When a single record payload exceeds 65KB (max_local=65501), the writer
now splits it across overflow pages per SQLite's B-tree spec instead of
underflowing the content_offset and corrupting memory.
Closes#139, closes#187.
Based on #175 by dLo999.
Co-Authored-By: Dustin Obrecht <dustin@kurtnoble.com>
Major quality improvement: replace random index vectors with pre-trained
Nomic nomic-embed-code token embeddings. Tokens like 'error' and 'exception' now start
with similar vectors (learned from millions of code repos) instead of
arbitrary random projections. Co-occurrence enrichment adds project-specific
context on top.
Architecture:
- vendored/nomic/code_vectors.bin: 37.7MB raw int8 vectors
- vendored/nomic/code_vectors_blob.S: assembler .incbin (instant build)
- vendored/nomic/code_vectors.h: extern declarations + pretrained_vec_at()
- vendored/nomic/code_tokens.h: 40856 token strings (575KB)
- semantic.c: cbm_sem_random_index() now looks up pretrained vectors first,
falls back to sparse random for unknown tokens
- CBM_SEM_DIM raised from 256 to 768 to match Nomic nomic-embed-code
Also: RRI (Reflective Random Indexing), code pattern vocabulary injection,
120+ abbreviation expansions, callee/caller/body token enrichment,
label filter (Function/Method/Class only) in vector search SQL.
Binary size: 136MB → 169MB (+33MB from embedded vectors).
Search quality: keyword queries return relevant error-handling functions.
Domain-specific keyword queries return the expected functions.
Vector search pipeline (end-to-end):
- store.c: cbm_cosine_i8 custom SQLite function (int8 dot product with
sqrt magnitude), registered at store open time
- store.c: cbm_store_vector_search() builds merged query vector from
keywords via base RI vectors (xxHash), int8-quantizes, runs SQL query
with JOIN nodes ON node_id = id for metadata
- mcp.c: search_graph gains semantic_query param (array of strings),
returns semantic_results alongside regular results
- sqlite_writer.c: fixed build_vector_record to include node_id in
record body (matches build_node_record pattern)
- mcp.c: use yyjson_mut_obj_add_strcpy (not add_str) to avoid
use-after-free when vector results are freed before JSON serialization
Quality note: base RI vectors at query time don't capture co-occurrence
enrichment — results are moderate quality. Storing enriched token vectors
would improve this significantly (future work).
Enforce WarningsAsErrors: '*' with zero suppressions of entire check categories.
All non-FP warnings fixed at source; true false positives get per-instance NOLINT
with reasoning. Fixes include: braces around statements (1679), isolate declarations
(75), explicit casts for multilevel pointer conversions, missing includes, function
parameter documentation via NOLINT, and proper NOLINTBEGIN/NOLINTEND nesting.
Complete C implementation of the indexing pipeline (src/), parallel worker
pool, graph buffer with merge support, SQLite writer, and 1893-test suite.
Linter setup: zero warnings from clang-tidy (all checks enabled, no NOLINT
suppressions), cppcheck, and clang-format. All issues fixed at source —
proper headers for external linkage, GROW_ARRAY macro restructured to
eliminate type parameter, null-deref paths guarded, named intermediates
for suspicious-argument checks.
