Voytek wrote:

is there any process that clears /tmp ?

init, and others.

is it ok to make subdirs below /tmp ?

yes. but get the ownership+permissions correct
and anticipate multiple instances of your program
running.

should I've made a /tmp/.domain.tld ?

makes no difference, as the tmp-scubbers know about
dot-files.

If you use /tmp you should be prepared for it to be
cleared in-between invocations of your program (including
but not limited to reboots).  That's easy to do, it's
just a matter of checking if /tmp/whatever/ exists and
has the ownership/permissions you expect and creating it
otherwise.

If you need to retain data between boots then create
a subdirectory under /var/.  If you uninstall the
program then that data may be removed.  If that's an
issue then use /srv/.

Cheers,
Glen
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