Hello there,

  I need to design messages system for my users in site. Messages are
1:1 per pair of members (like sms in iOS), pair of members (2) can
have one conversation which holds all the messages between those
members.
What is the best possible design of such ( in speed 'n' cost ) ?

Current design looks like this: https://gist.github.com/bcfd2cb0537a432aaa18

Looking forward to hear comments, suggestions and possible
improvements.

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