use CGI::Armature::Storage;
use CGI::Armature::Database;

my $storage_map = {
    fetch=>'get_value',
    store=>'set_value',
    fetch_ids=>'get_keys',
    delete=>'delete',
};

my $storage = CGI::Armature::Storage->new(
    CGI::Armature::Database->new('session_id.db'),
    $storage_map,
);

my $data = $storage->fetch($session_id);