public void ApplyDefaultsFromHost()
{
var firstKey = Db.Environment.FirstUserOid;
var lastKey = Db.Environment.LastUserOid;
if (firstKey > long.MaxValue || lastKey > long.MaxValue) {
throw new InvalidOperationException("Can not apply key range defaults: at least one value is out of range");
}
this.FirstUserOid = (long)firstKey;
this.LastUserOid = (long)lastKey;
}