feat: Initialize database and restructure application source code.

src/modules/economy/economy.service.ts

@@ -0,0 +1,12 @@
+import { DrizzleClient } from "@lib/DrizzleClient";
+import { users } from "@/db/schema";
+import { eq } from "drizzle-orm";
+
+export async function getUserBalance(userId: string) {
+    const user = await DrizzleClient.query.users.findFirst({ where: eq(users.userId, userId) });
+    return user?.balance ?? 0;
+}
+
+export async function setUserBalance(userId: string, balance: number) {
+    await DrizzleClient.update(users).set({ balance }).where(eq(users.userId, userId));
+}

src/modules/users/users.service.ts

@@ -0,0 +1,11 @@
+import { DrizzleClient } from "@lib/DrizzleClient";
+import { users } from "@/db/schema";
+import { eq } from "drizzle-orm";
+
+export async function getUserById(userId: string) {
+    return await DrizzleClient.query.users.findFirst({ where: eq(users.userId, userId) });
+}
+
+export async function createUser(userId: string) {
+    return (await DrizzleClient.insert(users).values({ userId }).returning())[0]!;
+}