Add authentication endpoints with logic

services/users/usersModel.js

@@ -0,0 +1,25 @@
+const db = require('../../data/dbConfig');
+
+module.exports = {
+	add,
+	findBy,
+	findById,
+};
+
+function findBy(filter) {
+	return db('users')
+		.where(filter);
+}
+
+async function add(user) {
+	const [id] = await db('users')
+		.insert(user);
+	return findById(id);
+}
+
+function findById(id) {
+	return db('users')
+		.where({ id })
+		.first()
+		.select('id', 'email', 'username');
+}