@Override
  public void putFlatAccountStorageValueByStorageSlotHash(
      final SegmentedKeyValueStorageTransaction transaction,
      final Hash accountHash,
      final Hash slotHash,
      final Bytes storage) {
    transaction.put(
        ACCOUNT_STORAGE_STORAGE,
        Bytes.concatenate(accountHash, slotHash).toArrayUnsafe(),
        storage.toArrayUnsafe());
  }
This class represents a FlatDbReaderStrategy, which is responsible for reading and writing data
from flat databases. It implements various methods for storing and retrieving account data, code
data, and storage data from the corresponding KeyValueStorage.
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/trie/pathbased/bonsai/storage/flat/BonsaiFlatDbStrategy.java