Implement tax handling for branches by adding tax percent to regions, updating product sell costs, and enhancing UI for tax summaries in BranchView

backend/migrations/20260101000000-add-tax-percent-to-region.cjs

@@ -0,0 +1,17 @@
+"use strict";
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.sequelize.query(`
+      ALTER TABLE IF EXISTS falukant_data.region
+      ADD COLUMN IF NOT EXISTS tax_percent numeric NOT NULL DEFAULT 7;
+    `);
+  },
+
+  async down(queryInterface, Sequelize) {
+    await queryInterface.sequelize.query(`
+      ALTER TABLE IF EXISTS falukant_data.region
+      DROP COLUMN IF EXISTS tax_percent;
+    `);
+  }
+};