user-friendly job-database view

[HansVRP]

Problem
The job database now contains columns that are purely internal bookkeeping (running_start_time, cpu, memory, duration). Users who open their CSV or inspect job_db.df see these alongside their own data columns, which adds noise and can be confusing.

Could we expose a simplified "user view" of the database while keeping a full "developer view" internally?

[HansVRP]

@VictorVerhaert

might be better to separate off the discussion into a more topical issue