.-----.                  .--------.
   |     |           W      |   DB   |
   | PGP |-----+----------->| MASTER |----.
   |     |     |            |        |    |
   `-----`     |            `--------`    | STREAMING REPLICATION
               |            .--------.    |
               |     R      |   DB   |    |
               +----------->| SLAVE1 |<---+
                            |        |
                            `--------`