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db558dc3fc
As per 92839dc722 lastMessage won't be null when a message is deleted. This would cause sorting issues when messages from a direct message channels are deleted as we would try to sort on last message and thought it would exist when actually it would be a null message.
I might rethink this design to not return any last_message in this case soon as checking on ID feels dirty and prone to error, so only fixing the issue for now.
This commit is also using `@cached` to avoid replaying the sort logic on each access.