permission of cache folder broken

[Stephan]

Ubuntu 18.04
Package: couriergrey
Architecture: amd64
Version: 0.3.2-5build2

Permission is not right:

/var/cache/couriergrey is owned by daemon:daemon. This leads to:

430 Greylisting DB could not be opened currently. Please try again later: Could not open database at /var/cache/couriergrey/deli...

Folder has to be writable by courier user:

fix:
chown courier:courier /var/cache/couriergrey

slightly unrelated:
Should filter be automatically enabled upon install of package? It did not, manual start was required:

filterctl start couriergrey

[Stephan (world-wide)]

cron /etc/cron.daily/couriergrey is also broken:

Could not open database at /var/cache/couriergrey/deliveryattempts.gdbm

it runs as user daemon, instead it should use user "courier"