This is a hosted domain, so all files have the same owner, and I cannot change any file ownership.
cron.php has permission level 604, so user +read +write, group nothing, public +read.
Also: cron.php is running, as I can see in the log output I added.
What log level is needed for cron output?
Edit: I just set the log level to the highest level, using the admin interface, but now the log file is drowned in entries related to “validateToken” – that is not terribly useful.
Why would that make any difference to the overall cron behavior, if it is run every 15 min instead of once in 24h? If webcron is run, I would expect it to do a “full” run, i.e. clean up everything that needs cleaning up. I don’t need this to be done every 15 min, this server is not used that intensely.
I must say this whole cron cleanup business is pretty opaque…