For reasons I don't yet know, the last_activity function doesn't return anything in 1.2.3, regardless of the involvement of libDBI or not. Need to take a look at this for 1.2.4.
first problem was that a local sqlite database as helper is not created. Done. next is the behaviour of get_element...
Done, last_activity works with the exception of the timestamp, but I think I'll fix that tomorrow. We are good in time.
The timestamp can't be fixed due to a limitation of libDBI, which only returns a time_t for times that doesn't feature the resolution the millisecond. However, this functionality will be available with the next release of libDBI, and we will take that into account for a 1.2.4 release. So this can be closed.