improved library scan speeds, added library manager component

-libraries tab now opens a library manager
-choose library directory, manually soft scan and rescan
-batched db queues
-mp3 header-based duration extraction

backend/app.go

@@ -100,6 +100,7 @@ func NewYellowJacketApp(
 
 	yjApp.FEBindings = []any{
 		yjApp.FrontendUtil,
+		yjApp.appConfig,
 		yjApp.library,
 		yjApp.playlist,
 	}
@@ -141,6 +142,10 @@ func (yj *YellowJacketApp) OnStartup(ctx context.Context) {
 	yj.queue.SetPlayer(yj.player)
 	yj.queue.RestoreState()
 
+	// Give the library a reference to the queue so FullRescan can
+	// clear the queue and stop playback before wiping data.
+	yj.library.SetQueue(yj.queue)
+
 	// Register playback finished handler to drive queue auto-advance.
 	yj.player.SetPlaybackFinishedHandler(yj.queue.OnPlaybackFinished)
 

backend/config/config.go

@@ -11,7 +11,9 @@ import (
 	"path"
 
 	"github.com/BurntSushi/toml"
+	"github.com/wailsapp/wails/v2/pkg/runtime"
 
+	"yellowjacket/backend/events"
 	"yellowjacket/backend/library"
 	"yellowjacket/backend/system"
 )
@@ -148,3 +150,49 @@ func (c *Config) applyDefaults() {
 func (c *Config) SetContext(ctx context.Context) {
 	c.ctx = ctx
 }
+
+// GetLibraryDirectory returns the currently configured library directory path.
+func (c *Config) GetLibraryDirectory() string {
+	if c.Library == nil {
+		return ""
+	}
+
+	return string(c.Library.DirectoryPath)
+}
+
+// SetLibraryDirectory validates and saves a new library directory,
+// then emits the LibraryConfigChanged event so listeners (e.g. the
+// Library scanner) can react.
+func (c *Config) SetLibraryDirectory(dir string) error {
+	newLibConf, err := library.NewConfig(dir)
+	if err != nil {
+		return fmt.Errorf(
+			"invalid library directory: %w", err,
+		)
+	}
+
+	c.Library = newLibConf
+
+	if err := c.Save(); err != nil {
+		return fmt.Errorf(
+			"could not save config after directory change: %w", err,
+		)
+	}
+
+	if c.ctx != nil {
+		runtime.EventsEmit(
+			c.ctx,
+			events.LibraryConfigChanged,
+			map[string]any{
+				"DirectoryPath": dir,
+			},
+		)
+	}
+
+	c.logger.Info(
+		"library directory updated",
+		"directory", dir,
+	)
+
+	return nil
+}

backend/database/sql/queries/artist_credit.sql

@@ -23,3 +23,6 @@ WHERE id = ?;
 -- name: DeleteArtistCredit :exec
 DELETE FROM artist_credit 
 WHERE id = ?;
+
+-- name: DeleteAllArtistCredits :exec
+DELETE FROM artist_credit;

backend/database/sql/queries/artist_credit_artists.sql

@@ -15,3 +15,6 @@ WHERE id =?;
 DELETE FROM artist_credit_artist 
 WHERE id =?;
 
+-- name: DeleteAllArtistCreditArtists :exec
+DELETE FROM artist_credit_artist;
+

backend/database/sql/queries/artists.sql

@@ -24,6 +24,9 @@ WHERE id = ?;
 DELETE FROM artists 
 WHERE id = ?;
 
+-- name: DeleteAllArtists :exec
+DELETE FROM artists;
+
 -- name: GetAllArtists :many
 SELECT * FROM artists
 ORDER BY name;

backend/database/sql/queries/audio_files.sql

@@ -71,6 +71,9 @@ LEFT JOIN cover_art ca ON rg.cover_art_id = ca.id
 WHERE af.file_path = ?
 LIMIT 1;
 
+-- name: DeleteAllAudioFiles :exec
+DELETE FROM audio_files;
+
 -- name: GetAudioFilesByReleaseGroup :many
 SELECT
     af.file_path,

backend/database/sql/queries/cover_art.sql

@@ -26,3 +26,6 @@ WHERE id = ?;
 -- name: DeleteCoverArt :exec
 DELETE FROM cover_art 
 WHERE id = ?;
+
+-- name: DeleteAllCoverArt :exec
+DELETE FROM cover_art;

backend/database/sql/queries/playlists.sql

@@ -82,6 +82,9 @@ LEFT JOIN release_groups rg ON rgr.release_group_id = rg.id
 LEFT JOIN cover_art ca ON rg.cover_art_id = ca.id
 ORDER BY pt.playlist_id, pt.position;
 
+-- name: DeleteAllPlaylistTracks :exec
+DELETE FROM playlist_tracks;
+
 -- name: GetNextPlaylistTrackPosition :one
 SELECT COALESCE(MAX(position), -1) + 1 AS next_position
 FROM playlist_tracks WHERE playlist_id = ?;

backend/database/sql/queries/recordings.sql

@@ -28,6 +28,9 @@ WHERE id = ?;
 DELETE FROM recordings 
 WHERE id = ?;
 
+-- name: DeleteAllRecordings :exec
+DELETE FROM recordings;
+
 -- name: GetAllRecordings :many
 SELECT * FROM recordings
 ORDER BY name;

backend/database/sql/queries/release_group_recordings.sql

@@ -23,3 +23,6 @@ WHERE id = ?;
 -- name: DeleteReleaseGroupRecordingByFK :exec
 DELETE FROM release_group_recordings
 WHERE release_group_id = ? AND recording_id = ?;
+
+-- name: DeleteAllReleaseGroupRecordings :exec
+DELETE FROM release_group_recordings;

backend/database/sql/queries/release_groups.sql

@@ -38,6 +38,9 @@ WHERE id = ?;
 DELETE FROM release_groups 
 WHERE id = ?;
 
+-- name: DeleteAllReleaseGroups :exec
+DELETE FROM release_groups;
+
 -- name: GetAllReleaseGroups :many
 SELECT * FROM release_groups
 ORDER BY name;

backend/database/sql/sqlcgen/artist_credit.sql.go

@@ -21,6 +21,15 @@ func (q *Queries) CreateArtistCredit(ctx context.Context, text string) (ArtistCr
 	return i, err
 }
 
+const deleteAllArtistCredits = `-- name: DeleteAllArtistCredits :exec
+DELETE FROM artist_credit
+`
+
+func (q *Queries) DeleteAllArtistCredits(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllArtistCredits)
+	return err
+}
+
 const deleteArtistCredit = `-- name: DeleteArtistCredit :exec
 DELETE FROM artist_credit 
 WHERE id = ?

backend/database/sql/sqlcgen/artist_credit_artists.sql.go

@@ -26,6 +26,15 @@ func (q *Queries) CreateArtistCreditArtist(ctx context.Context, arg CreateArtist
 	return i, err
 }
 
+const deleteAllArtistCreditArtists = `-- name: DeleteAllArtistCreditArtists :exec
+DELETE FROM artist_credit_artist
+`
+
+func (q *Queries) DeleteAllArtistCreditArtists(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllArtistCreditArtists)
+	return err
+}
+
 const deleteArtistCreditArtist = `-- name: DeleteArtistCreditArtist :exec
 DELETE FROM artist_credit_artist 
 WHERE id =?

backend/database/sql/sqlcgen/artists.sql.go

@@ -21,6 +21,15 @@ func (q *Queries) CreateArtist(ctx context.Context, name string) (Artist, error)
 	return i, err
 }
 
+const deleteAllArtists = `-- name: DeleteAllArtists :exec
+DELETE FROM artists
+`
+
+func (q *Queries) DeleteAllArtists(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllArtists)
+	return err
+}
+
 const deleteArtist = `-- name: DeleteArtist :exec
 DELETE FROM artists 
 WHERE id = ?

backend/database/sql/sqlcgen/audio_files.sql.go

@@ -51,6 +51,15 @@ func (q *Queries) CreateAudioFile(ctx context.Context, arg CreateAudioFileParams
 	return i, err
 }
 
+const deleteAllAudioFiles = `-- name: DeleteAllAudioFiles :exec
+DELETE FROM audio_files
+`
+
+func (q *Queries) DeleteAllAudioFiles(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllAudioFiles)
+	return err
+}
+
 const deleteAudioFile = `-- name: DeleteAudioFile :exec
 DELETE FROM audio_files 
 WHERE id = ?

backend/database/sql/sqlcgen/cover_art.sql.go

@@ -32,6 +32,15 @@ func (q *Queries) CreateCoverArt(ctx context.Context, arg CreateCoverArtParams)
 	return i, err
 }
 
+const deleteAllCoverArt = `-- name: DeleteAllCoverArt :exec
+DELETE FROM cover_art
+`
+
+func (q *Queries) DeleteAllCoverArt(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllCoverArt)
+	return err
+}
+
 const deleteCoverArt = `-- name: DeleteCoverArt :exec
 DELETE FROM cover_art 
 WHERE id = ?

backend/database/sql/sqlcgen/playlists.sql.go

@@ -58,6 +58,15 @@ func (q *Queries) CreatePlaylist(ctx context.Context, name string) (Playlist, er
 	return i, err
 }
 
+const deleteAllPlaylistTracks = `-- name: DeleteAllPlaylistTracks :exec
+DELETE FROM playlist_tracks
+`
+
+func (q *Queries) DeleteAllPlaylistTracks(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllPlaylistTracks)
+	return err
+}
+
 const deletePlaylist = `-- name: DeletePlaylist :exec
 DELETE FROM playlists WHERE id = ?
 `

backend/database/sql/sqlcgen/recordings.sql.go

@@ -86,6 +86,15 @@ func (q *Queries) CreateRecordingFull(ctx context.Context, arg CreateRecordingFu
 	return i, err
 }
 
+const deleteAllRecordings = `-- name: DeleteAllRecordings :exec
+DELETE FROM recordings
+`
+
+func (q *Queries) DeleteAllRecordings(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllRecordings)
+	return err
+}
+
 const deleteRecording = `-- name: DeleteRecording :exec
 DELETE FROM recordings 
 WHERE id = ?

backend/database/sql/sqlcgen/release_group_recordings.sql.go

@@ -41,6 +41,15 @@ func (q *Queries) CreateReleaseGroupRecording(ctx context.Context, arg CreateRel
 	return i, err
 }
 
+const deleteAllReleaseGroupRecordings = `-- name: DeleteAllReleaseGroupRecordings :exec
+DELETE FROM release_group_recordings
+`
+
+func (q *Queries) DeleteAllReleaseGroupRecordings(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllReleaseGroupRecordings)
+	return err
+}
+
 const deleteReleaseGroupRecording = `-- name: DeleteReleaseGroupRecording :exec
 DELETE FROM release_group_recordings 
 WHERE id = ?

backend/database/sql/sqlcgen/release_groups.sql.go

@@ -68,6 +68,15 @@ func (q *Queries) CreateReleaseGroupFull(ctx context.Context, arg CreateReleaseG
 	return i, err
 }
 
+const deleteAllReleaseGroups = `-- name: DeleteAllReleaseGroups :exec
+DELETE FROM release_groups
+`
+
+func (q *Queries) DeleteAllReleaseGroups(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllReleaseGroups)
+	return err
+}
+
 const deleteReleaseGroup = `-- name: DeleteReleaseGroup :exec
 DELETE FROM release_groups 
 WHERE id = ?

backend/events/events.go

@@ -56,5 +56,6 @@ const (
 
 // Library events.
 const (
+	LibraryScanStarted  = "LibraryScanStarted"
 	LibraryScanComplete = "LibraryScanComplete"
 )

backend/library/library.go

@@ -26,12 +26,55 @@ import (
 
 var errLibraryDirNotConfigured = errors.New("library directory not configured")
 
+// scanBatchSize controls how many files are committed in a single
+// database transaction during a scan.  Larger batches amortize
+// SQLite's fsync cost but increase the blast radius of a failed commit.
+const scanBatchSize = 50
+
+// entityCache holds recently resolved database entities so that
+// repeated upserts for the same artist/album/cover art within a scan
+// can be served from memory instead of hitting the database.
+// It is only accessed from the single DB-writer goroutine and
+// therefore needs no synchronisation.
+type entityCache struct {
+	artistCredits map[string]sqlcgen.ArtistCredit
+	artists       map[string]sqlcgen.Artist
+	releaseGroups map[string]sqlcgen.ReleaseGroup
+	coverArt      map[string]sqlcgen.CoverArt
+	// linkedCredits tracks artist-credit-artist links already created
+	// so we skip the duplicate INSERT.  Key is "artistID:creditID".
+	linkedCredits map[string]struct{}
+}
+
+func newEntityCache() *entityCache {
+	return &entityCache{
+		artistCredits: make(map[string]sqlcgen.ArtistCredit),
+		artists:       make(map[string]sqlcgen.Artist),
+		releaseGroups: make(map[string]sqlcgen.ReleaseGroup),
+		coverArt:      make(map[string]sqlcgen.CoverArt),
+		linkedCredits: make(map[string]struct{}),
+	}
+}
+
+// queueClearer is a narrow interface for clearing the playback queue.
+type queueClearer interface {
+	Clear()
+}
+
 // Library manages scanning and querying the music collection.
 type Library struct {
 	ctx    context.Context
 	logger *slog.Logger
 	conf   *Config
 	db     *database.DB
+	queue  queueClearer
+}
+
+// SetQueue provides the library with a reference to the queue so
+// that destructive operations like FullRescan can clear the queue
+// and stop playback before wiping data.
+func (l *Library) SetQueue(q queueClearer) {
+	l.queue = q
 }
 
 // NewLibrary creates a new library with the given configuration.
@@ -107,7 +150,11 @@ func (l *Library) registerEventHandlers() {
 // Scan syncs the library by adding new files and removing deleted ones.
 // Files that exist but have incomplete metadata (recording_id = 0) will be updated.
 func (l *Library) Scan() error {
-	l.logger.Info("beginning library scan", "workers", scanWorkerCount)
+	l.logger.Info(
+		"beginning library scan", "workers", scanWorkerCount,
+	)
+
+	runtime.EventsEmit(l.ctx, events.LibraryScanStarted)
 
 	if len(l.conf.DirectoryPath) == 0 {
 		return errLibraryDirNotConfigured
@@ -224,7 +271,9 @@ func (l *Library) Scan() error {
 		}
 	}()
 
-	// DB writer goroutine: serialize all database writes to avoid SQLite contention
+	// DB writer goroutine: serialize all database writes to avoid SQLite
+	// contention.  Results are committed in batches to amortize the cost
+	// of SQLite's fsync-per-commit.
 	var dbWg sync.WaitGroup
 
 	dbWg.Add(1)
@@ -232,35 +281,35 @@ func (l *Library) Scan() error {
 	go func() {
 		defer dbWg.Done()
 
-		for result := range resultChan {
-			var saveErr error
+		cache := newEntityCache()
 
-			if result.needsUpdate {
-				saveErr = l.updateAudioFileMetadata(result)
-				if saveErr == nil {
-					updated.Add(1)
-				}
-			} else {
-				saveErr = l.saveAudioFile(result)
-				if saveErr == nil {
-					added.Add(1)
-				}
+		var batch []importResult
+
+		flushBatch := func() {
+			if len(batch) == 0 {
+				return
 			}
 
-			if saveErr != nil {
-				l.logger.Warn(
-					"failed to save audio file",
-					"path",
-					result.absolutePath,
-					"err",
-					saveErr,
-				)
-
+			if batchErr := l.commitBatch(
+				batch, cache, &added, &updated,
+			); batchErr != nil {
 				errMu.Lock()
-				scanErr = errors.Join(scanErr, saveErr)
+				scanErr = errors.Join(scanErr, batchErr)
 				errMu.Unlock()
 			}
+
+			batch = batch[:0]
 		}
+
+		for result := range resultChan {
+			batch = append(batch, result)
+			if len(batch) >= scanBatchSize {
+				flushBatch()
+			}
+		}
+
+		// Flush any remaining results.
+		flushBatch()
 	}()
 
 	// Worker pool: extract metadata concurrently, send results to DB writer
@@ -368,6 +417,7 @@ type importResult struct {
 }
 
 // extractAudioMetadata reads and extracts metadata from an audio file.
+// It opens the file once, extracting both tags and duration in a single pass.
 func (l *Library) extractAudioMetadata(work scanWork) (importResult, error) {
 	result := importResult{
 		absolutePath:   work.absolutePath,
@@ -376,236 +426,241 @@ func (l *Library) extractAudioMetadata(work scanWork) (importResult, error) {
 		needsUpdate:    work.needsUpdate,
 	}
 
-	// Get duration (skip if updating and we already have it)
-	if work.needsUpdate && work.existingLength > 0 {
-		result.lengthMillis = work.existingLength
-	} else {
-		trackLengthMillis, err := metadata.GetTrackLengthMillis(work.absolutePath)
-		if err != nil {
-			return result, fmt.Errorf(
-				"could not get track length for %s: %w",
-				work.absolutePath,
-				err,
-			)
-		}
+	// Skip duration decode if we already have it from a previous import.
+	skipDuration := work.needsUpdate && work.existingLength > 0
 
-		result.lengthMillis = trackLengthMillis
-	}
-
-	// Extract tags
-	tags, err := metadata.ExtractTags(work.absolutePath)
+	tags, lengthMillis, err := metadata.ExtractAllMetadata(
+		work.absolutePath, skipDuration,
+	)
 	if err != nil {
-		l.logger.Warn("could not extract tags", "path", work.absolutePath, "err", err)
-		// Continue with empty tags - not a fatal error
-		tags = &metadata.TrackMetadata{}
+		return result, fmt.Errorf(
+			"could not extract metadata for %s: %w",
+			work.absolutePath,
+			err,
+		)
 	}
 
 	result.tags = tags
 
+	if skipDuration {
+		result.lengthMillis = work.existingLength
+	} else {
+		result.lengthMillis = lengthMillis
+	}
+
 	return result, nil
 }
 
+// commitBatch wraps a slice of import results in a single database
+// transaction, creating all related records and audio file entries.
+// Individual file failures are logged and accumulated but do not
+// abort the entire batch.
+func (l *Library) commitBatch(
+	batch []importResult,
+	cache *entityCache,
+	added, updated *atomic.Int64,
+) error {
+	tx, err := l.db.BeginTx()
+	if err != nil {
+		return fmt.Errorf("could not begin transaction: %w", err)
+	}
+
+	txq := l.db.Queries.WithTx(tx)
+
+	var batchErr error
+
+	for i := range batch {
+		result := &batch[i]
+
+		var saveErr error
+
+		if result.needsUpdate {
+			saveErr = l.updateAudioFileMetadata(txq, cache, *result)
+			if saveErr == nil {
+				updated.Add(1)
+			}
+		} else {
+			saveErr = l.saveAudioFile(txq, cache, *result)
+			if saveErr == nil {
+				added.Add(1)
+			}
+		}
+
+		if saveErr != nil {
+			l.logger.Warn(
+				"failed to save audio file",
+				"path", result.absolutePath,
+				"err", saveErr,
+			)
+
+			batchErr = errors.Join(batchErr, saveErr)
+		}
+	}
+
+	if commitErr := tx.Commit(); commitErr != nil {
+		return fmt.Errorf(
+			"could not commit batch of %d files: %w",
+			len(batch), commitErr,
+		)
+	}
+
+	return batchErr
+}
+
 // saveAudioFile writes audio file metadata to the database (new files).
-func (l *Library) saveAudioFile(result importResult) error {
+func (l *Library) saveAudioFile(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	result importResult,
+) error {
 	l.logger.Debug(
 		"saving audio file to db",
 		"absolute-path", result.absolutePath,
 		"track-length-millis", result.lengthMillis,
-		"file-type", int64(slices.Index(metadata.SupportedFileExtensions, result.fileType)),
+		"file-type", int64(
+			slices.Index(
+				metadata.SupportedFileExtensions,
+				result.fileType,
+			),
+		),
 	)
 
-	// Process metadata and create related records
-	recordingID, err := l.processMetadata(result)
+	// Process metadata and create related records.
+	recordingID, err := l.processMetadata(q, cache, result)
 	if err != nil {
 		return fmt.Errorf("could not process metadata: %w", err)
 	}
 
-	if _, err := l.db.Queries.CreateAudioFile(
+	if _, err := q.CreateAudioFile(
 		l.ctx, sqlcgen.CreateAudioFileParams{
 			FilePath:           result.absolutePath,
 			LengthMilliseconds: result.lengthMillis,
 			FileTypeID: int64(
-				slices.Index(metadata.SupportedFileExtensions, result.fileType),
+				slices.Index(
+					metadata.SupportedFileExtensions,
+					result.fileType,
+				),
 			),
 			RecordingID: recordingID,
 		}); err != nil {
-		return fmt.Errorf("could not save audio file to db: %w", err)
+		return fmt.Errorf(
+			"could not save audio file to db: %w", err,
+		)
 	}
 
-	l.logger.Debug("added audio file to library", "path", result.absolutePath)
+	l.logger.Debug(
+		"added audio file to library",
+		"path", result.absolutePath,
+	)
 
 	return nil
 }
 
 // updateAudioFileMetadata updates an existing audio file with extracted metadata.
-func (l *Library) updateAudioFileMetadata(result importResult) error {
+func (l *Library) updateAudioFileMetadata(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	result importResult,
+) error {
 	l.logger.Debug(
 		"updating audio file metadata",
 		"absolute-path", result.absolutePath,
 		"file-id", result.existingFileID,
 	)
 
-	// Process metadata and create related records
-	recordingID, err := l.processMetadata(result)
+	// Process metadata and create related records.
+	recordingID, err := l.processMetadata(q, cache, result)
 	if err != nil {
 		return fmt.Errorf("could not process metadata: %w", err)
 	}
 
-	if err := l.db.Queries.UpdateAudioFileRecording(
+	if err := q.UpdateAudioFileRecording(
 		l.ctx, sqlcgen.UpdateAudioFileRecordingParams{
 			RecordingID: recordingID,
 			ID:          result.existingFileID,
 		}); err != nil {
-		return fmt.Errorf("could not update audio file recording: %w", err)
+		return fmt.Errorf(
+			"could not update audio file recording: %w", err,
+		)
 	}
 
-	l.logger.Debug("updated audio file metadata", "path", result.absolutePath)
+	l.logger.Debug(
+		"updated audio file metadata",
+		"path", result.absolutePath,
+	)
 
 	return nil
 }
 
-// processMetadata creates all related database records for metadata and returns the recording ID.
-func (l *Library) processMetadata(result importResult) (int64, error) {
+// processMetadata creates all related database records for metadata
+// and returns the recording ID.  It uses the provided queries object
+// (which may be transaction-scoped) and the entity cache to avoid
+// redundant upserts for repeated artist/album/cover-art values.
+func (l *Library) processMetadata(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	result importResult,
+) (int64, error) {
 	tags := result.tags
 	if tags == nil {
 		tags = &metadata.TrackMetadata{}
 	}
 
-	// 1. Handle cover art (if present)
-	var coverArtID sql.NullInt64
+	// 1. Handle cover art (if present).
+	coverArtID := l.processCoverArt(q, cache, tags)
 
-	if tags.Picture != nil {
-		coverPath, err := l.saveCoverArt(tags.Picture)
-		if err != nil {
-			l.logger.Warn("could not save cover art", "err", err)
-		} else if coverPath != "" {
-			// Use upsert to avoid duplicates
-			ca, err := l.db.Queries.UpsertCoverArt(l.ctx, sqlcgen.UpsertCoverArtParams{
-				IsEmbedded: true,
-				FilePath:   coverPath,
-				MimeType:   tags.Picture.MIMEType,
-			})
-			if err != nil {
-				l.logger.Warn("could not create cover art record", "err", err)
-			} else {
-				coverArtID = sql.NullInt64{Int64: ca.ID, Valid: true}
-			}
-		}
-	}
-
-	// 2. Get or create artist credit for track artist
+	// 2. Get or create artist credit for track artist.
 	artistName := tags.Artist
 	if artistName == "" {
 		artistName = "Unknown Artist"
 	}
 
-	artistCredit, err := l.db.Queries.UpsertArtistCredit(l.ctx, artistName)
+	artistCredit, err := l.cachedUpsertArtistCredit(
+		q, cache, artistName,
+	)
 	if err != nil {
-		return 0, fmt.Errorf("could not upsert artist credit: %w", err)
+		return 0, fmt.Errorf(
+			"could not upsert artist credit: %w", err,
+		)
 	}
 
-	// Also create the artist record and link (best effort)
-	artist, err := l.db.Queries.UpsertArtist(l.ctx, artistName)
-	if err != nil {
-		l.logger.Warn("could not upsert artist", "err", err)
-	} else {
-		// Link artist to credit (ignore error if already linked)
-		_, _ = l.db.Queries.CreateArtistCreditArtist(l.ctx, sqlcgen.CreateArtistCreditArtistParams{
-			ArtistID: artist.ID,
-			CreditID: artistCredit.ID,
-		})
-	}
+	l.cachedLinkArtist(q, cache, artistName, artistCredit.ID)
 
 	// 3. Get or create artist credit for album artist.
-	// Always assign an album artist credit so the cover grid displays an
-	// artist name.  When the AlbumArtist tag is absent or identical to the
-	// track Artist, reuse the track artist credit instead of leaving it NULL.
-	var albumArtistCreditID sql.NullInt64
+	albumArtistCreditID := l.resolveAlbumArtistCredit(
+		q, cache, tags, artistCredit.ID,
+	)
 
-	if tags.AlbumArtist != "" && tags.AlbumArtist != tags.Artist {
-		albumArtistCredit, err := l.db.Queries.UpsertArtistCredit(
-			l.ctx, tags.AlbumArtist,
-		)
-		if err != nil {
-			l.logger.Warn("could not upsert album artist credit", "err", err)
-		} else {
-			albumArtistCreditID = sql.NullInt64{
-				Int64: albumArtistCredit.ID, Valid: true,
-			}
+	// 4. Get or create release group (album).
+	releaseGroupID := l.resolveReleaseGroup(
+		q, cache, tags, albumArtistCreditID, coverArtID,
+	)
 
-			// Also create the artist record and link.
-			albumArtist, err := l.db.Queries.UpsertArtist(
-				l.ctx, tags.AlbumArtist,
-			)
-			if err != nil {
-				l.logger.Warn("could not upsert album artist", "err", err)
-			} else {
-				_, _ = l.db.Queries.CreateArtistCreditArtist(
-					l.ctx,
-					sqlcgen.CreateArtistCreditArtistParams{
-						ArtistID: albumArtist.ID,
-						CreditID: albumArtistCredit.ID,
-					},
-				)
-			}
-		}
-	} else {
-		// AlbumArtist is empty or matches the track artist — reuse the
-		// track artist credit so the release group always has an artist.
-		albumArtistCreditID = sql.NullInt64{
-			Int64: artistCredit.ID, Valid: true,
-		}
-	}
-
-	// 4. Get or create release group (album)
-	var releaseGroupID sql.NullInt64
-
-	if tags.Album != "" {
-		rg, err := l.db.Queries.UpsertReleaseGroup(l.ctx, sqlcgen.UpsertReleaseGroupParams{
-			Name:                tags.Album,
-			AlbumArtistCreditID: albumArtistCreditID,
-			Year:                toNullInt64(tags.Year),
-		})
-		if err != nil {
-			l.logger.Warn("could not upsert release group", "err", err)
-		} else {
-			releaseGroupID = sql.NullInt64{Int64: rg.ID, Valid: true}
-
-			// Update cover art if this album doesn't have one yet
-			if coverArtID.Valid && !rg.CoverArtID.Valid {
-				err := l.db.Queries.UpdateReleaseGroupCoverArt(
-					l.ctx,
-					sqlcgen.UpdateReleaseGroupCoverArtParams{
-						CoverArtID: coverArtID,
-						ID:         rg.ID,
-					},
-				)
-				if err != nil {
-					l.logger.Warn("could not update release group cover art", "err", err)
-				}
-			}
-		}
-	}
-
-	// 5. Create recording
-	recording, err := l.db.Queries.CreateRecordingFull(l.ctx, sqlcgen.CreateRecordingFullParams{
-		Name:           l.getRecordingName(tags, result.absolutePath),
-		ArtistCreditID: artistCredit.ID,
-		TrackNumber:    toNullInt64(tags.TrackNumber),
-		DiscNumber:     toNullInt64(tags.DiscNumber),
-		Year:           toNullInt64(tags.Year),
-		Genre:          toNullString(tags.Genre),
-		Composer:       toNullString(tags.Composer),
-		Lyrics:         toNullString(tags.Lyrics),
-		Comment:        toNullString(tags.Comment),
-	})
+	// 5. Create recording.
+	recording, err := q.CreateRecordingFull(
+		l.ctx, sqlcgen.CreateRecordingFullParams{
+			Name: l.getRecordingName(
+				tags, result.absolutePath,
+			),
+			ArtistCreditID: artistCredit.ID,
+			TrackNumber:    toNullInt64(tags.TrackNumber),
+			DiscNumber:     toNullInt64(tags.DiscNumber),
+			Year:           toNullInt64(tags.Year),
+			Genre:          toNullString(tags.Genre),
+			Composer:       toNullString(tags.Composer),
+			Lyrics:         toNullString(tags.Lyrics),
+			Comment:        toNullString(tags.Comment),
+		},
+	)
 	if err != nil {
-		return 0, fmt.Errorf("could not create recording: %w", err)
+		return 0, fmt.Errorf(
+			"could not create recording: %w", err,
+		)
 	}
 
-	// 6. Link recording to release group
+	// 6. Link recording to release group.
 	if releaseGroupID.Valid {
-		_, err = l.db.Queries.CreateReleaseGroupRecording(
+		_, err = q.CreateReleaseGroupRecording(
 			l.ctx,
 			sqlcgen.CreateReleaseGroupRecordingParams{
 				ReleaseGroupID: releaseGroupID.Int64,
@@ -615,13 +670,235 @@ func (l *Library) processMetadata(result importResult) (int64, error) {
 			},
 		)
 		if err != nil {
-			l.logger.Warn("could not link recording to release group", "err", err)
+			l.logger.Warn(
+				"could not link recording to release group",
+				"err", err,
+			)
 		}
 	}
 
 	return recording.ID, nil
 }
 
+// processCoverArt saves cover art to disk and upserts the DB record,
+// using the cache to skip work for previously seen images.
+func (l *Library) processCoverArt(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	tags *metadata.TrackMetadata,
+) sql.NullInt64 {
+	if tags.Picture == nil {
+		return sql.NullInt64{}
+	}
+
+	coverPath, err := l.saveCoverArt(tags.Picture)
+	if err != nil {
+		l.logger.Warn("could not save cover art", "err", err)
+
+		return sql.NullInt64{}
+	}
+
+	if coverPath == "" {
+		return sql.NullInt64{}
+	}
+
+	// Check cache first.
+	if cached, ok := cache.coverArt[coverPath]; ok {
+		return sql.NullInt64{Int64: cached.ID, Valid: true}
+	}
+
+	ca, err := q.UpsertCoverArt(l.ctx, sqlcgen.UpsertCoverArtParams{
+		IsEmbedded: true,
+		FilePath:   coverPath,
+		MimeType:   tags.Picture.MIMEType,
+	})
+	if err != nil {
+		l.logger.Warn(
+			"could not create cover art record", "err", err,
+		)
+
+		return sql.NullInt64{}
+	}
+
+	cache.coverArt[coverPath] = ca
+
+	return sql.NullInt64{Int64: ca.ID, Valid: true}
+}
+
+// cachedUpsertArtistCredit returns the artist credit for the given
+// name, using the cache when possible.
+func (l *Library) cachedUpsertArtistCredit(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	name string,
+) (sqlcgen.ArtistCredit, error) {
+	if cached, ok := cache.artistCredits[name]; ok {
+		return cached, nil
+	}
+
+	ac, err := q.UpsertArtistCredit(l.ctx, name)
+	if err != nil {
+		return sqlcgen.ArtistCredit{}, err
+	}
+
+	cache.artistCredits[name] = ac
+
+	return ac, nil
+}
+
+// cachedLinkArtist upserts the artist record and creates the
+// artist-credit-artist link, skipping work already done.
+func (l *Library) cachedLinkArtist(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	name string,
+	creditID int64,
+) {
+	artist, ok := cache.artists[name]
+	if !ok {
+		var err error
+
+		artist, err = q.UpsertArtist(l.ctx, name)
+		if err != nil {
+			l.logger.Warn(
+				"could not upsert artist", "err", err,
+			)
+
+			return
+		}
+
+		cache.artists[name] = artist
+	}
+
+	linkKey := fmt.Sprintf("%d:%d", artist.ID, creditID)
+	if _, done := cache.linkedCredits[linkKey]; done {
+		return
+	}
+
+	_, _ = q.CreateArtistCreditArtist(
+		l.ctx,
+		sqlcgen.CreateArtistCreditArtistParams{
+			ArtistID: artist.ID,
+			CreditID: creditID,
+		},
+	)
+
+	cache.linkedCredits[linkKey] = struct{}{}
+}
+
+// resolveAlbumArtistCredit returns the album artist credit ID.
+// When the AlbumArtist tag is absent or matches the track artist,
+// the track artist credit is reused.
+func (l *Library) resolveAlbumArtistCredit(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	tags *metadata.TrackMetadata,
+	trackArtistCreditID int64,
+) sql.NullInt64 {
+	if tags.AlbumArtist == "" || tags.AlbumArtist == tags.Artist {
+		return sql.NullInt64{
+			Int64: trackArtistCreditID, Valid: true,
+		}
+	}
+
+	albumArtistCredit, err := l.cachedUpsertArtistCredit(
+		q, cache, tags.AlbumArtist,
+	)
+	if err != nil {
+		l.logger.Warn(
+			"could not upsert album artist credit", "err", err,
+		)
+
+		return sql.NullInt64{}
+	}
+
+	l.cachedLinkArtist(
+		q, cache, tags.AlbumArtist, albumArtistCredit.ID,
+	)
+
+	return sql.NullInt64{
+		Int64: albumArtistCredit.ID, Valid: true,
+	}
+}
+
+// resolveReleaseGroup returns the release group ID for the album,
+// using the cache when possible.
+func (l *Library) resolveReleaseGroup(
+	q *sqlcgen.Queries,
+	cache *entityCache,
+	tags *metadata.TrackMetadata,
+	albumArtistCreditID sql.NullInt64,
+	coverArtID sql.NullInt64,
+) sql.NullInt64 {
+	if tags.Album == "" {
+		return sql.NullInt64{}
+	}
+
+	// Check cache first.
+	if cached, ok := cache.releaseGroups[tags.Album]; ok {
+		// If the cached release group lacks cover art and we now
+		// have it, update it.
+		if coverArtID.Valid && !cached.CoverArtID.Valid {
+			err := q.UpdateReleaseGroupCoverArt(
+				l.ctx,
+				sqlcgen.UpdateReleaseGroupCoverArtParams{
+					CoverArtID: coverArtID,
+					ID:         cached.ID,
+				},
+			)
+			if err != nil {
+				l.logger.Warn(
+					"could not update release group cover art",
+					"err", err,
+				)
+			} else {
+				cached.CoverArtID = coverArtID
+				cache.releaseGroups[tags.Album] = cached
+			}
+		}
+
+		return sql.NullInt64{Int64: cached.ID, Valid: true}
+	}
+
+	rg, err := q.UpsertReleaseGroup(
+		l.ctx, sqlcgen.UpsertReleaseGroupParams{
+			Name:                tags.Album,
+			AlbumArtistCreditID: albumArtistCreditID,
+			Year:                toNullInt64(tags.Year),
+		},
+	)
+	if err != nil {
+		l.logger.Warn(
+			"could not upsert release group", "err", err,
+		)
+
+		return sql.NullInt64{}
+	}
+
+	// Update cover art if this album doesn't have one yet.
+	if coverArtID.Valid && !rg.CoverArtID.Valid {
+		err := q.UpdateReleaseGroupCoverArt(
+			l.ctx,
+			sqlcgen.UpdateReleaseGroupCoverArtParams{
+				CoverArtID: coverArtID,
+				ID:         rg.ID,
+			},
+		)
+		if err != nil {
+			l.logger.Warn(
+				"could not update release group cover art",
+				"err", err,
+			)
+		} else {
+			rg.CoverArtID = coverArtID
+		}
+	}
+
+	cache.releaseGroups[tags.Album] = rg
+
+	return sql.NullInt64{Int64: rg.ID, Valid: true}
+}
+
 // getRecordingName returns the track title, or falls back to the filename.
 func (l *Library) getRecordingName(tags *metadata.TrackMetadata, filePath string) string {
 	if tags.Title != "" {

backend/library/rescan.go

@@ -0,0 +1,185 @@
+package library
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/wailsapp/wails/v2/pkg/runtime"
+
+	"yellowjacket/backend/events"
+	"yellowjacket/backend/system"
+)
+
+// FullRescan clears the queue and player, wipes all library data
+// (database records and cover art files), and performs a fresh
+// scan from scratch.
+func (l *Library) FullRescan() error {
+	l.logger.Info("beginning full library rescan")
+
+	runtime.EventsEmit(l.ctx, events.LibraryScanStarted)
+
+	// Stop playback and clear the queue before wiping data so
+	// the player is not referencing now-deleted tracks.
+	if l.queue != nil {
+		l.queue.Clear()
+	}
+
+	if err := l.clearLibraryData(); err != nil {
+		return fmt.Errorf("could not clear library data: %w", err)
+	}
+
+	return l.Scan()
+}
+
+// clearLibraryData removes all library-related records from the
+// database and deletes all cover art files from disk.  The deletes
+// are executed in FK-safe order within a single transaction.
+func (l *Library) clearLibraryData() error {
+	l.logger.Info("clearing all library data")
+
+	if err := l.clearLibraryTables(); err != nil {
+		return err
+	}
+
+	if err := l.clearCoverArtFiles(); err != nil {
+		return err
+	}
+
+	l.logger.Info("library data cleared successfully")
+
+	return nil
+}
+
+// clearLibraryTables deletes all library-related rows in FK-safe
+// order within a single transaction.
+func (l *Library) clearLibraryTables() error {
+	tx, err := l.db.BeginTx()
+	if err != nil {
+		return fmt.Errorf("could not begin transaction: %w", err)
+	}
+
+	defer func() {
+		_ = tx.Rollback()
+	}()
+
+	txq := l.db.Queries.WithTx(tx)
+
+	// Phase 1: leaf tables (nothing references these).
+	if err := txq.ClearQueueTracks(l.ctx); err != nil {
+		return fmt.Errorf("could not clear queue tracks: %w", err)
+	}
+
+	if err := txq.DeleteAllPlaylistTracks(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear playlist tracks: %w", err,
+		)
+	}
+
+	if err := txq.DeleteAllReleaseGroupRecordings(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear release group recordings: %w", err,
+		)
+	}
+
+	if err := txq.DeleteAllArtistCreditArtists(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear artist credit artists: %w", err,
+		)
+	}
+
+	// Phase 2: mid-level tables.
+	if err := txq.DeleteAllAudioFiles(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear audio files: %w", err,
+		)
+	}
+
+	if err := txq.DeleteAllReleaseGroups(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear release groups: %w", err,
+		)
+	}
+
+	if err := txq.DeleteAllRecordings(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear recordings: %w", err,
+		)
+	}
+
+	// Phase 3: root tables.
+	if err := txq.DeleteAllCoverArt(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear cover art: %w", err,
+		)
+	}
+
+	if err := txq.DeleteAllArtistCredits(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear artist credits: %w", err,
+		)
+	}
+
+	if err := txq.DeleteAllArtists(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear artists: %w", err,
+		)
+	}
+
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf(
+			"could not commit library clear transaction: %w", err,
+		)
+	}
+
+	l.logger.Info("all library tables cleared")
+
+	return nil
+}
+
+// clearCoverArtFiles removes all files from the covers directory.
+func (l *Library) clearCoverArtFiles() error {
+	dataDir, err := system.GetUserDataDirPath()
+	if err != nil {
+		return fmt.Errorf(
+			"could not get user data directory: %w", err,
+		)
+	}
+
+	coverDir := filepath.Join(dataDir, "covers")
+
+	entries, err := os.ReadDir(coverDir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+
+		return fmt.Errorf(
+			"could not read covers directory: %w", err,
+		)
+	}
+
+	var removed int
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+
+		path := filepath.Join(coverDir, entry.Name())
+		if err := os.Remove(path); err != nil {
+			l.logger.Warn(
+				"could not remove cover art file",
+				"path", path, "err", err,
+			)
+
+			continue
+		}
+
+		removed++
+	}
+
+	l.logger.Info("cover art files removed", "count", removed)
+
+	return nil
+}

backend/metadata/duration.go

@@ -0,0 +1,36 @@
+package metadata
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// getTrackDuration returns the duration of an audio file in
+// milliseconds.  For MP3 files it uses a fast header-only parser
+// (Xing/VBRI/CBR); for other formats it falls back to a full
+// decode via beep which is already O(1) for FLAC, OGG, and WAV.
+//
+// The file position is undefined after this call.
+func getTrackDuration(f *os.File) (int64, error) {
+	ext := filepath.Ext(f.Name())
+
+	if ext == ".mp3" {
+		return getMP3Duration(f)
+	}
+
+	// FLAC, OGG, and WAV: beep's Decode() + Len() is already
+	// cheap (reads headers/metadata only, no full audio decode).
+	streamer, format, err := DecodeFile(f)
+	if err != nil {
+		return 0, fmt.Errorf("error decoding file: %w", err)
+	}
+
+	lengthMillis := int64(
+		float64(streamer.Len()*1000) /
+			float64(format.SampleRate),
+	)
+	_ = streamer.Close()
+
+	return lengthMillis, nil
+}

backend/metadata/metadata.go

@@ -2,6 +2,7 @@ package metadata
 
 import (
 	"fmt"
+	"io"
 	"os"
 )
 
@@ -50,3 +51,48 @@ func GetTrackLengthMillis(path string) (int64, error) {
 
 	return lengthMillis, nil
 }
+
+// ExtractAllMetadata opens the file once and extracts both tags and duration.
+// This avoids the overhead of opening the file twice when both are needed.
+// If skipDuration is true, only tags are extracted and lengthMillis is 0.
+func ExtractAllMetadata(
+	path string,
+	skipDuration bool,
+) (*TrackMetadata, int64, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, 0, fmt.Errorf(
+			"could not open file: %w", err,
+		)
+	}
+
+	defer func() { _ = f.Close() }()
+
+	// Extract tags first (reads only headers, fast).
+	tags, err := ExtractTagsFromReader(f)
+	if err != nil {
+		return nil, 0, fmt.Errorf(
+			"could not extract tags from %s: %w", path, err,
+		)
+	}
+
+	if skipDuration {
+		return tags, 0, nil
+	}
+
+	// Seek back to the beginning for duration extraction.
+	if _, err := f.Seek(0, io.SeekStart); err != nil {
+		return tags, 0, fmt.Errorf(
+			"could not seek file for duration: %w", err,
+		)
+	}
+
+	lengthMillis, err := getTrackDuration(f)
+	if err != nil {
+		return tags, 0, fmt.Errorf(
+			"error getting duration for %s: %w", path, err,
+		)
+	}
+
+	return tags, lengthMillis, nil
+}

backend/metadata/mp3duration.go

@@ -0,0 +1,329 @@
+package metadata
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+)
+
+// errNoSyncWord is returned when no valid MP3 frame sync word
+// is found within the search window.
+var errNoSyncWord = errors.New("could not find MP3 sync word")
+
+// maxSyncSearchBytes limits how far we scan for the first sync word
+// after skipping any ID3v2 tag.
+const maxSyncSearchBytes = 64 * 1024
+
+// MPEG version constants.
+const (
+	mpegVersion1   = 3 // 0b11
+	mpegVersion2   = 2 // 0b10
+	mpegVersion2_5 = 0 // 0b00  (unofficial extension)
+)
+
+// bitrateTable maps [versionIndex][bitrateIndex] to kbps.
+// versionIndex 0 = MPEG1, 1 = MPEG2/2.5.
+// bitrateIndex 0 and 15 are invalid.
+//
+//nolint:mnd // lookup table values are from the MPEG spec.
+var bitrateTable = [2][16]int{
+	// MPEG1 Layer 3
+	{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0},
+	// MPEG2/2.5 Layer 3
+	{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0},
+}
+
+// sampleRateTable maps [versionIndex][sampleRateIndex] to Hz.
+// versionIndex: 0 = MPEG1, 1 = MPEG2, 2 = MPEG2.5.
+//
+//nolint:mnd // lookup table values are from the MPEG spec.
+var sampleRateTable = [3][4]int{
+	{44100, 48000, 32000, 0}, // MPEG1
+	{22050, 24000, 16000, 0}, // MPEG2
+	{11025, 12000, 8000, 0},  // MPEG2.5
+}
+
+// samplesPerFrame returns the number of PCM samples per MP3 frame
+// for the given MPEG version (Layer 3 only).
+//
+//nolint:mnd // constants from the MPEG spec.
+func samplesPerFrame(version int) int {
+	if version == mpegVersion1 {
+		return 1152
+	}
+
+	return 576 // MPEG2 / MPEG2.5
+}
+
+// getMP3Duration computes the duration of an MP3 file in
+// milliseconds by reading only the first frame's header and any
+// Xing/VBRI VBR header it contains.  For CBR files (no VBR header)
+// it falls back to fileSize / bitrate.
+//
+// The file position is undefined after this call.
+func getMP3Duration(f *os.File) (int64, error) {
+	// 1. Skip a leading ID3v2 tag if present.
+	audioStart, err := skipID3v2(f)
+	if err != nil {
+		return 0, fmt.Errorf("skipping ID3v2: %w", err)
+	}
+
+	// 2. Find and parse the first MP3 frame header.
+	hdr, frameOffset, err := findFrameHeader(f, audioStart)
+	if err != nil {
+		return 0, err
+	}
+
+	// 3. Attempt to read a VBR header (Xing/Info or VBRI) from
+	//    inside the first frame.
+	vbrFrames, found, err := readVBRHeader(f, hdr, frameOffset)
+	if err != nil {
+		return 0, err
+	}
+
+	if found && vbrFrames > 0 {
+		spf := samplesPerFrame(hdr.version)
+		durationMS := int64(vbrFrames) *
+			int64(spf) * 1000 / int64(hdr.sampleRate)
+
+		return durationMS, nil
+	}
+
+	// 4. CBR fallback: duration = audioBytes * 8 / bitrate.
+	fi, err := f.Stat()
+	if err != nil {
+		return 0, fmt.Errorf("stat file for CBR duration: %w", err)
+	}
+
+	audioBytes := fi.Size() - audioStart
+	durationMS := audioBytes * 8 * 1000 /
+		(int64(hdr.bitrateKbps) * 1000)
+
+	return durationMS, nil
+}
+
+// mpegFrameHeader holds the parsed fields of a 4-byte MPEG audio
+// frame header.
+type mpegFrameHeader struct {
+	version     int // mpegVersion1, mpegVersion2, mpegVersion2_5
+	bitrateKbps int
+	sampleRate  int
+	channelMode int // 0-3; 3 = mono
+	padding     int // 0 or 1
+}
+
+// skipID3v2 checks for an ID3v2 tag at the start of f and returns
+// the byte offset where audio data begins.
+//
+//nolint:mnd // byte offsets from the ID3v2 spec.
+func skipID3v2(f *os.File) (int64, error) {
+	var buf [10]byte
+
+	if _, err := f.ReadAt(buf[:], 0); err != nil {
+		return 0, fmt.Errorf("reading ID3v2 header: %w", err)
+	}
+
+	if string(buf[:3]) != "ID3" {
+		return 0, nil // no ID3v2 tag
+	}
+
+	// Syncsafe integer: 4 bytes, each using 7 bits.
+	size := int64(buf[6])<<21 |
+		int64(buf[7])<<14 |
+		int64(buf[8])<<7 |
+		int64(buf[9])
+
+	return 10 + size, nil
+}
+
+// findFrameHeader scans from startOffset for the first valid MP3
+// sync word and returns the parsed header plus the file offset
+// where the frame begins.
+//
+//nolint:mnd,cyclop // bit manipulation from the MPEG spec.
+func findFrameHeader(
+	f *os.File,
+	startOffset int64,
+) (mpegFrameHeader, int64, error) {
+	if _, err := f.Seek(startOffset, io.SeekStart); err != nil {
+		return mpegFrameHeader{}, 0, fmt.Errorf(
+			"seeking to audio start: %w", err,
+		)
+	}
+
+	// Read a chunk large enough to contain the first frame.
+	buf := make([]byte, maxSyncSearchBytes)
+
+	n, err := io.ReadAtLeast(f, buf, 4)
+	if err != nil {
+		return mpegFrameHeader{}, 0, fmt.Errorf(
+			"reading audio data: %w", err,
+		)
+	}
+
+	buf = buf[:n]
+
+	for i := 0; i <= len(buf)-4; i++ {
+		// Sync word: 11 set bits (0xFF followed by 0xE0 mask).
+		if buf[i] != 0xFF || buf[i+1]&0xE0 != 0xE0 {
+			continue
+		}
+
+		hdr, ok := parseFrameHeader(buf[i : i+4])
+		if !ok {
+			continue
+		}
+
+		return hdr, startOffset + int64(i), nil
+	}
+
+	return mpegFrameHeader{}, 0, errNoSyncWord
+}
+
+// parseFrameHeader decodes a 4-byte MPEG audio frame header.
+// Returns false if the header contains invalid field combinations.
+//
+//nolint:mnd,cyclop // bit manipulation from the MPEG spec.
+func parseFrameHeader(b []byte) (mpegFrameHeader, bool) {
+	version := int((b[1] >> 3) & 0x03)
+	layer := int((b[1] >> 1) & 0x03)
+
+	// We only handle Layer 3.
+	if layer != 1 { // Layer encoding: 1 = Layer 3
+		return mpegFrameHeader{}, false
+	}
+
+	// Determine version index for the bitrate table.
+	var bitrateIdx int
+
+	switch version {
+	case mpegVersion1:
+		bitrateIdx = 0
+	case mpegVersion2, mpegVersion2_5:
+		bitrateIdx = 1
+	default:
+		return mpegFrameHeader{}, false // reserved
+	}
+
+	brIndex := int((b[2] >> 4) & 0x0F)
+	bitrate := bitrateTable[bitrateIdx][brIndex]
+
+	if bitrate == 0 {
+		return mpegFrameHeader{}, false
+	}
+
+	// Sample rate.
+	var srVersionIdx int
+
+	switch version {
+	case mpegVersion1:
+		srVersionIdx = 0
+	case mpegVersion2:
+		srVersionIdx = 1
+	case mpegVersion2_5:
+		srVersionIdx = 2
+	}
+
+	srIndex := int((b[2] >> 2) & 0x03)
+	sampleRate := sampleRateTable[srVersionIdx][srIndex]
+
+	if sampleRate == 0 {
+		return mpegFrameHeader{}, false
+	}
+
+	padding := int((b[2] >> 1) & 0x01)
+	channelMode := int((b[3] >> 6) & 0x03)
+
+	return mpegFrameHeader{
+		version:     version,
+		bitrateKbps: bitrate,
+		sampleRate:  sampleRate,
+		channelMode: channelMode,
+		padding:     padding,
+	}, true
+}
+
+// readVBRHeader tries to read a Xing/Info or VBRI header from the
+// first frame at frameOffset.  Returns the total frame count and
+// whether a VBR header was found.
+//
+//nolint:mnd // byte offsets from Xing/VBRI specs.
+func readVBRHeader(
+	f *os.File,
+	hdr mpegFrameHeader,
+	frameOffset int64,
+) (uint32, bool, error) {
+	// Xing/Info header offset depends on version and channel mode.
+	var sideInfoSize int
+
+	switch {
+	case hdr.version == mpegVersion1 && hdr.channelMode != 3:
+		sideInfoSize = 32
+	case hdr.version == mpegVersion1 && hdr.channelMode == 3:
+		sideInfoSize = 17
+	case hdr.channelMode != 3:
+		sideInfoSize = 17
+	default:
+		sideInfoSize = 9
+	}
+
+	// The Xing header sits right after the 4-byte frame header +
+	// side information.
+	xingOffset := frameOffset + 4 + int64(sideInfoSize)
+
+	// Read enough bytes for Xing header (magic + flags + frames).
+	var xingBuf [12]byte
+
+	if _, err := f.ReadAt(xingBuf[:], xingOffset); err != nil {
+		if errors.Is(err, io.EOF) {
+			return 0, false, nil
+		}
+
+		return 0, false, fmt.Errorf(
+			"reading Xing header: %w", err,
+		)
+	}
+
+	magic := string(xingBuf[:4])
+	if magic == "Xing" || magic == "Info" {
+		flags := binary.BigEndian.Uint32(xingBuf[4:8])
+
+		// Bit 0 of flags indicates the frames field is present.
+		if flags&0x01 != 0 {
+			frames := binary.BigEndian.Uint32(xingBuf[8:12])
+
+			return frames, true, nil
+		}
+
+		// Xing header present but no frame count — fall through
+		// to CBR fallback.
+		return 0, true, nil
+	}
+
+	// VBRI header is always at a fixed offset of 36 bytes from
+	// the frame start (regardless of version/channel mode).
+	vbriOffset := frameOffset + 36
+
+	var vbriBuf [26]byte
+
+	if _, err := f.ReadAt(vbriBuf[:], vbriOffset); err != nil {
+		if errors.Is(err, io.EOF) {
+			return 0, false, nil
+		}
+
+		return 0, false, fmt.Errorf(
+			"reading VBRI header: %w", err,
+		)
+	}
+
+	if string(vbriBuf[:4]) == "VBRI" {
+		// Total frames at offset 14 from VBRI magic.
+		frames := binary.BigEndian.Uint32(vbriBuf[14:18])
+
+		return frames, true, nil
+	}
+
+	return 0, false, nil
+}

backend/metadata/mp3duration_test.go

@@ -0,0 +1,117 @@
+package metadata
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// testMP3Files returns the paths to all .mp3 files in the test_data
+// directory.  It skips the test if none are found.
+func testMP3Files(t *testing.T) []string {
+	t.Helper()
+
+	root := filepath.Join("..", "..", "test_data")
+
+	var files []string
+
+	err := filepath.Walk(root, func(
+		path string, info os.FileInfo, err error,
+	) error {
+		if err != nil {
+			return err
+		}
+
+		if !info.IsDir() && filepath.Ext(path) == ".mp3" {
+			files = append(files, path)
+		}
+
+		return nil
+	})
+	if err != nil {
+		t.Fatalf("walking test_data: %v", err)
+	}
+
+	if len(files) == 0 {
+		t.Skip("no .mp3 test fixtures found in test_data/")
+	}
+
+	return files
+}
+
+// TestGetMP3Duration_MatchesBeepDecode verifies that the fast
+// header-only parser produces a duration within 1 second of the
+// full decode via beep, for every test MP3 file.
+func TestGetMP3Duration_MatchesBeepDecode(t *testing.T) {
+	for _, path := range testMP3Files(t) {
+		t.Run(filepath.Base(path), func(t *testing.T) {
+			// Reference value: full beep decode.
+			refMS, err := GetTrackLengthMillis(path)
+			if err != nil {
+				t.Fatalf(
+					"beep decode failed: %v", err,
+				)
+			}
+
+			// Fast path.
+			f, err := os.Open(path)
+			if err != nil {
+				t.Fatalf("open: %v", err)
+			}
+
+			defer func() { _ = f.Close() }()
+
+			fastMS, err := getMP3Duration(f)
+			if err != nil {
+				t.Fatalf(
+					"getMP3Duration failed: %v", err,
+				)
+			}
+
+			diffMS := refMS - fastMS
+			if diffMS < 0 {
+				diffMS = -diffMS
+			}
+
+			// Allow up to 1 second of difference to account
+			// for rounding and the slight inaccuracy of the
+			// CBR fallback for VBR-without-Xing files.
+			const toleranceMS = 1000
+
+			t.Logf(
+				"beep=%dms  fast=%dms  diff=%dms",
+				refMS, fastMS, diffMS,
+			)
+
+			if diffMS > toleranceMS {
+				t.Errorf(
+					"duration mismatch: beep=%dms fast=%dms "+
+						"(diff %dms exceeds %dms tolerance)",
+					refMS, fastMS, diffMS, toleranceMS,
+				)
+			}
+		})
+	}
+}
+
+// TestGetMP3Duration_BasicParsing exercises the parser on a single
+// file and verifies a positive duration is returned.
+func TestGetMP3Duration_BasicParsing(t *testing.T) {
+	files := testMP3Files(t)
+
+	f, err := os.Open(files[0])
+	if err != nil {
+		t.Fatalf("open: %v", err)
+	}
+
+	defer func() { _ = f.Close() }()
+
+	ms, err := getMP3Duration(f)
+	if err != nil {
+		t.Fatalf("getMP3Duration: %v", err)
+	}
+
+	if ms <= 0 {
+		t.Errorf("expected positive duration, got %d", ms)
+	}
+}

backend/queue/queue.go

@@ -1185,6 +1185,29 @@ func (q *Queue) GetState() State {
 	}
 }
 
+// Clear removes all tracks from the queue, stops playback, and
+// resets the queue state.  It persists the cleared state and
+// notifies the frontend.
+func (q *Queue) Clear() {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+
+	q.logger.Info("Clearing queue")
+
+	q.tracks = nil
+	q.currentIndex = -1
+	q.shuffleOrder = nil
+	q.sourcePlaylistID = 0
+
+	if q.player != nil {
+		q.player.UnloadTrack()
+	}
+
+	q.persistTracks()
+	q.persistState()
+	q.emitQueueChanged()
+}
+
 // EmitCurrentState emits the current queue state to the frontend.
 // This is called after the frontend DOM is ready.
 func (q *Queue) EmitCurrentState() {

frontend/index.ts

@@ -5,6 +5,7 @@ import '@components/now-playing/now-playing.ts';
 import '@components/sidebar/app-sidebar.ts';
 import '@components/queue-panel/queue-panel.ts';
 import '@components/playlist-view/playlist-view.ts';
+import '@components/library-manager/library-manager.ts';
 import '@awesome.me/webawesome/dist/styles/themes/default.css';
 import '@awesome.me/webawesome/dist/components/icon/icon.js';
 import { setBasePath } from '@awesome.me/webawesome/dist/webawesome.js';
@@ -36,6 +37,9 @@ document.addEventListener('navigate', (e: Event) => {
         case 'playlists':
             mainContent.innerHTML = '<playlist-view></playlist-view>';
             break;
+        case 'libraries':
+            mainContent.innerHTML = '<library-manager></library-manager>';
+            break;
         default:
             mainContent.innerHTML = `<div style="padding: 1em; color: #b3b3b3;">
                 <p>Coming soon: ${view}</p>

frontend/src/components/library-manager/library-manager.ts

@@ -0,0 +1,329 @@
+import { LitElement, html, css } from 'lit';
+import { customElement, state } from 'lit/decorators.js';
+import { EventsOn, EventsOff } from '@runtime/runtime';
+import { Scan, FullRescan } from '@go/library/Library';
+import {
+    GetLibraryDirectory,
+    SetLibraryDirectory,
+} from '@go/config/Config';
+import { DirectoryPicker } from '@go/frontendutil/FrontendUtil';
+import { Events } from '../../events';
+
+@customElement('library-manager')
+export class LibraryManager extends LitElement {
+    @state() private libraryDirectory = '';
+    @state() private selectedDirectory = '';
+    @state() private scanning = false;
+    @state() private statusMessage = '';
+
+    static override styles = css`
+        :host {
+            display: block;
+            padding: 1.5em;
+            color: #e9ecef;
+            font-family: system-ui, -apple-system, sans-serif;
+            overflow-y: auto;
+        }
+
+        h2 {
+            margin: 0 0 1em 0;
+            font-size: 1.4em;
+            font-weight: 600;
+            color: #f8f9fa;
+        }
+
+        .section {
+            margin-bottom: 2em;
+            padding: 1.25em;
+            background: #2b3035;
+            border-radius: 8px;
+        }
+
+        .section-title {
+            margin: 0 0 0.75em 0;
+            font-size: 1em;
+            font-weight: 600;
+            color: #dee2e6;
+        }
+
+        .section-description {
+            margin: 0 0 1em 0;
+            font-size: 0.85em;
+            color: #868e96;
+            line-height: 1.4;
+        }
+
+        .directory-row {
+            display: flex;
+            align-items: center;
+            gap: 0.75em;
+            margin-bottom: 1em;
+        }
+
+        .directory-path {
+            flex: 1;
+            padding: 0.5em 0.75em;
+            background: #1a1d20;
+            border: 1px solid #495057;
+            border-radius: 4px;
+            color: #adb5bd;
+            font-size: 0.85em;
+            font-family: monospace;
+            overflow: hidden;
+            text-overflow: ellipsis;
+            white-space: nowrap;
+            min-height: 1.2em;
+        }
+
+        .directory-path.has-value {
+            color: #e9ecef;
+        }
+
+        button {
+            padding: 0.5em 1.25em;
+            border: none;
+            border-radius: 4px;
+            font-size: 0.85em;
+            font-weight: 500;
+            cursor: pointer;
+            transition: background-color 0.15s ease;
+            white-space: nowrap;
+        }
+
+        button:disabled {
+            opacity: 0.5;
+            cursor: not-allowed;
+        }
+
+        .btn-primary {
+            background: #4263eb;
+            color: white;
+        }
+
+        .btn-primary:hover:not(:disabled) {
+            background: #3b5bdb;
+        }
+
+        .btn-success {
+            background: #2f9e44;
+            color: white;
+        }
+
+        .btn-success:hover:not(:disabled) {
+            background: #2b8a3e;
+        }
+
+        .btn-warning {
+            background: #e8590c;
+            color: white;
+        }
+
+        .btn-warning:hover:not(:disabled) {
+            background: #d9480f;
+        }
+
+        .btn-danger {
+            background: #e03131;
+            color: white;
+        }
+
+        .btn-danger:hover:not(:disabled) {
+            background: #c92a2a;
+        }
+
+        .scan-actions {
+            display: flex;
+            gap: 0.75em;
+            flex-wrap: wrap;
+        }
+
+        .status-bar {
+            margin-top: 1.5em;
+            padding: 0.75em 1em;
+            background: #1a1d20;
+            border-radius: 4px;
+            font-size: 0.85em;
+            color: #868e96;
+            min-height: 1.2em;
+        }
+
+        .status-bar.active {
+            color: #ffd43b;
+        }
+    `;
+
+    override connectedCallback(): void {
+        super.connectedCallback();
+        this.loadCurrentDirectory();
+
+        EventsOn(
+            Events.LibraryScanStarted,
+            this.handleScanStarted,
+        );
+        EventsOn(
+            Events.LibraryScanComplete,
+            this.handleScanComplete,
+        );
+    }
+
+    override disconnectedCallback(): void {
+        super.disconnectedCallback();
+        EventsOff(Events.LibraryScanStarted);
+        EventsOff(Events.LibraryScanComplete);
+    }
+
+    private async loadCurrentDirectory(): Promise<void> {
+        try {
+            const dir = await GetLibraryDirectory();
+            this.libraryDirectory = dir;
+            this.selectedDirectory = dir;
+        } catch (err) {
+            console.error(
+                'Failed to load library directory:',
+                err,
+            );
+        }
+    }
+
+    private handleScanStarted = (): void => {
+        this.scanning = true;
+        this.statusMessage = 'Scanning...';
+    };
+
+    private handleScanComplete = (): void => {
+        this.scanning = false;
+        this.statusMessage = 'Scan complete.';
+    };
+
+    private handleSelectDirectory = async (): Promise<void> => {
+        try {
+            const dir = await DirectoryPicker();
+
+            if (dir) {
+                this.selectedDirectory = dir;
+            }
+        } catch (err) {
+            console.error('Directory picker failed:', err);
+        }
+    };
+
+    private handleSaveDirectory = async (): Promise<void> => {
+        if (!this.selectedDirectory) return;
+
+        try {
+            await SetLibraryDirectory(this.selectedDirectory);
+            this.libraryDirectory = this.selectedDirectory;
+            this.statusMessage =
+                'Library directory saved. A scan will start automatically if the directory changed.';
+        } catch (err) {
+            this.statusMessage = `Failed to save directory: ${err}`;
+            console.error('Failed to save directory:', err);
+        }
+    };
+
+    private handleSoftScan = async (): Promise<void> => {
+        try {
+            await Scan();
+        } catch (err) {
+            this.statusMessage = `Scan failed: ${err}`;
+            console.error('Soft scan failed:', err);
+        }
+    };
+
+    private handleFullRescan = async (): Promise<void> => {
+        const confirmed = confirm(
+            'This will delete ALL library data including cover art and re-scan from scratch. Continue?',
+        );
+
+        if (!confirmed) return;
+
+        try {
+            await FullRescan();
+        } catch (err) {
+            this.statusMessage = `Full rescan failed: ${err}`;
+            console.error('Full rescan failed:', err);
+        }
+    };
+
+    private get directoryChanged(): boolean {
+        return (
+            this.selectedDirectory !== this.libraryDirectory
+        );
+    }
+
+    override render() {
+        return html`
+            <h2>Library Manager</h2>
+
+            <div class="section">
+                <p class="section-title">
+                    Library Directory
+                </p>
+                <p class="section-description">
+                    Select the root directory containing your
+                    music files. Changing this will
+                    automatically trigger a scan.
+                </p>
+                <div class="directory-row">
+                    <div
+                        class="directory-path ${this.selectedDirectory ? 'has-value' : ''}"
+                    >
+                        ${this.selectedDirectory ||
+                        'No directory selected'}
+                    </div>
+                    <button
+                        class="btn-primary"
+                        @click=${this.handleSelectDirectory}
+                    >
+                        Browse
+                    </button>
+                    <button
+                        class="btn-success"
+                        ?disabled=${!this.directoryChanged ||
+                        this.scanning}
+                        @click=${this.handleSaveDirectory}
+                    >
+                        Save
+                    </button>
+                </div>
+            </div>
+
+            <div class="section">
+                <p class="section-title">Scan Actions</p>
+                <p class="section-description">
+                    Soft scan finds new files, skips existing
+                    ones, and removes orphaned entries. Full
+                    rescan clears the entire database and
+                    cover art cache, then re-imports
+                    everything.
+                </p>
+                <div class="scan-actions">
+                    <button
+                        class="btn-warning"
+                        ?disabled=${this.scanning}
+                        @click=${this.handleSoftScan}
+                    >
+                        ${this.scanning
+                            ? 'Scanning...'
+                            : 'Soft Scan'}
+                    </button>
+                    <button
+                        class="btn-danger"
+                        ?disabled=${this.scanning}
+                        @click=${this.handleFullRescan}
+                    >
+                        ${this.scanning
+                            ? 'Scanning...'
+                            : 'Full Rescan'}
+                    </button>
+                </div>
+            </div>
+
+            <div
+                class="status-bar ${this.scanning ? 'active' : ''}"
+            >
+                ${this.statusMessage || 'Ready.'}
+            </div>
+        `;
+    }
+}

frontend/src/events.ts

@@ -39,6 +39,7 @@ export const Events = {
     RequestRemoveTracksFromQueue: "RequestRemoveTracksFromQueue",
 
     // Library events
+    LibraryScanStarted: "LibraryScanStarted",
     LibraryScanComplete: "LibraryScanComplete",
 } as const;
 

frontend/wailsjs/go/config/Config.d.ts

@@ -0,0 +1,18 @@
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+import {http} from '../models';
+import {context} from '../models';
+
+export function GetLibraryDirectory():Promise<string>;
+
+export function Load():Promise<void>;
+
+export function Save():Promise<void>;
+
+export function ServeHTTP(arg1:http.ResponseWriter,arg2:http.Request):Promise<void>;
+
+export function SetContext(arg1:context.Context):Promise<void>;
+
+export function SetLibraryDirectory(arg1:string):Promise<void>;
+
+export function Validate():Promise<void>;

frontend/wailsjs/go/config/Config.js

@@ -0,0 +1,31 @@
+// @ts-check
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+
+export function GetLibraryDirectory() {
+  return window['go']['config']['Config']['GetLibraryDirectory']();
+}
+
+export function Load() {
+  return window['go']['config']['Config']['Load']();
+}
+
+export function Save() {
+  return window['go']['config']['Config']['Save']();
+}
+
+export function ServeHTTP(arg1, arg2) {
+  return window['go']['config']['Config']['ServeHTTP'](arg1, arg2);
+}
+
+export function SetContext(arg1) {
+  return window['go']['config']['Config']['SetContext'](arg1);
+}
+
+export function SetLibraryDirectory(arg1) {
+  return window['go']['config']['Config']['SetLibraryDirectory'](arg1);
+}
+
+export function Validate() {
+  return window['go']['config']['Config']['Validate']();
+}

frontend/wailsjs/go/library/Library.d.ts

@@ -3,6 +3,8 @@
 import {library} from '../models';
 import {context} from '../models';
 
+export function FullRescan():Promise<void>;
+
 export function GetAlbumTracks(arg1:number):Promise<Array<library.Track>>;
 
 export function GetAllAlbums():Promise<Array<library.Album>>;
@@ -12,3 +14,5 @@ export function GetAllTracks():Promise<Array<library.Track>>;
 export function Scan():Promise<void>;
 
 export function SetContext(arg1:context.Context):Promise<void>;
+
+export function SetQueue(arg1:library.queueClearer):Promise<void>;

frontend/wailsjs/go/library/Library.js

@@ -2,6 +2,10 @@
 // Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
 // This file is automatically generated. DO NOT EDIT
 
+export function FullRescan() {
+  return window['go']['library']['Library']['FullRescan']();
+}
+
 export function GetAlbumTracks(arg1) {
   return window['go']['library']['Library']['GetAlbumTracks'](arg1);
 }
@@ -21,3 +25,7 @@ export function Scan() {
 export function SetContext(arg1) {
   return window['go']['library']['Library']['SetContext'](arg1);
 }
+
+export function SetQueue(arg1) {
+  return window['go']['library']['Library']['SetQueue'](arg1);
+}

frontend/wailsjs/go/models.ts

@@ -1,3 +1,132 @@
+export namespace http {
+	
+	export class Response {
+	    Status: string;
+	    StatusCode: number;
+	    Proto: string;
+	    ProtoMajor: number;
+	    ProtoMinor: number;
+	    Header: Record<string, Array<string>>;
+	    Body: any;
+	    ContentLength: number;
+	    TransferEncoding: string[];
+	    Close: boolean;
+	    Uncompressed: boolean;
+	    Trailer: Record<string, Array<string>>;
+	    Request?: Request;
+	    TLS?: tls.ConnectionState;
+	
+	    static createFrom(source: any = {}) {
+	        return new Response(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Status = source["Status"];
+	        this.StatusCode = source["StatusCode"];
+	        this.Proto = source["Proto"];
+	        this.ProtoMajor = source["ProtoMajor"];
+	        this.ProtoMinor = source["ProtoMinor"];
+	        this.Header = source["Header"];
+	        this.Body = source["Body"];
+	        this.ContentLength = source["ContentLength"];
+	        this.TransferEncoding = source["TransferEncoding"];
+	        this.Close = source["Close"];
+	        this.Uncompressed = source["Uncompressed"];
+	        this.Trailer = source["Trailer"];
+	        this.Request = this.convertValues(source["Request"], Request);
+	        this.TLS = this.convertValues(source["TLS"], tls.ConnectionState);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+	export class Request {
+	    Method: string;
+	    URL?: url.URL;
+	    Proto: string;
+	    ProtoMajor: number;
+	    ProtoMinor: number;
+	    Header: Record<string, Array<string>>;
+	    Body: any;
+	    ContentLength: number;
+	    TransferEncoding: string[];
+	    Close: boolean;
+	    Host: string;
+	    Form: Record<string, Array<string>>;
+	    PostForm: Record<string, Array<string>>;
+	    MultipartForm?: multipart.Form;
+	    Trailer: Record<string, Array<string>>;
+	    RemoteAddr: string;
+	    RequestURI: string;
+	    TLS?: tls.ConnectionState;
+	    Response?: Response;
+	    Pattern: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new Request(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Method = source["Method"];
+	        this.URL = this.convertValues(source["URL"], url.URL);
+	        this.Proto = source["Proto"];
+	        this.ProtoMajor = source["ProtoMajor"];
+	        this.ProtoMinor = source["ProtoMinor"];
+	        this.Header = source["Header"];
+	        this.Body = source["Body"];
+	        this.ContentLength = source["ContentLength"];
+	        this.TransferEncoding = source["TransferEncoding"];
+	        this.Close = source["Close"];
+	        this.Host = source["Host"];
+	        this.Form = source["Form"];
+	        this.PostForm = source["PostForm"];
+	        this.MultipartForm = this.convertValues(source["MultipartForm"], multipart.Form);
+	        this.Trailer = source["Trailer"];
+	        this.RemoteAddr = source["RemoteAddr"];
+	        this.RequestURI = source["RequestURI"];
+	        this.TLS = this.convertValues(source["TLS"], tls.ConnectionState);
+	        this.Response = this.convertValues(source["Response"], Response);
+	        this.Pattern = source["Pattern"];
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+
+}
+
 export namespace library {
 	
 	export class Album {
@@ -51,6 +180,163 @@ export namespace library {
 
 }
 
+export namespace multipart {
+	
+	export class FileHeader {
+	    Filename: string;
+	    Header: Record<string, Array<string>>;
+	    Size: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new FileHeader(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Filename = source["Filename"];
+	        this.Header = source["Header"];
+	        this.Size = source["Size"];
+	    }
+	}
+	export class Form {
+	    Value: Record<string, Array<string>>;
+	    File: Record<string, Array<FileHeader>>;
+	
+	    static createFrom(source: any = {}) {
+	        return new Form(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Value = source["Value"];
+	        this.File = this.convertValues(source["File"], Array<FileHeader>, true);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+
+}
+
+export namespace net {
+	
+	export class IPNet {
+	    IP: number[];
+	    Mask: number[];
+	
+	    static createFrom(source: any = {}) {
+	        return new IPNet(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.IP = source["IP"];
+	        this.Mask = source["Mask"];
+	    }
+	}
+
+}
+
+export namespace pkix {
+	
+	export class AttributeTypeAndValue {
+	    Type: number[];
+	    Value: any;
+	
+	    static createFrom(source: any = {}) {
+	        return new AttributeTypeAndValue(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Type = source["Type"];
+	        this.Value = source["Value"];
+	    }
+	}
+	export class Extension {
+	    Id: number[];
+	    Critical: boolean;
+	    Value: number[];
+	
+	    static createFrom(source: any = {}) {
+	        return new Extension(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Id = source["Id"];
+	        this.Critical = source["Critical"];
+	        this.Value = source["Value"];
+	    }
+	}
+	export class Name {
+	    Country: string[];
+	    Organization: string[];
+	    OrganizationalUnit: string[];
+	    Locality: string[];
+	    Province: string[];
+	    StreetAddress: string[];
+	    PostalCode: string[];
+	    SerialNumber: string;
+	    CommonName: string;
+	    Names: AttributeTypeAndValue[];
+	    ExtraNames: AttributeTypeAndValue[];
+	
+	    static createFrom(source: any = {}) {
+	        return new Name(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Country = source["Country"];
+	        this.Organization = source["Organization"];
+	        this.OrganizationalUnit = source["OrganizationalUnit"];
+	        this.Locality = source["Locality"];
+	        this.Province = source["Province"];
+	        this.StreetAddress = source["StreetAddress"];
+	        this.PostalCode = source["PostalCode"];
+	        this.SerialNumber = source["SerialNumber"];
+	        this.CommonName = source["CommonName"];
+	        this.Names = this.convertValues(source["Names"], AttributeTypeAndValue);
+	        this.ExtraNames = this.convertValues(source["ExtraNames"], AttributeTypeAndValue);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+
+}
+
 export namespace playlist {
 	
 	export class Summary {
@@ -134,3 +420,318 @@ export namespace playlist {
 
 }
 
+export namespace tls {
+	
+	export class ConnectionState {
+	    Version: number;
+	    HandshakeComplete: boolean;
+	    DidResume: boolean;
+	    CipherSuite: number;
+	    CurveID: number;
+	    NegotiatedProtocol: string;
+	    NegotiatedProtocolIsMutual: boolean;
+	    ServerName: string;
+	    PeerCertificates: x509.Certificate[];
+	    VerifiedChains: x509.Certificate[][];
+	    SignedCertificateTimestamps: number[][];
+	    OCSPResponse: number[];
+	    TLSUnique: number[];
+	    ECHAccepted: boolean;
+	
+	    static createFrom(source: any = {}) {
+	        return new ConnectionState(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Version = source["Version"];
+	        this.HandshakeComplete = source["HandshakeComplete"];
+	        this.DidResume = source["DidResume"];
+	        this.CipherSuite = source["CipherSuite"];
+	        this.CurveID = source["CurveID"];
+	        this.NegotiatedProtocol = source["NegotiatedProtocol"];
+	        this.NegotiatedProtocolIsMutual = source["NegotiatedProtocolIsMutual"];
+	        this.ServerName = source["ServerName"];
+	        this.PeerCertificates = this.convertValues(source["PeerCertificates"], x509.Certificate);
+	        this.VerifiedChains = this.convertValues(source["VerifiedChains"], x509.Certificate);
+	        this.SignedCertificateTimestamps = source["SignedCertificateTimestamps"];
+	        this.OCSPResponse = source["OCSPResponse"];
+	        this.TLSUnique = source["TLSUnique"];
+	        this.ECHAccepted = source["ECHAccepted"];
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+
+}
+
+export namespace url {
+	
+	export class Userinfo {
+	
+	
+	    static createFrom(source: any = {}) {
+	        return new Userinfo(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	
+	    }
+	}
+	export class URL {
+	    Scheme: string;
+	    Opaque: string;
+	    // Go type: Userinfo
+	    User?: any;
+	    Host: string;
+	    Path: string;
+	    RawPath: string;
+	    OmitHost: boolean;
+	    ForceQuery: boolean;
+	    RawQuery: string;
+	    Fragment: string;
+	    RawFragment: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new URL(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Scheme = source["Scheme"];
+	        this.Opaque = source["Opaque"];
+	        this.User = this.convertValues(source["User"], null);
+	        this.Host = source["Host"];
+	        this.Path = source["Path"];
+	        this.RawPath = source["RawPath"];
+	        this.OmitHost = source["OmitHost"];
+	        this.ForceQuery = source["ForceQuery"];
+	        this.RawQuery = source["RawQuery"];
+	        this.Fragment = source["Fragment"];
+	        this.RawFragment = source["RawFragment"];
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+
+}
+
+export namespace x509 {
+	
+	export class PolicyMapping {
+	    // Go type: OID
+	    IssuerDomainPolicy: any;
+	    // Go type: OID
+	    SubjectDomainPolicy: any;
+	
+	    static createFrom(source: any = {}) {
+	        return new PolicyMapping(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.IssuerDomainPolicy = this.convertValues(source["IssuerDomainPolicy"], null);
+	        this.SubjectDomainPolicy = this.convertValues(source["SubjectDomainPolicy"], null);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+	export class OID {
+	
+	
+	    static createFrom(source: any = {}) {
+	        return new OID(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	
+	    }
+	}
+	export class Certificate {
+	    Raw: number[];
+	    RawTBSCertificate: number[];
+	    RawSubjectPublicKeyInfo: number[];
+	    RawSubject: number[];
+	    RawIssuer: number[];
+	    Signature: number[];
+	    SignatureAlgorithm: number;
+	    PublicKeyAlgorithm: number;
+	    PublicKey: any;
+	    Version: number;
+	    // Go type: big
+	    SerialNumber?: any;
+	    Issuer: pkix.Name;
+	    Subject: pkix.Name;
+	    // Go type: time
+	    NotBefore: any;
+	    // Go type: time
+	    NotAfter: any;
+	    KeyUsage: number;
+	    Extensions: pkix.Extension[];
+	    ExtraExtensions: pkix.Extension[];
+	    UnhandledCriticalExtensions: number[][];
+	    ExtKeyUsage: number[];
+	    UnknownExtKeyUsage: number[][];
+	    BasicConstraintsValid: boolean;
+	    IsCA: boolean;
+	    MaxPathLen: number;
+	    MaxPathLenZero: boolean;
+	    SubjectKeyId: number[];
+	    AuthorityKeyId: number[];
+	    OCSPServer: string[];
+	    IssuingCertificateURL: string[];
+	    DNSNames: string[];
+	    EmailAddresses: string[];
+	    IPAddresses: number[][];
+	    URIs: url.URL[];
+	    PermittedDNSDomainsCritical: boolean;
+	    PermittedDNSDomains: string[];
+	    ExcludedDNSDomains: string[];
+	    PermittedIPRanges: net.IPNet[];
+	    ExcludedIPRanges: net.IPNet[];
+	    PermittedEmailAddresses: string[];
+	    ExcludedEmailAddresses: string[];
+	    PermittedURIDomains: string[];
+	    ExcludedURIDomains: string[];
+	    CRLDistributionPoints: string[];
+	    PolicyIdentifiers: number[][];
+	    Policies: OID[];
+	    InhibitAnyPolicy: number;
+	    InhibitAnyPolicyZero: boolean;
+	    InhibitPolicyMapping: number;
+	    InhibitPolicyMappingZero: boolean;
+	    RequireExplicitPolicy: number;
+	    RequireExplicitPolicyZero: boolean;
+	    PolicyMappings: PolicyMapping[];
+	
+	    static createFrom(source: any = {}) {
+	        return new Certificate(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Raw = source["Raw"];
+	        this.RawTBSCertificate = source["RawTBSCertificate"];
+	        this.RawSubjectPublicKeyInfo = source["RawSubjectPublicKeyInfo"];
+	        this.RawSubject = source["RawSubject"];
+	        this.RawIssuer = source["RawIssuer"];
+	        this.Signature = source["Signature"];
+	        this.SignatureAlgorithm = source["SignatureAlgorithm"];
+	        this.PublicKeyAlgorithm = source["PublicKeyAlgorithm"];
+	        this.PublicKey = source["PublicKey"];
+	        this.Version = source["Version"];
+	        this.SerialNumber = this.convertValues(source["SerialNumber"], null);
+	        this.Issuer = this.convertValues(source["Issuer"], pkix.Name);
+	        this.Subject = this.convertValues(source["Subject"], pkix.Name);
+	        this.NotBefore = this.convertValues(source["NotBefore"], null);
+	        this.NotAfter = this.convertValues(source["NotAfter"], null);
+	        this.KeyUsage = source["KeyUsage"];
+	        this.Extensions = this.convertValues(source["Extensions"], pkix.Extension);
+	        this.ExtraExtensions = this.convertValues(source["ExtraExtensions"], pkix.Extension);
+	        this.UnhandledCriticalExtensions = source["UnhandledCriticalExtensions"];
+	        this.ExtKeyUsage = source["ExtKeyUsage"];
+	        this.UnknownExtKeyUsage = source["UnknownExtKeyUsage"];
+	        this.BasicConstraintsValid = source["BasicConstraintsValid"];
+	        this.IsCA = source["IsCA"];
+	        this.MaxPathLen = source["MaxPathLen"];
+	        this.MaxPathLenZero = source["MaxPathLenZero"];
+	        this.SubjectKeyId = source["SubjectKeyId"];
+	        this.AuthorityKeyId = source["AuthorityKeyId"];
+	        this.OCSPServer = source["OCSPServer"];
+	        this.IssuingCertificateURL = source["IssuingCertificateURL"];
+	        this.DNSNames = source["DNSNames"];
+	        this.EmailAddresses = source["EmailAddresses"];
+	        this.IPAddresses = source["IPAddresses"];
+	        this.URIs = this.convertValues(source["URIs"], url.URL);
+	        this.PermittedDNSDomainsCritical = source["PermittedDNSDomainsCritical"];
+	        this.PermittedDNSDomains = source["PermittedDNSDomains"];
+	        this.ExcludedDNSDomains = source["ExcludedDNSDomains"];
+	        this.PermittedIPRanges = this.convertValues(source["PermittedIPRanges"], net.IPNet);
+	        this.ExcludedIPRanges = this.convertValues(source["ExcludedIPRanges"], net.IPNet);
+	        this.PermittedEmailAddresses = source["PermittedEmailAddresses"];
+	        this.ExcludedEmailAddresses = source["ExcludedEmailAddresses"];
+	        this.PermittedURIDomains = source["PermittedURIDomains"];
+	        this.ExcludedURIDomains = source["ExcludedURIDomains"];
+	        this.CRLDistributionPoints = source["CRLDistributionPoints"];
+	        this.PolicyIdentifiers = source["PolicyIdentifiers"];
+	        this.Policies = this.convertValues(source["Policies"], OID);
+	        this.InhibitAnyPolicy = source["InhibitAnyPolicy"];
+	        this.InhibitAnyPolicyZero = source["InhibitAnyPolicyZero"];
+	        this.InhibitPolicyMapping = source["InhibitPolicyMapping"];
+	        this.InhibitPolicyMappingZero = source["InhibitPolicyMappingZero"];
+	        this.RequireExplicitPolicy = source["RequireExplicitPolicy"];
+	        this.RequireExplicitPolicyZero = source["RequireExplicitPolicyZero"];
+	        this.PolicyMappings = this.convertValues(source["PolicyMappings"], PolicyMapping);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+
+}
+