Is your feature request related to a problem? Please describe.
Can we set savepoint (transaction) using SFDX?
What are you trying to do
eg, I wan to import data for 2 Objects with command sfdx force:data:bulk:upsert with 2 CSV files, and I want to rollback all data if the 2nd is failed.
Describe the solution you'd like
Auto-rollback all data by transaction.