Refactor code structure for improved readability and maintainability

prisma/schema/application/consumer_account_device.prisma

@@ -0,0 +1,14 @@
+model ConsumerAccountDevice {
+  id          String  @id @default(ulid())
+  device_id   String  @unique
+  device_name String?
+
+  created_at DateTime @default(now()) @db.Timestamp(0)
+  updated_at DateTime @updatedAt @db.Timestamp(0)
+
+  consumer_account_id String          @unique
+  consumer_account    ConsumerAccount @relation(fields: [consumer_account_id], references: [id])
+
+  @@index([consumer_account_id])
+  @@map("consumer_account_device")
+}