Persist live SQL telemetry data after job ends for post-mortem debugging #2977
Description
When doing debugging and investigations of jobs, the job might terminate either successfully or with a failure. The job might also fail because the client disconnects or kills the job.
In these cases, we don't want to lose the live telemetry data stored in data fusion, as this can be very valuable for post-mortem debugging.
Right now the data is stored purely in memory and is owned (eventually) by the client. If the client disconnects or sends "stop" commands, right now the actor will just stop and drop the data it holds.
Extend the system to persist the data somehow such that it could be retrieved after the job completes