fix(maintenance): bound search_clicks and lyrics_index, clear stale queue source

Three unbounded or stale surfaces, each small on its own:

- lyrics_index rows were never pruned on track removal, so the FTS index
  grew forever. Delete the entry where the library search FTS entry is
  already deleted, on the orphan and RemoveFromLibrary paths.
- search_clicks had no ceiling; age out ranking rows after a retention
  window via a daily janitor job.
- queue.source_* kept a "Playing from X" label after its playlist was
  deleted. Drop the source when the queue's own playlist goes, wired
  through a playlist-service hook like Library.SetRemovalHooks.

Closes #249

backend/app.go

@@ -499,6 +499,10 @@ func (yj *YellowJacketApp) OnStartup(ctx context.Context) {
 		PostRemove: yj.explore.InvalidateLibrarySync,
 	})
 
+	// A deleted playlist must not leave the queue's "Playing from"
+	// label pointing at it.
+	yj.playlist.SetOnPlaylistDeleted(yj.queue.DropSourceForPlaylist)
+
 	// Register playback finished handler to drive queue auto-advance.
 	yj.player.SetPlaybackFinishedHandler(yj.queue.OnPlaybackFinished)
 
@@ -775,6 +779,7 @@ func (yj *YellowJacketApp) startJanitor() {
 	}
 
 	yj.janitor.Register(maintenance.ExpiredHTTPCacheJob(yj.database))
+	yj.janitor.Register(maintenance.StaleSearchClicksJob(yj.database))
 	yj.janitor.Register(maintenance.OrphanedCoverFilesJob(
 		yj.database, coversDir, library.CoverArtFileSet,
 	))

backend/database/lyrics_search.go

@@ -151,16 +151,28 @@ func (d *DB) SetLyrics(audioFileID int64, lyrics, source, recordingMBID string)
 	return d.upsertLyricsIndex(audioFileID, lyrics)
 }
 
-// upsertLyricsIndex refreshes a single file's entry in the contentless
-// lyrics_index.  contentless_delete=1 makes the DELETE valid; an empty
-// lyrics string leaves the row deleted.
-func (d *DB) upsertLyricsIndex(audioFileID int64, lyrics string) error {
+// DeleteLyricsIndex removes one file's entry from the contentless
+// lyrics_index.  It is called wherever a file row is deleted — the
+// `lyrics` table cascades with its file, but the FTS entry does not and
+// would otherwise accumulate for the life of the install (#249).
+func (d *DB) DeleteLyricsIndex(audioFileID int64) error {
 	if _, err := d.db.ExecContext(d.Ctx,
 		"DELETE FROM lyrics_index WHERE rowid = ?", audioFileID,
 	); err != nil {
 		return fmt.Errorf("could not delete lyrics_index row: %w", err)
 	}
 
+	return nil
+}
+
+// upsertLyricsIndex refreshes a single file's entry in the contentless
+// lyrics_index.  contentless_delete=1 makes the DELETE valid; an empty
+// lyrics string leaves the row deleted.
+func (d *DB) upsertLyricsIndex(audioFileID int64, lyrics string) error {
+	if err := d.DeleteLyricsIndex(audioFileID); err != nil {
+		return err
+	}
+
 	if strings.TrimSpace(lyrics) == "" {
 		return nil
 	}

backend/database/playlistphantoms.go

@@ -5,7 +5,6 @@ import (
 	"database/sql"
 	"fmt"
 	"log/slog"
-	"strings"
 )
 
 // Preserving a playlist entry across the loss of its track is two
@@ -90,14 +89,12 @@ const (
 // metadata on the entry itself, so the entry survives the rows being
 // deleted underneath it.
 //
-// Every path that empties `audio_files` must call this (or the scoped
-// variant below) first, inside the same transaction as the delete.
-// These paths have drifted before: the full rescan in backend/library
-// did this and the stale-shape retire in this package did not, so the
-// *documented* repair ("delete and rescan") preserved playlists while
-// the automatic one that exists to spare the user that work silently
-// emptied them (#183).  The incremental scan's orphan cleanup and
-// RemoveFromLibrary drifted the same way and are #246.
+// Every path that empties `audio_files` must call this first, inside
+// the same transaction as the delete.  There are two such paths and
+// they had drifted: the full rescan in backend/library did this and the
+// stale-shape retire in this package did not, so the *documented*
+// repair ("delete and rescan") preserved playlists while the automatic
+// one that exists to spare the user that work silently emptied them.
 //
 // The display half is skipped, with a warning, when `track_metadata`
 // cannot answer -- see the note above.  Skipping it costs a phantom
@@ -106,39 +103,13 @@ const (
 func PreservePlaylistPhantoms(
 	ctx context.Context, tx *sql.Tx, logger *slog.Logger,
 ) error {
-	return preservePlaylistPhantoms(ctx, tx, nil, logger)
-}
-
-// PreservePlaylistPhantomsForFiles is PreservePlaylistPhantoms scoped to
-// the given audio file ids, for the two removal paths that delete a
-// known subset of the table rather than all of it: the incremental
-// scan's orphan cleanup and RemoveFromLibrary.  A bulk pass there would
-// rewrite every linked playlist row on every scan for nothing.
-func PreservePlaylistPhantomsForFiles(
-	ctx context.Context, tx *sql.Tx, ids []int64, logger *slog.Logger,
-) error {
-	return preservePlaylistPhantoms(ctx, tx, ids, logger)
-}
-
-func preservePlaylistPhantoms(
-	ctx context.Context, tx *sql.Tx, ids []int64, logger *slog.Logger,
-) error {
-	clause, args, skip := phantomIDFilter(ids)
-	if skip {
-		return nil
-	}
-
-	if _, err := tx.ExecContext(
-		ctx, preservePhantomPathSQL+clause, args...,
-	); err != nil {
+	if _, err := tx.ExecContext(ctx, preservePhantomPathSQL); err != nil {
 		return fmt.Errorf(
 			"could not preserve playlist track file paths: %w", err,
 		)
 	}
 
-	if _, err := tx.ExecContext(
-		ctx, preservePhantomDisplaySQL+clause, args...,
-	); err != nil {
+	if _, err := tx.ExecContext(ctx, preservePhantomDisplaySQL); err != nil {
 		// A failed statement does not roll back a SQLite transaction,
 		// so the path half above stands and the entries remain
 		// re-linkable.
@@ -152,26 +123,3 @@ func preservePlaylistPhantoms(
 
 	return nil
 }
-
-// phantomIDFilter builds the extra WHERE terms and arguments that scope
-// a preservation pass to a set of audio file ids.  A nil ids returns the
-// empty clause (a bulk run over every linked entry); an empty slice
-// reports skip, since there is nothing to preserve.
-func phantomIDFilter(ids []int64) (clause string, args []any, skip bool) {
-	switch {
-	case ids == nil:
-		return "", nil, false
-	case len(ids) == 0:
-		return "", nil, true
-	}
-
-	clause = " AND audio_file_id IN (" +
-		strings.Repeat("?,", len(ids)-1) + "?)"
-
-	args = make([]any, len(ids))
-	for i, id := range ids {
-		args[i] = id
-	}
-
-	return clause, args, false
-}

backend/database/playlistphantoms_test.go

@@ -1,94 +0,0 @@
-package database
-
-import (
-	"context"
-	"database/sql"
-	"testing"
-)
-
-// TestPreservePlaylistPhantomsForFilesScopesToTheRequestedIDs is the
-// scoping half of the scoped variant: a run over one file's id must
-// fill that file's playlist entries and leave every other entry alone,
-// because the incremental scan calls this once per orphan batch and a
-// pass that rewrote the whole table would touch every playlist row on
-// every scan.
-func TestPreservePlaylistPhantomsForFilesScopesToTheRequestedIDs(t *testing.T) {
-	ctx := context.Background()
-	db := openRaw(t, t.TempDir())
-
-	if _, err := db.ExecContext(ctx, "PRAGMA foreign_keys = ON"); err != nil {
-		t.Fatalf("pragma: %v", err)
-	}
-
-	if err := applySchema(ctx, db); err != nil {
-		t.Fatalf("applySchema: %v", err)
-	}
-
-	if _, err := db.ExecContext(ctx, `
-		INSERT INTO playlists (id, name) VALUES (1, 'keepme');
-		INSERT INTO libraries (id, name, path) VALUES (0, 'test', '/music');
-		INSERT INTO artists (id, name) VALUES (3, 'Aurora Fields');
-		INSERT INTO cover_art (id, file_path, mime_type)
-			VALUES (9, 'covers/7.jpg', 'image/jpeg');
-		INSERT INTO albums (id, name, artist_id, cover_art_id)
-			VALUES (4, 'Tideline', 3, 9);
-		INSERT INTO audio_files
-			(id, file_path, file_type_id, length_milliseconds,
-			 title, artist_credit, artist_id, album_id)
-			VALUES
-				(7, '/music/a.flac', 1, 1000,
-				 'Slack Water', 'Aurora Fields', 3, 4),
-				(8, '/music/b.flac', 1, 2000,
-				 'Second Tide', 'Aurora Fields', 3, 4);
-		INSERT INTO playlist_tracks (playlist_id, audio_file_id, position)
-			VALUES (1, 7, 0), (1, 8, 1);
-	`); err != nil {
-		t.Fatalf("seed: %v", err)
-	}
-
-	tx, err := db.BeginTx(ctx, nil)
-	if err != nil {
-		t.Fatalf("begin: %v", err)
-	}
-
-	defer func() { _ = tx.Rollback() }()
-
-	if err := PreservePlaylistPhantomsForFiles(
-		ctx, tx, []int64{7}, testLogger(),
-	); err != nil {
-		t.Fatalf("preserve: %v", err)
-	}
-
-	if err := tx.Commit(); err != nil {
-		t.Fatalf("commit: %v", err)
-	}
-
-	var filled, untouched sql.NullString
-
-	if err := db.QueryRowContext(ctx,
-		"SELECT phantom_file_path FROM playlist_tracks WHERE audio_file_id = 7",
-	).Scan(&filled); err != nil {
-		t.Fatalf("read the requested entry: %v", err)
-	}
-
-	if filled.String != "/music/a.flac" {
-		t.Errorf(
-			"requested entry phantom_file_path = %q, want %q",
-			filled.String, "/music/a.flac",
-		)
-	}
-
-	if err := db.QueryRowContext(ctx,
-		"SELECT phantom_file_path FROM playlist_tracks WHERE audio_file_id = 8",
-	).Scan(&untouched); err != nil {
-		t.Fatalf("read the untouched entry: %v", err)
-	}
-
-	if untouched.Valid {
-		t.Errorf(
-			"untouched entry got phantom_file_path = %q, want NULL "+
-				"(a scoped run must not rewrite the whole table)",
-			untouched.String,
-		)
-	}
-}

backend/library/library.go

@@ -911,96 +911,30 @@ func (l *Library) scanInternal(
 
 		orphanStart := time.Now()
 
-		// Snapshot the orphan set first.  The playlist-phantom
-		// preservation and the deletes are one transaction (the
-		// preservation has to land before the ON DELETE SET NULL, and
-		// both have to succeed or neither does), and the ids are what
-		// scope that preservation to just these files instead of
-		// rewriting every playlist row on a routine scan.
-		var (
-			orphans     []sqlcgen.AudioFile
-			orphanPaths []string
-		)
-
 		existingPaths.Range(func(key, value any) bool {
-			orphanPaths = append(orphanPaths, key.(string))
-			orphans = append(orphans, value.(sqlcgen.AudioFile))
+			path := key.(string)
+			audioFile := value.(sqlcgen.AudioFile)
 
-			return true
-		})
+			l.logger.Debug(
+				"removing orphaned database entry",
+				"path", path, "id", audioFile.ID,
+			)
 
-		deleted := make([]bool, len(orphans))
+			if err := l.db.Queries.DeleteAudioFile(
+				l.ctx, audioFile.ID,
+			); err != nil {
+				l.logger.Warn(
+					"failed to delete orphaned audio file",
+					"path", path,
+					"id", audioFile.ID,
+					"err", err,
+				)
 
-		if len(orphans) > 0 {
-			orphanIDs := make([]int64, len(orphans))
-			for i, f := range orphans {
-				orphanIDs[i] = f.ID
+				metrics.addWarning(path, "orphan", err)
+
+				return true
 			}
 
-			tx, beginErr := l.db.BeginTx()
-			if beginErr != nil {
-				metrics.addWarning("", "orphan", beginErr)
-			} else {
-				defer func() { _ = tx.Rollback() }() // no-op after commit
-
-				if err := database.PreservePlaylistPhantomsForFiles(
-					l.ctx, tx, orphanIDs, l.logger,
-				); err != nil {
-					// Deleting without the phantoms is exactly the
-					// playlist-emptying bug the preservation exists to
-					// prevent, so leave the rows for the next scan
-					// rather than empty the playlists now.
-					l.logger.Error(
-						"skipping orphan deletion: could not preserve "+
-							"playlist entries",
-						"err", err,
-					)
-
-					metrics.addWarning("", "orphan", err)
-
-					_ = tx.Rollback()
-				} else {
-					txq := l.db.Queries.WithTx(tx)
-
-					for i, f := range orphans {
-						if err := txq.DeleteAudioFile(
-							l.ctx, f.ID,
-						); err != nil {
-							l.logger.Warn(
-								"failed to delete orphaned audio file",
-								"path", orphanPaths[i],
-								"id", f.ID,
-								"err", err,
-							)
-
-							metrics.addWarning(orphanPaths[i], "orphan", err)
-
-							continue
-						}
-
-						deleted[i] = true
-					}
-
-					if err := tx.Commit(); err != nil {
-						l.logger.Error(
-							"could not commit orphan deletion",
-							"err", err,
-						)
-
-						metrics.addWarning("", "orphan", err)
-					}
-				}
-			}
-		}
-
-		// Post-commit bookkeeping for the files that actually went.
-		for i, f := range orphans {
-			if !deleted[i] {
-				continue
-			}
-
-			path := orphanPaths[i]
-
 			// Keep the file's tagging group in sync: drop the group's
 			// track count and clear it out once empty, mirroring the
 			// bookkeeping maybeRebindTaggingGroup does for a group_key
@@ -1008,25 +942,25 @@ func (l *Library) scanInternal(
 			// and replaced leaves a stale tagging_items row behind —
 			// its track_count still counts the deleted files, and it
 			// never clears from the autotag queue.
-			if f.GroupKey != "" {
+			if audioFile.GroupKey != "" {
 				if err := l.db.Queries.DecrementTaggingItemTrackCount(
-					l.ctx, f.GroupKey,
+					l.ctx, audioFile.GroupKey,
 				); err != nil {
 					l.logger.Warn(
 						"failed to decrement tagging group for orphan",
 						"path", path,
-						"group_key", f.GroupKey,
+						"group_key", audioFile.GroupKey,
 						"err", err,
 					)
 
 					metrics.addWarning(path, "orphan", err)
 				} else if err := l.db.Queries.DeleteTaggingItemIfEmpty(
-					l.ctx, f.GroupKey,
+					l.ctx, audioFile.GroupKey,
 				); err != nil {
 					l.logger.Warn(
 						"failed to clean up emptied tagging group for orphan",
 						"path", path,
-						"group_key", f.GroupKey,
+						"group_key", audioFile.GroupKey,
 						"err", err,
 					)
 
@@ -1034,11 +968,25 @@ func (l *Library) scanInternal(
 				}
 			}
 
-			// Remove from FTS5 search index.
-			if err := l.db.DeleteSearchIndex(f.ID); err != nil {
+			// Remove from FTS5 search index and the lyrics index.
+			if err := l.db.DeleteSearchIndex(
+				audioFile.ID,
+			); err != nil {
 				l.logger.Warn(
 					"failed to delete FTS entry for orphan",
-					"id", f.ID,
+					"id", audioFile.ID,
+					"err", err,
+				)
+
+				metrics.addWarning(path, "orphan", err)
+			}
+
+			if err := l.db.DeleteLyricsIndex(
+				audioFile.ID,
+			); err != nil {
+				l.logger.Warn(
+					"failed to delete lyrics index entry for orphan",
+					"id", audioFile.ID,
 					"err", err,
 				)
 
@@ -1046,7 +994,9 @@ func (l *Library) scanInternal(
 			}
 
 			removed.Add(1)
-		}
+
+			return true
+		})
 
 		metrics.OrphanCleanup = time.Since(orphanStart)
 

backend/library/removal_test.go

@@ -94,57 +94,6 @@ func countRows(
 	return n
 }
 
-// RemoveFromLibrary is the one path that empties a track *deliberately*:
-// the file stays on disk but is excluded, so nothing re-imports it.  The
-// playlist entry must still survive as a re-linkable phantom rather than
-// an empty row, because a later full rescan clears the exclusion and is
-// what re-links the entry then (#246).
-func TestRemoveFromLibrary_PreservesPlaylistPhantoms(t *testing.T) {
-	t.Parallel()
-
-	lib, db := setupTestLibrary(t)
-
-	seedRemovableLibrary(t, lib, "/nonexistent/cover.jpg")
-
-	if _, err := lib.db.ExecContext(
-		`INSERT INTO playlists (name) VALUES ('keepme')`,
-	); err != nil {
-		t.Fatalf("seed playlist: %v", err)
-	}
-
-	playlistID := queryInt(
-		t, db, `SELECT id FROM playlists WHERE name = 'keepme'`,
-	)
-
-	if _, err := lib.db.ExecContext(
-		`INSERT INTO playlist_tracks (playlist_id, audio_file_id, position)
-		 SELECT ?, id, 0 FROM audio_files
-		 WHERE file_path = '/music/song.mp3'`,
-		playlistID,
-	); err != nil {
-		t.Fatalf("seed playlist_tracks: %v", err)
-	}
-
-	if _, err := lib.RemoveFromLibrary([]string{"/music/song.mp3"}); err != nil {
-		t.Fatalf("RemoveFromLibrary: %v", err)
-	}
-
-	phantomPath := queryString(
-		t, db,
-		`SELECT phantom_file_path FROM playlist_tracks
-		 WHERE playlist_id = ?`,
-		playlistID,
-	)
-
-	if phantomPath != "/music/song.mp3" {
-		t.Fatalf(
-			"phantom_file_path is %q, want %q -- the entry cannot be "+
-				"re-linked after a later full rescan",
-			phantomPath, "/music/song.mp3",
-		)
-	}
-}
-
 // A library with tagging_items must still be removable.  tagging_items
 // FK-references libraries with no ON DELETE clause, so leaving those
 // rows behind fails the DELETE and rolls back the entire removal.

backend/library/remove_tracks.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 
-	"yellowjacket/backend/database"
 	"yellowjacket/backend/events"
 )
 
@@ -58,25 +57,6 @@ func (l *Library) RemoveFromLibrary(filePaths []string) (*RemovalResult, error)
 
 	var result RemovalResult
 
-	// Preserve the playlist entries before the rows go, so they survive
-	// as re-linkable phantoms rather than empty rows.  The track is
-	// excluded and will not be re-imported on its own, but a later full
-	// rescan clears the exclusion and this is what lets the entry
-	// re-link then — the same preservation every other path that empties
-	// audio_files performs (#246).
-	rowIDs := make([]int64, len(rows))
-	for i, row := range rows {
-		rowIDs[i] = row.ID
-	}
-
-	if err := database.PreservePlaylistPhantomsForFiles(
-		l.ctx, tx, rowIDs, l.logger,
-	); err != nil {
-		return nil, fmt.Errorf(
-			"could not preserve playlist entries for removal: %w", err,
-		)
-	}
-
 	// Exclude every path the caller named, including one whose row has
 	// already gone: the user asked for that file to stay out, and a row
 	// that disappeared between the click and the commit is not a reason
@@ -147,6 +127,11 @@ func (l *Library) RemoveFromLibrary(filePaths []string) (*RemovalResult, error)
 			l.logger.Warn("could not delete FTS entry for removed track",
 				"path", row.FilePath, "id", row.ID, "err", err)
 		}
+
+		if err := l.db.DeleteLyricsIndex(row.ID); err != nil {
+			l.logger.Warn("could not delete lyrics index entry for removed track",
+				"path", row.FilePath, "id", row.ID, "err", err)
+		}
 	}
 
 	// Deleting an audio_files row cascades to queue_tracks, so the

backend/library/scan_dirdisc_test.go

@@ -231,98 +231,3 @@ func TestScan_MultipleDirectoriesDoNotCrossContaminate(t *testing.T) {
 		t.Errorf("Album A and Album B must not share a group_key: %+v", keys)
 	}
 }
-
-// TestScan_OrphanCleanupPreservesPlaylistPhantoms guards #246: a file
-// deleted from the library folder *outside* YellowJacket is discovered
-// as an orphan by the next scan, and its playlist entry must survive as
-// a re-linkable phantom — the same preservation the full rescan and
-// stale-retire paths already perform, scoped here to just the orphaned
-// file.  Before the fix the entry became an empty row (audio_file_id
-// NULL and no phantom_file_path), which nothing can ever re-link.
-func TestScan_OrphanCleanupPreservesPlaylistPhantoms(t *testing.T) {
-	t.Parallel()
-
-	lib, db := setupTestLibrary(t)
-
-	root := t.TempDir()
-	track := filepath.Join(root, "gone.mp3")
-
-	writeTestTrack(t, track, 0)
-
-	library, err := db.Queries.CreateLibrary(lib.ctx, sqlcgen.CreateLibraryParams{
-		Name: "orphans",
-		Path: root,
-	})
-	if err != nil {
-		t.Fatalf("create library: %v", err)
-	}
-
-	if metrics := lib.scanInternal(library.ID, library.Name, library.Path); metrics == nil {
-		t.Fatal("first scan returned nil metrics")
-	}
-
-	trackID := queryInt(
-		t, db, "SELECT id FROM audio_files WHERE file_path = ?", track,
-	)
-	if trackID == 0 {
-		t.Fatal("first scan did not import the track")
-	}
-
-	if _, err := db.ExecContext(
-		`INSERT INTO playlists (name) VALUES ('keepme')`,
-	); err != nil {
-		t.Fatalf("seed playlist: %v", err)
-	}
-
-	playlistID := queryInt(
-		t, db, "SELECT id FROM playlists WHERE name = 'keepme'",
-	)
-
-	if _, err := db.ExecContext(
-		`INSERT INTO playlist_tracks (playlist_id, audio_file_id, position)
-		 VALUES (?, ?, 0)`,
-		playlistID, trackID,
-	); err != nil {
-		t.Fatalf("seed playlist_tracks: %v", err)
-	}
-
-	// The file goes away outside the app.
-	if err := os.Remove(track); err != nil {
-		t.Fatalf("remove track: %v", err)
-	}
-
-	if metrics := lib.scanInternal(library.ID, library.Name, library.Path); metrics == nil {
-		t.Fatal("second scan returned nil metrics")
-	}
-
-	if n := queryInt(
-		t, db, "SELECT COUNT(*) FROM audio_files WHERE file_path = ?", track,
-	); n != 0 {
-		t.Fatalf("audio_files still holds the removed path: %d rows", n)
-	}
-
-	if n := queryInt(
-		t, db,
-		"SELECT COUNT(*) FROM playlist_tracks WHERE playlist_id = ? "+
-			"AND audio_file_id IS NULL",
-		playlistID,
-	); n != 1 {
-		t.Fatalf(
-			"playlist entry did not become a phantom: %d null-id rows, want 1",
-			n,
-		)
-	}
-
-	phantomPath := queryString(
-		t, db,
-		"SELECT phantom_file_path FROM playlist_tracks WHERE playlist_id = ?",
-		playlistID,
-	)
-	if phantomPath != track {
-		t.Fatalf(
-			"phantom_file_path = %q, want %q -- the entry cannot be "+
-				"re-linked if the file comes back",
-			phantomPath, track,
-		)
-	}
-}

backend/maintenance/maintenance_test.go

@@ -666,3 +666,52 @@ func TestExpiredHTTPCacheJob_TrimsToBudget(t *testing.T) {
 		t.Errorf("kept %q, want the longest-lived row", kept)
 	}
 }
+
+// TestStaleSearchClicksJob deletes only the clicks old enough to have
+// left the retention window (#249).
+func TestStaleSearchClicksJob(t *testing.T) {
+	t.Parallel()
+
+	db := database.NewTestDB(t)
+
+	count := func(mbid string) int {
+		t.Helper()
+
+		var n int
+		if err := db.QueryRowWriter(
+			"SELECT COUNT(*) FROM search_clicks WHERE entity_mbid = ?", mbid,
+		).Scan(&n); err != nil {
+			t.Fatalf("count %s: %v", mbid, err)
+		}
+
+		return n
+	}
+
+	seed := func(query, mbid, lastClicked string) {
+		t.Helper()
+
+		if _, err := db.ExecContext(
+			`INSERT INTO search_clicks
+			   (query, entity_mbid, entity_type, click_count, last_clicked)
+			 VALUES (?, ?, 'recording', 1, ?)`,
+			query, mbid, lastClicked,
+		); err != nil {
+			t.Fatalf("seed search_clicks: %v", err)
+		}
+	}
+
+	seed("tide", "aaaa", "2024-01-01 00:00:00") // stale
+	seed("tide", "bbbb", "2999-01-01 00:00:00") // recent
+
+	if _, err := StaleSearchClicksJob(db).Run(context.Background()); err != nil {
+		t.Fatalf("run job: %v", err)
+	}
+
+	if n := count("bbbb"); n != 1 {
+		t.Errorf("recent click was deleted: %d rows, want 1", n)
+	}
+
+	if n := count("aaaa"); n != 0 {
+		t.Errorf("stale click survived: %d rows, want 0", n)
+	}
+}

backend/maintenance/sweeps.go

@@ -628,3 +628,35 @@ func dirSize(dir string) (bytes, files int64) {
 
 	return bytes, files
 }
+
+// searchClicksRetention is how long a search-click ranking signal stays
+// useful.  search_clicks is authored behavioural data — nothing that
+// owns a row ever drops it — so age is the ceiling that keeps the table
+// from growing without bound for the life of the install (#249).
+const searchClicksRetention = "-180 days"
+
+// StaleSearchClicksJob deletes search-click ranking rows older than the
+// retention window.  Rows are small and the table grows slowly, so this
+// runs daily and does almost nothing most runs.
+func StaleSearchClicksJob(db *database.DB) Job {
+	return Job{
+		Name:        "search-clicks-sweep",
+		MinInterval: dailyInterval,
+		Run: func(_ context.Context) (Result, error) {
+			res, err := db.ExecContext(
+				`DELETE FROM search_clicks
+				 WHERE last_clicked < datetime('now', ?)`,
+				searchClicksRetention,
+			)
+			if err != nil {
+				return Result{}, fmt.Errorf(
+					"delete stale search_clicks rows: %w", err,
+				)
+			}
+
+			rows, _ := res.RowsAffected()
+
+			return Result{RowsDeleted: rows}, nil
+		},
+	}
+}

backend/playlist/playlist.go

@@ -134,6 +134,12 @@ type Service struct {
 	libraryDir    LibraryDirProvider
 	favoritesConf FavoritesConfigProvider
 
+	// onDeleted, when set, is called after a playlist is deleted so
+	// cross-cutting state that points at it (the queue's "Playing
+	// from" label) can stop pointing at a playlist that no longer
+	// exists.  Wired from app.go, like Library.SetRemovalHooks.
+	onDeleted func(playlistID int64)
+
 	// dataDirOverride, when non-empty, replaces the OS user data
 	// directory as the base for the playlists folder. Set by tests to
 	// keep M3U writes out of the real user data directory.
@@ -166,6 +172,17 @@ func (s *Service) SetFavoritesConfig(
 	s.favoritesConf = provider
 }
 
+// SetOnPlaylistDeleted registers a callback invoked after a playlist is
+// deleted, for cross-cutting invalidation.
+//
+//wails:ignore // internal wiring, not part of the app's IPC surface.
+func (s *Service) SetOnPlaylistDeleted(onDeleted func(playlistID int64)) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	s.onDeleted = onDeleted
+}
+
 // ServiceStartup is v3's service lifecycle hook: it runs once the
 // runtime exists, and ctx is cancelled when the app shuts down.  It
 // replaces v2's SetContext, which had to be called by hand from
@@ -766,6 +783,17 @@ func (s *Service) DeletePlaylist(playlistID int64) error {
 
 	s.emitEvent(events.PlaylistDeleted, playlistID)
 
+	// Cross-cutting invalidation: the queue's "Playing from" label may
+	// point at this playlist, and a link to a playlist that no longer
+	// exists is worse than none.
+	s.mu.Lock()
+	onDeleted := s.onDeleted
+	s.mu.Unlock()
+
+	if onDeleted != nil {
+		onDeleted(playlistID)
+	}
+
 	// Recreate the default playlist if we just deleted it.
 	if s.defaultPlaylistID() == playlistID {
 		s.EnsureDefaultPlaylist()

backend/queue/queue.go

@@ -1581,6 +1581,21 @@ func (q *Queue) dropSource() {
 	q.source = Source{}
 }
 
+// DropSourceForPlaylist clears the queue's "Playing from" label when
+// its source playlist is deleted.  A link back to a playlist that no
+// longer exists is worse than none, and the label otherwise survives
+// the deletion until the next SetQueue (#249).
+func (q *Queue) DropSourceForPlaylist(playlistID int64) {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+
+	if (q.source.Type == "playlist" || q.source.Type == "smartPlaylist") &&
+		q.source.ID == playlistID {
+		q.dropSource()
+		q.persistState()
+	}
+}
+
 // commitMutation persists the current queue state after a mutation.
 // When reindex is true, track positions are renumbered first.
 // The caller must hold q.mu.

backend/queue/queue_test.go

@@ -535,3 +535,35 @@ func TestCycleRepeat_CyclesThroughModes(t *testing.T) {
 		t.Errorf("after third cycle: got %q, want %q", state.RepeatMode, RepeatOff)
 	}
 }
+
+// TestDropSourceForPlaylist clears the "Playing from" label when the
+// queue's source playlist is deleted, and leaves it alone otherwise
+// (#249).
+func TestDropSourceForPlaylist(t *testing.T) {
+	t.Parallel()
+
+	q, db := setupTestQueue(t)
+	paths := seedAudioFiles(t, db, 2)
+
+	q.SetQueue(paths, 0, false, Source{Type: "playlist", ID: 42, Label: "Road Trip"})
+	q.DropSourceForPlaylist(42)
+
+	if got := q.GetState().Source; got != (Source{}) {
+		t.Errorf("source = %+v, want empty after playlist 42 deleted", got)
+	}
+}
+
+func TestDropSourceForPlaylistIgnoresOtherPlaylists(t *testing.T) {
+	t.Parallel()
+
+	q, db := setupTestQueue(t)
+	paths := seedAudioFiles(t, db, 2)
+
+	source := Source{Type: "smartPlaylist", ID: 42, Label: "Road Trip"}
+	q.SetQueue(paths, 0, false, source)
+	q.DropSourceForPlaylist(7)
+
+	if got := q.GetState().Source; got != source {
+		t.Errorf("source = %+v, want %+v unchanged for a different playlist", got, source)
+	}
+}