feat: assign default sell/purchase tax rates to items (#261)

packages/server/src/database/migrations/20231004020636_add_sell_purchase_tax_to_items_table.js

@@ -0,0 +1,18 @@
+exports.up = (knex) => {
+  return knex.schema.table('items', (table) => {
+    table
+      .integer('sell_tax_rate_id')
+      .unsigned()
+      .references('id')
+      .inTable('tax_rates');
+    table
+      .integer('purchase_tax_rate_id')
+      .unsigned()
+      .references('id')
+      .inTable('tax_rates');
+  });
+};
+
+exports.down = (knex) => {
+  return knex.schema.dropTableIfExists('tax_rates');
+};