feat: customer auth via email

migrations/1700123461281-customer-email.js

@@ -0,0 +1,14 @@
+const db = require('./db')
+
+exports.up = function (next) {
+  let sql = [
+    'ALTER TABLE customers ADD COLUMN email text unique',
+    'ALTER TABLE customers ADD COLUMN email_at timestamptz',
+  ]
+
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}