working

backend/models/Contact.js

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+const Sequelize = require("sequelize");
+
+const sequelize = require("../util/database");
+
+const Message = require("./Message");
+
+const Contact = sequelize.define("contact", {
+	id: {
+		type: Sequelize.INTEGER,
+		allowNull: false,
+		primaryKey: true,
+		autoIncrement: true,
+	},
+	name: { type: Sequelize.STRING(100), allowNull: false },
+	number: { type: Sequelize.STRING(15), allowNull: false },
+	imageURL: { type: Sequelize.STRING(200) },
+});
+
+Contact.hasMany(Message);
+
+module.exports = Contact;

backend/models/Message.js

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+const Sequelize = require("sequelize");
+const sequelize = require("../util/database");
+
+const Message = sequelize.define("message", {
+	userId: { type: Sequelize.INTEGER, defaultValue: 0 },
+	messageBody: { type: Sequelize.STRING(250), allowNull: false },
+	read: { type: Sequelize.BOOLEAN, defaultValue: false },
+});
+
+module.exports = Message;

backend/models/User.js

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+const Sequelize = require("sequelize");
+
+const sequelize = require("../util/database");
+
+const User = sequelize.define("user", {
+	id: {
+		type: Sequelize.INTEGER,
+		allowNull: false,
+		primaryKey: true,
+		autoIncrement: true,
+	},
+	name: { type: Sequelize.STRING(100), allowNull: false },
+	password: { type: Sequelize.STRING(100), allowNull: false },
+	email: { type: Sequelize.STRING(100), allowNull: false },
+});
+
+module.exports = User;