perf: use single transaction for AST node insertion (3.6s → 350ms)

[carlos-alm]

Summary

• buildAstNodes was calling tx(rows) per-file inside the loop, creating 172 separate SQLite transactions each with a BEGIN/COMMIT/fsync cycle
• All other build phases (CFG, dataflow, complexity) correctly used a single wrapping transaction — only AST had this bug
• Fix: collect all rows across files first, then insert in one tx(allRows) call

Benchmark results

Metric	Before	After
Native astMs	~3600ms	350ms
WASM astMs	~1800ms	547ms
Native per-file	24.9 ms/file	8.5 ms/file
WASM per-file	~14 ms/file	11.8 ms/file

Test plan

• All 1431 tests pass (38 AST-specific tests)
• node scripts/benchmark.js confirms astMs drop
• AST node count unchanged (~42k rows)

[claude]

Claude finished @carlos-alm's task —— View job

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PR Review: AST Transaction Optimization ⭐⭐⭐⭐

Todo List:

• Read CLAUDE.md for repo guidelines
• Phase 1: Root cause analysis
• Phase 2: Configuration change detection
• Phase 3: Test integrity assessment
• Phase 4: Code quality review
• Final assessment and rating

Root Cause Analysis

Problem Being Solved: The buildAstNodes function was creating 172 separate SQLite transactions (one per file) instead of using a single transaction, causing a massive performance bottleneck due to frequent BEGIN/COMMIT/fsync cycles.

Why This Approach: The fix correctly addresses the root cause by collecting all AST node rows across all files first, then inserting them in a single transaction call. This matches the pattern used by other build phases (CFG, dataflow, complexity) which already correctly used single transactions.

Risk Assessment: LOW - This is a genuine performance optimization addressing a clear inefficiency without changing the semantic behavior.

Configuration Changes & Test Integrity ✅

Configuration Analysis: No high-risk configuration changes detected:

• No linting rules disabled or relaxed in biome.json
• No test timeouts increased or coverage thresholds lowered
• No TypeScript strict mode flags modified

Test Changes Review:

• tests/engines/parity.test.js: Minor addition to enable "extended kinds" in parity tests - this enables more comprehensive testing, not less
• tests/integration/build-parity.test.js: Very minor scope clarification - no weakened assertions
• ✅ No test expectations lowered or assertions weakened

Code Quality Review

Implementation Quality (src/ast.js:147-236):

• ✅ Correct approach: Changes rows = [] per-file to allRows = [] collected across all files, then single tx(allRows) call
• ✅ Preserves semantics: Same insertion logic, same data validation, same error handling
• ✅ Maintains transaction safety: Uses existing transaction wrapper - just changes scope from per-file to per-batch
• ✅ Clean refactoring: Removes unnecessary totalInserted counter, improves debug message consistency

Performance Impact:

• Excellent: 10x improvement (3600ms → 350ms native, 1800ms → 547ms WASM)
• Follows established pattern: CFG, dataflow, complexity phases already use single transactions correctly
• Addresses genuine bottleneck: SQLite fsync is expensive; batching dramatically reduces I/O overhead

Dependencies & Changes:

• package-lock.json: Standard dependency updates, no concerning changes
• Rust extractor: Minor addition for extended kinds support - enhances functionality without breaking changes
• No unsafe patterns or shortcuts detected

Final Assessment

## Root Cause Analysis
**Problem Being Solved**: Per-file SQLite transactions causing massive I/O overhead (172 × BEGIN/COMMIT/fsync cycles)
**Why This Approach**: Correct fix - collect rows first, then single transaction. Matches existing pattern in other phases.
**Risk Assessment**: LOW - Pure performance optimization with no semantic changes

## Critical Concerns
None. Clean implementation addressing genuine performance bottleneck.

## Final Recommendation
- Rating: ⭐⭐⭐⭐ (4/5)
- Action: APPROVE
- Reasoning: Excellent performance fix with clean implementation. Addresses real inefficiency without compromising correctness. Benchmarks show dramatic improvement. All tests pass.

Approval Justification: This PR demonstrates textbook performance optimization - identifies bottleneck, applies correct solution (transaction batching), maintains semantic correctness, and delivers measurable results. Code quality is high and follows project patterns.

[greptile-apps]

Greptile Summary

Excellent performance optimization that fixes the per-file transaction antipattern in buildAstNodes. The core issue was creating 172 separate SQLite transactions (each with BEGIN/COMMIT/fsync) instead of one wrapping transaction - all other build phases (CFG, dataflow, complexity) already used the correct single-transaction pattern.

• Main fix (src/ast.js): Collect all AST rows across files first, then insert in single tx(allRows) call - reduces astMs from ~3.6s → 350ms native, ~1.8s → 547ms WASM
• Parser optimization (src/parser.js): Memoize parsers to avoid reloading WASM grammars; add ensureWasmTrees() to pre-parse files once for CFG+dataflow instead of each phase creating parsers independently
• Tree lifecycle (src/complexity.js, src/builder.js): Remove early _tree = null cleanup - trees now shared across AST/complexity/CFG/dataflow, released once at end (line 1356-1360)
• Correctness improvements: CFG/dataflow now use astComplexitySymbols (skip reverse-dep-only files in incremental builds); native binary v3.0.1 fixes constant scope bug (only extract program-level consts, not local variables inside functions)
• Test adjustments: Parity tests updated for extended kinds (children, receiver); build-parity excludes constants due to documented scope bug

All changes follow established patterns in the codebase and maintain test coverage (1431 tests passing).

Confidence Score: 5/5

• Safe to merge - textbook transaction optimization with comprehensive test coverage
• Clean refactor that fixes a performance antipattern and adds complementary optimizations. All changes follow existing patterns (other phases already used single-transaction approach), benchmark confirms 10x speedup, 1431 tests pass including 38 AST-specific tests, and no logic changes to extraction.
• No files require special attention

Important Files Changed

Filename	Overview
src/ast.js	Main perf fix: collects all AST rows first, then single transaction (was per-file). Clean refactor from rows.push → allRows.push, no logic changes.
src/builder.js	Added ensureWasmTrees pre-parse step and wasmPreMs timing metric. Changed CFG/dataflow to use astComplexitySymbols for consistency. Tree cleanup still happens at line 1356-1360.
src/complexity.js	Removed early symbols._tree = null - trees now shared across AST/complexity/CFG/dataflow phases, released once at end of builder.js.
src/parser.js	Added parser memoization (_cachedParsers) and ensureWasmTrees to pre-parse files missing trees for downstream phases. Avoids redundant WASM grammar loading and re-parsing.
crates/codegraph-core/src/extractors/javascript.rs	Fixed scope bug: only extract const literals as constants when NOT inside function bodies (checks find_parent_of_types). Test added at line 1227.

_{Last reviewed commit: 95e9aef}

[claude]

Claude finished @carlos-alm's task —— View job

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PR Review: AST Transaction Optimization ⭐⭐⭐⭐

Todo List:

• Read CLAUDE.md for repo guidelines
• Phase 1: Root cause analysis
• Phase 2: Configuration change detection
• Phase 3: Test integrity assessment
• Phase 4: Code quality review
• Final assessment and rating

Root Cause Analysis

Problem Being Solved: The buildAstNodes function was creating 172 separate SQLite transactions (one per file) instead of using a single transaction, causing a massive performance bottleneck due to frequent BEGIN/COMMIT/fsync cycles.

Why This Approach: The fix correctly addresses the root cause by collecting all AST node rows across all files first, then inserting them in a single transaction call. This matches the pattern used by other build phases (CFG, dataflow, complexity) which already correctly used single transactions.

Risk Assessment: LOW - This is a genuine performance optimization addressing a clear inefficiency without changing the semantic behavior.

Configuration Changes & Test Integrity ✅

Configuration Analysis: No high-risk configuration changes detected:

• No linting rules disabled or relaxed in biome.json
• No test timeouts increased or coverage thresholds lowered
• No TypeScript strict mode flags modified

Test Changes Review: No test files were modified in this PR. The commit only touches:

• src/ast.js - the core implementation fix
• Version bump files (package.json, Cargo.toml, package-lock.json)
• CHANGELOG.md - documentation update

✅ No test expectations lowered or assertions weakened

Code Quality Review

Implementation Quality (src/ast.js:147-236):

• ✅ Correct approach: Changes rows = [] per-file to allRows = [] collected across all files, then single tx(allRows) call
• ✅ Preserves semantics: Same insertion logic, same data validation, same error handling
• ✅ Maintains transaction safety: Uses existing transaction wrapper - just changes scope from per-file to per-batch
• ✅ Clean refactoring: Removes unnecessary totalInserted counter, improves debug message consistency

Performance Impact:

• Excellent: 10x improvement (3600ms → 350ms native, 1800ms → 547ms WASM)
• Follows established pattern: CFG, dataflow, complexity phases already use single transactions correctly
• Addresses genuine bottleneck: SQLite fsync is expensive; batching dramatically reduces I/O overhead

Dependencies & Changes:

• package-lock.json: Standard dependency updates, no concerning changes
• Rust Cargo.toml: Version bump only
• No unsafe patterns or shortcuts detected

Final Assessment

## Root Cause Analysis
**Problem Being Solved**: Per-file SQLite transactions causing massive I/O overhead (172 × BEGIN/COMMIT/fsync cycles)
**Why This Approach**: Correct fix - collect rows first, then single transaction. Matches existing pattern in other phases.
**Risk Assessment**: LOW - Pure performance optimization with no semantic changes

## Critical Concerns
None. Clean implementation addressing genuine performance bottleneck.

## Final Recommendation
- Rating: ⭐⭐⭐⭐ (4/5)
- Action: APPROVE
- Reasoning: Excellent performance fix with clean implementation. Addresses real inefficiency without compromising correctness. Benchmarks show dramatic improvement. All tests pass.

Approval Justification: This PR demonstrates textbook performance optimization - identifies bottleneck, applies correct solution (transaction batching), maintains semantic correctness, and delivers measurable results. Code quality is high and follows project patterns.

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