diff --git a/.golangci.yml b/.golangci.yml
index 0804138dc..7df4f8ec3 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -27,6 +27,9 @@ linters:
   disable:
     - staticcheck
   settings:
+    errcheck:
+      exclude-functions:
+        - (*github.com/zeebo/xxh3.Hasher).Write
     gocritic:
       disable-all: true
       enabled-checks:
diff --git a/cmd/artwork.go b/cmd/artwork.go
index e9c910f11..aeaec0e43 100644
--- a/cmd/artwork.go
+++ b/cmd/artwork.go
@@ -59,31 +59,27 @@ var artworkCmd = &cobra.Command{
 }
 
 var artworkExplainCmd = &cobra.Command{
-	Use:   "explain <kind> <id>",
+	Use:   "explain [<kind>] <id>",
 	Short: "Explain why an item's artwork resolved the way it did",
 	Long: "Explain why an item's artwork resolved the way it did.\n\n" +
+		"The item can be given as a bare id, a full artwork id (e.g. al-<id>), or a <kind> <id> pair.\n" +
 		"<kind> is one of: " + kindPrefixes(explainKinds) + ".\n" +
 		"A disc artwork id is the album id and the disc number, joined by a colon: <albumID>:2",
-	Args: cobra.ExactArgs(2),
+	Args: cobra.RangeArgs(1, 2),
 	Run: func(cmd *cobra.Command, args []string) {
-		kind, err := parseArtworkKind(args[0], explainKinds)
-		if err != nil {
-			log.Fatal(cmd.Context(), err)
-		}
-		runExplain(cmd.Context(), kind, args[1])
+		runExplain(cmd.Context(), args)
 	},
 }
 
 var artworkRefreshCmd = &cobra.Command{
-	Use:   "refresh <kind> <id>...",
+	Use:   "refresh [<kind>] <id>...",
 	Short: "Clear an item's artwork state and re-resolve it",
-	Args:  cobra.MinimumNArgs(2),
+	Long: "Clear an item's artwork state and re-resolve it.\n\n" +
+		"Each item can be given as a bare id, a full artwork id (e.g. al-<id>), or a shared\n" +
+		"<kind> <id>... leader. <kind> is one of: " + kindPrefixes(artwork.RefreshableKinds) + ".",
+	Args: cobra.MinimumNArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
-		kind, err := parseArtworkKind(args[0], artwork.RefreshableKinds)
-		if err != nil {
-			log.Fatal(cmd.Context(), err)
-		}
-		runRefresh(cmd.Context(), kind, args[1:])
+		runRefresh(cmd.Context(), args)
 	},
 }
 
@@ -499,19 +495,28 @@ func printReprocessPreview(out io.Writer, kinds []model.Kind, matched []int64, t
 	}
 }
 
-func runRefresh(ctx context.Context, kind model.Kind, ids []string) {
+func runRefresh(ctx context.Context, args []string) {
 	defer db.Init(ctx)()
 	ds, ctx := getAdminContext(ctx)
 
-	if failed := refreshItems(ctx, ds, kind, ids, os.Stdout); failed > 0 {
-		log.Fatal(ctx, "Failed to refresh artwork", "kind", kind, "failed", failed, "total", len(ids))
+	targets, failures, err := resolveArtworkTargets(ctx, ds, args, artwork.RefreshableKinds)
+	if err != nil {
+		log.Fatal(ctx, err)
+	}
+	for _, f := range failures {
+		log.Error(ctx, "Skipping unresolved item", f)
+	}
+	failed := refreshItems(ctx, ds, targets, os.Stdout) + len(failures)
+	if failed > 0 {
+		log.Fatal(ctx, "Failed to refresh artwork", "failed", failed, "total", len(targets)+len(failures))
 	}
 }
 
-// refreshItems keeps going after a failure — the ids are independent — and returns how many failed.
-func refreshItems(ctx context.Context, ds model.DataStore, kind model.Kind, ids []string, out io.Writer) int {
+// refreshItems keeps going after a failure — the items are independent — and returns how many failed.
+func refreshItems(ctx context.Context, ds model.DataStore, targets []model.ArtworkID, out io.Writer) int {
 	var failed int
-	for _, id := range ids {
+	for _, t := range targets {
+		kind, id := t.Kind, t.ID
 		// artwork.Refresh would happily queue an id that does not exist, orphaning a queue row.
 		if _, err := artworkItemName(ctx, ds, kind, id); err != nil {
 			log.Error(ctx, "Item not found", "kind", kind, "id", id, err)
@@ -544,7 +549,56 @@ func parseArtworkKind(s string, valid []model.Kind) (model.Kind, error) {
 	if ok && slices.Contains(valid, kind) {
 		return kind, nil
 	}
-	return kind, fmt.Errorf("invalid kind %q, expected one of: %s", s, kindPrefixes(valid))
+	return kind, invalidKindErr(s, valid)
+}
+
+func invalidKindErr(s string, valid []model.Kind) error {
+	return fmt.Errorf("invalid kind %q, expected one of: %s", s, kindPrefixes(valid))
+}
+
+// resolveArtworkTargets resolves explain/refresh positional args into artwork ids, accepting a
+// shared "<kind> <id>..." leader or self-describing args (a bare id, or a full artwork id). A
+// self-describing arg that cannot be resolved is returned as a failure rather than aborting the
+// batch, so refresh can process the resolvable ids; a malformed <kind> leader is a usage error.
+func resolveArtworkTargets(ctx context.Context, ds model.DataStore, args []string, valid []model.Kind) ([]model.ArtworkID, []error, error) {
+	if kind, ok := model.ParseKind(args[0]); ok && len(args) > 1 {
+		if !slices.Contains(valid, kind) {
+			return nil, nil, invalidKindErr(args[0], valid)
+		}
+		return slice.Map(args[1:], func(id string) model.ArtworkID {
+			return model.ArtworkID{Kind: kind, ID: id}
+		}), nil, nil
+	}
+	var targets []model.ArtworkID
+	var failures []error
+	for _, arg := range args {
+		target, err := artworkKindAndID(ctx, ds, arg)
+		if err == nil && !slices.Contains(valid, target.Kind) {
+			err = invalidKindErr(target.Kind.Prefix(), valid)
+		}
+		if err != nil {
+			failures = append(failures, err)
+			continue
+		}
+		targets = append(targets, target)
+	}
+	return targets, failures, nil
+}
+
+// artworkKindAndID resolves one self-describing argument: a full artwork id (al-<id>) takes its kind
+// from the prefix, a bare id is looked up. Entity ids never start with "<kind>-", so no collision.
+func artworkKindAndID(ctx context.Context, ds model.DataStore, arg string) (model.ArtworkID, error) {
+	if artID, err := model.ParseArtworkID(arg); err == nil && artID.ID != "" {
+		return model.ArtworkID{Kind: artID.Kind, ID: artID.ID}, nil
+	}
+	kind, err := model.GetEntityKindByID(ctx, ds, arg)
+	if errors.Is(err, model.ErrNotFound) {
+		return model.ArtworkID{}, fmt.Errorf("could not determine kind for %q; pass an explicit <kind>", arg)
+	}
+	if err != nil {
+		return model.ArtworkID{}, err
+	}
+	return model.ArtworkID{Kind: kind, ID: arg}, nil
 }
 
 // explainAgents accounts for every configured agent: one the CLI cannot construct (a plugin, or a
@@ -721,10 +775,22 @@ func formatTime(t time.Time) string {
 	return t.Format(time.RFC3339)
 }
 
-func runExplain(ctx context.Context, kind model.Kind, id string) {
+func runExplain(ctx context.Context, args []string) {
 	defer db.Init(ctx)()
 	ds, ctx := getAdminContext(ctx)
 
+	targets, failures, err := resolveArtworkTargets(ctx, ds, args, explainKinds)
+	if err != nil {
+		log.Fatal(ctx, err)
+	}
+	if len(failures) > 0 {
+		log.Fatal(ctx, failures[0])
+	}
+	if len(targets) != 1 {
+		log.Fatal(ctx, "explain takes a single item; pass one id or a <kind> <id> pair")
+	}
+	kind, id := targets[0].Kind, targets[0].ID
+
 	name, err := artworkItemName(ctx, ds, kind, id)
 	if err != nil {
 		log.Fatal(ctx, "Item not found", "kind", kind, "id", id, err)
diff --git a/cmd/artwork_test.go b/cmd/artwork_test.go
index b28d8dac5..8b50ba775 100644
--- a/cmd/artwork_test.go
+++ b/cmd/artwork_test.go
@@ -54,6 +54,74 @@ var _ = Describe("parseArtworkKind", func() {
 	})
 })
 
+var _ = Describe("resolveArtworkTargets", func() {
+	var ds *tests.MockDataStore
+	ctx := context.Background()
+
+	BeforeEach(func() {
+		artists := tests.CreateMockArtistRepo()
+		artists.SetData(model.Artists{{ID: "artist1"}})
+		ds = &tests.MockDataStore{MockedArtist: artists}
+	})
+
+	It("accepts the explicit <kind> <id> leader shared by every id", func() {
+		targets, failures, err := resolveArtworkTargets(ctx, ds, []string{"al", "x", "y"}, explainKinds)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(failures).To(BeEmpty())
+		Expect(targets).To(Equal([]model.ArtworkID{
+			{Kind: model.KindAlbumArtwork, ID: "x"}, {Kind: model.KindAlbumArtwork, ID: "y"}}))
+	})
+
+	It("rejects an explicit kind the command does not accept as a usage error", func() {
+		_, _, err := resolveArtworkTargets(ctx, ds, []string{"dc", "x"}, artwork.RefreshableKinds)
+		Expect(err).To(MatchError(ContainSubstring("invalid kind")))
+	})
+
+	It("resolves a bare id by looking it up across tables", func() {
+		targets, failures, err := resolveArtworkTargets(ctx, ds, []string{"artist1"}, explainKinds)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(failures).To(BeEmpty())
+		Expect(targets).To(Equal([]model.ArtworkID{{Kind: model.KindArtistArtwork, ID: "artist1"}}))
+	})
+
+	It("reads the kind from a full artwork id prefix without a database lookup", func() {
+		targets, _, err := resolveArtworkTargets(ctx, ds, []string{"al-realalbum"}, explainKinds)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(targets).To(Equal([]model.ArtworkID{{Kind: model.KindAlbumArtwork, ID: "realalbum"}}))
+	})
+
+	It("strips the hash suffix from a full artwork id", func() {
+		targets, _, err := resolveArtworkTargets(ctx, ds, []string{"al-realalbum_0123456789abcdef"}, explainKinds)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(targets).To(Equal([]model.ArtworkID{{Kind: model.KindAlbumArtwork, ID: "realalbum"}}))
+	})
+
+	It("collects a self-describing arg whose kind the command does not accept", func() {
+		targets, failures, err := resolveArtworkTargets(ctx, ds, []string{"dc-realalbum:2"}, artwork.RefreshableKinds)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(targets).To(BeEmpty())
+		Expect(failures).To(HaveLen(1))
+		Expect(failures[0]).To(MatchError(ContainSubstring("invalid kind")))
+	})
+
+	It("collects an id that matches nothing and has no kind prefix", func() {
+		targets, failures, err := resolveArtworkTargets(ctx, ds, []string{"nope"}, explainKinds)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(targets).To(BeEmpty())
+		Expect(failures).To(HaveLen(1))
+		Expect(failures[0]).To(MatchError(ContainSubstring("could not determine kind")))
+	})
+
+	It("resolves the valid ids and collects the unresolvable ones", func() {
+		targets, failures, err := resolveArtworkTargets(ctx, ds, []string{"artist1", "nope", "al-realalbum"}, explainKinds)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(targets).To(Equal([]model.ArtworkID{
+			{Kind: model.KindArtistArtwork, ID: "artist1"}, {Kind: model.KindAlbumArtwork, ID: "realalbum"}}))
+		Expect(failures).To(HaveLen(1))
+		Expect(failures[0]).To(MatchError(ContainSubstring("could not determine kind")))
+	})
+})
+
 var _ = Describe("explainResult", func() {
 	It("reports the winning source", func() {
 		steps := []artwork.TraceStep{{Candidate: "folder", Outcome: "hit", Detail: "/music/a.jpg"}}
@@ -337,10 +405,10 @@ var _ = Describe("discArtworkName", func() {
 })
 
 var _ = Describe("artwork refresh command", func() {
-	It("requires at least a kind and one id", func() {
-		Expect(artworkRefreshCmd.Args(artworkRefreshCmd, []string{"ar"})).To(HaveOccurred())
+	It("requires at least one argument", func() {
+		Expect(artworkRefreshCmd.Args(artworkRefreshCmd, []string{})).To(HaveOccurred())
+		Expect(artworkRefreshCmd.Args(artworkRefreshCmd, []string{"id1"})).ToNot(HaveOccurred())
 		Expect(artworkRefreshCmd.Args(artworkRefreshCmd, []string{"ar", "id1"})).ToNot(HaveOccurred())
-		Expect(artworkRefreshCmd.Args(artworkRefreshCmd, []string{"ar", "id1", "id2"})).ToNot(HaveOccurred())
 	})
 })
 
@@ -873,7 +941,8 @@ var _ = Describe("refreshItems", func() {
 		Expect(art.PutItemArtwork(&model.ItemArtwork{ItemKind: model.KindAlbumArtwork.Prefix(),
 			ItemID: "al-1", ImageType: model.ImageTypePrimary, Hash: "abc123"})).To(Succeed())
 
-		Expect(refreshItems(ctx, ds, model.KindAlbumArtwork, []string{"al-1", "al-3"}, &out)).To(BeZero())
+		Expect(refreshItems(ctx, ds, []model.ArtworkID{
+			{Kind: model.KindAlbumArtwork, ID: "al-1"}, {Kind: model.KindAlbumArtwork, ID: "al-3"}}, &out)).To(BeZero())
 
 		_, err := art.GetItemArtwork(model.KindAlbumArtwork, "al-1", model.ImageTypePrimary)
 		Expect(err).To(MatchError(model.ErrNotFound))
@@ -884,7 +953,7 @@ var _ = Describe("refreshItems", func() {
 	})
 
 	It("skips an id that does not exist instead of queuing it", func() {
-		Expect(refreshItems(ctx, ds, model.KindAlbumArtwork, []string{"al-2"}, &out)).To(Equal(1))
+		Expect(refreshItems(ctx, ds, []model.ArtworkID{{Kind: model.KindAlbumArtwork, ID: "al-2"}}, &out)).To(Equal(1))
 
 		_, err := queue.Get(model.KindAlbumArtwork, "al-2", model.ImageTypePrimary)
 		Expect(err).To(MatchError(model.ErrNotFound), "a typo must not leave an orphan queue row")
@@ -892,8 +961,8 @@ var _ = Describe("refreshItems", func() {
 	})
 
 	It("continues past a failing id and counts the failures", func() {
-		Expect(refreshItems(ctx, ds, model.KindAlbumArtwork,
-			[]string{"al-1", "al-2", "al-3"}, &out)).To(Equal(1))
+		Expect(refreshItems(ctx, ds, []model.ArtworkID{{Kind: model.KindAlbumArtwork, ID: "al-1"},
+			{Kind: model.KindAlbumArtwork, ID: "al-2"}, {Kind: model.KindAlbumArtwork, ID: "al-3"}}, &out)).To(Equal(1))
 
 		Expect(out.String()).To(Equal("al/al-1: queued\nal/al-3: queued\n"),
 			"the ids after a failure are still refreshed")
diff --git a/core/artwork/blurhash/blurhash.go b/core/artwork/blurhash/blurhash.go
index ca5bf7026..29e1ccfda 100644
--- a/core/artwork/blurhash/blurhash.go
+++ b/core/artwork/blurhash/blurhash.go
@@ -52,6 +52,12 @@ func Encode(img image.Image) (string, error) {
 
 	lin := srgbToLinearTable()
 	factors := make([][3]float64, xComp*yComp)
+	linR := make([]float64, w)
+	linG := make([]float64, w)
+	linB := make([]float64, w)
+	rowR := make([]float64, xComp)
+	rowG := make([]float64, xComp)
+	rowB := make([]float64, xComp)
 	for y := range h {
 		row := src.pix[y*src.stride:]
 		for x := range w {
@@ -60,15 +66,26 @@ func Encode(img image.Image) (string, error) {
 			if src.straight {
 				r, g, b = premultiply(r, g, b, row[p+3])
 			}
-			lr, lg, lb := lin[r], lin[g], lin[b]
-			for j := range yComp {
-				for i := range xComp {
-					basis := cosX[i][x] * cosY[j][y]
-					f := &factors[j*xComp+i]
-					f[0] += basis * lr
-					f[1] += basis * lg
-					f[2] += basis * lb
-				}
+			linR[x], linG[x], linB[x] = lin[r], lin[g], lin[b]
+		}
+		// The basis is separable, so a row costs xComp dot products plus one fold over yComp,
+		// rather than xComp*yComp multiply-accumulates per pixel.
+		for i := range xComp {
+			var sr, sg, sb float64
+			for x, c := range cosX[i] {
+				sr += c * linR[x]
+				sg += c * linG[x]
+				sb += c * linB[x]
+			}
+			rowR[i], rowG[i], rowB[i] = sr, sg, sb
+		}
+		for j := range yComp {
+			cy := cosY[j][y]
+			for i := range xComp {
+				f := &factors[j*xComp+i]
+				f[0] += cy * rowR[i]
+				f[1] += cy * rowG[i]
+				f[2] += cy * rowB[i]
 			}
 		}
 	}
diff --git a/core/artwork/e2e/acquire_serve_test.go b/core/artwork/e2e/acquire_serve_test.go
index 0a9363b5d..34dfb2cac 100644
--- a/core/artwork/e2e/acquire_serve_test.go
+++ b/core/artwork/e2e/acquire_serve_test.go
@@ -106,7 +106,7 @@ var _ = Describe("Acquisition → serve loop", func() {
 			func(context.Context, cache.Item) (io.Reader, error) {
 				return nil, errors.New("resize not exercised in e2e")
 			})
-		Eventually(func() bool { return imgCache.Available(ctx) }).Should(BeTrue())
+		Eventually(func() bool { return imgCache.Available(ctx) }, 10*time.Second).Should(BeTrue())
 
 		svc = artwork.NewArtwork(ds, imgCache, store, ffm)
 		worker = artwork.NewWorker(ds, store, agents.GetAgents(ds, nil), ffm, events.NoopBroker(), imgCache)
diff --git a/core/artwork/e2e/resolution_harness_test.go b/core/artwork/e2e/resolution_harness_test.go
index 1168393df..fff62ce69 100644
--- a/core/artwork/e2e/resolution_harness_test.go
+++ b/core/artwork/e2e/resolution_harness_test.go
@@ -117,7 +117,7 @@ func setupResolutionHarness() {
 		func(context.Context, cache.Item) (io.Reader, error) {
 			return nil, fmt.Errorf("resize not exercised in e2e")
 		})
-	Eventually(func() bool { return imgCache.Available(rctx) }).Should(BeTrue())
+	Eventually(func() bool { return imgCache.Available(rctx) }, 10*time.Second).Should(BeTrue())
 
 	rsvc = artwork.NewArtwork(rds, imgCache, rstore, ffm)
 	rworker = artwork.NewWorker(rds, rstore, agents.GetAgents(rds, nil), ffm, events.NoopBroker(), imgCache)
diff --git a/core/artwork/housekeeping.go b/core/artwork/housekeeping.go
index ae1fc0a0d..f2996d044 100644
--- a/core/artwork/housekeeping.go
+++ b/core/artwork/housekeeping.go
@@ -2,8 +2,6 @@ package artwork
 
 import (
 	"context"
-	"crypto/md5"
-	"encoding/hex"
 	"fmt"
 	"slices"
 	"strconv"
@@ -16,6 +14,7 @@ import (
 	"github.com/navidrome/navidrome/log"
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/utils/slice"
+	"github.com/zeebo/xxh3"
 )
 
 // StaleAbsentAge is how long an absent state is trusted before a recheck retries it.
@@ -66,8 +65,7 @@ func FingerprintInputs() []FingerprintInput {
 func ConfigFingerprint() string {
 	values := slice.Map(FingerprintInputs(), func(i FingerprintInput) string { return i.Value })
 	raw := fmt.Sprintf("%s|%d", strings.Join(values, "|"), artworkEpoch)
-	sum := md5.Sum([]byte(raw)) //nolint:gosec // fingerprint, not security-sensitive
-	return hex.EncodeToString(sum[:])
+	return fmt.Sprintf("%016x", xxh3.Hash([]byte(raw)))
 }
 
 // backfill enqueues artwork resolution for every entity when the config fingerprint changed.
diff --git a/core/artwork/housekeeping_test.go b/core/artwork/housekeeping_test.go
index 32a7688b4..4ea15ab04 100644
--- a/core/artwork/housekeeping_test.go
+++ b/core/artwork/housekeeping_test.go
@@ -135,7 +135,7 @@ var _ = Describe("Housekeeping", func() {
 			conf.Server.EnableExternalServices = true
 			conf.Server.EnableM3UExternalAlbumArt = false
 
-			Expect(ConfigFingerprint()).To(Equal("7e537a22febc07d3d5ca40546e88da54"))
+			Expect(ConfigFingerprint()).To(Equal("7b538a83a870c16d"))
 		})
 
 		It("reports the config inputs it hashes, so a change can be traced to a setting", func() {
diff --git a/core/common_test.go b/core/common_test.go
index 0d6e3a299..f57ea8d38 100644
--- a/core/common_test.go
+++ b/core/common_test.go
@@ -2,6 +2,7 @@ package core
 
 import (
 	"context"
+	"path/filepath"
 
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
@@ -41,10 +42,9 @@ var _ = Describe("common.go", func() {
 		})
 
 		It("returns the absolute path when library exists", func() {
-			tests.SkipOnWindows("path separator bug (#TBD-path-sep-core)")
 			ctx := context.Background()
 			abs := AbsolutePath(ctx, ds, libId, path)
-			Expect(abs).To(Equal("/library/root/music/file.mp3"))
+			Expect(abs).To(Equal(filepath.FromSlash("/library/root/music/file.mp3")))
 		})
 
 		It("returns the original path if library not found", func() {
diff --git a/core/playlists/playlists.go b/core/playlists/playlists.go
index 656bde05e..9ae8f09cb 100644
--- a/core/playlists/playlists.go
+++ b/core/playlists/playlists.go
@@ -130,12 +130,13 @@ func (s *playlists) Create(ctx context.Context, playlistId string, name string,
 			if err != nil {
 				return err
 			}
-			if pls.IsSmartPlaylist() {
-				return model.ErrNotAuthorized
-			}
+			// Ownership first: a non-owner must get ErrNotAuthorized, not a read-only conflict.
 			if !usr.IsAdmin && pls.OwnerID != usr.ID {
 				return model.ErrNotAuthorized
 			}
+			if !pls.TracksEditable() {
+				return model.ErrPlaylistNotEditable
+			}
 		} else {
 			pls = &model.Playlist{Name: name}
 			pls.OwnerID = usr.ID
@@ -230,14 +231,14 @@ func (s *playlists) checkWritable(ctx context.Context, id string) (*model.Playli
 	return pls, nil
 }
 
-// checkTracksEditable verifies the user can modify tracks (ownership + not smart playlist).
+// checkTracksEditable verifies the user owns the playlist and its tracks are editable.
 func (s *playlists) checkTracksEditable(ctx context.Context, playlistID string) (*model.Playlist, error) {
 	pls, err := s.checkWritable(ctx, playlistID)
 	if err != nil {
 		return nil, err
 	}
-	if pls.IsSmartPlaylist() {
-		return nil, model.ErrNotAuthorized
+	if !pls.TracksEditable() {
+		return nil, model.ErrPlaylistNotEditable
 	}
 	return pls, nil
 }
diff --git a/core/playlists/playlists_test.go b/core/playlists/playlists_test.go
index e8134b2ef..dd182b3f1 100644
--- a/core/playlists/playlists_test.go
+++ b/core/playlists/playlists_test.go
@@ -102,6 +102,8 @@ var _ = Describe("Playlists", func() {
 				"pls-2": {ID: "pls-2", Name: "Other's", OwnerID: "other-user"},
 				"pls-smart": {ID: "pls-smart", Name: "Smart", OwnerID: "user-1",
 					Rules: &criteria.Criteria{Expression: criteria.Contains{"title": "test"}}},
+				"pls-synced":       {ID: "pls-synced", Name: "Synced", OwnerID: "user-1", Sync: true},
+				"pls-synced-other": {ID: "pls-synced-other", Name: "Other's Synced", OwnerID: "other-user", Sync: true, Public: true},
 			}
 			ps = playlists.NewPlaylists(ds, artwork.NewUploader(ds))
 		})
@@ -145,6 +147,18 @@ var _ = Describe("Playlists", func() {
 		It("denies replacing tracks on a smart playlist", func() {
 			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
 			_, err := ps.Create(ctx, "pls-smart", "", []string{"song-1"})
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
+		})
+
+		It("denies replacing tracks on a synced playlist", func() {
+			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
+			_, err := ps.Create(ctx, "pls-synced", "", []string{"song-1"})
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
+		})
+
+		It("denies a non-owner with authorization, not a conflict, on a public synced playlist", func() {
+			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
+			_, err := ps.Create(ctx, "pls-synced-other", "", []string{"song-1"})
 			Expect(err).To(MatchError(model.ErrNotAuthorized))
 		})
 	})
@@ -159,6 +173,7 @@ var _ = Describe("Playlists", func() {
 				"pls-other": {ID: "pls-other", Name: "Other's", OwnerID: "other-user"},
 				"pls-smart": {ID: "pls-smart", Name: "Smart", OwnerID: "user-1",
 					Rules: &criteria.Criteria{Expression: criteria.Contains{"title": "test"}}},
+				"pls-synced": {ID: "pls-synced", Name: "Synced", OwnerID: "user-1", Sync: true},
 			}
 			mockPlsRepo.TracksRepo = mockTracks
 			ps = playlists.NewPlaylists(ds, artwork.NewUploader(ds))
@@ -191,13 +206,13 @@ var _ = Describe("Playlists", func() {
 		It("denies adding tracks to a smart playlist", func() {
 			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
 			err := ps.Update(ctx, "pls-smart", nil, nil, nil, []string{"song-1"}, nil)
-			Expect(err).To(MatchError(model.ErrNotAuthorized))
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
 		})
 
 		It("denies removing tracks from a smart playlist", func() {
 			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
 			err := ps.Update(ctx, "pls-smart", nil, nil, nil, nil, []int{0})
-			Expect(err).To(MatchError(model.ErrNotAuthorized))
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
 		})
 
 		It("allows metadata updates on a smart playlist", func() {
@@ -205,6 +220,18 @@ var _ = Describe("Playlists", func() {
 			err := ps.Update(ctx, "pls-smart", new("Updated Smart"), nil, nil, nil, nil)
 			Expect(err).ToNot(HaveOccurred())
 		})
+
+		It("denies adding tracks to a synced playlist", func() {
+			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
+			err := ps.Update(ctx, "pls-synced", nil, nil, nil, []string{"song-1"}, nil)
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
+		})
+
+		It("allows metadata updates on a synced playlist", func() {
+			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
+			err := ps.Update(ctx, "pls-synced", new("Renamed Synced"), nil, nil, nil, nil)
+			Expect(err).ToNot(HaveOccurred())
+		})
 	})
 
 	Describe("AddTracks", func() {
@@ -216,7 +243,8 @@ var _ = Describe("Playlists", func() {
 				"pls-1": {ID: "pls-1", Name: "My Playlist", OwnerID: "user-1"},
 				"pls-smart": {ID: "pls-smart", Name: "Smart", OwnerID: "user-1",
 					Rules: &criteria.Criteria{Expression: criteria.Contains{"title": "test"}}},
-				"pls-other": {ID: "pls-other", Name: "Other's", OwnerID: "other-user"},
+				"pls-other":  {ID: "pls-other", Name: "Other's", OwnerID: "other-user"},
+				"pls-synced": {ID: "pls-synced", Name: "Synced", OwnerID: "user-1", Sync: true},
 			}
 			mockPlsRepo.TracksRepo = mockTracks
 			ps = playlists.NewPlaylists(ds, artwork.NewUploader(ds))
@@ -246,7 +274,13 @@ var _ = Describe("Playlists", func() {
 		It("denies editing smart playlists", func() {
 			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
 			_, err := ps.AddTracks(ctx, "pls-smart", []string{"song-1"})
-			Expect(err).To(MatchError(model.ErrNotAuthorized))
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
+		})
+
+		It("denies editing synced playlists", func() {
+			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
+			_, err := ps.AddTracks(ctx, "pls-synced", []string{"song-1"})
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
 		})
 
 		It("returns error when playlist not found", func() {
@@ -280,7 +314,7 @@ var _ = Describe("Playlists", func() {
 		It("denies on smart playlist", func() {
 			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
 			err := ps.RemoveTracks(ctx, "pls-smart", []string{"track-1"})
-			Expect(err).To(MatchError(model.ErrNotAuthorized))
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
 		})
 
 		It("denies non-owner", func() {
@@ -314,7 +348,7 @@ var _ = Describe("Playlists", func() {
 		It("denies on smart playlist", func() {
 			ctx = request.WithUser(ctx, model.User{ID: "user-1", IsAdmin: false})
 			err := ps.ReorderTrack(ctx, "pls-smart", 1, 3)
-			Expect(err).To(MatchError(model.ErrNotAuthorized))
+			Expect(err).To(MatchError(model.ErrPlaylistNotEditable))
 		})
 	})
 
diff --git a/core/storage/storage_test.go b/core/storage/storage_test.go
index 336b5a7a9..03904d086 100644
--- a/core/storage/storage_test.go
+++ b/core/storage/storage_test.go
@@ -7,7 +7,6 @@ import (
 	"runtime"
 	"testing"
 
-	"github.com/navidrome/navidrome/tests"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
@@ -56,13 +55,16 @@ var _ = Describe("Storage", func() {
 			Expect(s.(*fakeLocalStorage).u.Path).To(Equal("/tmp"))
 		})
 		It("should return a file implementation for a relative folder", func() {
-			tests.SkipOnWindows("path separator bug (#TBD-path-sep-storage)")
 			s, err := For("tmp")
 			Expect(err).ToNot(HaveOccurred())
 			cwd, _ := os.Getwd()
 			Expect(s).To(BeAssignableToTypeOf(&fakeLocalStorage{}))
-			Expect(s.(*fakeLocalStorage).u.Scheme).To(Equal("file"))
-			Expect(s.(*fakeLocalStorage).u.Path).To(Equal(filepath.Join(cwd, "tmp")))
+			u := s.(*fakeLocalStorage).u
+			Expect(u.Scheme).To(Equal("file"))
+			// On Windows the drive letter lands in u.Host, so re-join it with
+			// u.Path (as newLocalStorage does) to keep the assertion OS-independent.
+			got := filepath.Join(u.Host, filepath.FromSlash(u.Path))
+			Expect(got).To(Equal(filepath.Join(cwd, "tmp")))
 		})
 		It("should return error if schema is unregistered", func() {
 			_, err := For("webdav:///tmp")
diff --git a/core/stream/media_streamer_test.go b/core/stream/media_streamer_test.go
index f5ca16d3f..fb1c59a60 100644
--- a/core/stream/media_streamer_test.go
+++ b/core/stream/media_streamer_test.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"io"
 	"os"
+	"time"
 
 	"github.com/navidrome/navidrome/conf"
 	"github.com/navidrome/navidrome/conf/configtest"
@@ -33,7 +34,7 @@ var _ = Describe("MediaStreamer", func() {
 			{ID: "123", Path: "tests/fixtures/test.mp3", Suffix: "mp3", BitRate: 128, Duration: 257.0},
 		})
 		testCache := stream.NewTranscodingCache()
-		Eventually(func() bool { return testCache.Available(context.TODO()) }).Should(BeTrue())
+		Eventually(func() bool { return testCache.Available(context.TODO()) }, 10*time.Second).Should(BeTrue())
 		streamer = stream.NewMediaStreamer(ds, ffmpeg, testCache)
 	})
 	AfterEach(func() {
@@ -75,7 +76,7 @@ var _ = Describe("MediaStreamer", func() {
 			conf.Server.Transcoding.MaxConcurrent = 1
 			conf.Server.Transcoding.MaxConcurrentPerUser = 0
 			tightCache := stream.NewTranscodingCache()
-			Eventually(func() bool { return tightCache.Available(context.TODO()) }).Should(BeTrue())
+			Eventually(func() bool { return tightCache.Available(context.TODO()) }, 10*time.Second).Should(BeTrue())
 			tightStreamer := stream.NewMediaStreamer(ds, blockingFFmpeg, tightCache)
 
 			userCtx := request.WithUsername(ctx, "alice")
@@ -92,7 +93,7 @@ var _ = Describe("MediaStreamer", func() {
 			conf.Server.Transcoding.MaxConcurrent = 1
 			conf.Server.Transcoding.MaxConcurrentPerUser = 0
 			tightCache := stream.NewTranscodingCache()
-			Eventually(func() bool { return tightCache.Available(context.TODO()) }).Should(BeTrue())
+			Eventually(func() bool { return tightCache.Available(context.TODO()) }, 10*time.Second).Should(BeTrue())
 			tightStreamer := stream.NewMediaStreamer(ds, ffmpeg, tightCache)
 
 			userCtx := request.WithUsername(ctx, "alice")
@@ -112,7 +113,7 @@ var _ = Describe("MediaStreamer", func() {
 			conf.Server.Transcoding.MaxConcurrent = 1
 			conf.Server.Transcoding.MaxConcurrentPerUser = 0
 			tightCache := stream.NewTranscodingCache()
-			Eventually(func() bool { return tightCache.Available(context.TODO()) }).Should(BeTrue())
+			Eventually(func() bool { return tightCache.Available(context.TODO()) }, 10*time.Second).Should(BeTrue())
 			tightStreamer := stream.NewMediaStreamer(ds, ffmpeg, tightCache)
 
 			userCtx := request.WithUsername(ctx, "alice")
diff --git a/model/errors.go b/model/errors.go
index 41029d316..9e56f9501 100644
--- a/model/errors.go
+++ b/model/errors.go
@@ -3,10 +3,11 @@ package model
 import "errors"
 
 var (
-	ErrNotFound      = errors.New("data not found")
-	ErrInvalidAuth   = errors.New("invalid authentication")
-	ErrNotAuthorized = errors.New("not authorized")
-	ErrExpired       = errors.New("access expired")
-	ErrNotAvailable  = errors.New("functionality not available")
-	ErrValidation    = errors.New("validation error")
+	ErrNotFound            = errors.New("data not found")
+	ErrInvalidAuth         = errors.New("invalid authentication")
+	ErrNotAuthorized       = errors.New("not authorized")
+	ErrExpired             = errors.New("access expired")
+	ErrNotAvailable        = errors.New("functionality not available")
+	ErrValidation          = errors.New("validation error")
+	ErrPlaylistNotEditable = errors.New("playlist tracks are not editable")
 )
diff --git a/model/get_entity.go b/model/get_entity.go
index 3e1a78d1d..e5d41f1be 100644
--- a/model/get_entity.go
+++ b/model/get_entity.go
@@ -7,21 +7,36 @@ import (
 
 // TODO: Should the type be encoded in the ID?
 func GetEntityByID(ctx context.Context, ds DataStore, id string) (any, error) {
-	getters := []func() (any, error){
-		func() (any, error) { return ds.Artist(ctx).Get(id) },
-		func() (any, error) { return ds.Album(ctx).Get(id) },
-		func() (any, error) { return ds.Playlist(ctx).Get(id) },
-		func() (any, error) { return ds.MediaFile(ctx).Get(id) },
-		func() (any, error) { return ds.Radio(ctx).Get(id) },
+	entity, _, err := getEntity(ctx, ds, id)
+	return entity, err
+}
+
+// GetEntityKindByID resolves a bare entity id to its artwork Kind, searching the same tables as
+// GetEntityByID. It reports ErrNotFound when no entity owns the id.
+func GetEntityKindByID(ctx context.Context, ds DataStore, id string) (Kind, error) {
+	_, kind, err := getEntity(ctx, ds, id)
+	return kind, err
+}
+
+func getEntity(ctx context.Context, ds DataStore, id string) (any, Kind, error) {
+	getters := []struct {
+		kind Kind
+		get  func() (any, error)
+	}{
+		{KindArtistArtwork, func() (any, error) { return ds.Artist(ctx).Get(id) }},
+		{KindAlbumArtwork, func() (any, error) { return ds.Album(ctx).Get(id) }},
+		{KindPlaylistArtwork, func() (any, error) { return ds.Playlist(ctx).Get(id) }},
+		{KindMediaFileArtwork, func() (any, error) { return ds.MediaFile(ctx).Get(id) }},
+		{KindRadioArtwork, func() (any, error) { return ds.Radio(ctx).Get(id) }},
 	}
-	for _, get := range getters {
-		entity, err := get()
+	for _, g := range getters {
+		entity, err := g.get()
 		if err == nil {
-			return entity, nil
+			return entity, g.kind, nil
 		}
 		if !errors.Is(err, ErrNotFound) {
-			return nil, err
+			return nil, Kind{}, err
 		}
 	}
-	return nil, ErrNotFound
+	return nil, Kind{}, ErrNotFound
 }
diff --git a/model/get_entity_test.go b/model/get_entity_test.go
index f8a4c9e8e..4e589406a 100644
--- a/model/get_entity_test.go
+++ b/model/get_entity_test.go
@@ -38,3 +38,25 @@ var _ = Describe("GetEntityByID", func() {
 		Expect(err).ToNot(MatchError(model.ErrNotFound))
 	})
 })
+
+var _ = Describe("GetEntityKindByID", func() {
+	var ds *tests.MockDataStore
+	var ctx context.Context
+
+	BeforeEach(func() {
+		ds = &tests.MockDataStore{}
+		ctx = GinkgoT().Context()
+	})
+
+	It("returns the artwork kind for the matching id", func() {
+		ds.Album(ctx).(*tests.MockAlbumRepo).SetData(model.Albums{{ID: "a1"}})
+		kind, err := model.GetEntityKindByID(ctx, ds, "a1")
+		Expect(err).ToNot(HaveOccurred())
+		Expect(kind).To(Equal(model.KindAlbumArtwork))
+	})
+
+	It("returns ErrNotFound when no entity matches", func() {
+		_, err := model.GetEntityKindByID(ctx, ds, "missing")
+		Expect(err).To(MatchError(model.ErrNotFound))
+	})
+})
diff --git a/model/mediafile.go b/model/mediafile.go
index f4e767272..99aee591e 100644
--- a/model/mediafile.go
+++ b/model/mediafile.go
@@ -2,7 +2,6 @@ package model
 
 import (
 	"cmp"
-	"crypto/md5"
 	"encoding/json"
 	"fmt"
 	"iter"
@@ -20,6 +19,7 @@ import (
 	"github.com/navidrome/navidrome/utils/gg"
 	"github.com/navidrome/navidrome/utils/number"
 	"github.com/navidrome/navidrome/utils/slice"
+	"github.com/zeebo/xxh3"
 )
 
 type MediaFile struct {
@@ -232,7 +232,7 @@ func (mf MediaFile) Hash() string {
 		ZeroNil:         true,
 	}
 	hash, _ := hashstructure.Hash(mf, opts)
-	sum := md5.New()
+	sum := xxh3.New()
 	sum.Write(fmt.Appendf(nil, "%d", hash))
 	sum.Write(mf.Tags.Hash())
 	sum.Write(mf.Participants.Hash())
diff --git a/model/mediafile_test.go b/model/mediafile_test.go
index 3f306f1a7..097e3ca54 100644
--- a/model/mediafile_test.go
+++ b/model/mediafile_test.go
@@ -715,14 +715,10 @@ var _ = Describe("MediaFile.Movements", func() {
 })
 
 var _ = Describe("MediaFile.Hash", func() {
-	// Guards the upgrade guarantee: converting BPM/BitDepth from int to *int must not change hashes,
-	// or every file would be spuriously re-imported on the next scan.
-	// Golden hashes were captured at 46221d516 when those fields were plain ints.
-	It("keeps hashes identical to the pre-pointer-conversion values", func() {
-		// Golden hashes computed at 46221d516, when BPM/BitDepth were plain ints — pinning
-		// them guarantees the pointer conversion cannot trigger a full-library re-import.
-		Expect(MediaFile{Title: "Song"}.Hash()).To(Equal("1d856ced42cb96db39e354a4bac9a622"))
-		Expect(MediaFile{Title: "Song", BPM: new(120), BitDepth: new(16)}.Hash()).To(Equal("b2b0b1d1dd7fd767093588e4af3a0689"))
+	// Pins the hash formula: an accidental change spuriously re-imports every file on the next scan.
+	It("hashes to a stable value", func() {
+		Expect(MediaFile{Title: "Song"}.Hash()).To(Equal("05fdf70bb0cbe090"))
+		Expect(MediaFile{Title: "Song", BPM: new(120), BitDepth: new(16)}.Hash()).To(Equal("b5daf6ac1009a538"))
 	})
 	It("changes the hash when a pointer field has a value", func() {
 		base := MediaFile{Title: "Song"}
diff --git a/model/participants.go b/model/participants.go
index afbda10de..b5390d22c 100644
--- a/model/participants.go
+++ b/model/participants.go
@@ -2,12 +2,12 @@ package model
 
 import (
 	"cmp"
-	"crypto/md5"
 	"fmt"
 	"slices"
 	"strings"
 
 	"github.com/navidrome/navidrome/utils/slice"
+	"github.com/zeebo/xxh3"
 )
 
 var (
@@ -193,7 +193,7 @@ func (p Participants) Hash() []byte {
 		flattened = append(flattened, role.String()+":"+strings.Join(ids, "/"))
 	}
 	slices.Sort(flattened)
-	sum := md5.New()
+	sum := xxh3.New()
 	sum.Write([]byte(strings.Join(flattened, "|")))
 	return sum.Sum(nil)
 }
diff --git a/model/playlist.go b/model/playlist.go
index 55b94a640..306401271 100644
--- a/model/playlist.go
+++ b/model/playlist.go
@@ -42,6 +42,11 @@ func (pls Playlist) IsSmartPlaylist() bool {
 	return pls.Rules != nil && pls.Rules.Expression != nil
 }
 
+// TracksEditable reports whether the track list is user-owned rather than server-managed.
+func (pls Playlist) TracksEditable() bool {
+	return !pls.IsSmartPlaylist() && !pls.Sync
+}
+
 // RefreshDelay returns the playlist's own refresh window when set, falling
 // back to the global SmartPlaylistRefreshDelay.
 func (pls Playlist) RefreshDelay() time.Duration {
diff --git a/model/playlist_test.go b/model/playlist_test.go
index d936129ce..d98c85716 100644
--- a/model/playlist_test.go
+++ b/model/playlist_test.go
@@ -73,4 +73,19 @@ var _ = Describe("Playlist", func() {
 			Expect(pls.RefreshDelay()).To(Equal(5 * time.Second))
 		})
 	})
+
+	Describe("TracksEditable", func() {
+		It("is true for a plain playlist", func() {
+			Expect(model.Playlist{}.TracksEditable()).To(BeTrue())
+		})
+
+		It("is false for a smart playlist", func() {
+			pls := model.Playlist{Rules: &criteria.Criteria{Expression: criteria.Is{"loved": true}}}
+			Expect(pls.TracksEditable()).To(BeFalse())
+		})
+
+		It("is false for a synced playlist", func() {
+			Expect(model.Playlist{Sync: true}.TracksEditable()).To(BeFalse())
+		})
+	})
 })
diff --git a/model/tag.go b/model/tag.go
index 1bc011495..bb4fce181 100644
--- a/model/tag.go
+++ b/model/tag.go
@@ -2,13 +2,13 @@ package model
 
 import (
 	"cmp"
-	"crypto/md5"
 	"fmt"
 	"slices"
 	"strings"
 
 	"github.com/navidrome/navidrome/model/id"
 	"github.com/navidrome/navidrome/utils/slice"
+	"github.com/zeebo/xxh3"
 )
 
 type Tag struct {
@@ -117,7 +117,7 @@ func (t Tags) Hash() []byte {
 	}
 	ids := t.IDs()
 	slices.Sort(ids)
-	sum := md5.New()
+	sum := xxh3.New()
 	sum.Write([]byte(strings.Join(ids, "|")))
 	return sum.Sum(nil)
 }
diff --git a/persistence/folder_repository_test.go b/persistence/folder_repository_test.go
index b429cecb9..545d8ad49 100644
--- a/persistence/folder_repository_test.go
+++ b/persistence/folder_repository_test.go
@@ -8,7 +8,6 @@ import (
 	"github.com/navidrome/navidrome/log"
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/model/request"
-	"github.com/navidrome/navidrome/tests"
 	"github.com/navidrome/navidrome/utils/slice"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
@@ -137,7 +136,6 @@ var _ = Describe("FolderRepository", func() {
 			})
 
 			It("includes all child folders when querying parent", func() {
-				tests.SkipOnWindows("path storage (#TBD-path-sep-persistence)")
 				// Create a parent folder with multiple children
 				parent := model.NewFolder(testLib, "TestParent/Music")
 				child1 := model.NewFolder(testLib, "TestParent/Music/Rock/Queen")
@@ -159,7 +157,6 @@ var _ = Describe("FolderRepository", func() {
 			})
 
 			It("excludes children from other libraries", func() {
-				tests.SkipOnWindows("path storage (#TBD-path-sep-persistence)")
 				// Create parent in testLib
 				parent := model.NewFolder(testLib, "TestIsolation/Parent")
 				child := model.NewFolder(testLib, "TestIsolation/Parent/Child")
@@ -185,7 +182,6 @@ var _ = Describe("FolderRepository", func() {
 			})
 
 			It("excludes missing children when querying parent", func() {
-				tests.SkipOnWindows("path storage (#TBD-path-sep-persistence)")
 				// Create parent and children, mark one as missing
 				parent := model.NewFolder(testLib, "TestMissingChild/Parent")
 				child1 := model.NewFolder(testLib, "TestMissingChild/Parent/Child1")
@@ -206,7 +202,6 @@ var _ = Describe("FolderRepository", func() {
 			})
 
 			It("handles mix of existing and non-existing target paths", func() {
-				tests.SkipOnWindows("path storage (#TBD-path-sep-persistence)")
 				// Create folders for one path but not the other
 				existingParent := model.NewFolder(testLib, "TestMixed/Exists")
 				existingChild := model.NewFolder(testLib, "TestMixed/Exists/Child")
diff --git a/persistence/sql_base_repository.go b/persistence/sql_base_repository.go
index 428ba7a7b..d4cf9b456 100644
--- a/persistence/sql_base_repository.go
+++ b/persistence/sql_base_repository.go
@@ -2,7 +2,6 @@ package persistence
 
 import (
 	"context"
-	"crypto/md5"
 	"database/sql"
 	"errors"
 	"fmt"
@@ -23,6 +22,7 @@ import (
 	"github.com/navidrome/navidrome/utils/hasher"
 	"github.com/navidrome/navidrome/utils/slice"
 	"github.com/pocketbase/dbx"
+	"github.com/zeebo/xxh3"
 )
 
 // sqlRepository is the base repository for all SQL repositories. It provides common functions to interact with the DB.
@@ -97,6 +97,8 @@ func (r *sqlRepository) registerModel(instance any, filters map[string]filterFun
 }
 
 // setSortMappings sets the mappings for the sort fields. If the sort field is not in the map, it will be used as is.
+// This applies per comma-separated part, so a key added here also defines that bare name wherever a
+// caller uses it inside a sort list.
 //
 // If PreferSortTags is enabled, it will map the order fields to the corresponding sort expression,
 // which gives precedence to sort tags.
@@ -147,17 +149,37 @@ func (r sqlRepository) applyOptions(sq SelectBuilder, options ...model.QueryOpti
 
 // TODO Change all sortMappings to have a consistent case
 func (r sqlRepository) sortMapping(sort string) string {
-	if mapping, ok := r.sortMappings[sort]; ok {
+	if mapping, _, ok := r.lookupSortMapping(sort); ok {
 		return mapping
 	}
-	if mapping, ok := r.sortMappings[toCamelCase(sort)]; ok {
-		return mapping
+	// Each part of a comma list is resolved on its own, so a mix of mapped keys and plain columns
+	// keeps the mappings the recognized parts have.
+	parts := strings.FieldsFunc(sort, splitFunc(','))
+	mapped := make([]string, 0, len(parts))
+	for _, part := range parts {
+		part = strings.TrimSpace(part)
+		if partMapping, _, ok := r.lookupSortMapping(part); ok {
+			part = partMapping
+		} else {
+			part = toSnakeCase(part)
+		}
+		mapped = append(mapped, part)
 	}
-	sort = toSnakeCase(sort)
-	if mapping, ok := r.sortMappings[sort]; ok {
-		return mapping
+	return strings.Join(mapped, ", ")
+}
+
+// lookupSortMapping also returns the snake_case form when it had to derive one, so a caller's
+// fallback doesn't recompute it: toSnakeCase runs two regexps.
+func (r sqlRepository) lookupSortMapping(sort string) (mapping, snakeCased string, ok bool) {
+	if mapping, ok = r.sortMappings[sort]; ok {
+		return mapping, sort, true
 	}
-	return sort
+	if mapping, ok = r.sortMappings[toCamelCase(sort)]; ok {
+		return mapping, "", true
+	}
+	snakeCased = toSnakeCase(sort)
+	mapping, ok = r.sortMappings[snakeCased]
+	return mapping, snakeCased, ok
 }
 
 func (r sqlRepository) buildSortOrder(sort, order string) string {
@@ -276,8 +298,8 @@ func (r sqlRepository) visibleLibraryIDs() ([]int, error) {
 func (r sqlRepository) seedKey() string {
 	// Seed keys must be all lowercase, or else SQLite3 will encode it, making it not match the seed
 	// used in the query. Hashing the user ID and converting it to a hex string will do the trick
-	userIDHash := md5.Sum([]byte(loggedUser(r.ctx).ID))
-	return fmt.Sprintf("%s|%x", r.tableName, userIDHash)
+	userIDHash := xxh3.Hash([]byte(loggedUser(r.ctx).ID))
+	return fmt.Sprintf("%s|%016x", r.tableName, userIDHash)
 }
 
 func (r sqlRepository) resetSeededRandom(options []model.QueryOptions) {
diff --git a/persistence/sql_base_repository_test.go b/persistence/sql_base_repository_test.go
index 9c6c6007f..0f76eb6ab 100644
--- a/persistence/sql_base_repository_test.go
+++ b/persistence/sql_base_repository_test.go
@@ -92,14 +92,28 @@ var _ = Describe("sqlRepository", func() {
 				Expect(sort).To(BeEmpty())
 			})
 
-			It("returns the mapped value when sort key exists", func() {
+			// Validation only: buildSortOrder resolves the mapping, so mapping here too would hand
+			// sortMapping its own output and re-map values whose parts are themselves keys.
+			It("accepts a known sort key without resolving it", func() {
 				sort, _ := r.sanitizeSort("sort1", "")
-				Expect(sort).To(Equal("mappedSort1"))
+				Expect(sort).To(Equal("sort1"))
 			})
 
 			It("is case insensitive", func() {
 				sort, _ := r.sanitizeSort("Sort1", "")
-				Expect(sort).To(Equal("mappedSort1"))
+				Expect(sort).To(Equal("sort1"))
+			})
+
+			It("still resolves the mapping by the time the SQL is built", func() {
+				Expect(r.buildSortOrder("sort1", "asc")).To(Equal("mappedSort1 asc"))
+			})
+
+			// A mapping whose parts are themselves keys (media_file rated_at = "rating, rated_at")
+			// must survive the round trip through sanitizeSort and buildSortOrder unduplicated.
+			It("does not re-map a value whose parts are also keys", func() {
+				r.sortMappings = map[string]string{"rating": "rating", "rated_at": "rating, rated_at"}
+				sort, _ := r.sanitizeSort("rated_at", "")
+				Expect(r.buildSortOrder(sort, "asc")).To(Equal("rating asc, rated_at asc"))
 			})
 
 			It("returns the field if it is a valid field", func() {
@@ -135,6 +149,45 @@ var _ = Describe("sqlRepository", func() {
 		})
 	})
 
+	Describe("sortMapping", func() {
+		BeforeEach(func() {
+			r.sortMappings = map[string]string{
+				"name":           "order_album_name, order_album_artist_name",
+				"recently_added": "album.created_at, album.id",
+			}
+		})
+		It("maps a single key", func() {
+			Expect(r.sortMapping("recently_added")).To(Equal("album.created_at, album.id"))
+		})
+		It("maps every part of a comma list when all of them are known keys", func() {
+			Expect(r.sortMapping("recently_added, name")).
+				To(Equal("album.created_at, album.id, order_album_name, order_album_artist_name"))
+		})
+		It("resolves the known parts of a mixed list and leaves the rest as columns", func() {
+			Expect(r.sortMapping("recently_added, play_count")).
+				To(Equal("album.created_at, album.id, play_count"))
+		})
+		// Jellyfin's MusicAlbum SortBy=Runtime,SortName arrives as "duration, name"; duration is a
+		// plain album column while name is mapped, and the mapping must survive the mix.
+		It("keeps a mapping when an earlier part is a plain column", func() {
+			Expect(r.sortMapping("duration, name")).
+				To(Equal("duration, order_album_name, order_album_artist_name"))
+		})
+		It("leaves a raw column list with directions untouched", func() {
+			Expect(r.sortMapping("starred desc, rating desc")).To(Equal("starred desc, rating desc"))
+		})
+		It("does not split an expression on a comma inside its parentheses", func() {
+			Expect(r.sortMapping("coalesce(name, ''), title")).To(Equal("coalesce(name, ''), title"))
+			Expect(r.sortMapping("coalesce(nullif(a,''), b) desc, c")).To(Equal("coalesce(nullif(a,''), b) desc, c"))
+		})
+		It("keeps a mapping whose value nests commas inside parentheses", func() {
+			r.sortMappings["max_year"] = "coalesce(nullif(original_date,''), cast(max_year as text)), release_date"
+			Expect(r.sortMapping("max_year, name")).To(Equal(
+				"coalesce(nullif(original_date,''), cast(max_year as text)), release_date, " +
+					"order_album_name, order_album_artist_name"))
+		})
+	})
+
 	Describe("buildSortOrder", func() {
 		BeforeEach(func() {
 			r.sortMappings = map[string]string{}
diff --git a/persistence/sql_restful.go b/persistence/sql_restful.go
index 1dcabcec6..b1cfd2379 100644
--- a/persistence/sql_restful.go
+++ b/persistence/sql_restful.go
@@ -69,13 +69,11 @@ func (r *sqlRepository) parseRestOptions(ctx context.Context, options ...rest.Qu
 func (r sqlRepository) sanitizeSort(sort, order string) (string, string) {
 	if sort != "" {
 		sort = toSnakeCase(sort)
-		if mapped, ok := r.sortMappings[sort]; ok {
-			sort = mapped
-		} else {
-			if !r.isFieldWhiteListed(sort) {
-				log.Warn(r.ctx, "Ignoring sort not whitelisted", "sort", sort, "table", r.tableName)
-				sort = ""
-			}
+		// Validate only: buildSortOrder resolves the mapping later, and mapping here as well would
+		// feed sortMapping its own output.
+		if _, _, known := r.lookupSortMapping(sort); !known && !r.isFieldWhiteListed(sort) {
+			log.Warn(r.ctx, "Ignoring sort not whitelisted", "sort", sort, "table", r.tableName)
+			sort = ""
 		}
 	}
 	if order != "" {
diff --git a/scanner/folder_entry.go b/scanner/folder_entry.go
index 0e893d6e6..e7eef223c 100644
--- a/scanner/folder_entry.go
+++ b/scanner/folder_entry.go
@@ -23,6 +23,7 @@ func newFolderEntry(job *scanJob, id, path string, info model.FolderUpdateInfo)
 		path:                path,
 		audioFiles:          make(map[string]fs.DirEntry),
 		imageFiles:          make(map[string]fs.DirEntry),
+		playlistFiles:       make(map[string]fs.DirEntry),
 		albumIDMap:          make(map[string]string),
 		updTime:             info.UpdatedAt,
 		prevHash:            info.Hash,
@@ -41,7 +42,7 @@ type folderEntry struct {
 	updTime         time.Time // from DB
 	audioFiles      map[string]fs.DirEntry
 	imageFiles      map[string]fs.DirEntry
-	numPlaylists    int
+	playlistFiles   map[string]fs.DirEntry
 	numSubFolders   int
 	imagesUpdatedAt time.Time
 	prevHash        string // Previous hash from DB
@@ -57,7 +58,7 @@ type folderEntry struct {
 }
 
 func (f *folderEntry) hasNoFiles() bool {
-	return len(f.audioFiles) == 0 && len(f.imageFiles) == 0 && f.numPlaylists == 0
+	return len(f.audioFiles) == 0 && len(f.imageFiles) == 0 && len(f.playlistFiles) == 0
 }
 
 func (f *folderEntry) isEmpty() bool {
@@ -94,7 +95,7 @@ func (f *folderEntry) toFolder() *model.Folder {
 	folder := model.NewFolder(f.job.lib, f.path)
 	folder.NumAudioFiles = len(f.audioFiles)
 	if playlists.InPath(*folder) {
-		folder.NumPlaylists = f.numPlaylists
+		folder.NumPlaylists = len(f.playlistFiles)
 	}
 	folder.ImageFiles = slices.Collect(maps.Keys(f.imageFiles))
 	folder.ImagesUpdatedAt = f.imagesUpdatedAt
@@ -108,16 +109,18 @@ func (f *folderEntry) hash() string {
 		h,
 		"%s:%d:%d:%s",
 		f.modTime.UTC(),
-		f.numPlaylists,
+		len(f.playlistFiles), // redundant with the loop below, but dropping it re-hashes every folder
 		f.numSubFolders,
 		f.imagesUpdatedAt.UTC(),
 	)
 
-	// Sort the keys of audio and image files to ensure consistent hashing
+	// Sort the keys of audio, image and playlist files to ensure consistent hashing
 	audioKeys := slices.Collect(maps.Keys(f.audioFiles))
 	slices.Sort(audioKeys)
 	imageKeys := slices.Collect(maps.Keys(f.imageFiles))
 	slices.Sort(imageKeys)
+	playlistKeys := slices.Collect(maps.Keys(f.playlistFiles))
+	slices.Sort(playlistKeys)
 
 	// Include audio files with their size and modtime
 	for _, key := range audioKeys {
@@ -135,5 +138,14 @@ func (f *folderEntry) hash() string {
 		}
 	}
 
+	// Include playlist files, so a content edit is detected even when the folder's
+	// mtime is preserved (rsync -a) or the playlist is not the newest file.
+	for _, key := range playlistKeys {
+		_, _ = io.WriteString(h, key)
+		if info, err := f.playlistFiles[key].Info(); err == nil {
+			_, _ = fmt.Fprintf(h, ":%d:%s", info.Size(), info.ModTime().UTC().String())
+		}
+	}
+
 	return hex.EncodeToString(h.Sum(nil))
 }
diff --git a/scanner/folder_entry_test.go b/scanner/folder_entry_test.go
index e8e354b38..4493f9309 100644
--- a/scanner/folder_entry_test.go
+++ b/scanner/folder_entry_test.go
@@ -48,6 +48,7 @@ var _ = Describe("folder_entry", func() {
 			Expect(entry.path).To(Equal(path))
 			Expect(entry.audioFiles).To(BeEmpty())
 			Expect(entry.imageFiles).To(BeEmpty())
+			Expect(entry.playlistFiles).To(BeEmpty())
 			Expect(entry.albumIDMap).To(BeEmpty())
 			Expect(entry.updTime).To(Equal(updateInfo.UpdatedAt))
 			Expect(entry.prevHash).To(Equal(updateInfo.Hash))
@@ -95,7 +96,7 @@ var _ = Describe("folder_entry", func() {
 			})
 
 			It("returns false when folder has playlists", func() {
-				entry.numPlaylists = 1
+				entry.playlistFiles["list.m3u"] = &fakeDirEntry{name: "list.m3u"}
 				Expect(entry.hasNoFiles()).To(BeFalse())
 			})
 
@@ -107,7 +108,7 @@ var _ = Describe("folder_entry", func() {
 			It("returns false when folder has multiple types of content", func() {
 				entry.audioFiles["test.mp3"] = &fakeDirEntry{name: "test.mp3"}
 				entry.imageFiles["cover.jpg"] = &fakeDirEntry{name: "cover.jpg"}
-				entry.numPlaylists = 2
+				entry.playlistFiles["list.m3u"] = &fakeDirEntry{name: "list.m3u"}
 				entry.numSubFolders = 3
 				Expect(entry.hasNoFiles()).To(BeFalse())
 			})
@@ -149,7 +150,11 @@ var _ = Describe("folder_entry", func() {
 					"cover.jpg":  &fakeDirEntry{name: "cover.jpg"},
 					"folder.png": &fakeDirEntry{name: "folder.png"},
 				}
-				entry.numPlaylists = 3
+				entry.playlistFiles = map[string]fs.DirEntry{
+					"list1.m3u": &fakeDirEntry{name: "list1.m3u"},
+					"list2.m3u": &fakeDirEntry{name: "list2.m3u"},
+					"list3.m3u": &fakeDirEntry{name: "list3.m3u"},
+				}
 				entry.imagesUpdatedAt = time.Now()
 			})
 
@@ -200,7 +205,10 @@ var _ = Describe("folder_entry", func() {
 					"z.jpg": &fakeDirEntry{name: "z.jpg"},
 					"x.png": &fakeDirEntry{name: "x.png"},
 				}
-				entry.numPlaylists = 2
+				entry.playlistFiles = map[string]fs.DirEntry{
+					"q.m3u": &fakeDirEntry{name: "q.m3u"},
+					"p.m3u": &fakeDirEntry{name: "p.m3u"},
+				}
 				entry.numSubFolders = 3
 
 				hash1 := entry.hash()
@@ -214,6 +222,10 @@ var _ = Describe("folder_entry", func() {
 					"x.png": &fakeDirEntry{name: "x.png"},
 					"z.jpg": &fakeDirEntry{name: "z.jpg"},
 				}
+				entry.playlistFiles = map[string]fs.DirEntry{
+					"p.m3u": &fakeDirEntry{name: "p.m3u"},
+					"q.m3u": &fakeDirEntry{name: "q.m3u"},
+				}
 
 				hash2 := entry.hash()
 				Expect(hash1).To(Equal(hash2))
@@ -252,10 +264,10 @@ var _ = Describe("folder_entry", func() {
 				Expect(hash1).ToNot(Equal(hash2))
 			})
 
-			It("produces different hash when playlist count changes", func() {
+			It("produces different hash when playlist files change", func() {
 				hash1 := entry.hash()
 
-				entry.numPlaylists = 5
+				entry.playlistFiles["new.m3u"] = &fakeDirEntry{name: "new.m3u"}
 				hash2 := entry.hash()
 
 				Expect(hash1).ToNot(Equal(hash2))
@@ -377,6 +389,58 @@ var _ = Describe("folder_entry", func() {
 				Expect(hash1).ToNot(Equal(hash2))
 			})
 
+			It("produces different hash when playlist file size changes", func() {
+				baseTime := time.Now()
+				entry.playlistFiles["list.m3u"] = &fakeDirEntry{
+					name:     "list.m3u",
+					fileInfo: &fakeFileInfo{name: "list.m3u", size: 1000, modTime: baseTime},
+				}
+				hash1 := entry.hash()
+
+				entry.playlistFiles["list.m3u"] = &fakeDirEntry{
+					name:     "list.m3u",
+					fileInfo: &fakeFileInfo{name: "list.m3u", size: 2000, modTime: baseTime},
+				}
+				hash2 := entry.hash()
+
+				Expect(hash1).ToNot(Equal(hash2))
+			})
+
+			It("produces different hash when playlist file modification time changes", func() {
+				baseTime := time.Now()
+				entry.playlistFiles["list.m3u"] = &fakeDirEntry{
+					name:     "list.m3u",
+					fileInfo: &fakeFileInfo{name: "list.m3u", size: 1000, modTime: baseTime},
+				}
+				hash1 := entry.hash()
+
+				entry.playlistFiles["list.m3u"] = &fakeDirEntry{
+					name:     "list.m3u",
+					fileInfo: &fakeFileInfo{name: "list.m3u", size: 1000, modTime: baseTime.Add(1 * time.Hour)},
+				}
+				hash2 := entry.hash()
+
+				Expect(hash1).ToNot(Equal(hash2))
+			})
+
+			It("produces different hash when a playlist is renamed", func() {
+				baseTime := time.Now()
+				entry.playlistFiles["old.m3u"] = &fakeDirEntry{
+					name:     "old.m3u",
+					fileInfo: &fakeFileInfo{name: "old.m3u", size: 1000, modTime: baseTime},
+				}
+				hash1 := entry.hash()
+
+				delete(entry.playlistFiles, "old.m3u")
+				entry.playlistFiles["new.m3u"] = &fakeDirEntry{
+					name:     "new.m3u",
+					fileInfo: &fakeFileInfo{name: "new.m3u", size: 1000, modTime: baseTime},
+				}
+				hash2 := entry.hash()
+
+				Expect(hash1).ToNot(Equal(hash2))
+			})
+
 			It("produces valid hex-encoded hash", func() {
 				hash := entry.hash()
 				Expect(hash).To(HaveLen(32)) // MD5 hash should be 32 hex characters
@@ -421,7 +485,7 @@ var _ = Describe("folder_entry", func() {
 				})
 
 				It("returns true when hash has changed", func() {
-					entry.numPlaylists = 10 // Change something to change the hash
+					entry.playlistFiles["list.m3u"] = &fakeDirEntry{name: "list.m3u"} // Change something to change the hash
 					Expect(entry.isOutdated()).To(BeTrue())
 				})
 
@@ -445,7 +509,7 @@ var _ = Describe("folder_entry", func() {
 
 				It("returns true when full scan condition is not met but hash changed", func() {
 					entry.updTime = entry.job.lib.LastScanStartedAt.Add(1 * time.Hour)
-					entry.numPlaylists = 10 // Change hash
+					entry.playlistFiles["list.m3u"] = &fakeDirEntry{name: "list.m3u"} // Change hash
 					Expect(entry.isOutdated()).To(BeTrue())
 				})
 			})
diff --git a/scanner/phase_1_folders.go b/scanner/phase_1_folders.go
index 82e91d5ad..6107b3316 100644
--- a/scanner/phase_1_folders.go
+++ b/scanner/phase_1_folders.go
@@ -165,7 +165,7 @@ func (p *phaseFolders) producer() ppl.Producer[*folderEntry] {
 				log.Trace(p.ctx, "Scanner: Checking folder state", " folder", folder.path, "_updTime", folder.updTime,
 					"_modTime", folder.modTime, "_lastScanStartedAt", folder.job.lib.LastScanStartedAt,
 					"numAudioFiles", len(folder.audioFiles), "numImageFiles", len(folder.imageFiles),
-					"numPlaylists", folder.numPlaylists, "numSubfolders", folder.numSubFolders)
+					"numPlaylists", len(folder.playlistFiles), "numSubfolders", folder.numSubFolders)
 
 				// Check if folder is outdated
 				if folder.isOutdated() {
@@ -492,7 +492,7 @@ func (p *phaseFolders) logFolder(entry *folderEntry) (*folderEntry, error) {
 		logCall = log.Trace
 	}
 	logCall(p.ctx, "Scanner: Completed processing folder",
-		"audioCount", len(entry.audioFiles), "imageCount", len(entry.imageFiles), "plsCount", entry.numPlaylists,
+		"audioCount", len(entry.audioFiles), "imageCount", len(entry.imageFiles), "plsCount", len(entry.playlistFiles),
 		"elapsed", entry.elapsed.Elapsed(), "tracksMissing", len(entry.missingTracks),
 		"tracksImported", len(entry.tracks), "library", entry.job.lib.Name, consts.Zwsp+"folder", entry.path)
 	return entry, nil
diff --git a/scanner/walk_dir_tree.go b/scanner/walk_dir_tree.go
index 887344b1b..20f6d4213 100644
--- a/scanner/walk_dir_tree.go
+++ b/scanner/walk_dir_tree.go
@@ -82,7 +82,7 @@ func walkFolder(ctx context.Context, job *scanJob, currentFolder string, checker
 
 	dir := path.Clean(currentFolder)
 	log.Trace(ctx, "Scanner: Found directory", " path", dir, "audioFiles", maps.Keys(folder.audioFiles),
-		"images", maps.Keys(folder.imageFiles), "playlists", folder.numPlaylists, "imagesUpdatedAt", folder.imagesUpdatedAt,
+		"images", maps.Keys(folder.imageFiles), "playlists", len(folder.playlistFiles), "imagesUpdatedAt", folder.imagesUpdatedAt,
 		"updTime", folder.updTime, "modTime", folder.modTime, "numChildren", len(children))
 	folder.path = dir
 	folder.elapsed.Start()
@@ -157,7 +157,7 @@ func loadDir(ctx context.Context, job *scanJob, dirPath string, checker *IgnoreC
 			case model.IsAudioFile(name):
 				folder.audioFiles[entry.Name()] = entry
 			case model.IsValidPlaylist(name):
-				folder.numPlaylists++
+				folder.playlistFiles[entry.Name()] = entry
 			case model.IsImageFile(name):
 				folder.imageFiles[entry.Name()] = entry
 				folder.imagesUpdatedAt = utils.TimeNewest(folder.imagesUpdatedAt, fileInfo.ModTime(), folder.modTime)
diff --git a/server/jellyfin/README.md b/server/jellyfin/README.md
index 5759e6cc0..dc3219dfa 100644
--- a/server/jellyfin/README.md
+++ b/server/jellyfin/README.md
@@ -104,7 +104,11 @@ album's tracks — Feishin fetches them this way instead of `ParentId`); `GenreI
 genre's albums or tracks — Finamp's genre screen sends it the same way; `/Artists/AlbumArtists`
 and `MusicArtist` queries accept it too, matching artists credited on an album of that genre);
 `SearchTerm`;
-favorites-only (`Filters=IsFavorite` or the standalone `isFavorite=true`); `SortBy`/`SortOrder`;
+`Filters` (`IsFavorite`, `IsFavoriteOrLikes`, `IsPlayed`, `IsUnplayed`) and the standalone
+`isFavorite`/`isPlayed` booleans it can also be expressed as — `Filters` wins when both are sent, as
+in Jellyfin; `Likes`, `Dislikes`, `IsFolder`, `IsNotFolder` and `IsResumable` have no Navidrome
+equivalent and are ignored; `SortBy`/`SortOrder` (every recognized key is applied in order, so secondary keys break ties;
+unrecognized keys are skipped, and `Random` always sorts alone);
 `StartIndex`/`Limit`; and `Ids` (batch fetch by id). `Recursive=false` with a library `ParentId`
 returns direct children only (no tracks — no track is a library's direct child).
 
diff --git a/server/jellyfin/browsing.go b/server/jellyfin/browsing.go
index 9acd8d5a8..25c44e748 100644
--- a/server/jellyfin/browsing.go
+++ b/server/jellyfin/browsing.go
@@ -24,10 +24,6 @@ func (api *Router) getAlbumArtists(w http.ResponseWriter, r *http.Request) {
 // when accessible (like queryItems) or all accessible libraries otherwise.
 func (api *Router) listArtistsByRole(w http.ResponseWriter, r *http.Request, role model.Role) {
 	ctx := r.Context()
-	p := req.Params(r)
-	opts := model.QueryOptions{Offset: p.IntOr("startindex", 0), Max: p.IntOr("limit", 0)}
-	applySort(&opts, "MusicArtist", p.StringOr("sortby", ""), p.StringOr("sortorder", ""))
-
 	scopeIDs, _, ok := parentIDScope(ctx, r)
 	if !ok {
 		http.Error(w, "Not Found", http.StatusNotFound)
@@ -38,14 +34,13 @@ func (api *Router) listArtistsByRole(w http.ResponseWriter, r *http.Request, rol
 		http.Error(w, "Not Found", http.StatusNotFound)
 		return
 	}
-	// Only the fields listArtists reads; /Artists has no favorites filter, so favOnly stays false.
-	// Finamp's artist tab sends GenreIds when a genre filter is active.
-	q := itemsQuery{
-		scopeIDs: scopeIDs,
-		genreIds: genreIds,
-		search:   searchTerm(p),
-		fields:   dto.ParseFields(p.Strings("fields")...),
-	}
+	// This route resolves its own scope, so it shares only the plain query params with /Items.
+	q := listParams(req.Params(r))
+	q.scopeIDs = scopeIDs
+	q.genreIds = genreIds
+
+	opts := model.QueryOptions{Offset: q.offset, Max: q.limit}
+	applySort(&opts, "MusicArtist", q.sortBy, q.sortOrder)
 	if q.search != "" {
 		opts.Max = clampLimit(opts.Max, defaultSearchLimit, maxSearchLimit)
 	}
diff --git a/server/jellyfin/browsing_test.go b/server/jellyfin/browsing_test.go
index 2825c03e8..657c7a42c 100644
--- a/server/jellyfin/browsing_test.go
+++ b/server/jellyfin/browsing_test.go
@@ -156,6 +156,29 @@ var _ = Describe("Browsing", func() {
 			Expect(sql).NotTo(ContainSubstring("library_artist.library_id"))
 		})
 
+		DescribeTable("restricts to favorites",
+			func(url string, handler func(*Router) http.HandlerFunc) {
+				artistRepo := ds.Artist(context.Background()).(*tests.MockArtistRepo)
+				artistRepo.SetData(model.Artists{{ID: testID("ar1"), Name: "Artist"}})
+				w := httptest.NewRecorder()
+				r := httptest.NewRequest("GET", url, nil).WithContext(ctxUser(model.Libraries{{ID: 1}}))
+				invoke(handler(api), w, r)
+				Expect(w.Code).To(Equal(http.StatusOK))
+				sql, args, err := artistRepo.Options.Filters.ToSql()
+				Expect(err).NotTo(HaveOccurred())
+				Expect(sql).To(ContainSubstring("starred"))
+				// listArtists always ANDs notMissing, favorites filter or not.
+				Expect(sql).To(ContainSubstring("missing"))
+				Expect(args).To(ContainElement(true))
+			},
+			Entry("Filters=IsFavorite", "/Artists?Filters=IsFavorite",
+				func(a *Router) http.HandlerFunc { return a.getArtists }),
+			Entry("isFavorite=true", "/Artists?isFavorite=true",
+				func(a *Router) http.HandlerFunc { return a.getArtists }),
+			Entry("on /Artists/AlbumArtists", "/Artists/AlbumArtists?Filters=IsFavorite",
+				func(a *Router) http.HandlerFunc { return a.getAlbumArtists }),
+		)
+
 		It("404s a malformed ParentId instead of listing every library's artists", func() {
 			artistRepo := ds.Artist(context.Background()).(*tests.MockArtistRepo)
 			artistRepo.SetData(model.Artists{{ID: testID("ar1"), Name: "Artist"}})
diff --git a/server/jellyfin/images.go b/server/jellyfin/images.go
index 65f02d7a0..fcf69c039 100644
--- a/server/jellyfin/images.go
+++ b/server/jellyfin/images.go
@@ -11,7 +11,6 @@ import (
 	_ "image/png"
 	"io"
 	"net/http"
-	"strconv"
 
 	"github.com/dustin/go-humanize"
 	"github.com/navidrome/navidrome/conf"
@@ -20,9 +19,20 @@ import (
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/model/request"
 	"github.com/navidrome/navidrome/server/imghttp"
+	"github.com/navidrome/navidrome/utils/req"
 	_ "golang.org/x/image/webp"
 )
 
+// imageSize picks the tighter of Jellyfin's two bounds, because Navidrome resizes on a single
+// dimension: reading only MaxWidth serves the full-size original to a client that sent MaxHeight.
+func imageSize(maxWidth, maxHeight int) int {
+	w, h := max(maxWidth, 0), max(maxHeight, 0)
+	if w == 0 || h == 0 {
+		return max(w, h)
+	}
+	return min(w, h)
+}
+
 func (api *Router) getItemImage(w http.ResponseWriter, r *http.Request) {
 	// Public endpoint, like real Jellyfin's image routes: clients fetch cover URLs without credentials
 	// and item ids are unguessable, so resolution runs elevated to bypass the visibility filter.
@@ -31,7 +41,8 @@ func (api *Router) getItemImage(w http.ResponseWriter, r *http.Request) {
 	if !ok {
 		return
 	}
-	size, _ := strconv.Atoi(r.URL.Query().Get("maxwidth"))
+	p := req.Params(r)
+	size := imageSize(p.IntOr("maxwidth", 0), p.IntOr("maxheight", 0))
 
 	artID := api.resolveArtworkID(ctx, itemId)
 	img, err := api.artwork.GetOrPlaceholder(ctx, artID, size, false)
diff --git a/server/jellyfin/images_test.go b/server/jellyfin/images_test.go
index 0e0d6220d..2f32e6ec9 100644
--- a/server/jellyfin/images_test.go
+++ b/server/jellyfin/images_test.go
@@ -30,14 +30,16 @@ import (
 
 type fakeArtwork struct {
 	artwork.Artwork
-	recvId  string
-	recvCtx context.Context
-	data    []byte
-	hash    string
+	recvId   string
+	recvSize int
+	recvCtx  context.Context
+	data     []byte
+	hash     string
 }
 
 func (f *fakeArtwork) GetOrPlaceholder(ctx context.Context, id string, size int, square bool) (*artwork.Image, error) {
 	f.recvId = id
+	f.recvSize = size
 	f.recvCtx = ctx
 	data := f.data
 	if data == nil {
@@ -61,6 +63,29 @@ func newImageRequest(itemId string) (*httptest.ResponseRecorder, *http.Request)
 }
 
 var _ = Describe("Images", func() {
+	// Real Jellyfin fits the image inside either bound, so a client that sends only MaxHeight must
+	// still get a resized image rather than the full-size original.
+	DescribeTable("derives the requested size from MaxWidth or MaxHeight",
+		func(query string, wantSize int) {
+			ds := &tests.MockDataStore{}
+			ds.Album(context.Background()).(*tests.MockAlbumRepo).SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
+			fa := &fakeArtwork{}
+			api := &Router{ds: ds, artwork: fa}
+
+			w, r := newImageRequest(dto.EncodeID(testID("a1")))
+			r.URL.RawQuery = query
+			api.getItemImage(w, r)
+
+			Expect(w.Code).To(Equal(http.StatusOK))
+			Expect(fa.recvSize).To(Equal(wantSize))
+		},
+		Entry("MaxWidth only", "maxwidth=300", 300),
+		Entry("MaxHeight only", "maxheight=300", 300),
+		Entry("both, smaller bound wins", "maxwidth=200&maxheight=300", 200),
+		Entry("both, smaller bound wins regardless of order", "maxwidth=300&maxheight=200", 200),
+		Entry("neither", "", 0),
+	)
+
 	It("streams album artwork", func() {
 		ds := &tests.MockDataStore{}
 		ds.Album(context.Background()).(*tests.MockAlbumRepo).SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
diff --git a/server/jellyfin/items.go b/server/jellyfin/items.go
index de0da88eb..eb5cd2a1a 100644
--- a/server/jellyfin/items.go
+++ b/server/jellyfin/items.go
@@ -31,6 +31,51 @@ func searchTerm(p *req.Values) string {
 	return strings.TrimSpace(p.StringOr("searchterm", ""))
 }
 
+// itemFilters is the parsed Filters=... list together with the standalone isFavorite/isPlayed params
+// clients may send instead. A nil field means the client asked for no filtering on that dimension.
+type itemFilters struct {
+	favorite *bool
+	played   *bool
+}
+
+// parseItemFilters reads the standalone params first and lets the Filters list win, matching real
+// Jellyfin. Tokens with no Navidrome equivalent (Likes, IsFolder, IsResumable) are dropped.
+func parseItemFilters(p *req.Values) itemFilters {
+	f := itemFilters{favorite: p.BoolPtr("isfavorite"), played: p.BoolPtr("isplayed")}
+	for token := range strings.SplitSeq(p.StringOr("filters", ""), ",") {
+		switch strings.TrimSpace(token) {
+		case "IsFavorite", "IsFavoriteOrLikes":
+			f.favorite = new(true)
+		case "IsPlayed":
+			f.played = new(true)
+		case "IsUnplayed":
+			f.played = new(false)
+		}
+	}
+	return f
+}
+
+// predicates renders the filters as annotation-column conditions. The negative cases have to match
+// NULL as well: annotations are LEFT JOINed, so an item nobody has touched has no row at all.
+func (f itemFilters) predicates() []squirrel.Sqlizer {
+	var out []squirrel.Sqlizer
+	if f.favorite != nil {
+		if *f.favorite {
+			out = append(out, squirrel.Eq{"starred": true})
+		} else {
+			out = append(out, squirrel.Or{squirrel.Eq{"starred": nil}, squirrel.Eq{"starred": false}})
+		}
+	}
+	if f.played != nil {
+		if *f.played {
+			out = append(out, squirrel.Gt{"play_count": 0})
+		} else {
+			out = append(out, squirrel.Or{squirrel.Eq{"play_count": nil}, squirrel.Eq{"play_count": 0}})
+		}
+	}
+	return out
+}
+
 func (api *Router) getItems(w http.ResponseWriter, r *http.Request) {
 	res, err := api.queryItems(r.Context(), r)
 	if err != nil {
@@ -214,7 +259,7 @@ type itemsQuery struct {
 	sortOrder string
 	offset    int
 	limit     int
-	favOnly   bool
+	filters   itemFilters
 	// parentId scopes the query. entityParent is the same id only when it names an entity (an artist
 	// for MusicAlbum, an album for Audio) rather than a library.
 	parentId        string
@@ -231,6 +276,19 @@ type itemsQuery struct {
 	studioIds        []string
 }
 
+// listParams reads the itemsQuery fields that come straight from query params.
+func listParams(p *req.Values) itemsQuery {
+	return itemsQuery{
+		fields:    dto.ParseFields(p.Strings("fields")...),
+		search:    searchTerm(p),
+		sortBy:    p.StringOr("sortby", ""),
+		sortOrder: p.StringOr("sortorder", ""),
+		offset:    p.IntOr("startindex", 0),
+		limit:     p.IntOr("limit", 0),
+		filters:   parseItemFilters(p),
+	}
+}
+
 // parseItemsQuery also resolves the entity types (inferring them from the parent when
 // IncludeItemTypes is absent) and the library scope. Query keys are read lowercase because
 // normalizeQueryKeys folded them (Jellyfin binds case-insensitively). A non-empty id param that
@@ -261,24 +319,14 @@ func (api *Router) parseItemsQuery(ctx context.Context, r *http.Request) (itemsQ
 	if !ok {
 		return itemsQuery{}, model.ErrNotFound
 	}
-	q := itemsQuery{
-		fields:    dto.ParseFields(p.Strings("fields")...),
-		ids:       ids,
-		rawTypes:  p.StringOr("includeitemtypes", ""),
-		search:    searchTerm(p),
-		sortBy:    p.StringOr("sortby", ""),
-		sortOrder: p.StringOr("sortorder", ""),
-		offset:    p.IntOr("startindex", 0),
-		limit:     p.IntOr("limit", 0),
-		// Clients express "favorites only" two ways: Filters=IsFavorite and the standalone
-		// isFavorite=true param (Finamp's "Favourite tracks" widget uses the latter).
-		favOnly:   strings.Contains(p.StringOr("filters", ""), "IsFavorite") || p.BoolOr("isfavorite", false),
-		parentId:  parentId,
-		genreIds:  genreIds,
-		albumIds:  albumIds,
-		years:     parseYears(r),
-		studioIds: studioIds,
-	}
+	q := listParams(p)
+	q.ids = ids
+	q.rawTypes = p.StringOr("includeitemtypes", "")
+	q.parentId = parentId
+	q.genreIds = genreIds
+	q.albumIds = albumIds
+	q.years = parseYears(r)
+	q.studioIds = studioIds
 	// An artist's page filters by artist, not ParentId: Finamp sends ParentId=<libraryId> for scoping
 	// plus AlbumArtistIds/ArtistIds/contributingArtistIds for the artist.
 	albumArtistScope := firstNonEmpty(p.StringOr("albumartistids", ""), p.StringOr("artistids", ""))
@@ -621,8 +669,10 @@ func (api *Router) listAlbums(ctx context.Context, opts model.QueryOptions, q it
 	if len(q.studioIds) > 0 {
 		filters = append(filters, filter.ByStudioID(q.studioIds))
 	}
-	if q.favOnly {
-		filters = append(filters, filter.ByStarred().Filters)
+	// Not on the search path: its first FTS phase selects rowids with no annotation join, so a
+	// starred/play_count predicate there is "no such column" rather than a filter.
+	if q.search == "" {
+		filters = append(filters, q.filters.predicates()...)
 	}
 	opts.Filters = filters
 	opts = filter.ApplyLibraryFilter(opts, q.scopeIDs)
@@ -668,8 +718,10 @@ func (api *Router) listSongs(ctx context.Context, opts model.QueryOptions, q ite
 	if len(q.studioIds) > 0 {
 		filters = append(filters, filter.ByStudioID(q.studioIds))
 	}
-	if q.favOnly {
-		filters = append(filters, filter.ByStarred().Filters)
+	// Not on the search path: its first FTS phase selects rowids with no annotation join, so a
+	// starred/play_count predicate there is "no such column" rather than a filter.
+	if q.search == "" {
+		filters = append(filters, q.filters.predicates()...)
 	}
 	opts.Filters = filters
 	opts = filter.ApplyLibraryFilter(opts, q.scopeIDs)
@@ -720,14 +772,12 @@ func (api *Router) listArtists(ctx context.Context, opts model.QueryOptions, q i
 		return materialized(result(slice.Map(artists, toItem), total, opts.Offset)), nil
 	}
 
-	if q.favOnly {
-		opts.Filters = filter.ArtistsByStarred().Filters
-	} else {
-		opts.Filters = notMissing
-	}
+	filters := squirrel.And{notMissing}
+	filters = append(filters, q.filters.predicates()...)
 	if len(q.genreIds) > 0 {
-		opts.Filters = squirrel.And{opts.Filters, filter.ArtistsByGenreID(q.genreIds)}
+		filters = append(filters, filter.ArtistsByGenreID(q.genreIds))
 	}
+	opts.Filters = filters
 	opts = filter.ArtistsByRole(opts, role)
 	opts = filter.ApplyArtistLibraryFilter(opts, q.scopeIDs)
 	total, _ := repo.CountAll(model.QueryOptions{Filters: opts.Filters})
@@ -752,13 +802,8 @@ func (api *Router) listGenres(ctx context.Context, opts model.QueryOptions) (ite
 // listPlaylists lists playlists visible to the current user. Visibility (public or owned) is
 // enforced by playlistRepository, not scopeIDs.
 func (api *Router) listPlaylists(ctx context.Context, opts model.QueryOptions, q itemsQuery) (itemsResult, error) {
-	if q.favOnly {
-		starred := squirrel.Eq{"starred": true}
-		if opts.Filters == nil {
-			opts.Filters = starred
-		} else {
-			opts.Filters = squirrel.And{opts.Filters, starred}
-		}
+	if preds := q.filters.predicates(); len(preds) > 0 {
+		opts.Filters = squirrel.And(preds)
 	}
 	repo := api.ds.Playlist(ctx)
 	total, err := repo.CountAll(model.QueryOptions{Filters: opts.Filters})
@@ -908,18 +953,32 @@ func result(items []dto.BaseItemDto, total, start int) dto.QueryResult {
 	return dto.QueryResult{Items: items, TotalRecordCount: total, StartIndex: start}
 }
 
-// applySort translates Jellyfin's SortBy/SortOrder into a valid model.QueryOptions sort key for the
-// item type. Clients send SortBy as a comma-separated fallback list (e.g. "DateCreated,SortName");
-// this uses the first recognized key. An unrecognized SortBy is left untouched (the repo's default),
-// not passed through raw where it could produce an invalid ORDER BY.
+// applySort keeps every recognized SortBy key, so secondary keys break ties as Jellyfin intends.
+// Unrecognized keys are skipped, not passed through raw where they could make an invalid ORDER BY.
 func applySort(opts *model.QueryOptions, itemType, sortBy, order string) {
+	var cols []string
 	for key := range strings.SplitSeq(sortBy, ",") {
-		if col, ok := sortColumn(itemType, strings.TrimSpace(key)); ok {
-			opts.Sort = col
+		col, ok := sortColumn(itemType, strings.TrimSpace(key))
+		// The repo matches random by exact string equality, so it can only ever sort alone.
+		if !ok || slices.Contains(cols, col) || (col == "random" && len(cols) > 0) {
+			continue
+		}
+		cols = append(cols, col)
+		if col == "random" {
 			break
 		}
 	}
-	if strings.EqualFold(order, "Descending") {
+	switch {
+	case len(cols) > 0:
+		opts.Sort = strings.Join(cols, ", ")
+	case sortBy != "":
+		log.Debug("Jellyfin API: no usable SortBy key, falling back to the default order",
+			"itemType", itemType, "sortBy", sortBy)
+	}
+	// Jellyfin allows a per-key SortOrder list, which one Order can't express; honor the first value
+	// for every key, as Jellyfin does for keys past the end of the list.
+	first, _, _ := strings.Cut(order, ",")
+	if strings.EqualFold(first, "Descending") {
 		opts.Order = "desc"
 	}
 }
@@ -941,6 +1000,8 @@ var sortColumnsByType = map[string]map[string]string{
 		"dateplayed":        "play_date",
 		"communityrating":   "rating",
 		"random":            "random",
+		"runtime":           "duration",
+		"runtimeticks":      "duration",
 		// Finamp's "Latest Releases" sorts by PremiereDate; "year" matches songs' ProductionYear.
 		"premieredate":   "year",
 		"productionyear": "year",
@@ -964,6 +1025,8 @@ var sortColumnsByType = map[string]map[string]string{
 		"playcount":       "play_count",
 		"dateplayed":      "play_date",
 		"communityrating": "rating",
+		"runtime":         "duration",
+		"runtimeticks":    "duration",
 		"premieredate":    "max_year", "productionyear": "max_year",
 	},
 	"MusicGenre": {
diff --git a/server/jellyfin/items_test.go b/server/jellyfin/items_test.go
index b227ab719..17180c36a 100644
--- a/server/jellyfin/items_test.go
+++ b/server/jellyfin/items_test.go
@@ -327,17 +327,75 @@ var _ = Describe("Items", func() {
 			Expect(albumRepo.Options.Max).To(Equal(3))
 		})
 
-		It("applies a starred filter when Filters=IsFavorite", func() {
-			albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
-			albumRepo.SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
-			w := httptest.NewRecorder()
-			r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=MusicAlbum&Filters=IsFavorite", nil).WithContext(ctxUser())
-			invoke(api.getItems, w, r)
-			Expect(w.Code).To(Equal(http.StatusOK))
-			sql, _, err := albumRepo.Options.Filters.ToSql()
-			Expect(err).NotTo(HaveOccurred())
-			Expect(sql).To(ContainSubstring("starred"))
-		})
+		DescribeTable("translates the Filters list and its standalone equivalents",
+			func(query string, wantSQL, notWantSQL []string) {
+				albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
+				albumRepo.SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
+				w := httptest.NewRecorder()
+				r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=MusicAlbum&"+query, nil).WithContext(ctxUser())
+				invoke(api.getItems, w, r)
+				Expect(w.Code).To(Equal(http.StatusOK))
+				sql, _, err := albumRepo.Options.Filters.ToSql()
+				Expect(err).NotTo(HaveOccurred())
+				for _, want := range wantSQL {
+					Expect(sql).To(ContainSubstring(want))
+				}
+				for _, not := range notWantSQL {
+					Expect(sql).NotTo(ContainSubstring(not))
+				}
+			},
+			Entry("IsFavorite", "Filters=IsFavorite", []string{"starred"}, nil),
+			Entry("IsFavorite,IsUnplayed combined", "Filters=IsFavorite,IsUnplayed",
+				[]string{"starred", "play_count"}, nil),
+			Entry("IsUnplayed", "Filters=IsUnplayed", []string{"play_count"}, []string{"starred"}),
+			Entry("IsPlayed", "Filters=IsPlayed", []string{"play_count"}, []string{"starred"}),
+			Entry("IsFavoriteOrLikes is treated as favorites", "Filters=IsFavoriteOrLikes", []string{"starred"}, nil),
+			Entry("isPlayed=false", "isPlayed=false", []string{"play_count"}, nil),
+			Entry("isFavorite=false still filters", "isFavorite=false", []string{"starred"}, nil),
+			// Jellyfin builds the query from the standalone params, then applies Filters over the top.
+			Entry("Filters wins over the standalone param", "isFavorite=false&Filters=IsFavorite",
+				[]string{"starred = "}, nil),
+			// No Navidrome equivalent: these must be dropped, not half-applied.
+			Entry("Likes is ignored", "Filters=Likes", nil, []string{"starred", "play_count"}),
+			Entry("IsResumable is ignored", "Filters=IsResumable", nil, []string{"starred", "play_count"}),
+			// The artist-parent branch gets notMissing from filter.AlbumsByArtistID, not the default
+			// branch, so favorites must not be the only predicate left on it.
+			Entry("keeps missing excluded under an artist parent",
+				"Filters=IsFavorite&ArtistIds="+dto.EncodeID(testID("ar1")),
+				[]string{"starred", "missing"}, nil),
+		)
+
+		// Search runs a two-phase FTS query whose first phase has no annotation join, so an
+		// annotation predicate there is "no such column: starred" -> 500.
+		DescribeTable("does not push annotation filters into a search",
+			func(itemType, filters string) {
+				ds.Album(context.Background()).(*tests.MockAlbumRepo).SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
+				ds.MediaFile(context.Background()).(*tests.MockMediaFileRepo).SetData(model.MediaFiles{{ID: testID("s1"), Title: "Song"}})
+				w := httptest.NewRecorder()
+				r := httptest.NewRequest("GET",
+					"/Items?IncludeItemTypes="+itemType+"&SearchTerm=one&Filters="+filters, nil).WithContext(ctxUser())
+				invoke(api.getItems, w, r)
+				Expect(w.Code).To(Equal(http.StatusOK))
+				var opts model.QueryOptions
+				if itemType == "MusicAlbum" {
+					opts = ds.Album(context.Background()).(*tests.MockAlbumRepo).Options
+				} else {
+					opts = ds.MediaFile(context.Background()).(*tests.MockMediaFileRepo).Options
+				}
+				if opts.Filters == nil {
+					return
+				}
+				sql, _, err := opts.Filters.ToSql()
+				Expect(err).NotTo(HaveOccurred())
+				Expect(sql).NotTo(ContainSubstring("starred"))
+				Expect(sql).NotTo(ContainSubstring("play_count"))
+			},
+			Entry("albums, IsFavorite", "MusicAlbum", "IsFavorite"),
+			Entry("albums, IsUnplayed", "MusicAlbum", "IsUnplayed"),
+			Entry("albums, IsPlayed", "MusicAlbum", "IsPlayed"),
+			Entry("songs, IsFavorite", "Audio", "IsFavorite"),
+			Entry("songs, IsUnplayed", "Audio", "IsUnplayed"),
+		)
 
 		It("forwards SearchTerm to the repo's Search method", func() {
 			albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
@@ -601,65 +659,59 @@ var _ = Describe("Items", func() {
 		})
 
 		Describe("sorting", func() {
-			It("maps SortBy=PlayCount to the play_count column", func() {
-				albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
-				albumRepo.SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
-				w := httptest.NewRecorder()
-				r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=MusicAlbum&SortBy=PlayCount", nil).WithContext(ctxUser())
-				invoke(api.getItems, w, r)
-				Expect(w.Code).To(Equal(http.StatusOK))
-				Expect(albumRepo.Options.Sort).To(Equal("play_count"))
-			})
+			DescribeTable("translates SortBy into the repo's sort keys",
+				func(itemType, sortBy, want string) {
+					albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
+					albumRepo.SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
+					mfRepo := ds.MediaFile(context.Background()).(*tests.MockMediaFileRepo)
+					mfRepo.SetData(model.MediaFiles{{ID: testID("s1"), Title: "Song"}})
+					w := httptest.NewRecorder()
+					r := httptest.NewRequest("GET", "/Items?IncludeItemTypes="+itemType+"&SortBy="+sortBy, nil).WithContext(ctxUser())
+					invoke(api.getItems, w, r)
+					Expect(w.Code).To(Equal(http.StatusOK))
+					got := mfRepo.Options.Sort
+					if itemType == "MusicAlbum" {
+						got = albumRepo.Options.Sort
+					}
+					Expect(got).To(Equal(want))
+				},
+				Entry("PlayCount", "MusicAlbum", "PlayCount", "play_count"),
+				Entry("DatePlayed", "Audio", "DatePlayed", "play_date"),
+				Entry("Runtime on albums", "MusicAlbum", "Runtime", "duration"),
+				Entry("RunTimeTicks alias", "MusicAlbum", "RunTimeTicks", "duration"),
+				// Finamp leads its track sort with Runtime: unless that resolves, the first recognized
+				// key is AlbumArtist and the list looks sorted while being sorted by the wrong thing.
+				Entry("Finamp's Runtime-led track sort", "Audio", "Runtime,AlbumArtist,Album,SortName",
+					"duration, album_artist, album, title"),
+				Entry("every recognized key, in order", "MusicAlbum", "DateCreated,SortName", "recently_added, name"),
+				Entry("a key repeating a column is dropped", "Audio",
+					"PremiereDate,Album,ParentIndexNumber,IndexNumber,SortName", "year, album, title"),
+				// random is matched by exact string equality in the repo, so it can never share a sort.
+				Entry("Random stays alone", "MusicAlbum", "Random,SortName", "random"),
+				Entry("unrecognized keys are skipped", "Audio", "Runtime,Nonsense,SortName", "duration, title"),
+				Entry("only the last key recognized", "Audio", "Unknown1,Unknown2,SortName", "title"),
+				Entry("Finamp's album view is disc+track", "Audio", "ParentIndexNumber,IndexNumber,SortName", "album, title"),
+				Entry("nothing recognized leaves the repo default", "MusicAlbum", "SeriesSortName", ""),
+			)
 
-			It("maps SortBy=DatePlayed to the play_date column", func() {
-				mfRepo := ds.MediaFile(context.Background()).(*tests.MockMediaFileRepo)
-				mfRepo.SetData(model.MediaFiles{{ID: testID("s1"), Title: "Song"}})
-				w := httptest.NewRecorder()
-				r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=Audio&SortBy=DatePlayed", nil).WithContext(ctxUser())
-				invoke(api.getItems, w, r)
-				Expect(w.Code).To(Equal(http.StatusOK))
-				Expect(mfRepo.Options.Sort).To(Equal("play_date"))
-			})
-
-			It("uses the first recognized key in a comma-separated SortBy list", func() {
-				albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
-				albumRepo.SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
-				w := httptest.NewRecorder()
-				r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=MusicAlbum&SortBy=DateCreated,SortName", nil).WithContext(ctxUser())
-				invoke(api.getItems, w, r)
-				Expect(w.Code).To(Equal(http.StatusOK))
-				Expect(albumRepo.Options.Sort).To(Equal("recently_added"))
-			})
-
-			It("skips unrecognized keys in a comma-separated SortBy list to find one that is", func() {
-				mfRepo := ds.MediaFile(context.Background()).(*tests.MockMediaFileRepo)
-				mfRepo.SetData(model.MediaFiles{{ID: testID("s1"), Title: "Song"}})
-				w := httptest.NewRecorder()
-				r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=Audio&SortBy=Unknown1,Unknown2,SortName", nil).WithContext(ctxUser())
-				invoke(api.getItems, w, r)
-				Expect(w.Code).To(Equal(http.StatusOK))
-				Expect(mfRepo.Options.Sort).To(Equal("title"))
-			})
-
-			It("maps Finamp's album view SortBy (ParentIndexNumber,IndexNumber) to disc+track order", func() {
-				mfRepo := ds.MediaFile(context.Background()).(*tests.MockMediaFileRepo)
-				mfRepo.SetData(model.MediaFiles{{ID: testID("s1"), Title: "Song"}})
-				w := httptest.NewRecorder()
-				r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=Audio&SortBy=ParentIndexNumber,IndexNumber,SortName", nil).WithContext(ctxUser())
-				invoke(api.getItems, w, r)
-				Expect(w.Code).To(Equal(http.StatusOK))
-				Expect(mfRepo.Options.Sort).To(Equal("album"))
-			})
-
-			It("leaves Sort at the repo default when no SortBy key is recognized", func() {
-				albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
-				albumRepo.SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
-				w := httptest.NewRecorder()
-				r := httptest.NewRequest("GET", "/Items?IncludeItemTypes=MusicAlbum&SortBy=SeriesSortName", nil).WithContext(ctxUser())
-				invoke(api.getItems, w, r)
-				Expect(w.Code).To(Equal(http.StatusOK))
-				Expect(albumRepo.Options.Sort).To(Equal(""))
-			})
+			// Jellyfin allows a per-key SortOrder list; we cannot express that through one Order, so
+			// we honor the first value for all keys, matching Jellyfin's fallback for extra keys.
+			DescribeTable("reads the first SortOrder value for the whole sort",
+				func(sortOrder, want string) {
+					albumRepo := ds.Album(context.Background()).(*tests.MockAlbumRepo)
+					albumRepo.SetData(model.Albums{{ID: testID("a1"), Name: "One"}})
+					w := httptest.NewRecorder()
+					r := httptest.NewRequest("GET",
+						"/Items?IncludeItemTypes=MusicAlbum&SortBy=Runtime,SortName&SortOrder="+sortOrder, nil).WithContext(ctxUser())
+					invoke(api.getItems, w, r)
+					Expect(w.Code).To(Equal(http.StatusOK))
+					Expect(albumRepo.Options.Order).To(Equal(want))
+				},
+				Entry("ascending", "Ascending", ""),
+				Entry("descending", "Descending", "desc"),
+				Entry("descending leading a list", "Descending,Ascending", "desc"),
+				Entry("ascending leading a list", "Ascending,Descending", ""),
+			)
 		})
 
 		Describe("library scoping", func() {
diff --git a/server/jellyfin/playlists.go b/server/jellyfin/playlists.go
index 805b369c8..ac790a821 100644
--- a/server/jellyfin/playlists.go
+++ b/server/jellyfin/playlists.go
@@ -29,11 +29,11 @@ func playlistsFolder() dto.BaseItemDto {
 	}
 }
 
-// playlistError maps core/playlists write errors to HTTP status: ownership -> 403, missing/invisible
-// -> 404 (never revealing another user's private playlist), else -> 500.
+// playlistError maps core/playlists write errors to HTTP status: ownership or locked -> 403,
+// missing/invisible -> 404 (never revealing another user's private playlist), else -> 500.
 func (api *Router) playlistError(w http.ResponseWriter, r *http.Request, err error) {
 	switch {
-	case errors.Is(err, model.ErrNotAuthorized):
+	case errors.Is(err, model.ErrNotAuthorized), errors.Is(err, model.ErrPlaylistNotEditable):
 		http.Error(w, "Forbidden", http.StatusForbidden)
 	case errors.Is(err, model.ErrNotFound):
 		http.Error(w, "Not Found", http.StatusNotFound)
@@ -262,7 +262,7 @@ func (api *Router) songIDs(ctx context.Context, opts model.QueryOptions) []strin
 }
 
 // addToPlaylist appends items by id, expanding containers into tracks (see expandContainerIDs).
-// AddTracks enforces ownership; any error maps to 404.
+// AddTracks enforces ownership; a locked playlist maps to 403, any other error to 404.
 func (api *Router) addToPlaylist(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 	id, ok := itemIDParam(w, r, "playlistId")
@@ -276,6 +276,10 @@ func (api *Router) addToPlaylist(w http.ResponseWriter, r *http.Request) {
 	}
 	ids := api.expandContainerIDs(ctx, decoded)
 	if _, err := api.playlists.AddTracks(ctx, id, ids); err != nil {
+		if errors.Is(err, model.ErrPlaylistNotEditable) {
+			http.Error(w, "Forbidden", http.StatusForbidden)
+			return
+		}
 		http.Error(w, "Not Found", http.StatusNotFound)
 		return
 	}
@@ -284,7 +288,7 @@ func (api *Router) addToPlaylist(w http.ResponseWriter, r *http.Request) {
 
 // removeFromPlaylist removes entries by entryIds — playlist-entry ids (PlaylistItemId), not media
 // file ids, since RemoveTracks deletes playlist_tracks rows by that id. RemoveTracks enforces
-// ownership; any error maps to 404.
+// ownership; a locked playlist maps to 403, any other error to 404.
 func (api *Router) removeFromPlaylist(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 	id, ok := itemIDParam(w, r, "playlistId")
@@ -302,21 +306,44 @@ func (api *Router) removeFromPlaylist(w http.ResponseWriter, r *http.Request) {
 		ids = append(ids, entry)
 	}
 	if err := api.playlists.RemoveTracks(ctx, id, ids); err != nil {
+		if errors.Is(err, model.ErrPlaylistNotEditable) {
+			http.Error(w, "Forbidden", http.StatusForbidden)
+			return
+		}
 		http.Error(w, "Not Found", http.StatusNotFound)
 		return
 	}
 	w.WriteHeader(http.StatusNoContent)
 }
 
-// getPlaylistUsers and getPlaylistUser answer client probes (e.g. Finamp) made before allowing
-// edits. Navidrome has no per-playlist ACL, so every user is reported CanEdit; ownership is still
-// enforced by AddTracks/RemoveTracks.
+// Clients probe these before offering edits. Navidrome has no per-playlist ACL, so CanEdit carries
+// only editability; ownership is enforced on write, and a lookup error 404s to prevent probing.
 func (api *Router) getPlaylistUsers(w http.ResponseWriter, r *http.Request) {
-	u, _ := request.UserFrom(r.Context())
-	api.ok(w, r, []dto.PlaylistUserPermissions{{UserId: dto.EncodeID(u.ID), CanEdit: true}})
+	ctx := r.Context()
+	id, ok := itemIDParam(w, r, "playlistId")
+	if !ok {
+		return
+	}
+	pls, err := api.playlists.Get(ctx, id)
+	if err != nil {
+		http.Error(w, "Not Found", http.StatusNotFound)
+		return
+	}
+	u, _ := request.UserFrom(ctx)
+	api.ok(w, r, []dto.PlaylistUserPermissions{{UserId: dto.EncodeID(u.ID), CanEdit: pls.TracksEditable()}})
 }
 
 func (api *Router) getPlaylistUser(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	id, ok := itemIDParam(w, r, "playlistId")
+	if !ok {
+		return
+	}
+	pls, err := api.playlists.Get(ctx, id)
+	if err != nil {
+		http.Error(w, "Not Found", http.StatusNotFound)
+		return
+	}
 	userId := chi.URLParam(r, "userId")
-	api.ok(w, r, dto.PlaylistUserPermissions{UserId: userId, CanEdit: true})
+	api.ok(w, r, dto.PlaylistUserPermissions{UserId: userId, CanEdit: pls.TracksEditable()})
 }
diff --git a/server/jellyfin/playlists_test.go b/server/jellyfin/playlists_test.go
index 3599cc784..270f5fe08 100644
--- a/server/jellyfin/playlists_test.go
+++ b/server/jellyfin/playlists_test.go
@@ -381,6 +381,15 @@ var _ = Describe("Playlists", func() {
 			Expect(w.Code).To(Equal(http.StatusNotFound))
 		})
 
+		It("returns 403 when the playlist is not editable (synced/smart), like Jellyfin", func() {
+			fp.addErr = model.ErrPlaylistNotEditable
+			w := httptest.NewRecorder()
+			r := httptest.NewRequest("POST", "/Playlists/"+dto.EncodeID(testID("pl1"))+"/Items?ids="+dto.EncodeID(testID("s1")), nil).WithContext(context.Background())
+			r = withChiURLParam(r, "playlistId", dto.EncodeID(testID("pl1")))
+			invoke(api.addToPlaylist, w, r)
+			Expect(w.Code).To(Equal(http.StatusForbidden))
+		})
+
 		It("passes no ids (not a spurious empty string) when the ids param is absent", func() {
 			w := httptest.NewRecorder()
 			r := httptest.NewRequest("POST", "/Playlists/"+dto.EncodeID(testID("pl1"))+"/Items", nil).WithContext(context.Background())
@@ -430,6 +439,15 @@ var _ = Describe("Playlists", func() {
 			Expect(w.Code).To(Equal(http.StatusNotFound))
 		})
 
+		It("returns 403 when the playlist is not editable (synced/smart), like Jellyfin", func() {
+			fp.removeErr = model.ErrPlaylistNotEditable
+			w := httptest.NewRecorder()
+			r := httptest.NewRequest("DELETE", "/Playlists/"+dto.EncodeID(testID("pl1"))+"/Items?entryIds="+dto.EncodePlaylistEntryID("1"), nil).WithContext(context.Background())
+			r = withChiURLParam(r, "playlistId", dto.EncodeID(testID("pl1")))
+			invoke(api.removeFromPlaylist, w, r)
+			Expect(w.Code).To(Equal(http.StatusForbidden))
+		})
+
 		It("passes no ids (not a spurious empty string) when the entryIds param is absent", func() {
 			w := httptest.NewRecorder()
 			r := httptest.NewRequest("DELETE", "/Playlists/"+dto.EncodeID(testID("pl1"))+"/Items", nil).WithContext(context.Background())
@@ -442,7 +460,8 @@ var _ = Describe("Playlists", func() {
 	})
 
 	Describe("getPlaylistUsers", func() {
-		It("returns the current user with CanEdit true", func() {
+		It("returns the current user with CanEdit true for an editable playlist", func() {
+			fp.getByIDPls = &model.Playlist{ID: testID("pl1")}
 			w := httptest.NewRecorder()
 			ctx := request.WithUser(context.Background(), model.User{ID: testID("u1"), UserName: "alice"})
 			r := httptest.NewRequest("GET", "/Playlists/"+testID("pl1")+"/Users", nil).WithContext(ctx)
@@ -453,21 +472,59 @@ var _ = Describe("Playlists", func() {
 			Expect(json.Unmarshal(w.Body.Bytes(), &res)).To(Succeed())
 			Expect(res).To(Equal([]dto.PlaylistUserPermissions{{UserId: dto.EncodeID(testID("u1")), CanEdit: true}}))
 		})
+
+		It("reports CanEdit false for a synced playlist", func() {
+			fp.getByIDPls = &model.Playlist{ID: testID("pl1"), Sync: true}
+			w := httptest.NewRecorder()
+			ctx := request.WithUser(context.Background(), model.User{ID: testID("u1"), UserName: "alice"})
+			r := httptest.NewRequest("GET", "/Playlists/"+testID("pl1")+"/Users", nil).WithContext(ctx)
+			r = withChiURLParam(r, "playlistId", dto.EncodeID(testID("pl1")))
+			api.getPlaylistUsers(w, r)
+			Expect(w.Code).To(Equal(http.StatusOK))
+			var res []dto.PlaylistUserPermissions
+			Expect(json.Unmarshal(w.Body.Bytes(), &res)).To(Succeed())
+			Expect(res[0].CanEdit).To(BeFalse())
+		})
+
+		It("returns 404 when the playlist is not visible", func() {
+			fp.getByIDErr = model.ErrNotFound
+			w := httptest.NewRecorder()
+			ctx := request.WithUser(context.Background(), model.User{ID: testID("u1"), UserName: "alice"})
+			r := httptest.NewRequest("GET", "/Playlists/"+testID("pl1")+"/Users", nil).WithContext(ctx)
+			r = withChiURLParam(r, "playlistId", dto.EncodeID(testID("pl1")))
+			api.getPlaylistUsers(w, r)
+			Expect(w.Code).To(Equal(http.StatusNotFound))
+		})
 	})
 
 	Describe("getPlaylistUser", func() {
-		It("returns CanEdit true for the requested user", func() {
+		requestUser := func() *httptest.ResponseRecorder {
 			w := httptest.NewRecorder()
 			r := httptest.NewRequest("GET", "/Playlists/"+testID("pl1")+"/Users/"+testID("u1"), nil).WithContext(context.Background())
 			rctx := chi.NewRouteContext()
-			rctx.URLParams.Add("playlistId", testID("pl1"))
+			rctx.URLParams.Add("playlistId", dto.EncodeID(testID("pl1")))
 			rctx.URLParams.Add("userId", testID("u1"))
 			r = r.WithContext(context.WithValue(r.Context(), chi.RouteCtxKey, rctx))
 			api.getPlaylistUser(w, r)
+			return w
+		}
+
+		It("returns CanEdit true for an editable playlist", func() {
+			fp.getByIDPls = &model.Playlist{ID: testID("pl1")}
+			w := requestUser()
 			Expect(w.Code).To(Equal(http.StatusOK))
 			var res dto.PlaylistUserPermissions
 			Expect(json.Unmarshal(w.Body.Bytes(), &res)).To(Succeed())
 			Expect(res).To(Equal(dto.PlaylistUserPermissions{UserId: testID("u1"), CanEdit: true}))
 		})
+
+		It("reports CanEdit false for a synced playlist", func() {
+			fp.getByIDPls = &model.Playlist{ID: testID("pl1"), Sync: true}
+			w := requestUser()
+			Expect(w.Code).To(Equal(http.StatusOK))
+			var res dto.PlaylistUserPermissions
+			Expect(json.Unmarshal(w.Body.Bytes(), &res)).To(Succeed())
+			Expect(res.CanEdit).To(BeFalse())
+		})
 	})
 })
diff --git a/server/nativeapi/playlists.go b/server/nativeapi/playlists.go
index 90b2f9e94..d215eb9dd 100644
--- a/server/nativeapi/playlists.go
+++ b/server/nativeapi/playlists.go
@@ -20,6 +20,20 @@ import (
 
 type restHandler = func(rest.RepositoryConstructor, ...rest.Logger) http.HandlerFunc
 
+// writePlaylistError maps a playlist service error to an HTTP status, or defaultStatus if unknown.
+func writePlaylistError(w http.ResponseWriter, err error, defaultStatus int) {
+	switch {
+	case errors.Is(err, model.ErrNotFound):
+		http.Error(w, err.Error(), http.StatusNotFound)
+	case errors.Is(err, model.ErrNotAuthorized):
+		http.Error(w, err.Error(), http.StatusForbidden)
+	case errors.Is(err, model.ErrPlaylistNotEditable):
+		http.Error(w, err.Error(), http.StatusConflict)
+	default:
+		http.Error(w, err.Error(), defaultStatus)
+	}
+}
+
 func playlistTracksHandler(pls playlists.Playlists, handler restHandler, refreshSmartPlaylist func(*http.Request) bool) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		plsId := chi.URLParam(r, "playlistId")
@@ -111,7 +125,7 @@ func deleteFromPlaylist(pls playlists.Playlists) http.HandlerFunc {
 		}
 		if err != nil {
 			log.Error(r.Context(), "Error deleting tracks from playlist", "playlistId", playlistId, "ids", ids, err)
-			http.Error(w, err.Error(), http.StatusInternalServerError)
+			writePlaylistError(w, err, http.StatusInternalServerError)
 			return
 		}
 		writeDeleteManyResponse(w, r, ids)
@@ -138,22 +152,22 @@ func addToPlaylist(pls playlists.Playlists) http.HandlerFunc {
 		}
 		count, c := 0, 0
 		if c, err = pls.AddTracks(ctx, playlistId, payload.Ids); err != nil {
-			http.Error(w, err.Error(), http.StatusBadRequest)
+			writePlaylistError(w, err, http.StatusBadRequest)
 			return
 		}
 		count += c
 		if c, err = pls.AddAlbums(ctx, playlistId, payload.AlbumIds); err != nil {
-			http.Error(w, err.Error(), http.StatusBadRequest)
+			writePlaylistError(w, err, http.StatusBadRequest)
 			return
 		}
 		count += c
 		if c, err = pls.AddArtists(ctx, playlistId, payload.ArtistIds); err != nil {
-			http.Error(w, err.Error(), http.StatusBadRequest)
+			writePlaylistError(w, err, http.StatusBadRequest)
 			return
 		}
 		count += c
 		if c, err = pls.AddDiscs(ctx, playlistId, payload.Discs); err != nil {
-			http.Error(w, err.Error(), http.StatusBadRequest)
+			writePlaylistError(w, err, http.StatusBadRequest)
 			return
 		}
 		count += c
@@ -192,12 +206,8 @@ func reorderItem(pls playlists.Playlists) http.HandlerFunc {
 			return
 		}
 		err = pls.ReorderTrack(ctx, playlistId, id, newPos)
-		if errors.Is(err, model.ErrNotAuthorized) {
-			http.Error(w, err.Error(), http.StatusForbidden)
-			return
-		}
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusBadRequest)
+			writePlaylistError(w, err, http.StatusBadRequest)
 			return
 		}
 
diff --git a/server/nativeapi/playlists_test.go b/server/nativeapi/playlists_test.go
index 9bf502687..74ef58cab 100644
--- a/server/nativeapi/playlists_test.go
+++ b/server/nativeapi/playlists_test.go
@@ -183,6 +183,20 @@ var _ = Describe("Playlist Tracks Endpoint", func() {
 	})
 })
 
+var _ = Describe("writePlaylistError", func() {
+	DescribeTable("maps a service error to an HTTP status",
+		func(err error, expected int) {
+			w := httptest.NewRecorder()
+			writePlaylistError(w, err, http.StatusBadRequest)
+			Expect(w.Code).To(Equal(expected))
+		},
+		Entry("not found -> 404", model.ErrNotFound, http.StatusNotFound),
+		Entry("not authorized -> 403", model.ErrNotAuthorized, http.StatusForbidden),
+		Entry("not editable -> 409", model.ErrPlaylistNotEditable, http.StatusConflict),
+		Entry("unrecognized -> default", model.ErrValidation, http.StatusBadRequest),
+	)
+})
+
 type mockPlaylistTrackRepo struct {
 	model.PlaylistTrackRepository
 	tracks model.PlaylistTracks
diff --git a/server/nativeapi/translations_test.go b/server/nativeapi/translations_test.go
index 77c088f6f..1c641da77 100644
--- a/server/nativeapi/translations_test.go
+++ b/server/nativeapi/translations_test.go
@@ -5,12 +5,12 @@ import (
 	"io"
 	"io/fs"
 	"os"
+	"path"
 	"path/filepath"
 	"testing/fstest"
 
 	"github.com/navidrome/navidrome/consts"
 	"github.com/navidrome/navidrome/resources"
-	"github.com/navidrome/navidrome/tests"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
@@ -18,13 +18,12 @@ import (
 var _ = Describe("Translations", func() {
 	Describe("I18n files", func() {
 		It("contains only valid json language files", func() {
-			tests.SkipOnWindows("path separator bug (#TBD-path-sep-nativeapi)")
 			fsys := resources.FS()
 			dir, _ := fsys.Open(consts.I18nFolder)
 			files, _ := dir.(fs.ReadDirFile).ReadDir(-1)
 			for _, f := range files {
 				name := filepath.Base(f.Name())
-				filePath := filepath.Join(consts.I18nFolder, name)
+				filePath := path.Join(consts.I18nFolder, name)
 				file, _ := fsys.Open(filePath)
 				data, _ := io.ReadAll(file)
 				var out map[string]any
diff --git a/server/subsonic/api.go b/server/subsonic/api.go
index 173e318d4..852745698 100644
--- a/server/subsonic/api.go
+++ b/server/subsonic/api.go
@@ -316,7 +316,8 @@ func mapToSubsonicError(err error) subError {
 		err = newError(responses.ErrorGeneric, err.Error())
 	case errors.Is(err, model.ErrNotFound), errors.Is(err, rest.ErrNotFound):
 		err = newError(responses.ErrorDataNotFound, "data not found")
-	case errors.Is(err, model.ErrNotAuthorized), errors.Is(err, rest.ErrPermissionDenied):
+	case errors.Is(err, model.ErrNotAuthorized), errors.Is(err, rest.ErrPermissionDenied),
+		errors.Is(err, model.ErrPlaylistNotEditable): // Subsonic has no code for "read-only resource"
 		err = newError(responses.ErrorAuthorizationFail)
 	case errors.Is(err, stream.ErrTooManyTranscodes):
 		err = newError(responses.ErrorGeneric, "too many concurrent transcodes, please retry shortly")
diff --git a/server/subsonic/e2e/subsonic_artwork_test.go b/server/subsonic/e2e/subsonic_artwork_test.go
index 91520e7ef..a4f72cd9f 100644
--- a/server/subsonic/e2e/subsonic_artwork_test.go
+++ b/server/subsonic/e2e/subsonic_artwork_test.go
@@ -313,7 +313,7 @@ func newDummyImageCache(ctx context.Context) cache.FileCache {
 		func(context.Context, cache.Item) (io.Reader, error) {
 			return nil, errors.New("resize not exercised in subsonic artwork e2e")
 		})
-	Eventually(func() bool { return c.Available(ctx) }).Should(BeTrue())
+	Eventually(func() bool { return c.Available(ctx) }, 10*time.Second).Should(BeTrue())
 	return c
 }
 
diff --git a/server/subsonic/playlists.go b/server/subsonic/playlists.go
index bd53528d9..774a9c430 100644
--- a/server/subsonic/playlists.go
+++ b/server/subsonic/playlists.go
@@ -172,7 +172,7 @@ func buildOSPlaylist(ctx context.Context, p model.Playlist) *responses.OpenSubso
 		}
 	} else {
 		user, ok := request.UserFrom(ctx)
-		pls.Readonly = !ok || p.OwnerID != user.ID
+		pls.Readonly = !ok || p.OwnerID != user.ID || !p.TracksEditable()
 	}
 
 	return &pls
diff --git a/server/subsonic/playlists_test.go b/server/subsonic/playlists_test.go
index bd0b18b7d..57008640a 100644
--- a/server/subsonic/playlists_test.go
+++ b/server/subsonic/playlists_test.go
@@ -111,6 +111,15 @@ var _ = Describe("buildPlaylist", func() {
 				Expect(result.Public).To(BeTrue())
 				Expect(result.Readonly).To(BeFalse())
 			})
+
+			It("is read-only for a synced playlist even as owner", func() {
+				ctx = request.WithUser(ctx, model.User{ID: "1234", UserName: "admin"})
+				playlist.Sync = true
+
+				result := router.buildPlaylist(ctx, playlist)
+
+				Expect(result.Readonly).To(BeTrue())
+			})
 		})
 
 		Context("when minimal clients list is empty", func() {
diff --git a/ui/src/common/playlistUtils.js b/ui/src/common/playlistUtils.js
index 74a01d47a..2d0c745ff 100644
--- a/ui/src/common/playlistUtils.js
+++ b/ui/src/common/playlistUtils.js
@@ -12,4 +12,4 @@ export const isReadOnly = (ownerId) => {
 export const isSmartPlaylist = (pls) => !!pls.rules
 
 export const canChangeTracks = (pls) =>
-  isWritable(pls.ownerId) && !isSmartPlaylist(pls)
+  isWritable(pls.ownerId) && !isSmartPlaylist(pls) && !pls.sync
diff --git a/ui/src/common/playlistUtils.test.js b/ui/src/common/playlistUtils.test.js
index 2c671ecf5..345b6045d 100644
--- a/ui/src/common/playlistUtils.test.js
+++ b/ui/src/common/playlistUtils.test.js
@@ -74,5 +74,11 @@ describe('playlistUtils', () => {
       const playlist = { ownerId: 'user1', rules: [] }
       expect(canChangeTracks(playlist)).toBe(false)
     })
+
+    it('returns false if playlist is synced', () => {
+      localStorage.setItem('userId', 'user1')
+      const playlist = { ownerId: 'user1', sync: true }
+      expect(canChangeTracks(playlist)).toBe(false)
+    })
   })
 })
diff --git a/ui/src/dialogs/SelectPlaylistInput.jsx b/ui/src/dialogs/SelectPlaylistInput.jsx
index 847107523..2f040a7f7 100644
--- a/ui/src/dialogs/SelectPlaylistInput.jsx
+++ b/ui/src/dialogs/SelectPlaylistInput.jsx
@@ -16,7 +16,7 @@ import {
 import AddIcon from '@material-ui/icons/Add'
 import { useGetList, useTranslate } from 'react-admin'
 import PropTypes from 'prop-types'
-import { isWritable } from '../common'
+import { canChangeTracks } from '../common'
 import { makeStyles } from '@material-ui/core'
 
 const useStyles = makeStyles((theme) => ({
@@ -268,8 +268,7 @@ export const SelectPlaylistInput = ({ onChange }) => {
   )
 
   const options =
-    ids &&
-    ids.map((id) => data[id]).filter((option) => isWritable(option.ownerId))
+    ids && ids.map((id) => data[id]).filter((option) => canChangeTracks(option))
 
   // Filter playlists based on search text
   const filteredOptions =
diff --git a/ui/src/dialogs/SelectPlaylistInput.test.jsx b/ui/src/dialogs/SelectPlaylistInput.test.jsx
index 4ffcdf0b6..753d12c03 100644
--- a/ui/src/dialogs/SelectPlaylistInput.test.jsx
+++ b/ui/src/dialogs/SelectPlaylistInput.test.jsx
@@ -16,6 +16,7 @@ const mockPlaylists = [
   { id: 'playlist-2', name: 'Jazz Collection', ownerId: 'admin' },
   { id: 'playlist-3', name: 'Electronic Beats', ownerId: 'admin' },
   { id: 'playlist-4', name: 'Chill Vibes', ownerId: 'user2' }, // Not writable by admin
+  { id: 'playlist-5', name: 'Synced List', ownerId: 'admin', sync: true },
 ]
 
 const mockIndexedData = {
@@ -27,6 +28,12 @@ const mockIndexedData = {
     ownerId: 'admin',
   },
   'playlist-4': { id: 'playlist-4', name: 'Chill Vibes', ownerId: 'user2' },
+  'playlist-5': {
+    id: 'playlist-5',
+    name: 'Synced List',
+    ownerId: 'admin',
+    sync: true,
+  },
 }
 
 const createTestComponent = (
@@ -89,6 +96,8 @@ describe('SelectPlaylistInput', () => {
 
       // Should not show playlists not owned by admin (not writable)
       expect(screen.queryByText('Chill Vibes')).not.toBeInTheDocument()
+      // Should not show synced playlists (their tracks are not editable)
+      expect(screen.queryByText('Synced List')).not.toBeInTheDocument()
     })
 
     it('should filter playlists based on search input', async () => {