On ejabberd 16.01, is it possible to store entire group messages history (muc mode) in odbc using mam mode?
I can see that created room are stored in persistent database but I am wondering can message history be stored as well...
Yes it is possible to archive group messages using mod_mam
you can simple install mod_mam and configure ejabberd like this:
with setting default to always it will archive all messages including MUC messages.