skill/query-hf-graphrag/references/schema.md

GraphRAG remote release schema

manifest.json declares primary_key (entry_cid), BM25 constants, vector layout, and compact index descriptors. Verify sha256 / cid before parsing a shard.

Identity

• entry_cid: CIDv1 primary identity.
• document_index: dense 0..N-1 pointer used only inside postings.
• Data shards are Zstandard Parquet with at most 4,096 rows.

BM25

indexes/bm25_keyword_shards.parquet maps inclusive first_key/last_key term ranges to posting shards. Nested posting rows contain term plus aligned document_indices, document_lengths, title_frequencies, body_frequencies, and idf. Posting shards must be globally sorted by term with disjoint ranges; a term never spans two shards. In-memory cells: write_term_sorted_posting_shards. Already-dumped shards (any consumer): pack_range_routed_family at build time or repair_graphrag_range_routing on a release root. Both use the same resource-aware process pool. Exploded (term, legal_id, tf) shards remain readable.

Vectors

indexes/vector_chunks.parquet maps centroid groups to at most two physical shards of 4,096 rows. Probe a few centroids, then exact-score inside those shards.

Graph

indexes/graph_outgoing_adjacency.parquet and indexes/graph_incoming_adjacency.parquet map node_cid ranges to paged adjacency. Each page holds at most 4,096 pointers. Similarity neighbors cannot establish legal authority.