feat: save last auth attempt per customer

migrations/1716969535424-customer-last-auth-attempt.js

@@ -0,0 +1,13 @@
+const db = require('./db')
+
+exports.up = function (next) {
+  let sql = [
+    'ALTER TABLE customers ADD COLUMN last_auth_attempt timestamptz'
+  ]
+
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}