migration.js

const GSession = require('./schema')

module.exports = {
    up(dbService) {
        return dbService.createTable(GSession.options.tableName, GSession.schema))
    },

    down(dbService) {
        return dbService.dropTable(Gsession.options.tableName)
    }
}

model.js

const GSession = require('./schema')

module.exports = sequelize => sequelize.define('GSession', GSession.schema, GSession.options)

Schema.js

const { DataTypes } = require('sequelize')

module.exports = {
    schema: {
        id: {
            type: DataTypes.INTEGER,
            primaryKey: true,
            allowNull: false,
            autoIncrement: true,
        },
        start_time: DataTypes.DATE,
        end_time: DataTypes.DATE,
        is_closed: {
            type: DataTypes.BOOLEAN,
            defaultValue: false,
        },
    },
    options: {
        tableName: 'gsessions',
        timestamps: false,
    },
}