Keep pregame lobby chat open for an hour after the game ends

The chat used to disappear the moment a session left CREATED status.
Sessions now record a finishedAt timestamp when they're won or lost,
and the lobby (with chat) stays reachable via /game/{session} for an
hour afterward instead of immediately redirecting to the win/lose
feedback page. The lobby template shows a distinct "game finished"
header with a link to that feedback page during this window.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/Game/Controller/GameAdminSessionController.php

@@ -35,6 +35,7 @@ final class GameAdminSessionController extends AbstractController
         }
 
         $session->setStatus(SessionStatus::LOST);
+        $session->setFinishedAt(new \DateTime());
         $em->flush();
 
         $this->addFlash('success', sprintf('Session #%d closed.', $session->getId()));

src/Game/Controller/GameApiController.php

@@ -43,6 +43,7 @@ final class GameApiController extends AbstractController
         if ($session->getStatus() === SessionStatus::PLAYING) {
             if ($session->getTimer() !== null && $now >= $session->getTimer()) {
                 $session->setStatus(SessionStatus::LOST);
+                $session->setFinishedAt(new \DateTime());
                 $this->entityManager->persist($session);
                 $this->entityManager->flush();
                 $isFinished = true;

src/Game/Controller/GameController.php

@@ -149,7 +149,7 @@ final class GameController extends AbstractController
         // Lazily pick up readiness changes from other players since our last request
         $dashboardService->checkAllPlayersReady($session);
 
-        if ($session->getStatus() === SessionStatus::CREATED) {
+        if ($dashboardService->isLobbyChatOpen($session)) {
             return $this->render('game/lobby.html.twig', [
                 'session' => $session,
                 'messages' => $dashboardService->getLobbyMessages($session),

src/Game/Entity/Session.php

@@ -31,6 +31,9 @@ class Session
     #[ORM\Column(type: Types::DATETIME_MUTABLE)]
     private ?\DateTimeInterface $created = null;
 
+    #[ORM\Column(type: Types::DATETIME_MUTABLE, nullable: true)]
+    private ?\DateTimeInterface $finishedAt = null;
+
     #[ORM\OneToMany(mappedBy: 'session', targetEntity: Player::class)]
     private Collection $players;
 
@@ -97,6 +100,18 @@ class Session
         return $this;
     }
 
+    public function getFinishedAt(): ?\DateTimeInterface
+    {
+        return $this->finishedAt;
+    }
+
+    public function setFinishedAt(?\DateTimeInterface $finishedAt): static
+    {
+        $this->finishedAt = $finishedAt;
+
+        return $this;
+    }
+
     /**
      * @return Collection<int, Player>
      */

src/Game/Service/GameDashboardService.php

@@ -24,6 +24,7 @@ final class GameDashboardService
 {
     private const READY_TIMEOUT_SECONDS = 60;
     private const LOBBY_MESSAGE_MAX_LENGTH = 500;
+    private const LOBBY_CHAT_GRACE_PERIOD_SECONDS = 3600;
 
     public function __construct(
         private readonly GameRepository $gameRepository,
@@ -302,9 +303,32 @@ final class GameDashboardService
         return $this->lobbyMessageRepository->findForSession($session);
     }
 
+    /**
+     * The lobby chat is open while a session is still gathering players, and stays
+     * open for a grace period after the game ends so players can wrap up the
+     * conversation before it disappears.
+     */
+    public function isLobbyChatOpen(Session $session): bool
+    {
+        if ($session->getStatus() === SessionStatus::CREATED) {
+            return true;
+        }
+
+        if (!in_array($session->getStatus(), [SessionStatus::WON, SessionStatus::LOST], true)) {
+            return false;
+        }
+
+        $finishedAt = $session->getFinishedAt();
+        if ($finishedAt === null) {
+            return false;
+        }
+
+        return (new \DateTime())->getTimestamp() - $finishedAt->getTimestamp() < self::LOBBY_CHAT_GRACE_PERIOD_SECONDS;
+    }
+
     public function postLobbyMessage(Session $session, User $user, string $content): ?LobbyMessage
     {
-        if ($session->getStatus() !== SessionStatus::CREATED) {
+        if (!$this->isLobbyChatOpen($session)) {
             return null;
         }
 

src/Game/Service/GameResponseService.php

@@ -1118,6 +1118,7 @@ class GameResponseService
         }
 
         $session->setStatus(SessionStatus::WON);
+        $session->setFinishedAt(new \DateTime());
         $this->entityManager->persist($session);
         $this->entityManager->flush();