code: func NewMetaData() *MetaData {
  	now := w.Now()
  
  	return &MetaData{
  		MasterKeyChanged:       &now,
  		MasterKeyChangeRec:     -1,
  		MasterKeyChangeForce:   -1,
  		HistoryMaxItems:        10,
  		HistoryMaxSize:         6291456, // 6 MB
  		MaintenanceHistoryDays: 365,
  	}
  }
docs: // NewMetaData creates a MetaData struct with some defaults set