Function pop_block 

pub fn pop_block(
    move_to_alt_chain: Option<ChainId>,
    tables: &mut impl TablesMut,
) -> DbResult<(BlockHeight, BlockHash, Block)>

Remove the top/latest block from the database.

The removed block’s data is returned.

If a ChainId is specified the popped block will be added to the alt block tables under that ChainId. Otherwise, the block will be completely removed from the DB.

Errors

This function returns cuprate_database::RuntimeError::KeyNotFound if the input (if applicable) doesn’t exist or other RuntimeError’s on database errors.

In pop_block()’s case, RuntimeError::KeyNotFound will be returned if there are no blocks left.