feat: add testing customer toggle

migrations/1641394367865-testing-customer-toggle.js

@@ -0,0 +1,13 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sql = [
+    `ALTER TABLE customers ADD COLUMN is_test_customer BOOLEAN DEFAULT false`,
+  ]
+
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}