     +------------------------------+
     |            users             |
     |                              |
     +------------------------------+
     |id                        int |
     |name             varchar(255) |
     |email            varchar(255) |
     |created_at          timestamp |
     |                              |
     +------------------------------+
       ^         ^                   
+----------------+                   
|      |                             
|      v                             
|    +------------------------------+
|    |            posts             |
|    |                              |
|    +------------------------------+
|    |id                        int |
|    |user_id                   int |
|    |title            varchar(255) |
|    |content                  text |
|    |published             boolean |
|    |                              |
|    +------------------------------+
|      ^                             
+----------------+                   
       v         v                   
     +------------------------------+
     |          comments            |
     |                              |
     +------------------------------+
     |id                        int |
     |post_id                   int |
     |user_id                   int |
     |body                     text |
     |                              |
     +------------------------------+
