model CacheSyncAction {
  id           BigInt   @id @default(autoincrement()) @db.BigInt

  // e.g. 'AD', 'AD_POOL', 'CHANNEL', 'CATEGORY', 'VIDEO_LIST'
  entityType   String   @db.VarChar(50)

  // optional: when operation targets a specific entity
  entityId     BigInt?  @db.BigInt

  // e.g. 'REFRESH', 'INVALIDATE', 'REBUILD_POOL', 'REFRESH_ALL'
  operation    String   @db.VarChar(50)

  // 'PENDING' | 'SUCCESS' | 'FAILED' | 'GAVE_UP'
  status       String   @db.VarChar(20)

  attempts     Int      @default(0)

  // epoch millis as BigInt (your preference)
  nextAttemptAt BigInt? @db.BigInt

  lastError    String?  @db.VarChar(500)

  // for extra info, like { "type": "BANNER" }
  payload      Json?

  createdAt    BigInt   @db.BigInt
  updatedAt    BigInt   @db.BigInt

  @@index([status, nextAttemptAt])
  @@index([entityType, entityId])
}