diff --git a/server/jellyfin/README.md b/server/jellyfin/README.md
index 7afc2b7a9..17d2797ab 100644
--- a/server/jellyfin/README.md
+++ b/server/jellyfin/README.md
@@ -22,6 +22,10 @@ Enabled = true
 ServerName = "My Music Server"
 # Optional: usernames to show in the client login user-picker (default: none). See "Public user list".
 ExposedPublicUsers = "alice, bob"
+# Optional: max collection responses streaming at once (default: half the DB connection pool,
+# min 2). Each streaming response holds a DB connection for its whole duration; excess requests
+# queue rather than fail.
+MaxConcurrentStreams = 4
 ```
 
 or via environment variables:
@@ -104,12 +108,14 @@ authenticated user has access to; a library (or item within it) the user cannot
 `GET /Items` accepts the filter params clients use to build screens: `ParentId` (a library view id
 for scoping, an artist id when browsing into an artist's albums, or an album id when browsing into
 an album's tracks); `AlbumArtistIds`/`ArtistIds`/`contributingArtistIds` (an artist's albums or
-tracks — Finamp's artist screen sends these *alongside* `ParentId=<libraryId>`); `GenreIds` (a
+tracks — Finamp's artist screen sends these *alongside* `ParentId=<libraryId>`); `AlbumIds` (an
+album's tracks — Feishin fetches them this way instead of `ParentId`); `GenreIds` (a
 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`;
-`StartIndex`/`Limit`; and `Ids` (batch fetch by id).
+`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).
 
 ## Implemented endpoints
 
@@ -124,9 +130,11 @@ favorites-only (`Filters=IsFavorite` or the standalone `isFavorite=true`); `Sort
 | Images | `GET Items/{itemId}/Images/{type}[/{index}]` (public), `POST`/`DELETE Items/{itemId}/Images/{type}` (playlist cover, authenticated) |
 | Favorites / ratings for songs, albums, artists, and playlists | `POST`/`DELETE UserFavoriteItems/{itemId}`, `POST`/`DELETE Users/{userId}/FavoriteItems/{itemId}`, `POST`/`DELETE Users/{userId}/Items/{itemId}/Rating`, `GET UserItems/{itemId}/UserData`, `GET Users/{userId}/Items/{itemId}/UserData` |
 | Streaming | `GET Audio/{itemId}/stream[.{container}]`, `GET Audio/{itemId}/universal`, `GET Audio/{itemId}/main.m3u8`, `GET Items/{itemId}/File`, `GET Items/{itemId}/Download`, `GET`/`POST Items/{itemId}/PlaybackInfo` |
+| Lyrics | `GET Audio/{itemId}/Lyrics` |
 | Playback reporting | `POST Sessions/Playing`, `POST Sessions/Playing/Progress`, `POST Sessions/Playing/Stopped`, `POST Sessions/Capabilities[/Full]` |
 | Playlists | `POST Playlists`, `GET Playlists/{playlistId}`, `POST Playlists/{playlistId}` (rename / visibility / replace tracks), `GET Playlists/{playlistId}/Items`, `POST`/`DELETE Playlists/{playlistId}/Items`, `GET Playlists/{playlistId}/Users[/{userId}]` |
 | Real-time | `GET socket` (WebSocket; keeps clients like Finamp from 404-loop-reconnecting) |
+| AudioMuse-AI (see below) | `GET AudioMuseAI/info`, `GET AudioMuseAI/health`, `GET AudioMuseAI/similar_tracks`, `GET AudioMuseAI/find_path` |
 
 Any other path returns a `404` with a `{}` JSON body, and is logged server-side at `Debug` level
 as `Jellyfin API: unhandled route` (method + path). If a client you're testing needs an endpoint
@@ -217,7 +225,9 @@ The stream endpoints reuse the same transcode-decision pipeline as the Subsonic
 
 ## AudioMuse-AI compatible endpoints
 
-Compatibility shim for Jellyfin front-ends that integrate [AudioMuse-AI](https://github.com/NeptuneHub/audiomuse-ai-plugin).
+Compatibility shim for Jellyfin front-ends that integrate [AudioMuse-AI](https://github.com/NeptuneHub/audiomuse-ai-plugin)
+— e.g. [Symfonium](https://symfonium.app/) can use these endpoints for sonic mixes when
+connected as a Jellyfin client.
 Backed natively by Navidrome's `core/sonic` engine (the `SonicSimilarity` plugin capability) — no
 external AudioMuse-AI backend or proxy is involved. The endpoints are gated on a `SonicSimilarity`
 plugin being loaded, like the Subsonic `sonicSimilarity` OpenSubsonic extension.
@@ -320,9 +330,6 @@ make test PKG=./server/jellyfin/...
   Access control for artists is enforced by scoping the `Artists`/`Items?IncludeItemTypes=MusicArtist`
   *list* to the user's libraries, plus the persistence layer's own defense-in-depth; a client
   that already has an artist id from elsewhere is not re-checked against library membership.
-- **MD5-hash ids from old migrated libraries.** The hex id codec assumes ids are opaque; a raw
-  32-char MD5 id is itself valid hex and so must be encoded/decoded symmetrically like any other.
-  This is handled, but is the most fragile id case — see the note in `dto/ids.go`.
 - **Blurhashes are synthetic, not computed from the artwork (follow-up).** `ImageBlurHashes` is
   populated by `dto/blurhash.go`, which derives a well-formed **1-component (solid color)**
   blurhash by hashing the item id — it never looks at the actual image. Real Jellyfin computes a
@@ -348,15 +355,8 @@ make test PKG=./server/jellyfin/...
   check — the column is never `""` post-scan), while `PlaybackInfo` runs the full pipeline per
   track so sidecar/plugin lyrics also light up. Feishin additionally requires server version
   ≥ 10.9 — the reason `jellyfinVersion` is 10.9.11.
-  Follow-ups: the lyrics cache loader is not singleflighted, so concurrent misses on the same
-  track can double-invoke the plugin pipeline (fix belongs in `utils/cache.SimpleCache` via
-  ttlcache's `SuppressedLoader`, affecting all callers — separate change); tracks whose only
-  lyrics are sidecar/plugin-sourced show no `HasLyrics` badge in lists (request-time sources
-  can't be known at list time without per-row I/O).
-- **No sonic similarity (follow-up).** `Items/{id}/InstantMix` and the `/Similar` endpoints are
-  backed only by external metadata agents (Last.fm), not sonic analysis: an instant mix is the seed
-  track followed by the provider's similar songs (with agents disabled it degrades to a seed-only
-  mix). A follow-up would back them with Navidrome's `core/sonic` provider — the same one behind
-  the OpenSubsonic `sonicSimilarity` extension (`getSonicSimilarTracks`) that AudioMuse-AI feeds
-  via its Navidrome plugin, and the exact endpoint AudioMuse's own Jellyfin plugin overrides.
-  Needs the `core/sonic.Sonic` service injected into the `Router` (wire change).
+  Concurrent misses on the same track share one pipeline invocation (`SimpleCache.GetWithLoader`
+  is singleflighted), and the load runs detached from the request context with a one-minute bound,
+  so a cancelled request or hung plugin can't fail or pin the load for other waiters.
+  Follow-up: tracks whose only lyrics are sidecar/plugin-sourced show no `HasLyrics` badge in
+  lists (request-time sources can't be known at list time without per-row I/O).