Compute Engine disk snapshot is not outdated

resource "google_compute_resource_policy" "snapshot_schedule" {
  name   = "snapshot-schedule-with-retention"
  region = var.region

  snapshot_schedule_policy {
    schedule {
      daily_schedule {
        days_in_cycle = 1
        start_time    = "04:00"
      }
    }

    # Automatically delete snapshots older than 90 days
    retention_policy {
      max_retention_days    = 90
      on_source_disk_delete = "KEEP_AUTO_SNAPSHOTS"
    }
  }
}

resource "google_compute_disk_resource_policy_attachment" "attachment" {
  name = google_compute_resource_policy.snapshot_schedule.name
  disk = google_compute_disk.example.name
  zone = var.zone
}