So, I need to bring back old workflow which is no longer visible in Temporal UI to complete one Activity with different result via CLI - this part I know how to do but did not find any info on how to bring back workflow. Is it even possible? Maybe just programmatically?
If the workflow history is not visible in the UI anymore, then the retention period for closed workflows has probably expired.
It depends now whether you have history archival enabled. If so, you can retrieve the history from the archival storage. If you know the workflow and run id for the workflow you should be able to retrieve the history using the temporal CLI. You can also browse the archival bucket and get the history directly from storage (provided you have workflow and run id).
–Hardy