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"content": "\n \/**\n * Initialize database connection\n *\/\n private function initializeDatabase(): \\PDO\n {\n $credentials = $this->loadCredentials();\n\n return new \\PDO(\n 'mysql:host=localhost;dbname=ki_protokoll;charset=utf8mb4',\n 'root',\n $credentials['db_password'],\n [\\PDO::ATTR_ERRMODE => \\PDO::ERRMODE_EXCEPTION]\n );\n }\n\n \/**\n * Load credentials from file\n *\/\n private function loadCredentials(): array\n {\n $file = '\/var\/www\/docs\/credentials\/credentials.md';\n $content = file_get_contents($file);\n\n $password = '';\n foreach (explode(\"\\n\", $content) as $line) {\n if (str_contains($line, 'MariaDB') && str_contains($line, 'root')) {\n $parts = explode('|', $line);\n if (count($parts) >= 4) {\n $password = trim($parts[3]);\n break;\n }\n }\n }\n\n return ['db_password' => $password];\n }\n\n \/**\n * Create a new chat session\n *\/\n private function createSession(): string\n {\n $uuid = $this->generateUuid();\n\n $stmt = $this->db->prepare(\n 'INSERT INTO chat_sessions (uuid, model, collection, context_limit) VALUES (?, ?, ?, ?)'\n );\n $stmt->execute([$uuid, 'claude-opus-4-5-20251101', 'documents', 5]);\n\n return $uuid;\n }\n\n \/**\n * Get session by UUID\n *\/\n private function getSession(string $uuid): ?array\n {\n $stmt = $this->db->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 \/**\n * Get all sessions ordered by most recent\n *\/\n private function getSessions(): array\n {\n $stmt = $this->db->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.updated_at DESC\n LIMIT 50'\n );\n\n return $stmt->fetchAll(\\PDO::FETCH_ASSOC);\n }\n\n \/**\n * Get author profiles from ki_system database\n *\/\n private function getAuthorProfiles(): array\n {\n $credentials = $this->loadCredentials();\n $dbSystem = new \\PDO(\n 'mysql:host=localhost;dbname=ki_system;charset=utf8mb4',\n 'root',\n $credentials['db_password'],\n [\\PDO::ATTR_ERRMODE => \\PDO::ERRMODE_EXCEPTION]\n );\n\n $stmt = $dbSystem->query('SELECT id, name, slug, config FROM author_profiles WHERE is_active = 1 ORDER BY id');\n",
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