message: Fix Transaction open/close reversal
diff: @@ -51,11 +51,11 @@ export default class TransactionDb implements TxDb {
  }
  close (): void {
  - this.backing.open();
  + this.backing.close();
  }
  open (): void {
  - this.backing.close();
  + this.backing.open();
  }
  maintain (fn: ProgressCb): void {
  