Answers for "field modify in migration sequelize"

sequelize migration default value

queryInterface.addColumn('OrderBackups', 'my_column', {
  type: Sequelize.INTEGER,
  defaultValue: 0
})

sequelize migration limit

queryInterface.createTable(
    'Posts',
    {
        title: {
            type: Sequelize.DataTypes.STRING(100),
            allowNull: false
        }
    }
);