After 2 weeks of collision/stale-data fixes, reviewed all changes to identify
spurious code that is no longer needed after content-hash resolution was implemented.
**Removed:**
1. countReferences() function from collision.go (lines 274-328)
- Was used for reference-count based collision scoring
- Completely unused after switching to content-hash based resolution (commit 2e87329)
- Still exists in duplicates.go for deduplication (different use case)
2. ReferenceScore field from CollisionDetail struct
- Marked as DEPRECATED but never removed
- No longer used by ScoreCollisions() which now uses content hashing
3. TestCountReferences and TestCountReferencesWordBoundary tests
- Tested the now-deleted countReferences() function
- No longer relevant
**Fixed:**
- Updated CheckpointWAL comments to remove misleading "staleness detection" claim
- Staleness detection uses metadata (last_import_time), NOT file mtime
- CheckpointWAL is still valuable for data persistence and WAL size reduction
- Comments now accurately reflect actual benefits
**Verified:**
- All tests pass (internal/storage/sqlite)
- Content-hash collision resolution still works correctly
- No behavioral changes, just cleanup
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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