Sequelize: Changing model schema on production
You want to implement Sequelize migrations:
http://docs.sequelizejs.com/manual/tutorial/migrations.html
These will enable you to transition developer, staging, and production databases between known states.
A quicker way would be using {alter: true} option.
Ref: https://sequelize.org/master/class/lib/sequelize.js~Sequelize.html#instance-method-sync