Function best_relevant_chain_and_history_tree 

fn best_relevant_chain_and_history_tree(
    non_finalized_state: &NonFinalizedState,
    db: &ZebraDb,
    network: &Network,
) -> Result<(Height, Hash, Vec<(CompactDifficulty, DateTime<Utc>)>, Arc<HistoryTree>), BoxError>

Do a consistency check by checking the finalized tip before and after all other database queries.

Returns the best chain tip, recent header difficulties and times in reverse height order, and the tip history tree. Returns an error if the tip obtained before and after is not the same.

Panics

• If we don’t have enough blocks in the state.