Move old backend code to old_src folder

Signed-off-by: David Mehren <git@herrmehren.de>

old_src/lib/migrations/20150515125813-create-temp.js

@@ -0,0 +1,18 @@
+'use strict'
+module.exports = {
+  up: async function (queryInterface, Sequelize) {
+    return queryInterface.createTable('Temp', {
+      id: {
+        type: Sequelize.STRING,
+        primaryKey: true
+      },
+      date: Sequelize.TEXT,
+      createdAt: Sequelize.DATE,
+      updatedAt: Sequelize.DATE
+    })
+  },
+
+  down: async function (queryInterface, Sequelize) {
+    return queryInterface.dropTable('Temp')
+  }
+}