diff --git a/migrations/Version20260620161500.php b/migrations/Version20260620161500.php
new file mode 100644
index 0000000..1e9b5a4
--- /dev/null
+++ b/migrations/Version20260620161500.php
@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * ProjectManagement module (LST-65 slice 3): add Timestampable/Blamable columns
+ * to task and project.
+ *
+ * Task and Project adopt TimestampableBlamableTrait (after TimeEntry). This
+ * migration is purely additive — nullable columns + nullable FK to "user" with
+ * ON DELETE SET NULL. No DROP/ALTER on existing data. Columns are lowercase
+ * snake_case. Hand-written to guarantee zero destructive instruction.
+ */
+final class Version20260620161500 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'ProjectManagement: add timestampable/blamable columns to task and project (additive)';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // task
+        $this->addSql('ALTER TABLE task ADD created_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL');
+        $this->addSql('ALTER TABLE task ADD updated_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL');
+        $this->addSql('ALTER TABLE task ADD created_by INT DEFAULT NULL');
+        $this->addSql('ALTER TABLE task ADD updated_by INT DEFAULT NULL');
+        $this->addSql('ALTER TABLE task ADD CONSTRAINT FK_527EDB25DE12AB56 FOREIGN KEY (created_by) REFERENCES "user" (id) ON DELETE SET NULL NOT DEFERRABLE');
+        $this->addSql('ALTER TABLE task ADD CONSTRAINT FK_527EDB2516FE72E1 FOREIGN KEY (updated_by) REFERENCES "user" (id) ON DELETE SET NULL NOT DEFERRABLE');
+        $this->addSql('CREATE INDEX IDX_527EDB25DE12AB56 ON task (created_by)');
+        $this->addSql('CREATE INDEX IDX_527EDB2516FE72E1 ON task (updated_by)');
+        $this->addSql("COMMENT ON COLUMN task.created_at IS 'Creation timestamp (Timestampable, set on prePersist)'");
+        $this->addSql("COMMENT ON COLUMN task.updated_at IS 'Last update timestamp (Timestampable, set on prePersist/preUpdate)'");
+        $this->addSql("COMMENT ON COLUMN task.created_by IS 'User who created the entry (Blamable, FK user.id, SET NULL on delete)'");
+        $this->addSql("COMMENT ON COLUMN task.updated_by IS 'User who last updated the entry (Blamable, FK user.id, SET NULL on delete)'");
+
+        // project
+        $this->addSql('ALTER TABLE project ADD created_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL');
+        $this->addSql('ALTER TABLE project ADD updated_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL');
+        $this->addSql('ALTER TABLE project ADD created_by INT DEFAULT NULL');
+        $this->addSql('ALTER TABLE project ADD updated_by INT DEFAULT NULL');
+        $this->addSql('ALTER TABLE project ADD CONSTRAINT FK_2FB3D0EEDE12AB56 FOREIGN KEY (created_by) REFERENCES "user" (id) ON DELETE SET NULL NOT DEFERRABLE');
+        $this->addSql('ALTER TABLE project ADD CONSTRAINT FK_2FB3D0EE16FE72E1 FOREIGN KEY (updated_by) REFERENCES "user" (id) ON DELETE SET NULL NOT DEFERRABLE');
+        $this->addSql('CREATE INDEX IDX_2FB3D0EEDE12AB56 ON project (created_by)');
+        $this->addSql('CREATE INDEX IDX_2FB3D0EE16FE72E1 ON project (updated_by)');
+        $this->addSql("COMMENT ON COLUMN project.created_at IS 'Creation timestamp (Timestampable, set on prePersist)'");
+        $this->addSql("COMMENT ON COLUMN project.updated_at IS 'Last update timestamp (Timestampable, set on prePersist/preUpdate)'");
+        $this->addSql("COMMENT ON COLUMN project.created_by IS 'User who created the entry (Blamable, FK user.id, SET NULL on delete)'");
+        $this->addSql("COMMENT ON COLUMN project.updated_by IS 'User who last updated the entry (Blamable, FK user.id, SET NULL on delete)'");
+    }
+
+    public function down(Schema $schema): void
+    {
+        // task
+        $this->addSql('ALTER TABLE task DROP CONSTRAINT FK_527EDB25DE12AB56');
+        $this->addSql('ALTER TABLE task DROP CONSTRAINT FK_527EDB2516FE72E1');
+        $this->addSql('DROP INDEX IDX_527EDB25DE12AB56');
+        $this->addSql('DROP INDEX IDX_527EDB2516FE72E1');
+        $this->addSql('ALTER TABLE task DROP created_at');
+        $this->addSql('ALTER TABLE task DROP updated_at');
+        $this->addSql('ALTER TABLE task DROP created_by');
+        $this->addSql('ALTER TABLE task DROP updated_by');
+
+        // project
+        $this->addSql('ALTER TABLE project DROP CONSTRAINT FK_2FB3D0EEDE12AB56');
+        $this->addSql('ALTER TABLE project DROP CONSTRAINT FK_2FB3D0EE16FE72E1');
+        $this->addSql('DROP INDEX IDX_2FB3D0EEDE12AB56');
+        $this->addSql('DROP INDEX IDX_2FB3D0EE16FE72E1');
+        $this->addSql('ALTER TABLE project DROP created_at');
+        $this->addSql('ALTER TABLE project DROP updated_at');
+        $this->addSql('ALTER TABLE project DROP created_by');
+        $this->addSql('ALTER TABLE project DROP updated_by');
+    }
+}
diff --git a/src/Module/ProjectManagement/Domain/Entity/Project.php b/src/Module/ProjectManagement/Domain/Entity/Project.php
index 1fe5cb1..793883e 100644
--- a/src/Module/ProjectManagement/Domain/Entity/Project.php
+++ b/src/Module/ProjectManagement/Domain/Entity/Project.php
@@ -16,8 +16,11 @@ use ApiPlatform\Metadata\Post;
 use App\Module\ProjectManagement\Infrastructure\ApiPlatform\Resource\SwitchWorkflowOutput;
 use App\Module\ProjectManagement\Infrastructure\ApiPlatform\State\SwitchProjectWorkflowProcessor;
 use App\Module\ProjectManagement\Infrastructure\Doctrine\DoctrineProjectRepository;
+use App\Shared\Domain\Contract\BlamableInterface;
 use App\Shared\Domain\Contract\ClientInterface;
 use App\Shared\Domain\Contract\ProjectInterface;
+use App\Shared\Domain\Contract\TimestampableInterface;
+use App\Shared\Domain\Trait\TimestampableBlamableTrait;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
@@ -56,8 +59,10 @@ use Symfony\Component\Validator\Constraints as Assert;
 #[ApiFilter(BooleanFilter::class, properties: ['archived'])]
 #[ORM\Entity(repositoryClass: DoctrineProjectRepository::class)]
 #[UniqueEntity(fields: ['code'], message: 'Ce code de projet est déjà utilisé.')]
-class Project implements ProjectInterface
+class Project implements ProjectInterface, TimestampableInterface, BlamableInterface
 {
+    use TimestampableBlamableTrait;
+
     #[ORM\Id]
     #[ORM\GeneratedValue]
     #[ORM\Column]
diff --git a/src/Module/ProjectManagement/Domain/Entity/Task.php b/src/Module/ProjectManagement/Domain/Entity/Task.php
index ecbabc3..2795a95 100644
--- a/src/Module/ProjectManagement/Domain/Entity/Task.php
+++ b/src/Module/ProjectManagement/Domain/Entity/Task.php
@@ -18,8 +18,11 @@ use ApiPlatform\Metadata\Post;
 use App\Module\ProjectManagement\Infrastructure\ApiPlatform\State\TaskCalendarProcessor;
 use App\Module\ProjectManagement\Infrastructure\ApiPlatform\State\TaskNumberProcessor;
 use App\Module\ProjectManagement\Infrastructure\Doctrine\DoctrineTaskRepository;
+use App\Shared\Domain\Contract\BlamableInterface;
 use App\Shared\Domain\Contract\TaskInterface;
+use App\Shared\Domain\Contract\TimestampableInterface;
 use App\Shared\Domain\Contract\UserInterface;
+use App\Shared\Domain\Trait\TimestampableBlamableTrait;
 use DateTimeImmutable;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
@@ -47,8 +50,10 @@ use Symfony\Component\Validator\Context\ExecutionContextInterface;
 #[ORM\Entity(repositoryClass: DoctrineTaskRepository::class)]
 #[ORM\Table(name: 'task')]
 #[ORM\UniqueConstraint(name: 'uniq_task_project_number', columns: ['project_id', 'number'])]
-class Task implements TaskInterface
+class Task implements TaskInterface, TimestampableInterface, BlamableInterface
 {
+    use TimestampableBlamableTrait;
+
     #[ORM\Id]
     #[ORM\GeneratedValue]
     #[ORM\Column]
diff --git a/tests/Functional/Module/ProjectManagement/TaskTimestampableTest.php b/tests/Functional/Module/ProjectManagement/TaskTimestampableTest.php
new file mode 100644
index 0000000..b457cec
--- /dev/null
+++ b/tests/Functional/Module/ProjectManagement/TaskTimestampableTest.php
@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Functional\Module\ProjectManagement;
+
+use App\Module\ProjectManagement\Domain\Entity\Project;
+use App\Module\ProjectManagement\Domain\Entity\Task;
+use DateTimeImmutable;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * Task adopts TimestampableBlamableTrait (LST-65 slice 3).
+ * Verifies the TimestampableBlamableSubscriber populates created_at on
+ * persist and refreshes updated_at on update.
+ *
+ * @internal
+ */
+final class TaskTimestampableTest extends KernelTestCase
+{
+    private EntityManagerInterface $em;
+
+    protected function setUp(): void
+    {
+        self::bootKernel();
+        $this->em = self::getContainer()->get(EntityManagerInterface::class);
+        $this->em->getConnection()->executeStatement("DELETE FROM task WHERE title = 'ts-test-task'");
+    }
+
+    protected function tearDown(): void
+    {
+        $this->em->getConnection()->executeStatement("DELETE FROM task WHERE title = 'ts-test-task'");
+        parent::tearDown();
+        unset($this->em);
+    }
+
+    public function testCreatedAtIsSetOnPersist(): void
+    {
+        $task = $this->makeTask();
+        $this->em->persist($task);
+        $this->em->flush();
+
+        self::assertInstanceOf(DateTimeImmutable::class, $task->getCreatedAt(), 'createdAt must be set after flush');
+        self::assertInstanceOf(DateTimeImmutable::class, $task->getUpdatedAt(), 'updatedAt must be set after flush');
+
+        $taskId = $task->getId();
+        $this->em->clear();
+        $reloaded = $this->em->getRepository(Task::class)->find($taskId);
+        self::assertNotNull($reloaded);
+        self::assertNotNull($reloaded->getCreatedAt(), 'created_at must be persisted in DB');
+    }
+
+    public function testUpdatedAtIsRefreshedOnUpdate(): void
+    {
+        $task = $this->makeTask();
+        $this->em->persist($task);
+        $this->em->flush();
+
+        $taskId           = $task->getId();
+        $initialUpdatedAt = $task->getUpdatedAt();
+        self::assertNotNull($initialUpdatedAt);
+
+        // Backdate the persisted value so the preUpdate refresh is observable
+        // even within the same second.
+        $this->em->getConnection()->executeStatement(
+            "UPDATE task SET updated_at = '2000-01-01 00:00:00' WHERE id = :id",
+            ['id' => $taskId],
+        );
+        $this->em->clear();
+
+        /** @var Task $managed */
+        $managed = $this->em->getRepository(Task::class)->find($taskId);
+        self::assertSame('2000-01-01 00:00:00', $managed->getUpdatedAt()?->format('Y-m-d H:i:s'));
+
+        $managed->setDescription('changed description');
+        $this->em->flush();
+        $this->em->clear();
+
+        /** @var Task $reloaded */
+        $reloaded = $this->em->getRepository(Task::class)->find($taskId);
+        self::assertNotNull($reloaded->getUpdatedAt());
+        self::assertNotSame(
+            '2000-01-01 00:00:00',
+            $reloaded->getUpdatedAt()->format('Y-m-d H:i:s'),
+            'updated_at must be refreshed and persisted on UPDATE',
+        );
+    }
+
+    private function makeTask(): Task
+    {
+        $project = $this->em->getRepository(Project::class)->findOneBy([]);
+        self::assertNotNull($project, 'Les fixtures doivent fournir au moins un projet.');
+
+        $task = new Task();
+        $task->setNumber(random_int(100000, 999999));
+        $task->setTitle('ts-test-task');
+        $task->setProject($project);
+
+        return $task;
+    }
+}