@Override
  protected int doPersist(
      final WorldStateStorageCoordinator worldStateStorageCoordinator,
      final WorldStateKeyValueStorage.Updater updater,
      final SnapWorldDownloadState downloadState,
      final SnapSyncProcessState snapSyncState,
      final SnapSyncConfiguration snapSyncConfiguration) {

    if (!isProofValid) {
      // If the proof is not valid, it indicates that the flat database needs to be fixed.

      final BonsaiWorldStateKeyValueStorage.Updater bonsaiUpdater =
          (BonsaiWorldStateKeyValueStorage.Updater) updater;

      final MerkleTrie<Bytes, Bytes> storageTrie =
          new StoredMerklePatriciaTrie<>(
              (location, hash) ->
                  worldStateStorageCoordinator.getAccountStorageTrieNode(
                      accountHash, location, hash),
              storageRoot,
              Function.identity(),
              Function.identity());

      Map<Bytes32, Bytes> flatDbSlots = new TreeMap<>(slots);

      // Retrieve the data from the trie in order to know what needs to be fixed in the flat
      // database
      final RangeStorageEntriesCollector collector =
          RangeStorageEntriesCollector.createCollector(
              startKeyHash,
              slots.isEmpty() ? endKeyHash : slots.lastKey(),
              slots.isEmpty()
                  ? snapSyncConfiguration.getLocalFlatStorageCountToHealPerRequest()
                  : Integer.MAX_VALUE,
              Integer.MAX_VALUE);
      final TrieIterator<Bytes> visitor = RangeStorageEntriesCollector.createVisitor(collector);
      slots =
          (TreeMap<Bytes32, Bytes>)
              storageTrie.entriesFrom(
                  root ->
                      RangeStorageEntriesCollector.collectEntries(
                          collector, visitor, root, startKeyHash));

      // Process each slot
      slots.forEach(
          (key, value) -> {
            // Remove the key from the flat db and get its associated value
            final Bytes flatDbEntry = flatDbSlots.remove(key);
            // If the key was not in flat db and its associated value is different from the
            // current value
            if (!value.equals(flatDbEntry)) {
              // Update the storage value
              bonsaiUpdater.putStorageValueBySlotHash(
                  accountHash, Hash.wrap(key), Bytes32.leftPad(RLP.decodeValue(value)));
            }
          });
      // For each remaining key, remove the storage value
      flatDbSlots
          .keySet()
          .forEach(key -> bonsaiUpdater.removeStorageValueBySlotHash(accountHash, Hash.wrap(key)));
    }
    return slots.size();
  }
The StorageFlatDatabaseHealingRangeRequest class represents a request to heal a range of storage
in the flat databases. It encapsulates the necessary information to identify the range and
initiate the healing process.
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/snapsync/request/heal/StorageFlatDatabaseHealingRangeRequest.java