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"content": "<?php\n\ndeclare(strict_types=1);\n\nnamespace UseCases\\Chat;\n\n\/\/ @responsibility: Lädt Chat-Session mit allen Nachrichten\n\nuse Domain\\Entity\\ChatSession;\nuse Domain\\Repository\\ChatMessageRepositoryInterface;\nuse Domain\\Repository\\ChatSessionRepositoryInterface;\n\nclass LoadChatSessionUseCase\n{\n public function __construct(\n private ChatSessionRepositoryInterface $sessionRepo,\n private ChatMessageRepositoryInterface $messageRepo\n ) {\n }\n\n \/**\n * Load session by UUID with all messages\n *\/\n public function execute(string $uuid): ?ChatSessionDTO\n {\n $session = $this->sessionRepo->findByUuid($uuid);\n\n if ($session === null) {\n return null;\n }\n\n $messages = $this->messageRepo->findBySessionId($session->getId() ?? 0);\n\n return new ChatSessionDTO($session, $messages);\n }\n\n \/**\n * Create a new session and return it\n *\n * @param array<string> $collections\n *\/\n public function createNew(\n string $model = 'claude-opus-4-5-20251101',\n array $collections = ['documents'],\n int $contextLimit = 5\n ): ChatSessionDTO {\n $uuid = $this->sessionRepo->generateUuid();\n\n $session = ChatSession::create($uuid, $model, $collections, $contextLimit);\n $sessionId = $this->sessionRepo->save($session);\n\n \/\/ Reload to get full data including timestamps\n $savedSession = $this->sessionRepo->findByUuid($uuid);\n\n return new ChatSessionDTO($savedSession ?? $session->withId($sessionId), []);\n }\n}\n",
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