Thanks for your reply @Julian each message belongs to a single user only. Its not shared between users. So I am creating entity group for the list of messages per user. And other reason is if I am not using entity group for messages per user then I am getting problem in saving list of messages (say abt 200+, belongs to a single user) in a single transaction. I want to do add list of messages and update unread count in a single transaction to maintain consistency in read/unread count for messages per user.
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