Revert "chore: add index on queuedAt and sentAt (#589)" (#591)

This reverts commit 70392ac.

Author: arcoraven

src/prisma/migrations/20240731184631_add_queued_at_idx/migration.sql

@@ -160,8 +160,6 @@ model Transactions {
   sentAtBlockNumber         Int?      @map("sentAtBlockNumber")
   blockNumber               Int?      @map("blockNumber")
 
-  @@index([queuedAt])
-  @@index([sentAt])
   @@map("transactions")
 }