code: func (cert *Certificate) Insert(tx *sql.Tx) error {
  	_, err := tx.Exec(`INSERT INTO certificates (ski, aki, serial, not_before, not_after, raw) values (?, ?, ?, ?, ?, ?)`, cert.SKI, cert.AKI, cert.Serial, cert.NotBefore, cert.NotAfter, cert.Raw)
  	return err
  }
docs: // Insert stores the Certificate in the database.