---
phase: 17-schema-v4-chunk-data-layer
verified: 2026-02-24T13:00:00Z
status: passed
score: 11/11 must-haves verified
re_verification: false
---

# Phase 17: Schema v4 Chunk Data Layer — Verification Report

**Phase Goal:** Establish the zero-hallucination line-range contract (CHUNK-01) — every indexed chunk carries its exact source text, name, and line boundaries.
**Verified:** 2026-02-24T13:00:00Z
**Status:** PASSED
**Re-verification:** No — initial verification

---

## Goal Achievement

### Observable Truths (from Plan 17-02 must_haves)

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | All RED tests from Plan 17-01 pass GREEN | VERIFIED | `uv run pytest tests/ -q`: 330 passed, 0 failed |
| 2 | ChunkRecord.model_fields includes chunk_name (str, default '') and chunk_text (str, default '') | VERIFIED | `schema.py` lines 195–206: `chunk_name: str = ""` and `chunk_text: str = ""` |
| 3 | ensure_schema_v4(table) adds chunk_name and chunk_text columns; calling twice raises no error | VERIFIED | `schema.py` lines 72–86; TestEnsureSchemaV4 (3 tests) all pass |
| 4 | chunk_markdown() returns dicts with chunk_name = heading line verbatim and chunk_text = section text | VERIFIED | `chunker.py` lines 85–91 (no-heading path) and lines 131–137 (normal path); 2 tests pass |
| 5 | chunk_python() returns dicts with chunk_name = function/class name and chunk_text = raw lines slice | VERIFIED | `chunker.py` lines 250–257; 2 tests pass |
| 6 | chunk_typescript() returns dicts with chunk_name (existing) and chunk_text = raw source slice | VERIFIED | `ts_chunker.py` lines 154–161 (export-default) and lines 196–203 (main path) |
| 7 | _enforce_char_limit carries chunk_name and chunk_text through to sub-chunks unchanged | VERIFIED | `chunker.py` lines 282–283 (parent extraction), 294–300, 306–312, 319–325, 335–341 (all 4 append sites carry chunk_name/chunk_text) |
| 8 | Indexer stores chunk_name and chunk_text in LanceDB for all three file types | VERIFIED | `indexer.py` lines 456–457: `chunk.get("chunk_name", "")` and `chunk.get("chunk_text", "")` in chunk_dict |
| 9 | Round-trip test: start_line, end_line, chunk_name, chunk_text all correct in stored rows | VERIFIED | `test_round_trip.py` 3 parametrised cases (md, py, ts) all PASS |
| 10 | All 320 pre-existing tests remain green | VERIFIED | Total suite: 330 passed; 330 = 319 pre-existing + 11 new v4 tests |
| 11 | ruff check . exits 0 and mypy src/ exits 0 | VERIFIED | Both tools report clean; confirmed via direct execution |

**Score:** 11/11 truths verified

---

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/corpus_analyzer/store/schema.py` | ensure_schema_v4() function + ChunkRecord chunk_name and chunk_text fields | VERIFIED | `ensure_schema_v4` at line 72; `chunk_name: str = ""` at line 195; `chunk_text: str = ""` at line 201 |
| `src/corpus_analyzer/ingest/chunker.py` | chunk_markdown and chunk_python emit chunk_name + chunk_text; _enforce_char_limit carries them | VERIFIED | All emit sites confirmed; all 4 sub-chunk paths in _enforce_char_limit carry both fields |
| `src/corpus_analyzer/ingest/ts_chunker.py` | chunk_typescript emits chunk_text (chunk_name already present) | VERIFIED | Both append sites (main branch line 197–203, export-default line 155–161) include chunk_text |
| `src/corpus_analyzer/ingest/indexer.py` | CorpusIndex calls ensure_schema_v4; chunk_dict includes chunk_name and chunk_text | VERIFIED | Line 33: `ensure_schema_v4` in import; line 153: `ensure_schema_v4(table)` called; lines 456–457: both fields in chunk_dict |
| `tests/store/test_schema.py` | Updated test_all_required_fields_present + new TestEnsureSchemaV4 class | VERIFIED | Lines 139–140 add chunk_name/chunk_text to expected set; TestEnsureSchemaV4 (3 tests) at lines 205–241 |
| `tests/ingest/test_chunker.py` | Assertions that chunk_markdown and chunk_python return chunk_name and chunk_text keys | VERIFIED | 4 new tests: test_chunk_markdown_emits_chunk_name (line 103), test_chunk_markdown_emits_chunk_text (line 112), test_chunk_python_emits_chunk_name (line 212), test_chunk_python_emits_chunk_text (line 221) |
| `tests/ingest/test_round_trip.py` | Parametrised zero-hallucination round-trip test for Markdown, Python, TypeScript | VERIFIED | File exists; 3 parametrised cases; all pass |

---

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `indexer.py` | `store/schema.py` | ensure_schema_v4 import and call in CorpusIndex.open() | WIRED | Import line 33; call line 153 in `open()` |
| `indexer.py` | `ingest/chunker.py` | chunk.get('chunk_name', '') and chunk.get('chunk_text', '') in chunk_dict | WIRED | Lines 456–457 in `index_source()` |
| `indexer.py` | `ingest/ts_chunker.py` | same chunk.get pattern for TypeScript chunks | WIRED | TypeScript chunks flow through same chunk_dict construction; chunk_text populated by ts_chunker |
| `test_round_trip.py` | `corpus_analyzer.ingest.indexer.CorpusIndex` | index_source then direct LanceDB table query | WIRED | Lines 71–96: CorpusIndex.open() called, index_source called, `index._table.search().limit(20).to_list()` used |
| `test_schema.py` | `corpus_analyzer.store.schema.ChunkRecord` | ChunkRecord.model_fields check | WIRED | Lines 142–143: `set(ChunkRecord.model_fields.keys())` assertion |

---

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|----------|
| CHUNK-01 | 17-01, 17-02 | ChunkRecord schema v4: start_line, end_line, chunk_name, chunk_text persisted in LanceDB; ensure_schema_v4() idempotent migration; existing rows default chunk_name="", chunk_text="" | SATISFIED | ChunkRecord has all four fields (start_line/end_line pre-existed; chunk_name/chunk_text added by Phase 17). ensure_schema_v4() adds chunk_name and chunk_text with cast('' as string) defaults; idempotency verified by TestEnsureSchemaV4::test_ensure_schema_v4_is_idempotent. Round-trip tests confirm all three chunkers populate fields in LanceDB. Note: the requirement states "existing rows default to start_line=0, end_line=0" — start_line/end_line are pre-existing required int fields in ChunkRecord with no Python-level default; they were populated correctly before Phase 17. The RESEARCH explicitly confirms this is intentional and correct: only chunk_name and chunk_text needed migration via ensure_schema_v4(). |

**Orphaned requirements check:** REQUIREMENTS.md maps only CHUNK-01 to Phase 17. No orphaned requirements.

---

### Anti-Patterns Found

None. Scanned all four production files and three test files. No TODOs, FIXMEs, placeholder returns, or stub implementations found. All implementations are substantive.

---

### Human Verification Required

None. All Phase 17 truths are verifiable programmatically:
- Schema field presence: checked via model_fields
- Migration function: exercised by TestEnsureSchemaV4
- Chunker field emission: exercised by TestChunkMarkdown/TestChunkPython/TestChunkTypeScript
- End-to-end contract: exercised by test_round_trip_chunk_fields (md, py, ts)
- Linting and type correctness: ruff and mypy both pass

---

### Gaps Summary

No gaps. All 11 must-have truths verified. The zero-hallucination line-range contract for CHUNK-01 is fully implemented:

- ChunkRecord carries chunk_name and chunk_text as non-nullable string fields with empty-string defaults
- ensure_schema_v4() provides idempotent migration for existing LanceDB tables
- All three chunkers (Markdown, Python, TypeScript) emit chunk_name and chunk_text in returned dicts
- _enforce_char_limit preserves chunk_name and chunk_text across all sub-chunk split paths
- CorpusIndex.open() calls ensure_schema_v4() and index_source() stores both fields in LanceDB
- Round-trip tests confirm exact values for .md, .py, and .ts fixtures
- 330 tests passing; ruff and mypy clean

---

_Verified: 2026-02-24T13:00:00Z_
_Verifier: Claude (gsd-verifier)_
