add nice statistics

db/migrate/20200516063257_create_activity.rb

@@ -0,0 +1,14 @@
+class CreateActivity < ActiveRecord::Migration[8.0]
+  def change
+    create_table :activities do |t|
+      t.belongs_to :user, foreign_key: true
+      t.datetime :started_at, null: false
+      t.datetime :ended_at
+      t.string :platform
+      t.string :item_ref, null: false
+      t.string :item_title, null: false
+      t.string :item_length
+      t.timestamps
+    end
+  end
+end