handle double dispense WIP

migrations/010-cached-requests.js

@@ -0,0 +1,19 @@
+'use strict'
+
+var db = require('./db')
+
+exports.up = function (next) {
+  db.query('CREATE TABLE IF NOT EXISTS cached_requests ( ' +
+    'id serial PRIMARY KEY, ' +
+    'device_fingerprint text NOT NULL, ' +
+    'session_id uuid NOT NULL, ' +
+    'path text NOT NULL, ' +
+    'method text NOT NULL, ' +
+    'body json NOT NULL, ' +
+    'UNIQUE (device_fingerprint, session_id, path, method) ' +
+    ')', next)
+}
+
+exports.down = function (next) {
+  next()
+}