<Kotlin - Exposed. How to run multiple tasks concu...

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Kotlin - Exposed. How to run multiple tasks concurrently on the same transaction with exposed?
I'm trying to make some work run concurrently to speed up the process.
Instead of running a batch job synchronously i want to run individual tasks with 10 threads/coroutines.
I want to process this all on a single transaction. If 1 job failed, the entire batch should be rollbacked.
Unfortunately, the code that i'm calling contains a lot of the following blocks. Also in code that i cannot change:
transaction {
}

These are several layers deep and i cannot change that.
Under the hood this seems...