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,
  },
  content: {
    type: Sequelize.DataTypes.TEXT,
    allowNull: false,
  },
});

const Tag = db.define("Tag", {
  id: {
    type: Sequelize.DataTypes.UUID,
    defaultValue: Sequelize.UUIDV4,
    allowNull: false,
    primaryKey: true,
    unique: true,
  },
  content: {
    type: Sequelize.DataTypes.STRING,
    allowNull: false,
  },
});

User.hasMany(Todo);
Todo.hasMany(Tag);

let options = {
  alter: false,
};
if (Config.config.alter_db) {
  options.alter = true;
}

UnverifiedUser.sync(options);
User.sync(options);
Todo.sync(options);
Tag.sync(options);
module.exports = {
  db: db,
  constructors: {
    user: () => {
      return User.build();
    },
  },
  schemas: {
    user: User,
  },
};