Are table names case sensitive in Heroku Postgres add-on?

Question

I migrate to Heroku Postgres with

module.exports = {
    async up(queryInterface, Sequelize) {
        await queryInterface.createTable('users', {
            id: {
                allowNull: false,
                autoIncrement: true,
                primaryKey: true,
                type: Sequelize.INTEGER,
                onDelete: 'CASCADE'
            },
            username: {
                allowNull: false,
                type: Sequelize.STRING
            },
            email: {
                allowNull: false,
                unique: true,
                type: Sequelize.STRING
            },
            password: {
                allowNull: false,
                type: Sequelize.STRING
            },
            created_at: {
                allowNull: false,
                type: Sequelize.DATE
            },
            updated_at: {
                allowNull: false,
                type: Sequelize.DATE
            }
        })
    },

    async down(queryInterface, Sequelize) {
        await queryInterface.dropTable('users')
    }
}

and Heroku logs an error saying that the table 'Users' does not exist.

So I changed 'users' for 'Users'...

In Heroku Postgress... appears the table in lowercase and finally, I receive the request