simple blog, users can sign in/up/out and create new posts. other users can like them or give them a comment.
| Tables | Columns |
|---|---|
| users | id(u-id), name(first name, last name) |
| blogs | id(b-id), text, user_id->(u-id), created_at |
| likes | id, blog_id->(b-id), user_id->(u-id) |
| comments | id, text, blog_id->(b-id), user_id->(u-id), created_at |