code: def create_run(cmd, project, exp, grp):
      
      from benchbuild.utils import schema as s
  
      session = s.Session()
      run = s.Run(
          command=str(cmd),
          project_name=project.name,
          project_group=project.group,
          experiment_name=exp,
          run_group=str(grp),
          experiment_group=project.experiment.id)
      session.add(run)
      session.commit()
  
      return (run, session)
docs: Create a new 'run' in the database.
  
      This creates a new transaction in the database and creates a new
      run in this transaction. Afterwards we return both the transaction as
      well as the run itself. The user is responsible for committing it when
      the time comes.
  
      Args:
          cmd: The command that has been executed.
          prj: The project this run belongs to.
          exp: The experiment this run belongs to.
          grp: The run_group (uuid) we blong to.
  
      Returns:
          The inserted tuple representing the run and the session opened with
          the new run. Don't forget to commit it at some point.