Add sequelize storage

`id`, `createdAt`, and `updatedAt` are added by Sequelize by default when you create a new model.  IMO they're useful - `id` because it's a general practice and `createdAt` because it's useful to know when a migration was run.  `updatedAt` isn't useful by migrations but since Sequelize adds it by default IMO we shouldn't go out of our way to suppress it.