default) WHERE (is_default = true)');
+        $this->addSql('ALTER INDEX uniq_65c598165e237e06 RENAME TO uniq_workflow_name');
+    }
+}