taskManager & recurrent events generation

server/migrations/20200127101541-event_parent.js

@@ -0,0 +1,19 @@
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    // return Promise.resolve(1)
+    return queryInterface.addColumn('events', 'parentId', {
+      type: Sequelize.INTEGER,
+      references: {
+        model: 'events',
+        key: 'id'
+      },
+      onUpdate: 'CASCADE',
+      onDelete: 'SET NULL'
+    })
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.removeColumn('events', 'parentId')
+  }
+}