public void SaveObjects(IEntitySession session, IList <object> items)
{
//Schedule update query that will update all LastActiveOn columns for all sessions with ID in the hashset
//We could use DateTime.Now as value for LastUsedOn for all sessions, it is within few seconds, but...
// this causes problems for unit tests for session expiration, when we try to shift current time and see if session is expired;
// (with current sessions would be updated to shifted time). So we keep actual time (latest) while we accumulate sessions for update
var query = session.EntitySet <TUserSession>().Where(s => _sessionIds.Contains(s.Id))
.Select(s => new { Id = s.Id, LastUsedOn = _lastUsed });
session.ScheduleNonQuery <TUserSession>(query, Vita.Entities.Linq.LinqCommandType.Update);
}