todo/backend/src/db_interface.js

const Sequelize = require('sequelize');
const Config = require('./config.js');

if (!Config.config.db_url) {
  console.error('No database url found. please set `db_url` in config.json');
  process.exit();
}

const db = new Sequelize(Config.config.db_url);

const UnverifiedUser = db.define('UnverifiedUser', {
  id: {
    type: Sequelize.DataTypes.UUID,
    defaultValue: Sequelize.UUIDV4,
    allowNull: false,
    primaryKey: true,
    unique: true
  },
  verificationToken: {
    type: Sequelize.DataTypes.STRING,
    allowNull: false
  },
  email: {
    type: Sequelize.DataTypes.STRING,
    allowNull: false,
    unique: true
  },
  password_hash: {
    type: Sequelize.DataTypes.STRING,
    allowNull: true
  }
});

const User = db.define('User', {
  id: {
    type: Sequelize.DataTypes.UUID,
    defaultValue: Sequelize.UUIDV4,
    allowNull: false,
    primaryKey: true,
    unique: true
  },
  email: {
    type: Sequelize.DataTypes.STRING,
    allowNull: false,
    unique: true
  },
  password_hash: {
    type: Sequelize.DataTypes.STRING,
    allowNull: true
  }
});

const Todo = db.define('Todo', {
  id: {
    type: Sequelize.DataTypes.UUID,
    defaultValue: Sequelize.UUIDV4,
    allowNull: false,
    primaryKey: true,
    unique: true
  },
  user: {
    type: Sequelize.DataTypes.UUID,
    allowNull: false
  },
  content: {
    type: Sequelize.DataTypes.TEXT,
    allowNull: false
  },
  tags: {
    type: Sequelize.DataTypes.ARRAY(Sequelize.DataTypes.STRING),
    allowNull: true
  },
  complete: {
    type: Sequelize.DataTypes.BOOLEAN,
    allowNull: false,
    defaultValue: false
  },
  deadline: {
    type: Sequelize.DataTypes.DATE,
    allowNull: true
  }
});

const Grouping = db.define('Grouping', {
  id: {
    type: Sequelize.DataTypes.UUID,
    defaultValue: Sequelize.UUIDV4,
    allowNull: false,
    primaryKey: true,
    unique: true
  },
  complete: {
    type: Sequelize.DataTypes.BOOLEAN,
    allowNull: true
  },
  manually_added: {
    type: Sequelize.DataTypes.ARRAY(Sequelize.DataTypes.UUID),
    allowNull: true
  },
  required: {
    type: Sequelize.DataTypes.ARRAY(Sequelize.DataTypes.STRING),
    allowNull: true
  },
  exclusions: {
    type: Sequelize.DataTypes.ARRAY(Sequelize.DataTypes.STRING),
    allowNull: true
  }
});

let options = {
  alter: false
};
if (Config.config.alter_db) {
  options.alter = true;
}
let start = async () => {
  await UnverifiedUser.sync(options);
  await User.sync(options);
  await Todo.sync(options);
  await Grouping.sync(options);
};
start();
module.exports = {
  db: db,
  constructors: {
    user: () => {
      return User.build();
    }
  },
  schemas: {
    user: User,
    unverifiedUser: UnverifiedUser,
    todo: Todo,
    grouping: Grouping
  }
};