feat(database): shape the library like files, and shrink the catalog

Plans 013 and 014, the album page that prompted them, and the smaller
fixes they turned up. Changelog, largest first.

## The local library is shaped like files, not like MusicBrainz

`audio_files` carries its own tags and points at `albums` and
`artists`; `file_genres` is the one real many-to-many. `recordings`,
`release_group_recordings`, `artist_credit`, `artist_credit_artist`,
`recording_genres`, `release_groups` and `release_to_rg` are gone from
the local side, and with them a six-way join in every read, a
`MIN(release_group_id)` subquery in eleven queries and a
first-credited-artist subquery in nine. Measured on a real 25,966-file
library, every many-to-many that model expressed was 1:1 in the data.

- Ownership is a file. `GetFilePathsByRecordingMBIDs`,
  `LibraryMBIDIndex.CheckMBIDs`, `collectLibraryEntities` and
  `pruneStaleLocalCrossReferences` all join `audio_files`, so the 812
  orphaned recordings, 216 release groups and 260 artists that library
  carried are now structurally impossible.
- One projection: every track query selects from the `track_metadata`
  view, one row type, one mapper. Nine hand-rolled copies had drifted
  far enough to report different years on different screens.
- `library_id = 0` means every library, so each list query exists once
  instead of scoped and unscoped with a branch at every call site.
- No migration chain. `sql/schemas/` is the one description of the
  shape; `sql/migrations/`, `applyMigrations` and `schema_migrations`
  are squashed away, along with the drift between them that had sqlc
  generating against a stale schema.
- `database.InsertTestTrack` is the one test seeder; twenty test files
  had been assembling the old FK chain each in its own order.

## The catalog stores its ids as bytes

`explore_index`'s three 36-char MBID columns and its entity-type text
are 16 raw bytes and a small integer. The table and its six indexes go
780 MB to 405 MB on a real 2,052,200-row catalog, which is why a fresh
install is ~0.6 GB rather than ~1.0 GB.

- `backend/explore/mbid.go` is the only place the encoding is known;
  everything above it speaks dashed strings.
- `CHECK(length(mbid) = 16)` makes a stringly write fail at the insert
  rather than silently returning no rows, since SQLite does not coerce
  between TEXT and BLOB.
- The importer asks the artifact what encoding it carries and converts
  on the way in, so the artifact already published keeps working and no
  format bump is needed.
- `indexRowColumns`/`scanIndexRow` replace four copies of a 22-column
  list, and `TestStoredEncodingRoundTrips` sweeps every read path.

## An album page that says how much of the album is yours

- One question, asked once: is there a file. `filePaths` is filled by a
  single batched lookup when the tracklist settles, and the badge, the
  Play count, the dimmed rows and every menu item read it — replacing
  four claims of decreasing confidence that could show a green tick on
  an album whose every action did nothing.
- Play, Play 7 of 12, or no play button at all.
- `total_tracks` on `explore_index` (~2 bytes over 400,677 release
  groups) and on `audio_files` from tags that have always carried it:
  a complete MBID-matched album now makes no catalog call at all, where
  it used to spend the most expensive request the app makes.
- A merged cluster shows the running order the most releases agree on,
  and the version list marks the release you own rather than standing a
  synthetic entry in for it.
- `AlbumReleasesFailed`: a slow fetch is no longer reported as a failed
  one by a 12-second timer.
- Rows not in the library are dimmed in place (with `aria-disabled`)
  instead of the owned ones wearing a green tick and a legend.

## Caches and cover art get ceilings

- Only the three tiers of a cover are stored; the full-resolution copy
  nothing rendered was 1,134 MB of a 1.4 GB covers directory.
- One artist portrait is downloaded and the rest are remembered as
  URLs — 4.1 GB of a 5.3 GB cache was candidates no code path reads.
- `browsedArtBudget` and `httpCacheBudget` bound what an age cannot:
  the same install held art for 5,770 artists in a 1,301-artist
  library.
- `OrphanedArtistImagesJob` joined a bare MBID onto a sharded
  directory, so it deleted the rows that were the only record of the
  files it left behind. `explore.ArtistImageDir` is that layout's one
  definition now.

## The autotag queue asks whether there is work

`tagging_items` was a row per album folder, not a queue, and no query
read the `tag_status` column that held the answer. The four queue
queries ask the files, which matters most where it is least visible:
`startPrefetch` was scoring every album in a tagged library against
MusicBrainz.

## Phantom playlist tracks resolve in place

An M3U8 imported before its files leaves phantom rows; they now match
by path and fall back to position, keep their place in the playlist
when resolved, and pair best-first so two phantoms cannot claim the
same file.

## Playing a track plays the list it is in

Double-click, and Play on a single row's menu, queue the list as
displayed with `startIndex` on that row — the album page and the track
list used to queue one track and discard the album around it. A
multi-row selection still plays exactly itself.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AfVYUVExXsx1nSWrXN8mAh

backend/autotag/apply.go

@@ -328,43 +328,42 @@ func (a *Applier) Apply(
 func (a *Applier) syncDBMBIDs(
 	ctx context.Context, tr TrackApply, cand Candidate,
 ) error {
-	// Look up recording row via audio_file.
-	af, err := a.q.GetAudioFile(ctx, tr.Local.AudioFileID)
-	if err != nil {
-		return fmt.Errorf("get audio_file: %w", err)
-	}
-
 	if tr.CandidateTrack.MBID != "" {
-		if err := a.q.SetRecordingMBID(ctx, sqlcgen.SetRecordingMBIDParams{
-			Mbid: sql.NullString{String: tr.CandidateTrack.MBID, Valid: true},
-			ID:   af.RecordingID,
+		if err := a.q.SetFileRecordingMBID(ctx, sqlcgen.SetFileRecordingMBIDParams{
+			RecordingMbid: sql.NullString{String: tr.CandidateTrack.MBID, Valid: true},
+			ID:            tr.Local.AudioFileID,
 		}); err != nil {
 			return fmt.Errorf("set recording mbid: %w", err)
 		}
 	}
 
-	if cand.ReleaseGroupMBID != "" {
-		rgID, err := a.q.GetRecordingReleaseGroupID(ctx, af.RecordingID)
-		if err == nil && rgID > 0 {
-			if err := a.q.SetReleaseGroupMBID(ctx, sqlcgen.SetReleaseGroupMBIDParams{
-				Mbid: sql.NullString{String: cand.ReleaseGroupMBID, Valid: true},
-				ID:   rgID,
-			}); err != nil {
-				return fmt.Errorf("set release group mbid: %w", err)
-			}
+	if cand.ReleaseGroupMBID == "" {
+		return nil
+	}
 
-			// Stamp the release-group's original-release year too —
-			// this is what the tracklist / smart-playlist year rule
-			// surfaces by default once the user accepts a candidate.
-			if year := parseYear(cand.OriginalDate); year > 0 {
-				if err := a.q.SetReleaseGroupOriginalYear(
-					ctx, sqlcgen.SetReleaseGroupOriginalYearParams{
-						OriginalYear: sql.NullInt64{Int64: int64(year), Valid: true},
-						ID:           rgID,
-					},
-				); err != nil {
-					return fmt.Errorf("set release group original year: %w", err)
-				}
+	// The album is reached through the file rather than through two
+	// join tables; SetFileAlbumMBID takes the file id and does the
+	// lookup in one statement.
+	if err := a.q.SetFileAlbumMBID(ctx, sqlcgen.SetFileAlbumMBIDParams{
+		Mbid: sql.NullString{String: cand.ReleaseGroupMBID, Valid: true},
+		ID:   tr.Local.AudioFileID,
+	}); err != nil {
+		return fmt.Errorf("set album mbid: %w", err)
+	}
+
+	// Stamp the album's original-release year too - this is what the
+	// tracklist and the smart-playlist year rule surface by default
+	// once the user accepts a candidate.
+	if year := parseYear(cand.OriginalDate); year > 0 {
+		af, err := a.q.GetAudioFile(ctx, tr.Local.AudioFileID)
+		if err == nil && af.AlbumID.Valid {
+			if err := a.q.SetAlbumOriginalYear(
+				ctx, sqlcgen.SetAlbumOriginalYearParams{
+					OriginalYear: sql.NullInt64{Int64: int64(year), Valid: true},
+					ID:           af.AlbumID.Int64,
+				},
+			); err != nil {
+				return fmt.Errorf("set album original year: %w", err)
 			}
 		}
 	}

backend/autotag/apply_test.go

@@ -2,7 +2,6 @@ package autotag_test
 
 import (
 	"context"
-	"database/sql"
 	"log/slog"
 	"sync"
 	"testing"
@@ -87,51 +86,22 @@ func seedAudioFiles(
 	q := db.Queries
 	ctx := db.Ctx
 
-	ac, err := q.UpsertArtistCredit(ctx, "Test Artist")
-	if err != nil {
-		t.Fatalf("upsert artist credit: %v", err)
-	}
-
-	rg, err := q.UpsertReleaseGroup(ctx, sqlcgen.UpsertReleaseGroupParams{
-		Name:                "Test Album",
-		AlbumArtistCreditID: sql.NullInt64{Int64: ac.ID, Valid: true},
-	})
-	if err != nil {
-		t.Fatalf("upsert rg: %v", err)
-	}
-
 	out := make([]sqlcgen.AudioFile, 0, len(paths))
 
 	for i, p := range paths {
-		rec, err := q.CreateRecordingFull(ctx, sqlcgen.CreateRecordingFullParams{
-			Name:           p,
-			ArtistCreditID: ac.ID,
-			TrackNumber:    sql.NullInt64{Int64: int64(i + 1), Valid: true},
+		id := database.InsertTestTrack(t, db, database.TestTrack{
+			FilePath:    p,
+			Title:       p,
+			Artist:      "Test Artist",
+			Album:       "Test Album",
+			TrackNumber: int64(i + 1),
+			LengthMs:    100000,
+			GroupKey:    groupKey,
 		})
-		if err != nil {
-			t.Fatalf("create recording: %v", err)
-		}
 
-		if _, err := q.CreateReleaseGroupRecording(ctx, sqlcgen.CreateReleaseGroupRecordingParams{
-			ReleaseGroupID: rg.ID,
-			RecordingID:    rec.ID,
-			TrackNumber:    sql.NullInt64{Int64: int64(i + 1), Valid: true},
-		}); err != nil {
-			t.Fatalf("link rg recording: %v", err)
-		}
-
-		af, err := q.CreateAudioFileWithGroupKey(ctx, sqlcgen.CreateAudioFileWithGroupKeyParams{
-			FilePath:           p,
-			LengthMilliseconds: 100000,
-			FileTypeID:         0,
-			RecordingID:        rec.ID,
-			Basename:           p,
-			LibraryID:          0,
-			GroupKey:           groupKey,
-			TagStatus:          "untagged",
-		})
+		af, err := q.GetAudioFile(ctx, id)
 		if err != nil {
-			t.Fatalf("create audio file: %v", err)
+			t.Fatalf("read seeded audio file: %v", err)
 		}
 
 		out = append(out, af)

backend/autotag/local.go

@@ -56,7 +56,7 @@ func (r *LocalResolver) LocalTracksForGroup(
 }
 
 // ResolveLocal returns candidate releases sourced from the local
-// DB's release_groups rows (filtered to those carrying an MBID)
+// DB's albums (filtered to those carrying an MBID)
 // whose normalized name matches the tagging item's album name.
 // No network calls.  Candidates carry all tracks flat; caller runs
 // AlignTracks on each to produce per-track alignments.
@@ -67,7 +67,7 @@ func (r *LocalResolver) ResolveLocal(
 		return nil, nil
 	}
 
-	rows, err := r.q.ListLocalReleaseGroupCandidates(ctx, albumName)
+	rows, err := r.q.ListLocalAlbumCandidates(ctx, albumName)
 	if err != nil {
 		return nil, fmt.Errorf("list local candidates: %w", err)
 	}
@@ -84,12 +84,12 @@ func (r *LocalResolver) ResolveLocal(
 			continue
 		}
 
-		if _, ok := byID[row.ReleaseGroupID]; !ok {
-			byID[row.ReleaseGroupID] = localCandidate(row)
+		if _, ok := byID[row.AlbumID]; !ok {
+			byID[row.AlbumID] = localCandidate(row)
 		}
 
-		tracksByID[row.ReleaseGroupID] = append(
-			tracksByID[row.ReleaseGroupID],
+		tracksByID[row.AlbumID] = append(
+			tracksByID[row.AlbumID],
 			CandidateTrack{
 				Position:     int(row.TrackNumber),
 				DiscNumber:   int(row.DiscNumber),
@@ -113,15 +113,15 @@ func (r *LocalResolver) ResolveLocal(
 // localCandidate converts one sqlc row (minus track-level fields)
 // into a Candidate shell.  Track fields and alignments are filled
 // in by the caller.
-func localCandidate(row sqlcgen.ListLocalReleaseGroupCandidatesRow) *Candidate {
+func localCandidate(row sqlcgen.ListLocalAlbumCandidatesRow) *Candidate {
 	date := ""
 	if row.Year > 0 {
 		date = fmt.Sprintf("%04d", row.Year)
 	}
 
 	mbid := ""
-	if row.ReleaseGroupMbid.Valid {
-		mbid = row.ReleaseGroupMbid.String
+	if row.AlbumMbid.Valid {
+		mbid = row.AlbumMbid.String
 	}
 
 	return &Candidate{

backend/autotag/scorer_test.go

@@ -2,13 +2,11 @@ package autotag_test
 
 import (
 	"context"
-	"database/sql"
 	"log/slog"
 	"testing"
 
 	"yellowjacket/backend/autotag"
 	"yellowjacket/backend/database"
-	"yellowjacket/backend/database/sql/sqlcgen"
 )
 
 // seedAlbum drops a minimal release_group + recordings + audio_files
@@ -33,70 +31,19 @@ type seededTrack struct {
 func seed(t *testing.T, db *database.DB, album seededAlbum) {
 	t.Helper()
 
-	ctx := db.Ctx
-	q := db.Queries
-
-	ac, err := q.UpsertArtistCredit(ctx, "Test Artist")
-	if err != nil {
-		t.Fatalf("upsert ac: %v", err)
-	}
-
-	rg, err := q.UpsertReleaseGroup(ctx, sqlcgen.UpsertReleaseGroupParams{
-		Name:                album.albumName,
-		AlbumArtistCreditID: sql.NullInt64{Int64: ac.ID, Valid: true},
-	})
-	if err != nil {
-		t.Fatalf("upsert rg: %v", err)
-	}
-
-	if album.releaseMBID != "" {
-		if _, err := db.ExecContext(
-			`UPDATE release_groups SET mbid = ? WHERE id = ?`,
-			album.releaseMBID, rg.ID,
-		); err != nil {
-			t.Fatalf("set rg mbid: %v", err)
-		}
-	}
-
 	for _, tr := range album.tracks {
-		rec, err := q.CreateRecordingFull(ctx, sqlcgen.CreateRecordingFullParams{
-			Name:           tr.title,
-			ArtistCreditID: ac.ID,
-			TrackNumber:    sql.NullInt64{Int64: int64(tr.trackNumber), Valid: true},
+		database.InsertTestTrack(t, db, database.TestTrack{
+			FilePath:      tr.filePath,
+			Title:         tr.title,
+			Artist:        "Test Artist",
+			Album:         album.albumName,
+			AlbumMBID:     album.releaseMBID,
+			RecordingMBID: tr.recordingMBID,
+			TrackNumber:   int64(tr.trackNumber),
+			LengthMs:      tr.lengthMillis,
+			LibraryID:     album.libraryID,
+			GroupKey:      album.groupKey,
 		})
-		if err != nil {
-			t.Fatalf("create recording: %v", err)
-		}
-
-		if tr.recordingMBID != "" {
-			if _, err := db.ExecContext(
-				`UPDATE recordings SET mbid = ? WHERE id = ?`,
-				tr.recordingMBID, rec.ID,
-			); err != nil {
-				t.Fatalf("set recording mbid: %v", err)
-			}
-		}
-
-		if _, err := q.CreateReleaseGroupRecording(ctx, sqlcgen.CreateReleaseGroupRecordingParams{
-			ReleaseGroupID: rg.ID,
-			RecordingID:    rec.ID,
-			TrackNumber:    sql.NullInt64{Int64: int64(tr.trackNumber), Valid: true},
-		}); err != nil {
-			t.Fatalf("link rg recording: %v", err)
-		}
-
-		if _, err := q.CreateAudioFileWithGroupKey(ctx, sqlcgen.CreateAudioFileWithGroupKeyParams{
-			FilePath:           tr.filePath,
-			LengthMilliseconds: tr.lengthMillis,
-			FileTypeID:         0,
-			RecordingID:        rec.ID,
-			Basename:           tr.filePath,
-			LibraryID:          album.libraryID,
-			GroupKey:           album.groupKey,
-			TagStatus:          "untagged",
-		}); err != nil {
-			t.Fatalf("create audio file: %v", err)
-		}
 	}
 
 	if _, err := db.ExecContext(`