А зачем это надо?

После рестарта все активные на момент падения сессии будут уничтожены и все транзакции в случае нештатного завершения будут откачены.

Если данные должны храниться постоянно - IMHO, это уже не сессия, а Persistent Storage.

WikiPedia.orgIn computer science, in particular networking, a session is a semi-permanent interactive information exchange, i.e. a dialogue, a conversation or a meeting, between two or more communicating devices, or between a computer and user (see Login session). A session is set up or established at a certain point in time, and torn down at a later point in time. An established communication session may involve more than one message in each direction. A session is typically, but not always, stateful, meaning that at least one of the communicating parts need to save information about the session history in order to be able to communicate, as opposed to stateless communication, where the communication consists of independent requests with responses.