Conversation.onReadMessage - queue job, don't send read receipts
Conversation.onReadMessage - queue job, don't send read receipts

We queue the job because we often get a whole lot of read receipts at
once, and their markRead calls could very easily overlap given the async
pull from DB.

We also disable read receipts for any message marked read due to a read
receipt. That's a notification explosion we don't need.

FREEBIE

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