RequestWorker: take unique ptr (fixes regression)

requestworker.h

@@ -17,17 +17,17 @@ class RequestWorker
 	UrlProvider *urlProvider;
 	ICache *cache;
 	HandlerFactory *handlerFactory;
-	SessionDao *sessionDao;
+	std::unique_ptr<SessionDao> sessionDao;
 
   private:
 	Session retrieveSession(std::string token) const;
 
   public:
-	RequestWorker(HandlerFactory &handlerFactory, SessionDao &sessionDao, Template &templ)
+	RequestWorker(HandlerFactory &handlerFactory, std::unique_ptr<SessionDao> sessionDao, Template &templ)
 	{
 		this->handlerFactory = &handlerFactory;
 		this->templ = &templ;
-		this->sessionDao = &sessionDao;
+		this->sessionDao = std::move(sessionDao);
 	}
 
 	Response processRequest(const Request &r);