Ecto with the Postgrex adapter allow us to run a callback right after connect, with which we can call a function where the first argument will be:  %DBConnection{    conn_mod: Postgrex.Protocol,    conn_ref: #Reference<0.384196318.1471152129.192608>,    pool_mod: DBConnection.Task,    pool_ref: {#PID<0.734.0>, #Reference<0.384196318.1471152129.192606>} }  The PID in pool_ref refers to the checked out connection in the pool. This is only called after a successful connection whic...

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