diff --git a/src/Repository/CardDocumentRepository.php b/src/Repository/CardDocumentRepository.php
index f99ae7c..130da09 100644
--- a/src/Repository/CardDocumentRepository.php
+++ b/src/Repository/CardDocumentRepository.php
@@ -145,6 +145,34 @@ public function findDocument(int $cardId): ?array
         return $row !== false ? $this->hydrate($row) : null;
     }
 
+    /**
+     * Build documents for every card belonging to the given CardGroups, in one query.
+     * Used to bulk-reindex a small, targeted set of groups (e.g. after a gameplay-format
+     * import) without the N+1 HTTP-per-card cost of calling findDocument() in a loop.
+     *
+     * @param  int[] $cardGroupIds
+     * @return array<int, array<string, mixed>>
+     */
+    public function findDocumentsByCardGroupIds(array $cardGroupIds): array
+    {
+        if (empty($cardGroupIds)) {
+            return [];
+        }
+
+        $result = $this->connection->executeQuery(
+            $this->buildSql(whereCardGroupIds: true),
+            ['cardGroupIds' => $cardGroupIds],
+            ['cardGroupIds' => \Doctrine\DBAL\ArrayParameterType::INTEGER],
+        );
+
+        $docs = [];
+        while (($row = $result->fetchAssociative()) !== false) {
+            $docs[] = $this->hydrate($row);
+        }
+
+        return $docs;
+    }
+
     /**
      * Count total cards (for progress bars, etc.).
      */
@@ -171,9 +199,13 @@ private function sanitize(?string $text): ?string
         return preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]/', '', $clean);
     }
 
-    private function buildSql(bool $whereCardId = false): string
+    private function buildSql(bool $whereCardId = false, bool $whereCardGroupIds = false): string
     {
-        $where = $whereCardId ? 'WHERE c.id = :id' : '';
+        $where = match (true) {
+            $whereCardId       => 'WHERE c.id = :id',
+            $whereCardGroupIds => 'WHERE cg.id IN (:cardGroupIds)',
+            default            => '',
+        };
 
         return <<<SQL
             SELECT
diff --git a/src/Service/GameplayFormatImportService.php b/src/Service/GameplayFormatImportService.php
index d0e6eb3..9a27814 100644
--- a/src/Service/GameplayFormatImportService.php
+++ b/src/Service/GameplayFormatImportService.php
@@ -2,9 +2,13 @@
 
 namespace App\Service;
 
+use App\EventListener\CardSearchListener;
+use App\EventListener\MeilisearchSyncListener;
+use App\Repository\CardDocumentRepository;
 use App\Repository\CardGroupRepository;
 use App\Repository\CardRepository;
 use Doctrine\ORM\EntityManagerInterface;
+use Psr\Log\LoggerInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
@@ -19,7 +23,11 @@ public function __construct(
         private HttpClientInterface $httpClient,
         private CardRepository $cardRepository,
         private CardGroupRepository $cardGroupRepository,
+        private CardDocumentRepository $cardDocumentRepository,
+        private CardSearchUpdater $cardSearchUpdater,
+        private MeilisearchService $meilisearch,
         private EntityManagerInterface $em,
+        private LoggerInterface $logger,
     ) {}
 
     /**
@@ -58,6 +66,13 @@ public function fetchAndValidate(string $url): GameplayFormatImportResult
     /**
      * Adds $formatName to the gameplayFormat array of every given CardGroup (idempotent).
      *
+     * A CardGroup can have dozens of Card prints (reprints, serialized variants...).
+     * The default per-entity listeners (MeilisearchSyncListener, CardSearchListener)
+     * would fire once per Card on every touched CardGroup — for a few hundred groups
+     * that's thousands of synchronous Meilisearch HTTP calls in one request, which is
+     * what caused the 504 on import. Disable them for the bulk write and resync the
+     * affected groups in two batched calls instead.
+     *
      * @param int[] $cardGroupIds
      * @return int Number of CardGroups actually modified.
      */
@@ -68,17 +83,45 @@ public function apply(string $formatName, array $cardGroupIds): int
             return 0;
         }
 
-        $updated = 0;
-        foreach ($this->cardGroupRepository->findBy(['id' => $cardGroupIds]) as $cardGroup) {
-            $current = $cardGroup->getGameplayFormat();
-            if (!in_array($formatName, $current, true)) {
-                $cardGroup->setGameplayFormat([...$current, $formatName]);
-                $updated++;
+        $updatedGroupIds = [];
+
+        MeilisearchSyncListener::$disabled = true;
+        CardSearchListener::$disabled      = true;
+        try {
+            foreach ($this->cardGroupRepository->findBy(['id' => $cardGroupIds]) as $cardGroup) {
+                $current = $cardGroup->getGameplayFormat();
+                if (!in_array($formatName, $current, true)) {
+                    $cardGroup->setGameplayFormat([...$current, $formatName]);
+                    $updatedGroupIds[] = $cardGroup->getId();
+                }
             }
+            $this->em->flush();
+        } finally {
+            MeilisearchSyncListener::$disabled = false;
+            CardSearchListener::$disabled      = false;
+        }
+
+        if (empty($updatedGroupIds)) {
+            return 0;
+        }
+
+        foreach ($updatedGroupIds as $cardGroupId) {
+            $this->cardSearchUpdater->upsertByCardGroupId($cardGroupId);
+        }
+
+        try {
+            $this->meilisearch->indexDocuments(
+                $this->cardDocumentRepository->findDocumentsByCardGroupIds($updatedGroupIds)
+            );
+        } catch (\Throwable $e) {
+            // The gameplayFormat write already succeeded in Postgres — a Meilisearch
+            // hiccup here shouldn't fail the import, just leave the index briefly stale.
+            $this->logger->error('Gameplay-format import: bulk Meilisearch reindex failed', [
+                'error' => $e->getMessage(),
+            ]);
         }
-        $this->em->flush();
 
-        return $updated;
+        return count($updatedGroupIds);
     }
 
     /** @return string[] */
diff --git a/src/Service/MeilisearchService.php b/src/Service/MeilisearchService.php
index cdca10e..740e755 100644
--- a/src/Service/MeilisearchService.php
+++ b/src/Service/MeilisearchService.php
@@ -113,6 +113,20 @@ public function indexCard(Card $card): void
         }
     }
 
+    /**
+     * Push multiple prebuilt documents in a single request (bulk update, e.g. after
+     * a batch write that disabled the per-entity MeilisearchSyncListener).
+     *
+     * @param array<int, array<string, mixed>> $docs
+     */
+    public function indexDocuments(array $docs): void
+    {
+        if (empty($docs)) {
+            return;
+        }
+        $this->getIndex()->addDocuments($docs);
+    }
+
     /**
      * Delete a single card from the index.
      */