feat: Implement graphical student ID card generation for user profiles.

src/modules/class/class.service.ts

@@ -25,7 +25,12 @@ export const classService = {
         };
         return tx ? await execute(tx) : await DrizzleClient.transaction(execute);
     },
-
+    getClassBalance: async (classId: bigint) => {
+        const cls = await DrizzleClient.query.classes.findFirst({
+            where: eq(classes.id, classId),
+        });
+        return cls?.balance || 0n;
+    },
     modifyClassBalance: async (classId: bigint, amount: bigint, tx?: any) => {
         const execute = async (txFn: any) => {
             const cls = await txFn.query.classes.findFirst({

src/modules/user/user.service.ts

@@ -32,6 +32,13 @@ export const userService = {
         };
         return tx ? await execute(tx) : await DrizzleClient.transaction(execute);
     },
+    getUserClass: async (id: string) => {
+        const user = await DrizzleClient.query.users.findFirst({
+            where: eq(users.id, BigInt(id)),
+            with: { class: true }
+        });
+        return user?.class;
+    },
     createUser: async (id: string | bigint, username: string, classId?: bigint, tx?: any) => {
         const execute = async (txFn: any) => {
             const [user] = await txFn.insert(users).values({