public Task<SnapDataRequest> healFlatDatabase(final Task<SnapDataRequest> task) {
    return healFlatDatabase(List.of(task)).get(0);
  }
This method will heal the local flat database if necessary and persist it

@param tasks range to heal and/or persist
@return completed tasks
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/snapsync/PersistDataStep.java