text: DROP TABLE IF EXISTS user;
  DROP TABLE IF EXISTS post;
  
  CREATE TABLE user (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    username TEXT UNIQUE NOT NULL,
    password TEXT NOT NULL
  );
  
  CREATE TABLE post (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    author_id INTEGER NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    title TEXT NOT NULL,
    body TEXT NOT NULL,
    FOREIGN KEY (author_id) REFERENCES user (id)
  );
  