diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 2384edb..485d393 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -103,7 +103,7 @@ model BudgetRule {
 model CsvUpload {
   id            String        @id @default(cuid())
   accountId     String
-  account       Account       @relation(fields: [accountId], references: [id])
+  account       Account       @relation(fields: [accountId], references: [id], onDelete: Cascade)
   fileName      String
   rowCount      Int
   importedCount Int
diff --git a/src/app/api/accounts/[id]/route.ts b/src/app/api/accounts/[id]/route.ts
index 97383fa..502b203 100644
--- a/src/app/api/accounts/[id]/route.ts
+++ b/src/app/api/accounts/[id]/route.ts
@@ -58,6 +58,7 @@ export async function DELETE(_req: Request, { params }: Params) {
   })
   if (!existing) return NextResponse.json({ error: 'Not found' }, { status: 404 })
 
+  await prisma.csvUpload.deleteMany({ where: { accountId: id } })
   await prisma.account.delete({ where: { id } })
   return new NextResponse(null, { status: 204 })
 }