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"content": " 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 ' . (int) $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 (?, ?, ?, ?)'",
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