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"content": "<?php\n\nnamespace Infrastructure\\Persistence;\n\nuse Domain\\Repository\\ChatSessionRepositoryInterface;\nuse Infrastructure\\Config\\DatabaseFactory;\n\n\/**\n * Repository for Chat Session operations.\n *\/\nclass ChatSessionRepository implements ChatSessionRepositoryInterface\n{\n private \\PDO $pdo;\n\n public function __construct(?\\PDO $pdo = null)\n {\n $this->pdo = $pdo ?? DatabaseFactory::content();\n }\n\n public function findByUuid(string $uuid): ?array\n {\n $stmt = $this->pdo->prepare('SELECT * FROM chat_sessions WHERE uuid = ?');\n $stmt->execute([$uuid]);\n $result = $stmt->fetch(\\PDO::FETCH_ASSOC);\n\n return $result !== false ? $result : null;\n }\n\n public function findAll(int $limit = 50): array\n {\n $stmt = $this->pdo->query(\n 'SELECT s.*,\n (SELECT COUNT(*) FROM chat_messages WHERE session_id = s.id) as message_count,\n (SELECT COALESCE(SUM(tokens_input), 0) FROM chat_messages WHERE session_id = s.id) as total_input_tokens,\n (SELECT COALESCE(SUM(tokens_output), 0) FROM chat_messages WHERE session_id = s.id) as total_output_tokens,\n (SELECT COALESCE(SUM(end_microtime - start_microtime), 0) FROM chat_messages WHERE session_id = s.id AND start_microtime IS NOT NULL) as total_duration,\n (SELECT model FROM chat_messages WHERE session_id = s.id AND role = \"assistant\" ORDER BY id DESC LIMIT 1) as last_model\n FROM chat_sessions s\n ORDER BY s.last_activity DESC\n LIMIT ' . $limit\n );\n\n return $stmt->fetchAll(\\PDO::FETCH_ASSOC);\n }\n\n public function create(string $uuid, string $model, string $collections, int $contextLimit): int\n {\n $stmt = $this->pdo->prepare(\n 'INSERT INTO chat_sessions (uuid, model, collections, context_limit) VALUES (?, ?, ?, ?)'\n );\n $stmt->execute([$uuid, $model, $collections, $contextLimit]);\n\n return (int) $this->pdo->lastInsertId();\n }\n\n public function updateTitle(int $sessionId, string $title): void\n {\n $stmt = $this->pdo->prepare('UPDATE chat_sessions SET title = ? WHERE id = ?');\n $stmt->execute([$title, $sessionId]);\n }\n\n public function updateSettings(\n int $sessionId,\n string $model,\n array $collections,\n int $contextLimit,\n ?int $authorProfileId,\n float $temperature,\n int $maxTokens\n ): void {\n $collectionsJson = json_encode($collections);\n $stmt = $this->pdo->prepare(\n 'UPDATE chat_sessions SET model = ?, collections = ?, context_limit = ?, author_profile_id = ?, temperature = ?, max_tokens = ? WHERE id = ?'\n );\n $stmt->execute([\n $model,\n $collectionsJson,\n $contextLimit,\n $authorProfileId > 0 ? $authorProfileId : null,\n $temperature,\n $maxTokens,\n $sessionId,\n ]);\n }\n\n public function updateSystemPrompt(int $sessionId, ?string $systemPrompt): void\n {\n $stmt = $this->pdo->prepare('UPDATE chat_sessions SET system_prompt = ? WHERE id = ?');\n $stmt->execute([$systemPrompt !== '' ? $systemPrompt : null, $sessionId]);\n }\n\n public function delete(int $sessionId): void\n {\n $stmt = $this->pdo->prepare('DELETE FROM chat_sessions WHERE id = ?');\n $stmt->execute([$sessionId]);\n }\n\n public function touch(int $sessionId): void\n {\n $stmt = $this->pdo->prepare('UPDATE chat_sessions SET updated_at = NOW() WHERE id = ?');\n $stmt->execute([$sessionId]);\n }\n\n public function generateUuid(): string\n {\n $data = random_bytes(16);\n $data[6] = chr(ord($data[6]) & 0x0f | 0x40);\n $data[8] = chr(ord($data[8]) & 0x3f | 0x80);\n\n return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));\n }\n}\n",
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