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.
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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.
Let me know