CREATE TABLE IF NOT EXISTS templates (
  id         INT AUTO_INCREMENT PRIMARY KEY,
  name       VARCHAR(150) NOT NULL,
  body       TEXT         NOT NULL,
  created_by INT          NULL,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE SET NULL
);