I had a problem with the last update, I need to revert my data from the fep_* tables to the posts tables (the old style way). Can you help me to understand the exact database structure, please?
Having developed a lot of custom code, updating everything to the latest version would be too expensive. I have everything backed up and I have not deleted the previous posts, meta data etc. In fact (in the development site) replacing the plugin code with the old version everything works properly and I can see the messages before the change. So the easiest way for me is to “map” all the new messages (about 30) that use the tables fep_ * with the old system.
I imported a message (with manual operation in database), I see it in the wordpress backend, but it is not clear to me how to connect the metadata as the recipient etc.
see fep_participants table. mgs_participant column is user ids of that message participants. Add this value in post meta. key _participants. Add meta with this same key, for each value of that message from fep_participants table.