running PV using uwsgi doesn't work properly

[equinox0815]

After switching to uwsgi to host the system, which greatly improves performance, there is a weird kind of caching. It seems as all the calls to today() are only evaluated when uwsgi is (re)started/reloaded and from that time one will be handled as a static values. This leads to increasingly outdated views.
Following this I already tried to fix this issue in 25b6bfb but this didn't solve the problem.

The workaround for now is to reload uwsgi every 10 minutes but this is far from being an acceptable solution.