code: func (d *Accessor) GetUnexpiredCertificates() (crs []certdb.CertificateRecord, err error) {
  	err = d.checkDB()
  	if err != nil {
  		return nil, err
  	}
  
  	err = d.db.Select(&crs, fmt.Sprintf(d.db.Rebind(selectAllUnexpiredSQL), sqlstruct.Columns(certdb.CertificateRecord{})))
  	if err != nil {
  		return nil, wrapSQLError(err)
  	}
  
  	return crs, nil
  }
docs: // GetUnexpiredCertificates gets all unexpired certificate from db.