code: func (cr *CertificateRelease) Insert(tx *sql.Tx) error {
  	query := fmt.Sprintf("INSERT INTO %ss (ski, serial, release) VALUES (?, ?, ?)", cr.Release.table())
  	_, err := tx.Exec(query, cr.Certificate.SKI, cr.Certificate.Serial, cr.Release.Version)
  	return err
  }
docs: // Insert stores the CertificateRelease in the database. It does no
  // checking to determine if the CertificateRelease is already in the
  // database, and will fail if it's already present in the database
  // (due to UNIQUE constraints).