No graphs after upgrade from CRE to CEE

Troubleshooting
3

I’ve copied the old graphs from nagios:
cp var/nagios/nagios.log var/check_mk/core/archive/
cp var/nagios/archive/* var/check_mk/core/archive/

I did check the RRD data convert (but data was “uptodate”:
cmk -v --convert-rrds
cmk -v --convert-rrds --delete-rrds

I’ve renamed the host check RRD data for Smart Ping:
/var/pnp4nagios/perfdata/ HOST* → PING*

Did I miss something else?