refactor: replace direct Prisma calls with service layer methods for banking operations

app/api/banking/categories/route.ts

@@ -1,25 +1,12 @@
 import { NextResponse } from "next/server"
-import { prisma } from "@/lib/prisma"
+import { categoryService } from "@/services/category.service"
 import type { Category } from "@/lib/types"
 
 export async function POST(request: Request) {
   try {
-    const category: Omit<Category, "id"> = await request.json()
-
-    const created = await prisma.category.create({
-      data: {
-        name: category.name,
-        color: category.color,
-        icon: category.icon,
-        keywords: JSON.stringify(category.keywords),
-        parentId: category.parentId,
-      },
-    })
-
-    return NextResponse.json({
-      ...created,
-      keywords: JSON.parse(created.keywords),
-    })
+    const data: Omit<Category, "id"> = await request.json()
+    const created = await categoryService.create(data)
+    return NextResponse.json(created)
   } catch (error) {
     console.error("Error creating category:", error)
     return NextResponse.json({ error: "Failed to create category" }, { status: 500 })
@@ -29,22 +16,8 @@ export async function POST(request: Request) {
 export async function PUT(request: Request) {
   try {
     const category: Category = await request.json()
-
-    const updated = await prisma.category.update({
-      where: { id: category.id },
-      data: {
-        name: category.name,
-        color: category.color,
-        icon: category.icon,
-        keywords: JSON.stringify(category.keywords),
-        parentId: category.parentId,
-      },
-    })
-
-    return NextResponse.json({
-      ...updated,
-      keywords: JSON.parse(updated.keywords),
-    })
+    const updated = await categoryService.update(category.id, category)
+    return NextResponse.json(updated)
   } catch (error) {
     console.error("Error updating category:", error)
     return NextResponse.json({ error: "Failed to update category" }, { status: 500 })
@@ -60,20 +33,10 @@ export async function DELETE(request: Request) {
       return NextResponse.json({ error: "Category ID is required" }, { status: 400 })
     }
 
-    // Remove category from transactions (set to null)
-    await prisma.transaction.updateMany({
-      where: { categoryId: id },
-      data: { categoryId: null },
-    })
-
-    await prisma.category.delete({
-      where: { id },
-    })
-
+    await categoryService.delete(id)
     return NextResponse.json({ success: true })
   } catch (error) {
     console.error("Error deleting category:", error)
     return NextResponse.json({ error: "Failed to delete category" }, { status: 500 })
   }
 }
-