docs(06-03): complete lookupChunk migration & SAFETY comments plan

- SUMMARY.md with execution results and self-check - STATE.md updated: Phase 6 complete (3/3 plans), decisions recorded - ROADMAP.md updated: Phase 6 marked Complete - REQUIREMENTS.md: QUAL-03 and QUAL-04 marked complete
2026-03-04 19:36:00 -05:00
parent 7dfe003e63
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+---
+phase: 06-sql-consolidation-code-quality
+plan: 03
+subsystem: database
+tags: [sqlite, sqlc, fts5, sql-safety, code-quality]
+
+# Dependency graph
+requires:
+  - phase: 06-sql-consolidation-code-quality
+    provides: "track_metadata VIEW for sqlc query migration"
+provides:
+  - "sqlc-generated LookupTrackMetaByPaths query with sqlc.slice()"
+  - "SAFETY comments on all 12 hand-crafted SQL statements"
+affects: [07-performance-startup-optimization]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: ["sqlc.slice() for variable-length IN clauses", "SAFETY comment convention for hand-crafted SQL"]
+
+key-files:
+  created: []
+  modified:
+    - "backend/database/sql/queries/audio_files.sql"
+    - "backend/database/sql/sqlcgen/audio_files.sql.go"
+    - "backend/queue/persistence.go"
+    - "backend/database/search.go"
+    - "backend/library/library.go"
+    - "backend/library/rescan.go"
+
+key-decisions:
+  - "Used sqlc.slice() with track_metadata VIEW for type-safe batch lookups"
+  - "Preserved chunking at maxSQLiteVars=900 since sqlc.slice() does not auto-chunk"
+  - "Two-part SAFETY comment format: why sqlc can't handle it + what makes it safe"
+
+patterns-established:
+  - "SAFETY comment convention: // SAFETY: [reason sqlc can't handle] + [safety assurance]"
+  - "Cross-reference pattern: library.go/rescan.go SAFETY comments reference search.go canonical implementations"
+
+requirements-completed: [QUAL-03, QUAL-04]
+
+# Metrics
+duration: 6min
+completed: 2026-03-05
+---
+
+# Phase 6 Plan 3: SQL Consolidation — lookupChunk Migration & SAFETY Comments Summary
+
+**Migrated queue lookupChunk from fmt.Sprintf IN clause to sqlc-generated LookupTrackMetaByPaths query via track_metadata VIEW, and documented all 12 hand-crafted SQL statements with // SAFETY: comments**
+
+## Performance
+
+- **Duration:** 6 min
+- **Started:** 2026-03-05T00:27:52Z
+- **Completed:** 2026-03-05T00:34:10Z
+- **Tasks:** 2
+- **Files modified:** 7
+
+## Accomplishments
+- Replaced hand-crafted `fmt.Sprintf` IN clause in `lookupChunk` with sqlc-generated `LookupTrackMetaByPaths` query using `sqlc.slice()` and `track_metadata` VIEW
+- Added `// SAFETY:` comments to all 12 hand-crafted SQL statements across 4 files (7 in search.go, 3 in library.go, 1 in rescan.go, 1 in persistence.go)
+- All existing tests pass unchanged: database (15), library (13), queue (29) — all with `-race`
+- Zero hand-crafted SQL in lookupChunk; the only remaining hand-crafted SQL in queue is `insertTrackBatch` (documented with SAFETY comment)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Migrate lookupChunk to sqlc with sqlc.slice()** - `2221a68` (feat)
+2. **Task 2: Add SAFETY comments to all hand-crafted SQL** - `7dfe003` (docs)
+
+## Files Created/Modified
+- `backend/database/sql/queries/audio_files.sql` - Added LookupTrackMetaByPaths query using track_metadata VIEW
+- `backend/database/sql/sqlcgen/audio_files.sql.go` - sqlc-generated Go code for LookupTrackMetaByPaths
+- `backend/queue/persistence.go` - lookupChunk now uses sqlc query; insertTrackBatch has SAFETY comment
+- `backend/database/search.go` - 7 SAFETY comments on all FTS5 operations
+- `backend/library/library.go` - 3 SAFETY comments on FTS5 INSERT/DELETE in commitNewAudioFile and updateAudioFileMetadata
+- `backend/library/rescan.go` - 1 SAFETY comment on FTS5 DELETE in clearAllLibraryData
+
+## Decisions Made
+- Used `sqlc.slice()` with `track_metadata` VIEW — the VIEW already provides the exact columns needed (id, file_path, title, artist_name), eliminating the need for an inline JOIN
+- Preserved `lookupTrackMetaBatch` chunking at `maxSQLiteVars` (900) because `sqlc.slice()` does NOT auto-chunk large parameter lists
+- Two-part SAFETY comment format: (1) why sqlc can't handle it, (2) what makes the query safe — makes it clear these are intentional exceptions, not oversights
+- Cross-references in library.go/rescan.go point back to canonical search.go implementations to avoid divergent documentation
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Phase 6 complete: all 3 plans executed (VIEW consolidation, event codegen, SAFETY comments)
+- All hand-crafted SQL documented; future maintainers can see why each exception exists
+- Ready for Phase 7 (performance/startup optimization)
+
+## Self-Check: PASSED
+
+All created/modified files exist on disk. All commit hashes verified in git log.
+
+---
+*Phase: 06-sql-consolidation-code-quality*
+*Completed: 2026-03-05*