docs: add JSDoc headers to all externally exported store functions

src/store/brand/delete.js

@@ -1,6 +1,16 @@
 import { DELETE_BY_COMPANY_AND_ID } from '../../sql/brand.js';
 import resolveCompanyAccess from '../companyuser/resolveCompanyAccess.js';
 
+/**
+ * Deletes a brand for a company by its id.
+ *
+ * @param {object} pool - The mssql connection pool.
+ * @returns {Function} An async function that deletes a brand.
+ *
+ * @example
+ * const fn = del(pool);
+ * await fn(42, 1, 3);
+ */
 export default function del(pool) {
   const access = resolveCompanyAccess(pool);