-record(session, {
    clean_session :: boolean(),
    packet_id :: integer(),
    unacked_qos1 :: gleam@dict:dict(integer(), spoke@packet:message_data()),
    unreceived_qos2 :: gleam@dict:dict(integer(), spoke@packet:message_data()),
    unreleased_qos2 :: gleam@set:set(integer()),
    incomplete_qos2_in :: gleam@set:set(integer())
}).