Add lots of things

drill-and-practice/services/authService.js

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+import { sql } from "../database/database.js";
+
+const findUser = async (email) => {
+  return await sql`SELECT * FROM users WHERE email = ${email}`;
+};
+
+const createUser = async (email, password) => {
+  return await sql`INSERT INTO users (email, password) VALUES (${email}, ${password})`;
+};
+
+export { findUser, createUser };

drill-and-practice/services/questionService.js

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+import { sql } from "../database/database.js";
+
+const countQuestions = async () => {
+  const result = await sql`SELECT COUNT(id) FROM questions`;
+  return result.rows[0].count;
+};
+
+const getQuestionsByTopicId = async (topicId) => {

drill-and-practice/services/topicService.js

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+import { sql } from "../database/database.js";
+
+const addTopic = async (userId, name) => {
+  await sql`INSERT INTO topics (user_id, name) VALUES (${userId}, ${name})`;
+};
+
+const countTopics = async () => {
+  const result = await sql`SELECT COUNT(id) FROM topics`;
+  return result.rows[0].count;
+};
+
+const getAllTopics = async () => {
+  await sql`SELECT * FROM topics ORDER BY name ASC`;
+  return result.rows;
+};
+
+const getTopicsByUserId = async (userId) => {
+  const result =
+    await sql`SELECT * FROM topics WHERE user_id = ${userId} ORDER BY name ASC`;
+  return result.rows;
+};
+
+const getTopicByTopicId = async (topicId) => {
+  const result = await sql`SELECT * FROM topics WHERE id = ${topicId}`;
+  return result.rows[0];
+};
+
+const deleteTopic = async (topicId) => {
+  await sql`DELETE FROM topics WHERE id = ${topicId}`;
+};
+
+export {
+  addTopic,
+  countTopics,
+  getAllTopics,
+  getTopicsByUserId,
+  getTopicByTopicId,
+  deleteTopic,
+};