Is it advisable to deploy to /var?

[#1]

We are trying to deploy a workflow to the instance via code and the changes are withing "/conf/global/settings/workflow/models" and "/var/workflow/models". For the changes under /var and /conf, I have added filter to filter.xml. Is it advisable to deploy such changes through code? When I tried the changes seem to go in fine to the instance.

[#2]

yes it seems to work fine.  I added below to ui.content, filter.xml, matches to what berliant​ has mentioned. The "mode" is need basis.

<filter root="/var/workflow/models/customwf" mode="replace"/>

<filter root="/conf/global/settings/workflow/models/customwf" mode="replace"/>