docs(12-02): record deferred bulk phantom matching improvement in STATE.md

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2026-03-13 22:22:37 -04:00
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@@ -132,6 +132,10 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns
- Orphan cleanup must not delete shared entities across libraries (reference-counting bottom-up)
- Existing user migration must be seamless (TOML DirectoryPath to DB libraries table)
### Deferred Improvements
- **Bulk phantom matching performance** — `FindPhantomMatches` runs 3 sequential DB queries per phantom track (basename search, FTS filename, FTS keywords). With hundreds of phantoms this is O(n×3) round trips. Could batch the basename query (WHERE basename IN (...)), pre-load FTS results, or parallelize with goroutines. Not urgent now that the false-phantom bug is fixed (tracks appeared phantom due to empty library root, not actual missing files). Revisit if users import large playlists from external sources with genuinely unresolved paths.
### Research Flags
- **Multi-library research complete** — see `.planning/research/` (STACK.md, FEATURES.md, ARCHITECTURE.md, PITFALLS.md, SUMMARY.md)