acknowledgements does not survive xymon restart

Experts:

I have a new fairly large xymon environment (4.3.28 with >10k servers), and
of course there are always a lot of alerts acknowledged.

Unfortunately all these acks are resetted if i restart the xymon daemon
(xymon.sh restart) to activate config changes f.e.
This is the same if i use the "Acknowledge alert" from the menu or the
(undocumented) "xymondack" feature of xymon.
This leads to a lot of extra effort and confusion...
Any ideas how i can save the ack situation and restore it after a restart?

Norbert