Type Alias WorkerBlockMap 

pub type WorkerBlockMap = FxHashMap<SequenceHash, (usize, ContentHash, SequenceHash)>;

Per-worker reverse lookup: backend_seq_hash → (position, content_hash, prefix_hash). The prefix_hash is the router-computed rolling hash used as the SeqEntry key.

Callers own one WorkerBlockMap per worker and pass it to write-path methods.

Aliased Type

pub struct WorkerBlockMap { /* private fields */ }