-- Migration 003: Create categories table
-- Categories are scoped to a single store.

CREATE TABLE IF NOT EXISTS categories (
  id INT UNSIGNED NOT NULL AUTO_INCREMENT,
  store_id INT UNSIGNED NOT NULL,
  name VARCHAR(120) NOT NULL,
  slug VARCHAR(150) NOT NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (id),
  KEY idx_categories_store_id (store_id),
  UNIQUE KEY uq_categories_store_slug (store_id, slug),
  CONSTRAINT fk_categories_store FOREIGN KEY (store_id) REFERENCES stores (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;