Deleting DM's

So, I really would love to see this.
I have two requests
1) You can delete permanently a DM for both sides, this means u will no longer see the other user messages and yours, as if the DM always existed. (Tho, as u cant delete another person messages they will only see yours disappear.
2) Deleting only all of your messages or some messages from a DM i.e. "Delete messages from MM/DD/YY to MM/DD/YY"

Please, allow us to do this, I have tons of dm's I want gone. Deleting messages 1 by 1 is not an option.

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