yellowjacket/.planning/phases/10-schema-migration/10-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
10-schema-migration	02	database	sqlite sqlc queries phantom-tracks migration-tests multi-library	phase provides 10-schema-migration plan 01 libraries table, audio_files.library_id, playlist_tracks phantom columns, migration 6	sqlc CRUD queries for libraries table (7 queries) Updated playlist queries with phantom metadata support and LEFT JOINs GetTrackPhantomMetadata helper query for eager phantom population Audio file queries filtered by library_id Migration 6 integration tests (5 test functions) NewTestDBWithLibrary helper for downstream test usage	11-per-library-scan 12-library-crud 13-library-views	added patterns LEFT JOIN for nullable FK columns in sqlc queries COALESCE fallback chain: live metadata → phantom metadata → empty string is_phantom computed column via CASE WHEN for phantom track detection NewTestDBWithLibrary helper for tests needing pre-populated library	created modified backend/database/sql/queries/libraries.sql backend/database/sql/sqlcgen/libraries.sql.go backend/database/database_test.go backend/database/sql/queries/audio_files.sql backend/database/sql/queries/playlists.sql backend/database/sql/sqlcgen/audio_files.sql.go backend/database/sql/sqlcgen/playlists.sql.go backend/database/testhelper.go	COALESCE fallback chain for phantom metadata: prefer live data over phantom data over empty string Computed is_phantom column via CASE WHEN rather than requiring callers to check audio_file_id GetPlaylistTrackFilePaths filters out NULLs with audio_file_id IS NOT NULL	LEFT JOIN + COALESCE pattern for nullable FK queries is_phantom computed column pattern for phantom track detection NewTestDBWithLibrary(t, name, path) for integration tests needing libraries	LIB-04 LIB-05	5min	2026-03-09

Phase 10 Plan 2: sqlc Queries & Migration Tests Summary

Library CRUD queries, phantom-aware playlist queries with LEFT JOIN + COALESCE fallback, and 5 migration 6 integration tests

Performance

• Duration: 5 min
• Started: 2026-03-09T13:45:05Z
• Completed: 2026-03-09T13:50:34Z
• Tasks: 2
• Files modified: 9

Accomplishments

• Created 7 library CRUD queries (create, get, get-by-path, list, update, delete, count) with sqlc-generated Go code
• Updated all playlist track queries to use LEFT JOIN for nullable audio_file_id, with COALESCE fallback chain from live metadata to phantom metadata
• Added GetTrackPhantomMetadata helper query for eager phantom population at insert time
• Added is_phantom computed column to GetPlaylistTracksWithMetadata and GetAllPlaylistTracksWithMetadata
• Added GetAudioFilesByLibrary and CountAudioFilesByLibrary queries
• Created 5 comprehensive migration 6 integration tests covering fresh DB, CRUD, phantom tracks, FK enforcement, and VIEW validation
• Added NewTestDBWithLibrary helper for downstream test usage

Task Commits

Each task was committed atomically:

1. Task 1: Add sqlc queries for libraries and update playlist queries - 02548dd (feat)
2. Task 2: Migration integration tests and NewTestDB update - bc15189 (feat)

Files Created/Modified

• backend/database/sql/queries/libraries.sql - 7 CRUD queries for libraries table
• backend/database/sql/queries/playlists.sql - Updated with phantom support, LEFT JOINs, GetTrackPhantomMetadata
• backend/database/sql/queries/audio_files.sql - Added GetAudioFilesByLibrary, CountAudioFilesByLibrary
• backend/database/sql/sqlcgen/libraries.sql.go - Generated Go code for library queries
• backend/database/sql/sqlcgen/playlists.sql.go - Regenerated with phantom columns, is_phantom, LEFT JOINs
• backend/database/sql/sqlcgen/audio_files.sql.go - Regenerated with library filter queries
• backend/database/database_test.go - 5 migration 6 integration tests
• backend/database/testhelper.go - Added NewTestDBWithLibrary helper

Decisions Made

• COALESCE fallback chain: live data → phantom data → empty string ensures callers always get usable values regardless of whether a track is phantom or not
• Added is_phantom as a computed column (CASE WHEN pt.audio_file_id IS NULL THEN 1 ELSE 0 END) to eliminate null-checking logic in callers
• GetPlaylistTrackFilePaths now filters WHERE audio_file_id IS NOT NULL to exclude phantom tracks from file path lists

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Fixed NewTestDBWithLibrary path collision with sentinel library

• Found during: Task 2 (migration tests)
• Issue: Tests using NewTestDBWithLibrary(t, "Test", "/test") collided with the sentinel library at (0, 'Test', '/test') from NewTestDB, causing UNIQUE constraint violation
• Fix: Changed test paths to unique values (/test/music, /test/fk-lib, /test/view-lib) to avoid collision with sentinel
• Files modified: backend/database/database_test.go
• Verification: All 5 TestMigration6 tests pass
• Committed in: bc15189 (Task 2 commit)

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Total deviations: 1 auto-fixed (1 bug) Impact on plan: Minor path collision fix in tests. No scope creep.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Phase 10 complete: schema files, migration 6, sqlc queries, and migration tests all in place
• Ready for Phase 11 (per-library scan pipeline) — libraries table and library_id queries available
• Ready for Phase 12 (library CRUD API) — all 7 library queries generated and tested
• Ready for Phase 13 (library views & phantom tracks) — phantom metadata queries with is_phantom column available

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Phase: 10-schema-migration Completed: 2026-03-09