fix

src/connection_guard.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "connection_pool.h"
+#include <memory>
+
+class ConnectionGuard {
+public:
+    ConnectionGuard(ConnectionPool &pool)
+        : pool(pool), connection(pool.getConnection()) {}
+
+    ~ConnectionGuard() {
+        if (connection) {
+            pool.releaseConnection(connection);
+        }
+    }
+
+    Database &get() {
+        return *connection;
+    }
+
+private:
+    ConnectionPool &pool;
+    std::shared_ptr<Database> connection;
+};