[galaxy-user] temporary files

Dear all, we extended the galaxy functionality with a couple of smaller custom scripts. Now we are in the need of some tmpFiles, since our data is getting bigger. As far as I understand galaxy by now there might be several options: - job_working_directory (all "normal" files generated by the job, deleted upon completion of job - safe?) - tmp-folder within the database folder (custom path in universe_wsgi.ini?) - system-tmp-folder (e.g. samtools-wraper -> only very limited space on this harddisk) What is the best way to store temporary data in Galaxy (that can be deleted after job completion)? Thank you in advance for your help! Chris