CREATE TABLE IF NOT EXISTS slots (
  id INT AUTO_INCREMENT PRIMARY KEY,
  event_id INT NOT NULL,
  role_name VARCHAR(255) NOT NULL,
  start_at DATETIME NOT NULL,
  end_at DATETIME NOT NULL,
  capacity INT NOT NULL,
  bring_items_options VARCHAR(255) NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  CONSTRAINT fk_slots_event_id FOREIGN KEY (event_id) REFERENCES events(id) ON DELETE CASCADE,
  INDEX idx_slots_event_start (event_id, start_at)
);