CREATE TABLE IF NOT EXISTS presentation_overrides (
  id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  date_key VARCHAR(8) NOT NULL,
  slide_key VARCHAR(100) NOT NULL,
  content JSON DEFAULT NULL,
  hidden TINYINT(1) NOT NULL DEFAULT 0,
  sort_order INT NOT NULL DEFAULT 0,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY uq_date_slide (date_key, slide_key)
) ENGINE=InnoDB;