feat: implement basic balance command

app/src/commands/economy/balance.ts

@@ -0,0 +1,13 @@
+import type { Command } from "@lib/types";
+import { getUserBalance } from "@/modules/economy/economy.service";
+import { SlashCommandBuilder, EmbedBuilder } from "discord.js";
+
+export const balance: Command = {
+    data: new SlashCommandBuilder().setName("balance").setDescription("Check your balance"),
+    execute: async (interaction) => {
+        const balance = await getUserBalance(interaction.user.id) || 0;
+        const embed = new EmbedBuilder().setDescription(`Your balance is ${balance}`);
+        await interaction.reply({ embeds: [embed] });
+    }
+};
+

app/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));
+}