Merge pull request 'v2026.05.19.1 — hotfix: notification permission + full-player auto-minimize' (#54) from dev into main

Merge v2026.05.19.1 hotfix — notification permission + full-player auto-minimize (PR #54)

.forgejo/workflows/test-go.yml

@@ -4,8 +4,16 @@ name: test-go
 # dev/main and PRs to main, scoped to Go-side files only — web-only or
 # Flutter-only diffs don't trigger this workflow.
 #
-# Integration tests needing Postgres/ffmpeg run locally via docker-compose;
-# they should guard with testing.Short() so this short-mode run skips them.
+# Two jobs: `test` (fast — vet + lint + `go test -short -race`, no DB) and
+# `integration` (full `go test -race` against an ephemeral Postgres).
+#
+# Integration-job DB wiring follows the act_runner shared-daemon pattern:
+# the runner's Docker daemon also runs the operator's dev compose stack,
+# so service containers get NO published ports (collision) and no
+# service-name DNS. We discover the service container by the job-scoped
+# name filter via the mounted docker socket and reach it by bridge IP.
+# The exactly-one assertion is a hard guard — pointing tests at the dev
+# Postgres would truncate it (the disaster Fable #339 exists to prevent).
 #
 # `web/build/` has a committed placeholder index.html so go:embed succeeds
 # without needing the SPA to be freshly built. Real builds happen in
@@ -54,3 +62,63 @@ jobs:
 
       - name: go test (short, race)
         run: go test -short -race ./...
+
+  integration:
+    runs-on: go-ci
+    services:
+      postgres:
+        image: postgres:16-alpine
+        env:
+          POSTGRES_USER: minstrel
+          POSTGRES_PASSWORD: minstrel
+          POSTGRES_DB: minstrel_test
+        # No `ports:` — the runner shares the operator's dev compose
+        # Docker daemon; publishing a fixed host port collides.
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Integration suite (discover service by bridge IP, migrate, test)
+        run: |
+          set -eux
+          # Discover THIS job's Postgres service container via the
+          # mounted docker socket. act_runner attaches the job
+          # container and its service container(s) to a shared per-job
+          # network, so scope discovery to a postgres that sits on a
+          # network THIS job container is also on. The old
+          # `--filter name=integration` matched EVERY concurrent
+          # integration run's postgres (a dev push + the main-merge run
+          # overlap → 2 candidates → false "expected exactly 1" abort).
+          # The operator's dev compose `minstrel-postgres-*` is never on
+          # this job's network; skip it explicitly as belt-and-suspenders
+          # (a wrong target would truncate real data).
+          SELF=$(cat /etc/hostname)
+          SELF_NETS=$(docker inspect -f '{{range $k,$v := .NetworkSettings.Networks}}{{$k}} {{end}}' "$SELF")
+          test -n "$SELF_NETS"
+          echo "self ($SELF) networks: $SELF_NETS"
+          PG_ID=""
+          PG_NAME=""
+          for cid in $(docker ps --filter "ancestor=postgres:16-alpine" -q); do
+            nm=$(docker inspect -f '{{.Name}}' "$cid" | sed 's#^/##')
+            case "$nm" in *minstrel-postgres*|*_postgres_*) continue ;; esac
+            for net in $(docker inspect -f '{{range $k,$v := .NetworkSettings.Networks}}{{$k}} {{end}}' "$cid"); do
+              case " $SELF_NETS " in *" $net "*) PG_ID="$cid"; PG_NAME="$nm"; break 2 ;; esac
+            done
+          done
+          test -n "$PG_ID" || { echo "FATAL: no postgres service container on this job's network (self nets: $SELF_NETS)"; exit 1; }
+          echo "selected postgres: $PG_ID $PG_NAME"
+          PG_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$PG_ID")
+          test -n "$PG_IP"
+          export MINSTREL_TEST_DATABASE_URL="postgres://minstrel:minstrel@${PG_IP}:5432/minstrel_test?sslmode=disable"
+
+          # Wait for Postgres to accept TCP (no health-check dependency).
+          for i in $(seq 1 60); do (echo > "/dev/tcp/${PG_IP}/5432") 2>/dev/null && break; sleep 2; done
+
+          # Apply embedded migrations to the fresh test DB, then run the
+          # full suite (no -short → integration tests execute). -p 1:
+          # every integration package TRUNCATEs the one shared test DB;
+          # concurrent package binaries → TRUNCATE deadlocks. Serialize
+          # package execution (the documented local invocation too).
+          MINSTREL_DATABASE_URL="$MINSTREL_TEST_DATABASE_URL" go run ./cmd/minstrel migrate
+          go test -p 1 -race ./...

Makefile

@@ -1,4 +1,4 @@
-.PHONY: generate test test-short lint build
+.PHONY: generate test test-short test-integration lint build
 
 SQLC_VERSION := 1.31.1
 
@@ -11,6 +11,16 @@ test:
 test-short:
 	go test -short -race ./...
 
+# Full suite incl. integration tests, against the dedicated minstrel_test
+# DB so a run never truncates the dev `minstrel` DB (Fable #339). Ensures
+# the test DB exists (idempotent — createdb errors if present, ignored).
+test-integration:
+	docker compose up -d postgres
+	-docker compose exec -T postgres createdb -U minstrel minstrel_test
+	# -p 1: integration packages share one test DB and each TRUNCATEs it;
+	# concurrent package binaries deadlock on TRUNCATE. Serialize packages.
+	MINSTREL_TEST_DATABASE_URL=postgres://minstrel:minstrel@localhost:5432/minstrel_test?sslmode=disable go test -p 1 -race ./...
+
 lint:
 	golangci-lint run ./...
 

README.md

@@ -83,6 +83,16 @@ Two concurrent dev processes:
 1. **Backend:** `docker compose up` — Postgres + Minstrel on `:4533`.
 2. **Frontend:** `cd web && npm install && npm run dev` — Vite dev server on `:5173` with HMR. The Vite server proxies `/api/*` and `/rest/*` to `:4533` so session cookies work.
 
+### Testing
+
+- Unit + race (no DB): `make test-short`.
+- Full suite incl. integration tests: `make test-integration`. This runs
+  against a dedicated `minstrel_test` database so a test run never
+  truncates your dev `minstrel` data (admin user, library, likes). It
+  brings up the compose Postgres and creates the test DB if missing.
+- CI runs both: a fast `go test -short -race` gate plus an integration
+  job with its own ephemeral Postgres (`.forgejo/workflows/test-go.yml`).
+
 ### Production build
 
 `docker build -t minstrel .` runs the SvelteKit build inside a `node` stage, copies the output into the `golang` stage, and `//go:embed`s it into the final binary. The container serves the SPA from `/` alongside the API surfaces; no separate static-file server is required.

cmd/minstrel/admin.go

@@ -0,0 +1,129 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"flag"
+	"fmt"
+	"os"
+
+	"golang.org/x/crypto/bcrypt"
+
+	"git.fabledsword.com/bvandeusen/minstrel/internal/config"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/db"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/logging"
+)
+
+// runMigrate applies the embedded migrations and exits. The server also
+// auto-migrates on startup (main.go); this standalone path exists for CI
+// (provision a fresh DB before the integration suite) and operators who
+// want to migrate without starting the server.
+func runMigrate(args []string) error {
+	fs := flag.NewFlagSet("migrate", flag.ContinueOnError)
+	configPath := fs.String("config", os.Getenv("MINSTREL_CONFIG"), "path to YAML config file")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+	cfg, err := config.Load(*configPath)
+	if err != nil {
+		return fmt.Errorf("load config: %w", err)
+	}
+	logger, err := logging.New(os.Stdout, cfg.Log.Level, cfg.Log.Format)
+	if err != nil {
+		return fmt.Errorf("init logger: %w", err)
+	}
+	if err := db.Migrate(cfg.Database.URL, logger); err != nil {
+		return fmt.Errorf("migrate: %w", err)
+	}
+	fmt.Println("minstrel: migrations applied")
+	return nil
+}
+
+// runAdmin dispatches `minstrel admin <subcommand>`.
+func runAdmin(args []string) error {
+	if len(args) == 0 {
+		return errors.New("usage: minstrel admin reset-password [-user NAME] [-password PW] [-config PATH]")
+	}
+	switch args[0] {
+	case "reset-password":
+		return adminResetPassword(args[1:])
+	default:
+		return fmt.Errorf("unknown admin subcommand %q", args[0])
+	}
+}
+
+// adminResetPassword resets a user's credentials. It updates BOTH
+// password_hash (bcrypt, for /api/auth/login) and subsonic_password
+// (plaintext, required for Subsonic t+s token verification) so neither
+// auth path is left stale. Recovers a locked-out operator when the
+// bootstrap password was missed or the DB volume was recreated (Fable
+// #321) without DB surgery.
+func adminResetPassword(args []string) error {
+	fs := flag.NewFlagSet("admin reset-password", flag.ContinueOnError)
+	configPath := fs.String("config", os.Getenv("MINSTREL_CONFIG"), "path to YAML config file")
+	username := fs.String("user", "admin", "username to reset")
+	password := fs.String("password", "", "new password; if empty a strong one is generated and printed")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	cfg, err := config.Load(*configPath)
+	if err != nil {
+		return fmt.Errorf("load config: %w", err)
+	}
+	if cfg.Database.URL == "" {
+		return errors.New("no database URL configured (set it in the config file or MINSTREL_DATABASE_URL)")
+	}
+
+	ctx := context.Background()
+	pool, err := db.Open(ctx, cfg.Database.URL)
+	if err != nil {
+		return fmt.Errorf("open db: %w", err)
+	}
+	defer pool.Close()
+	q := dbq.New(pool)
+
+	user, err := q.GetUserByUsername(ctx, *username)
+	if err != nil {
+		return fmt.Errorf("look up user %q: %w", *username, err)
+	}
+
+	pw := *password
+	generated := false
+	if pw == "" {
+		b := make([]byte, 18)
+		if _, err := rand.Read(b); err != nil {
+			return fmt.Errorf("generate password: %w", err)
+		}
+		pw = base64.RawURLEncoding.EncodeToString(b)
+		generated = true
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(pw), bcrypt.DefaultCost)
+	if err != nil {
+		return fmt.Errorf("hash password: %w", err)
+	}
+	if err := q.ChangeUserPassword(ctx, dbq.ChangeUserPasswordParams{
+		ID:           user.ID,
+		PasswordHash: string(hash),
+	}); err != nil {
+		return fmt.Errorf("update password_hash: %w", err)
+	}
+	sp := pw
+	if err := q.SetSubsonicPassword(ctx, dbq.SetSubsonicPasswordParams{
+		ID:               user.ID,
+		SubsonicPassword: &sp,
+	}); err != nil {
+		return fmt.Errorf("update subsonic_password: %w", err)
+	}
+
+	if generated {
+		fmt.Printf("minstrel: password for %q reset.\nNew password: %s\n", *username, pw)
+	} else {
+		fmt.Printf("minstrel: password for %q reset.\n", *username)
+	}
+	return nil
+}

cmd/minstrel/main.go

@@ -16,6 +16,7 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/eventbus"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/library"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarr"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrconfig"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrrequests"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/logging"
@@ -29,6 +30,22 @@ import (
 )
 
 func main() {
+	if len(os.Args) > 1 {
+		switch os.Args[1] {
+		case "admin":
+			if err := runAdmin(os.Args[2:]); err != nil {
+				fmt.Fprintf(os.Stderr, "minstrel admin: %v\n", err)
+				os.Exit(1)
+			}
+			return
+		case "migrate":
+			if err := runMigrate(os.Args[2:]); err != nil {
+				fmt.Fprintf(os.Stderr, "minstrel migrate: %v\n", err)
+				os.Exit(1)
+			}
+			return
+		}
+	}
 	if err := run(); err != nil {
 		fmt.Fprintf(os.Stderr, "minstrel: %v\n", err)
 		os.Exit(1)
@@ -105,8 +122,8 @@ func run() error {
 				logger.With("component", "scan_run"),
 				library.RunScanConfig{
 					BackfillCap:     5000,
-					EnrichCap:       cfg.Library.CoverArtBackfillCap,
-					ArtistEnrichCap: cfg.Library.CoverArtBackfillCap,
+					EnrichCap:       -1, // #388: no global cap; per-provider rate limits
+					ArtistEnrichCap: -1,
 					DataDir:         cfg.Storage.DataDir,
 				},
 			); err != nil {
@@ -122,8 +139,8 @@ func run() error {
 				logger.With("component", "scan_run"),
 				library.RunScanConfig{
 					BackfillCap:     5000,
-					EnrichCap:       cfg.Library.CoverArtBackfillCap,
-					ArtistEnrichCap: cfg.Library.CoverArtBackfillCap,
+					EnrichCap:       -1, // #388: no global cap; per-provider rate limits
+					ArtistEnrichCap: -1,
 					DataDir:         cfg.Storage.DataDir,
 				},
 			); err != nil {
@@ -157,7 +174,18 @@ func run() error {
 	// threading the bus through RunScan + TryStartScan + the Scheduler
 	// + every test caller. Per-process singleton, set once at startup.
 	library.SetEventBus(bus)
-	lidarrReconciler := lidarrrequests.NewReconciler(pool, lidarrCfg, logger.With("component", "lidarr"), bus)
+	// Per-tick Lidarr client factory: re-reads config so an admin save
+	// takes effect without a restart, returning nil while Lidarr is
+	// disabled/unconfigured. Mirrors server.go's lidarrClientFn; the
+	// reconciler uses it to (re)send unconfirmed adds.
+	lidarrClientFn := func() *lidarr.Client {
+		c, cerr := lidarrCfg.Get(ctx)
+		if cerr != nil || !c.Enabled || c.BaseURL == "" || c.APIKey == "" {
+			return nil
+		}
+		return lidarr.NewClient(c.BaseURL, c.APIKey)
+	}
+	lidarrReconciler := lidarrrequests.NewReconciler(pool, lidarrCfg, lidarrClientFn, logger.With("component", "lidarr"), bus)
 	go lidarrReconciler.Run(ctx)
 
 	// library_changes compactor (#357 follow-up). Daily tick; deletes
@@ -194,8 +222,8 @@ func run() error {
 
 	scanCfg := library.RunScanConfig{
 		BackfillCap:     5000,
-		EnrichCap:       cfg.Library.CoverArtBackfillCap,
-		ArtistEnrichCap: cfg.Library.CoverArtBackfillCap,
+		EnrichCap:       -1, // #388: no global cap; per-provider rate limits
+		ArtistEnrichCap: -1,
 		DataDir:         cfg.Storage.DataDir,
 	}
 	scheduler := library.NewScheduler(pool, logger.With("component", "scheduler"),
@@ -203,7 +231,7 @@ func run() error {
 	scheduler.Start(ctx)
 	srv := server.New(logger, pool, scanner, subsonic.Config{
 		AllowPlaintextPassword: cfg.Subsonic.AllowPlaintextPassword,
-	}, cfg.Events, cfg.Recommendation, cfg.Storage.DataDir, cfg.Branding, coverEnricher, cfg.Library.CoverArtBackfillCap, coverSettings, scanner, scanCfg, scheduler)
+	}, cfg.Events, cfg.Recommendation, cfg.Storage.DataDir, cfg.Branding, coverEnricher, coverSettings, scanner, scanCfg, scheduler)
 	srv.Bus = bus
 	srv.PlaylistScheduler = playlistScheduler
 	httpServer := &http.Server{

deploy/initdb/01-create-test-db.sql

@@ -0,0 +1,6 @@
+-- Runs once, only on a fresh Postgres data volume (Docker entrypoint
+-- initdb hook). Creates the dedicated integration-test database so
+-- `go test` never truncates the operator's dev `minstrel` DB (Fable
+-- #339). For an already-initialised volume this script does NOT run;
+-- `make test-integration` creates the DB idempotently instead.
+CREATE DATABASE minstrel_test OWNER minstrel;

docker-compose.yml

@@ -1,10 +1,14 @@
 version: "3.9"
 
 # Local development environment for Minstrel.
-# Not used by CI — integration tests run against this compose stack manually:
-#   docker compose up -d postgres
-#   MINSTREL_TEST_DATABASE_URL=postgres://minstrel:minstrel@localhost:5432/minstrel?sslmode=disable \
-#       go test ./...
+#
+# Integration tests run against a SEPARATE database (minstrel_test) so a
+# test run never truncates the dev `minstrel` DB (Fable #339). Use the
+# Makefile target, which ensures the test DB exists then points the
+# tests at it:
+#   make test-integration
+# (CI runs the same suite against its own ephemeral Postgres service —
+# see .forgejo/workflows/test-go.yml.)
 #
 # Full stack (server + db):
 #   docker compose up --build
@@ -22,6 +26,9 @@ services:
     #   - "5432:5432"
     volumes:
       - minstrel-pgdata:/var/lib/postgresql/data
+      # Creates minstrel_test on a fresh volume (Fable #339). No-op on
+      # an existing volume — make test-integration ensures it instead.
+      - ./deploy/initdb:/docker-entrypoint-initdb.d:ro
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U minstrel -d minstrel"]
       interval: 5s

flutter_client/android/app/src/main/res/drawable/ic_stat_favorite.xml

@@ -0,0 +1,11 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#FFFFFFFF">
+  <!-- Lucide "heart" (filled) — same path verbatim from lucide-icons/lucide -->
+  <path
+      android:fillColor="#FFFFFFFF"
+      android:pathData="M2 9.5a5.5 5.5 0 0 1 9.591 -3.676 .56 .56 0 0 0 .818 0A5.49 5.49 0 0 1 22 9.5c0 2.29 -1.5 4 -3 5.5l-5.492 5.313a2 2 0 0 1 -3 .019L5 15c-1.5 -1.5 -3 -3.2 -3 -5.5"/>
+</vector>

flutter_client/android/app/src/main/res/drawable/ic_stat_favorite_border.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#FFFFFFFF">
+  <!-- Lucide "heart" (outline) — path verbatim from lucide-icons/lucide -->
+  <path
+      android:strokeColor="#FFFFFFFF"
+      android:strokeWidth="2"
+      android:strokeLineCap="round"
+      android:strokeLineJoin="round"
+      android:fillColor="#00000000"
+      android:pathData="M2 9.5a5.5 5.5 0 0 1 9.591 -3.676 .56 .56 0 0 0 .818 0A5.49 5.49 0 0 1 22 9.5c0 2.29 -1.5 4 -3 5.5l-5.492 5.313a2 2 0 0 1 -3 .019L5 15c-1.5 -1.5 -3 -3.2 -3 -5.5"/>
+</vector>

flutter_client/lib/admin/admin_landing_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -34,7 +35,7 @@ class AdminLandingScreen extends ConsumerWidget {
               children: [
                 AdminSectionCard(
                   key: const Key('admin_card_requests'),
-                  icon: Icons.inbox,
+                  icon: LucideIcons.inbox,
                   title: 'Requests',
                   subtitle: 'Approve or reject Lidarr requests',
                   count: c.requests,
@@ -42,7 +43,7 @@ class AdminLandingScreen extends ConsumerWidget {
                 ),
                 AdminSectionCard(
                   key: const Key('admin_card_quarantine'),
-                  icon: Icons.warning_amber,
+                  icon: LucideIcons.triangle_alert,
                   title: 'Quarantine',
                   subtitle: 'Resolve scan failures',
                   count: c.quarantine,
@@ -50,7 +51,7 @@ class AdminLandingScreen extends ConsumerWidget {
                 ),
                 AdminSectionCard(
                   key: const Key('admin_card_users'),
-                  icon: Icons.people,
+                  icon: LucideIcons.users,
                   title: 'Users',
                   subtitle: 'Manage accounts and invites',
                   count: c.users,

flutter_client/lib/admin/admin_users_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
@@ -59,7 +60,7 @@ class AdminUsersScreen extends ConsumerWidget {
                 trailing: TextButton.icon(
                   key: const Key('invite_generate_button'),
                   onPressed: () => _showGenerateInvite(context, ref),
-                  icon: Icon(Icons.add, color: fs.parchment),
+                  icon: Icon(LucideIcons.plus, color: fs.parchment),
                   label: Text('Generate',
                       style: TextStyle(color: fs.parchment)),
                 ),

flutter_client/lib/admin/widgets/admin_quarantine_row.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 
 import '../../models/admin_quarantine_item.dart';
 import '../../theme/theme_extension.dart';
@@ -45,7 +46,7 @@ class AdminQuarantineRow extends StatelessWidget {
       ),
       trailing: PopupMenuButton<String>(
         key: Key('admin_quarantine_menu_${item.trackId}'),
-        icon: Icon(Icons.more_vert, color: fs.parchment),
+        icon: Icon(LucideIcons.ellipsis_vertical, color: fs.parchment),
         onSelected: (action) async {
           switch (action) {
             case 'resolve':

flutter_client/lib/admin/widgets/admin_user_row.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 
 import '../../models/admin_user.dart';
 import '../../theme/theme_extension.dart';
@@ -29,7 +30,7 @@ class AdminUserRow extends StatelessWidget {
             _Badge(label: 'auto-approve', color: fs.moss),
         ],
       ),
-      trailing: Icon(Icons.chevron_right, color: fs.ash),
+      trailing: Icon(LucideIcons.chevron_right, color: fs.ash),
       onTap: onTap,
     );
   }

flutter_client/lib/admin/widgets/invite_row.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter/services.dart';
 
 import '../../models/invite.dart';
@@ -31,7 +32,7 @@ class InviteRow extends StatelessWidget {
             ),
           ),
           IconButton(
-            icon: Icon(Icons.copy, color: fs.ash, size: 18),
+            icon: Icon(LucideIcons.copy, color: fs.ash, size: 18),
             tooltip: 'Copy',
             onPressed: () =>
                 Clipboard.setData(ClipboardData(text: invite.token)),
@@ -63,7 +64,7 @@ class InviteRow extends StatelessWidget {
         ],
       ),
       trailing: IconButton(
-        icon: Icon(Icons.delete_outline, color: fs.oxblood),
+        icon: Icon(LucideIcons.trash_2, color: fs.oxblood),
         tooltip: 'Revoke',
         onPressed: onRevoke,
       ),

flutter_client/lib/api/endpoints/discover.dart

@@ -1,11 +1,25 @@
 import 'package:dio/dio.dart';
 
+import '../../models/artist_suggestion.dart';
 import '../../models/lidarr.dart';
 
 class DiscoverApi {
   DiscoverApi(this._dio);
   final Dio _dio;
 
+  /// GET /api/discover/suggestions — out-of-library artist suggestions
+  /// (ListenBrainz-derived; image_url resolved on-demand from Lidarr,
+  /// may be empty). The server already filters in-library and
+  /// non-terminal-request candidates.
+  Future<List<ArtistSuggestion>> listSuggestions() async {
+    final r = await _dio.get<List<dynamic>>('/api/discover/suggestions');
+    final raw = r.data ?? const [];
+    return raw
+        .map((e) =>
+            ArtistSuggestion.fromJson((e as Map).cast<String, dynamic>()))
+        .toList(growable: false);
+  }
+
   /// GET /api/lidarr/search?q=...&kind=artist|album|track. Server has a
   /// 60s LRU cache for repeat queries so re-typing the same string in
   /// quick succession is cheap.

flutter_client/lib/app.dart

@@ -1,13 +1,18 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:permission_handler/permission_handler.dart';
 
 import 'cache/cache_filler.dart';
 import 'cache/metadata_prefetcher.dart';
 import 'cache/offline_provider.dart';
 import 'cache/mutation_queue.dart';
 import 'cache/prefetcher.dart';
+import 'cache/resume_controller.dart';
 import 'cache/sync_controller.dart';
 import 'player/play_events_reporter.dart';
+import 'player/playback_error_reporter.dart';
 import 'shared/live_events_dispatcher.dart';
 import 'shared/routing.dart';
 import 'theme/theme_data.dart';
@@ -62,10 +67,27 @@ class _MinstrelAppState extends ConsumerState<MinstrelApp> {
       // scoring, scrobbles, and system-playlist rotation, and is the
       // path that carries the `source` tag for #415.
       ref.read(playEventsReporterProvider);
+      // Resume-on-launch (#54): restores the last persisted session
+      // (paused) and persists queue/index/position on track change,
+      // pause, and app teardown. Pairs with the #52 idle teardown so a
+      // torn-down session is recoverable instead of lost.
+      ref.read(resumeControllerProvider);
+      // Playback-error reporter (#58): turns the handler's silent
+      // dead-track skips into a debounced/coalesced SnackBar so a
+      // vanished track isn't mysterious (and aids server/cache debug).
+      ref.read(playbackErrorReporterProvider);
       // Offline marker (#427 S1): periodic /healthz reachability
       // probe → offlineProvider. Read here to start the poller; S4
       // gates system-playlist play + Shuffle-all on it.
       ref.read(offlineProvider);
+      // POST_NOTIFICATIONS (Android 13+) is denied-by-default until
+      // requested; without it the media notification is silently
+      // suppressed on physical devices. One-shot, post-first-frame so
+      // it never blocks launch; no-op on <13 / once already decided.
+      if (Platform.isAndroid) {
+        // ignore: unawaited_futures
+        Permission.notification.request();
+      }
     });
   }
 
@@ -75,6 +97,7 @@ class _MinstrelAppState extends ConsumerState<MinstrelApp> {
     final mode = ref.watch(themeModeProvider).value ?? AppThemeMode.system;
     return MaterialApp.router(
       title: 'Minstrel',
+      scaffoldMessengerKey: scaffoldMessengerKey,
       theme: buildLightTheme(),
       darkTheme: buildDarkTheme(),
       themeMode: mode.materialMode,

flutter_client/lib/cache/db.dart

@@ -230,6 +230,20 @@ class CachedQuarantineMine extends Table {
   Set<Column> get primaryKey => {trackId};
 }
 
+/// Single-row snapshot of the last playback session — queue (TrackRef
+/// JSON), current index, position, and #415 source. Lets a torn-down
+/// session (the #52 idle/dismissed teardown) resume on next launch;
+/// without it the headset / lock-screen play button has nothing to
+/// resume. Mirrors the CachedHomeSnapshot single-row JSON pattern.
+/// Schema 10+.
+class CachedResumeState extends Table {
+  IntColumn get id => integer().withDefault(const Constant(1))();
+  TextColumn get json => text()();
+  DateTimeColumn get updatedAt => dateTime().withDefault(currentDateAndTime)();
+  @override
+  Set<Column> get primaryKey => {id};
+}
+
 enum CacheSource { manual, autoLiked, autoPlaylist, autoPrefetch, incidental }
 
 @DriftDatabase(tables: [
@@ -247,12 +261,13 @@ enum CacheSource { manual, autoLiked, autoPlaylist, autoPrefetch, incidental }
   CachedHomeIndex,
   CachedSystemPlaylistsStatus,
   CachedMutations,
+  CachedResumeState,
 ])
 class AppDb extends _$AppDb {
   AppDb([QueryExecutor? e]) : super(e ?? driftDatabase(name: 'minstrel_cache'));
 
   @override
-  int get schemaVersion => 9;
+  int get schemaVersion => 10;
 
   @override
   MigrationStrategy get migration => MigrationStrategy(
@@ -316,6 +331,12 @@ class AppDb extends _$AppDb {
               'UPDATE audio_cache_index SET last_played_at = cached_at',
             );
           }
+          if (from < 10) {
+            // Schema 10 (#54): cached_resume_state — single-row last-
+            // session snapshot for resume-on-launch. Empty on upgrade;
+            // first persist populates it.
+            await m.createTable(cachedResumeState);
+          }
         },
       );
 }

flutter_client/lib/cache/resume_controller.dart

@@ -0,0 +1,183 @@
+// Resume-on-launch (#54). The #52 teardown tears the audio_service
+// session down (and clears mediaItem) when idle/dismissed, so the
+// headset / lock-screen play button otherwise has nothing to resume.
+// This controller persists the live queue + index + position + #415
+// source to a single-row drift snapshot on track change / pause / app
+// teardown, and on construction restores the last snapshot into the
+// handler PAUSED (the user sees their last track and continues with
+// play / a media button — we never auto-blast on launch).
+//
+// Persist guard: when the handler clears (teardown → mediaItem null /
+// empty queue) we deliberately do NOT write, so the last good snapshot
+// survives for the next launch — that survival is the whole point.
+
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:drift/drift.dart' as drift;
+import 'package:flutter/widgets.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../auth/auth_provider.dart';
+import '../models/track.dart';
+import '../player/player_provider.dart';
+import 'audio_cache_manager.dart' show appDbProvider;
+import 'db.dart';
+
+class ResumeController with WidgetsBindingObserver {
+  ResumeController(this._ref);
+  final Ref _ref;
+
+  final _subs = <StreamSubscription<dynamic>>[];
+  Timer? _debounce;
+  bool _disposed = false;
+
+  Future<void> start() async {
+    try {
+      // audioHandlerProvider throws until main() overrides it (the real
+      // app always does). In tests / no-audio environments there's
+      // nothing to resume — stay inert.
+      _ref.read(audioHandlerProvider);
+    } catch (_) {
+      return;
+    }
+    if (_disposed) return;
+    await _restore();
+    if (_disposed) return;
+    final h = _ref.read(audioHandlerProvider);
+    // Media-button-when-torn-down hook (#448): play() invokes this when
+    // mediaItem is null so a headset/watch press resumes the snapshot.
+    h.setResumeHook(resumeFromMediaButton);
+    _subs.add(h.mediaItem.listen((_) => _schedulePersist()));
+    _subs.add(h.playbackState.listen((_) => _schedulePersist()));
+    WidgetsBinding.instance.addObserver(this);
+  }
+
+  void _schedulePersist() {
+    if (_disposed) return;
+    _debounce?.cancel();
+    _debounce = Timer(const Duration(seconds: 3), () {
+      unawaited(_persist());
+    });
+  }
+
+  Future<void> _persist() async {
+    if (_disposed) return;
+    try {
+      final h = _ref.read(audioHandlerProvider);
+      final tracks = h.queuedTracks;
+      final mi = h.mediaItem.value;
+      // Cleared by teardown — keep the last good snapshot for next
+      // launch rather than wiping it with an empty queue.
+      if (tracks.isEmpty || mi == null) return;
+      var idx = tracks.indexWhere((t) => t.id == mi.id);
+      if (idx < 0) idx = 0;
+      final blob = jsonEncode({
+        'v': 1,
+        'source': h.queueSource,
+        'index': idx,
+        'position_ms': h.position.inMilliseconds,
+        'tracks': tracks.map((t) => t.toJson()).toList(),
+      });
+      final db = _ref.read(appDbProvider);
+      await db.into(db.cachedResumeState).insertOnConflictUpdate(
+            CachedResumeStateCompanion.insert(
+              json: blob,
+              updatedAt: drift.Value(DateTime.now()),
+            ),
+          );
+    } catch (e, st) {
+      debugPrint('resume_controller: persist failed: $e\n$st');
+    }
+  }
+
+  /// Launch path: restore the last session PAUSED (no auto-blast).
+  Future<void> _restore() async {
+    try {
+      await _loadAndRestore();
+    } catch (e, st) {
+      debugPrint('resume_controller: restore failed: $e\n$st');
+    }
+  }
+
+  /// Media-button path (#448): the user pressed play on the headset /
+  /// watch / lock screen while the session was fully torn down (#52) and
+  /// nothing is loaded. Restore the snapshot, then START playback (they
+  /// asked to play). Registered as the handler's resume hook in start().
+  /// No-op if there's nothing to resume.
+  Future<void> resumeFromMediaButton() async {
+    try {
+      if (await _loadAndRestore()) {
+        await _ref.read(audioHandlerProvider).play();
+      }
+    } catch (e, st) {
+      debugPrint('resume_controller: media-button resume failed: $e\n$st');
+    }
+  }
+
+  /// Shared loader. Restores the last persisted session PAUSED and
+  /// returns whether it actually restored a queue. Guards: an already-
+  /// active session (don't stomp), missing auth, no/empty snapshot.
+  Future<bool> _loadAndRestore() async {
+    final h = _ref.read(audioHandlerProvider);
+    if (h.mediaItem.value != null) return false;
+    final url = await _ref.read(serverUrlProvider.future);
+    final token =
+        await _ref.read(secureStorageProvider).read(key: 'session_token');
+    if (url == null || url.isEmpty || token == null || token.isEmpty) {
+      return false;
+    }
+    final db = _ref.read(appDbProvider);
+    final row = await db.select(db.cachedResumeState).getSingleOrNull();
+    if (row == null) return false;
+    final m = jsonDecode(row.json) as Map<String, dynamic>;
+    final rawTracks = (m['tracks'] as List?) ?? const [];
+    final tracks = rawTracks
+        .map((e) => TrackRef.fromJson(e as Map<String, dynamic>))
+        .toList();
+    if (tracks.isEmpty) return false;
+    final idx = (m['index'] as num?)?.toInt() ?? 0;
+    final posMs = (m['position_ms'] as num?)?.toInt() ?? 0;
+    final source = m['source'] as String?;
+    await _ref.read(playerActionsProvider).restoreQueue(
+          tracks,
+          initialIndex: idx,
+          position: Duration(milliseconds: posMs),
+          source: source,
+        );
+    return true;
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    // App backgrounded / killed: persist durably right now (the debounce
+    // may not fire before teardown).
+    if (state == AppLifecycleState.paused ||
+        state == AppLifecycleState.detached) {
+      _debounce?.cancel();
+      unawaited(_persist());
+    }
+  }
+
+  void dispose() {
+    _disposed = true;
+    _debounce?.cancel();
+    WidgetsBinding.instance.removeObserver(this);
+    for (final s in _subs) {
+      s.cancel();
+    }
+    _subs.clear();
+  }
+}
+
+/// Read once at app start (app.dart postFrame). On construction it
+/// restores the last persisted session (paused) then persists
+/// queue/index/position on track change, pause, and app teardown.
+/// Disposed via ref.onDispose when the scope tears down.
+final resumeControllerProvider = Provider<ResumeController>((ref) {
+  final c = ResumeController(ref);
+  ref.onDispose(c.dispose);
+  // ignore: unawaited_futures
+  c.start();
+  return c;
+});

flutter_client/lib/discover/discover_screen.dart

@@ -1,6 +1,7 @@
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -8,6 +9,7 @@ import '../api/endpoints/discover.dart';
 import '../api/errors.dart';
 import '../cache/mutation_queue.dart';
 import '../library/library_providers.dart' show dioProvider;
+import '../models/artist_suggestion.dart';
 import '../models/lidarr.dart';
 import '../shared/widgets/main_app_bar_actions.dart';
 import '../theme/theme_extension.dart';
@@ -27,6 +29,22 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
   final _ctrl = TextEditingController();
   LidarrRequestKind _kind = LidarrRequestKind.artist;
   Future<List<LidarrSearchResult>>? _resultsFuture;
+  // Default (empty-search) surface: LB-derived out-of-library artist
+  // suggestions, mirroring web's SuggestionFeed.
+  Future<List<ArtistSuggestion>>? _suggestionsFuture;
+  final _requested = <String>{};
+
+  @override
+  void initState() {
+    super.initState();
+    _loadSuggestions();
+    // Clearing the box returns to suggestions (web swaps live too).
+    _ctrl.addListener(() {
+      if (_ctrl.text.trim().isEmpty && _resultsFuture != null) {
+        setState(() => _resultsFuture = null);
+      }
+    });
+  }
 
   @override
   void dispose() {
@@ -34,6 +52,55 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
     super.dispose();
   }
 
+  // Assigns the future only; callers trigger the rebuild (initState
+  // runs before first build, so setState here would be a no-op/warn).
+  void _loadSuggestions() {
+    _suggestionsFuture = ref
+        .read(_discoverApiProvider.future)
+        .then((api) => api.listSuggestions());
+  }
+
+  Future<void> _requestSuggestion(ArtistSuggestion s) async {
+    final fs = Theme.of(context).extension<FabledSwordTheme>()!;
+    final args = {
+      'kind': LidarrRequestKind.artist.wire,
+      'artistMbid': s.mbid,
+      'artistName': s.name,
+      'albumMbid': null,
+      'albumTitle': null,
+    };
+    try {
+      final api = await ref.read(_discoverApiProvider.future);
+      await api.createRequest(
+        kind: LidarrRequestKind.artist,
+        artistMbid: s.mbid,
+        artistName: s.name,
+      );
+      if (mounted) {
+        // Reassign the future first; the setState below rebuilds and
+        // the FutureBuilder picks up the fresh fetch (server now
+        // filters this candidate out). _requested hides it meanwhile.
+        _loadSuggestions();
+        setState(() => _requested.add(s.mbid));
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+          content: Text('Requested: ${s.name}'),
+          backgroundColor: fs.iron,
+        ));
+      }
+    } on DioException catch (_) {
+      await ref
+          .read(mutationQueueProvider)
+          .enqueue(MutationKinds.requestCreate, args);
+      if (mounted) {
+        setState(() => _requested.add(s.mbid));
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+          content: Text('Request queued: ${s.name}'),
+          backgroundColor: fs.iron,
+        ));
+      }
+    }
+  }
+
   void _runSearch() {
     final q = _ctrl.text.trim();
     if (q.isEmpty) {
@@ -101,7 +168,7 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
         backgroundColor: fs.obsidian,
         elevation: 0,
         leading: IconButton(
-          icon: Icon(Icons.arrow_back, color: fs.parchment),
+          icon: Icon(LucideIcons.arrow_left, color: fs.parchment),
           onPressed: () => context.pop(),
         ),
         title: Text('Discover', style: TextStyle(color: fs.parchment)),
@@ -127,7 +194,7 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
                     borderSide: BorderSide(color: fs.accent),
                   ),
                   suffixIcon: IconButton(
-                    icon: Icon(Icons.search, color: fs.ash),
+                    icon: Icon(LucideIcons.search, color: fs.ash),
                     onPressed: _runSearch,
                   ),
                 ),
@@ -153,13 +220,7 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
         ),
         Expanded(
           child: _resultsFuture == null
-              ? Center(
-                  child: Text(
-                    'Type to search, then tap Request to send to Lidarr.',
-                    textAlign: TextAlign.center,
-                    style: TextStyle(color: fs.ash),
-                  ),
-                )
+              ? _buildSuggestions(fs)
               : FutureBuilder<List<LidarrSearchResult>>(
                   future: _resultsFuture,
                   builder: (ctx, snap) {
@@ -199,6 +260,62 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
       ]),
     );
   }
+
+  Widget _buildSuggestions(FabledSwordTheme fs) {
+    return FutureBuilder<List<ArtistSuggestion>>(
+      future: _suggestionsFuture,
+      builder: (ctx, snap) {
+        if (snap.connectionState != ConnectionState.done) {
+          return const Center(child: CircularProgressIndicator());
+        }
+        final items = (snap.data ?? const <ArtistSuggestion>[])
+            .where((s) => !_requested.contains(s.mbid))
+            .toList(growable: false);
+        return ListView(
+          padding: const EdgeInsets.only(bottom: 16),
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(16, 12, 16, 4),
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text('Suggested for you',
+                      style: TextStyle(
+                          color: fs.parchment,
+                          fontSize: 20,
+                          fontWeight: FontWeight.w500)),
+                  const SizedBox(height: 2),
+                  Text(
+                    "Out-of-library artists drawn from what you've liked and played.",
+                    style: TextStyle(color: fs.ash, fontSize: 13),
+                  ),
+                ],
+              ),
+            ),
+            if (snap.hasError)
+              Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text("Couldn't load suggestions.",
+                    style: TextStyle(color: fs.ash)),
+              )
+            else if (items.isEmpty)
+              Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text(
+                  'Listen to something or like an artist to start getting suggestions.',
+                  style: TextStyle(color: fs.ash),
+                ),
+              )
+            else
+              ...items.map((s) => _SuggestionTile(
+                    s: s,
+                    onRequest: () => _requestSuggestion(s),
+                  )),
+          ],
+        );
+      },
+    );
+  }
 }
 
 class _ResultTile extends StatelessWidget {
@@ -220,14 +337,14 @@ class _ResultTile extends StatelessWidget {
             height: 56,
             color: fs.slate,
             child: row.imageUrl.isEmpty
-                ? Icon(Icons.album, color: fs.ash)
+                ? Icon(LucideIcons.disc_3, color: fs.ash)
                 : CachedNetworkImage(
                     imageUrl: row.imageUrl,
                     fit: BoxFit.cover,
                     fadeInDuration: const Duration(milliseconds: 120),
                     fadeOutDuration: Duration.zero,
                     errorWidget: (_, __, ___) =>
-                        Icon(Icons.album, color: fs.ash),
+                        Icon(LucideIcons.disc_3, color: fs.ash),
                   ),
           ),
         ),
@@ -284,3 +401,63 @@ class _Pill extends StatelessWidget {
     );
   }
 }
+
+class _SuggestionTile extends StatelessWidget {
+  const _SuggestionTile({required this.s, required this.onRequest});
+  final ArtistSuggestion s;
+  final VoidCallback onRequest;
+
+  @override
+  Widget build(BuildContext context) {
+    final fs = Theme.of(context).extension<FabledSwordTheme>()!;
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+      child: Row(children: [
+        ClipRRect(
+          borderRadius: BorderRadius.circular(6),
+          child: Container(
+            width: 56,
+            height: 56,
+            color: fs.slate,
+            child: s.imageUrl.isEmpty
+                ? Icon(LucideIcons.user, color: fs.ash)
+                : CachedNetworkImage(
+                    imageUrl: s.imageUrl,
+                    fit: BoxFit.cover,
+                    fadeInDuration: const Duration(milliseconds: 120),
+                    fadeOutDuration: Duration.zero,
+                    errorWidget: (_, __, ___) =>
+                        Icon(LucideIcons.user, color: fs.ash),
+                  ),
+          ),
+        ),
+        const SizedBox(width: 12),
+        Expanded(
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(s.name,
+                  maxLines: 1,
+                  overflow: TextOverflow.ellipsis,
+                  style: TextStyle(color: fs.parchment, fontSize: 14)),
+              if (s.attributionText.isNotEmpty)
+                Text(s.attributionText,
+                    maxLines: 2,
+                    overflow: TextOverflow.ellipsis,
+                    style: TextStyle(color: fs.ash, fontSize: 12)),
+            ],
+          ),
+        ),
+        const SizedBox(width: 8),
+        FilledButton(
+          onPressed: onRequest,
+          style: FilledButton.styleFrom(
+            backgroundColor: fs.accent,
+            foregroundColor: fs.parchment,
+          ),
+          child: const Text('Request'),
+        ),
+      ]),
+    );
+  }
+}

flutter_client/lib/library/album_detail_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../api/endpoints/likes.dart';
@@ -115,7 +116,7 @@ class AlbumDetailScreen extends ConsumerWidget {
                     width: 48, height: 48,
                     decoration: BoxDecoration(color: fs.accent, shape: BoxShape.circle),
                     child: IconButton(
-                      icon: Icon(Icons.play_arrow, color: fs.parchment),
+                      icon: Icon(LucideIcons.play, color: fs.parchment),
                       onPressed: () => ref.read(playerActionsProvider).playTracks(r.tracks),
                     ),
                   ),

flutter_client/lib/library/artist_detail_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -90,7 +91,7 @@ class ArtistDetailScreen extends ConsumerWidget {
                 width: 48, height: 48,
                 decoration: BoxDecoration(color: fs.accent, shape: BoxShape.circle),
                 child: IconButton(
-                  icon: Icon(Icons.play_arrow, color: fs.parchment),
+                  icon: Icon(LucideIcons.play, color: fs.parchment),
                   onPressed: () async {
                     try {
                       final tracks =

flutter_client/lib/library/home_screen.dart

@@ -1,5 +1,6 @@
 import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -245,12 +246,12 @@ class _PlaylistsSection extends StatelessWidget {
       if (offline) ...const [
         _OfflinePoolCard(
           label: 'Recently played',
-          icon: Icons.history,
+          icon: LucideIcons.history,
           kind: _OfflinePoolKind.recentlyPlayed,
         ),
         _OfflinePoolCard(
           label: 'Liked',
-          icon: Icons.favorite,
+          icon: LucideIcons.heart,
           kind: _OfflinePoolKind.liked,
         ),
       ],

flutter_client/lib/library/library_screen.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 
 import 'package:drift/drift.dart' as drift;
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -382,7 +383,7 @@ class _LibraryScreenState extends ConsumerState<LibraryScreen>
           IconButton(
             key: const Key('shuffle_all_button'),
             tooltip: 'Shuffle all',
-            icon: Icon(Icons.shuffle, color: fs.parchment),
+            icon: Icon(LucideIcons.shuffle, color: fs.parchment),
             onPressed: () async {
               final messenger = ScaffoldMessenger.of(context);
               final refs = await ref.read(shuffleSourceProvider).tracks();
@@ -866,7 +867,7 @@ class _QuarantineTile extends ConsumerWidget {
         ),
         IconButton(
           tooltip: 'Unhide',
-          icon: Icon(Icons.restore, color: fs.ash, size: 20),
+          icon: Icon(LucideIcons.archive_restore, color: fs.ash, size: 20),
           onPressed: () async {
             try {
               await ref.read(myQuarantineProvider.notifier).unflag(row.trackId);

flutter_client/lib/library/widgets/cached_indicator.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../../cache/audio_cache_manager.dart';
@@ -21,7 +22,7 @@ class CachedIndicator extends ConsumerWidget {
         if (snap.data != true) return const SizedBox.shrink();
         return Padding(
           padding: const EdgeInsets.only(left: 4),
-          child: Icon(Icons.download_done, size: 14, color: fs.accent),
+          child: Icon(LucideIcons.circle_check_big, size: 14, color: fs.accent),
         );
       },
     );

flutter_client/lib/library/widgets/play_circle_button.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 
 import '../../theme/theme_extension.dart';
 
@@ -85,7 +86,7 @@ class _PlayCircleButtonState extends State<PlayCircleButton> {
                   ),
                 )
               : Icon(
-                  Icons.play_arrow,
+                  LucideIcons.play,
                   color: fs.parchment,
                   size: iconSize,
                 ),

flutter_client/lib/likes/like_button.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../api/endpoints/likes.dart';
+import '../shared/widgets/lucide_heart.dart';
 import '../theme/theme_extension.dart';
 import 'likes_provider.dart';
 
@@ -25,8 +26,8 @@ class LikeButton extends ConsumerWidget {
       orElse: () => false,
     );
     return IconButton(
-      icon: Icon(
-        liked ? Icons.favorite : Icons.favorite_border,
+      icon: LucideHeart(
+        filled: liked,
         color: liked ? fs.accent : fs.ash,
         size: size,
       ),

flutter_client/lib/main.dart

@@ -14,6 +14,13 @@ Future<void> main() async {
       androidNotificationChannelId: 'com.fabledsword.minstrel.audio',
       androidNotificationChannelName: 'Minstrel playback',
       androidNotificationOngoing: true,
+      // 8a: hand external surfaces (notification / lock screen / Wear)
+      // a downscaled cover instead of full-res album art — smaller
+      // payload, faster paint, lower memory. 300px is ample for those
+      // targets. preloadArtwork warms it so the first paint isn't blank.
+      artDownscaleWidth: 300,
+      artDownscaleHeight: 300,
+      preloadArtwork: true,
     ),
   );
   runApp(ProviderScope(

flutter_client/lib/models/artist_suggestion.dart

@@ -0,0 +1,51 @@
+/// Mirrors web/src/lib/api/types.ts ArtistSuggestion / SeedContribution —
+/// one out-of-library artist from GET /api/discover/suggestions. image_url
+/// is resolved on-demand from Lidarr server-side (may be empty).
+class SeedContribution {
+  const SeedContribution({required this.name, required this.isLiked});
+
+  final String name;
+  final bool isLiked;
+
+  factory SeedContribution.fromJson(Map<String, dynamic> j) => SeedContribution(
+        name: j['name'] as String? ?? '',
+        isLiked: j['is_liked'] as bool? ?? false,
+      );
+}
+
+class ArtistSuggestion {
+  const ArtistSuggestion({
+    required this.mbid,
+    required this.name,
+    required this.imageUrl,
+    required this.attribution,
+  });
+
+  final String mbid;
+  final String name;
+  final String imageUrl;
+  final List<SeedContribution> attribution;
+
+  factory ArtistSuggestion.fromJson(Map<String, dynamic> j) => ArtistSuggestion(
+        mbid: j['mbid'] as String? ?? '',
+        name: j['name'] as String? ?? '',
+        imageUrl: j['image_url'] as String? ?? '',
+        attribution: ((j['attribution'] as List?) ?? const [])
+            .map((e) =>
+                SeedContribution.fromJson((e as Map).cast<String, dynamic>()))
+            .toList(growable: false),
+      );
+
+  /// Mirrors web SuggestionFeed.attributionText (Oxford comma, max 3).
+  String get attributionText {
+    if (attribution.isEmpty) return '';
+    final phrases = attribution
+        .map((s) => '${s.isLiked ? 'liked' : 'played'} ${s.name}')
+        .toList(growable: false);
+    if (phrases.length == 1) return 'Because you ${phrases[0]}.';
+    if (phrases.length == 2) {
+      return 'Because you ${phrases[0]} and ${phrases[1]}.';
+    }
+    return 'Because you ${phrases[0]}, ${phrases[1]}, and ${phrases[2]}.';
+  }
+}

flutter_client/lib/models/track.dart

@@ -40,4 +40,19 @@ class TrackRef {
         durationSec: (j['duration_sec'] as num?)?.toInt() ?? 0,
         streamUrl: j['stream_url'] as String? ?? '',
       );
+
+  /// Round-trips through [TrackRef.fromJson] (same server snake_case
+  /// keys). Used to persist the playback queue for resume-on-launch.
+  Map<String, dynamic> toJson() => {
+        'id': id,
+        'title': title,
+        'album_id': albumId,
+        'album_title': albumTitle,
+        'artist_id': artistId,
+        'artist_name': artistName,
+        if (trackNumber != null) 'track_number': trackNumber,
+        if (discNumber != null) 'disc_number': discNumber,
+        'duration_sec': durationSec,
+        'stream_url': streamUrl,
+      };
 }

flutter_client/lib/player/audio_handler.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:audio_service/audio_service.dart';
+import 'package:audio_session/audio_session.dart';
 import 'package:flutter/foundation.dart';
 import 'package:just_audio/just_audio.dart';
 import 'package:path_provider/path_provider.dart';
@@ -38,6 +39,7 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
     // the index and the eviction loop can't reclaim them.
     _player.bufferedPositionStream
         .listen((_) => unawaited(_maybeRegisterStreamCache()));
+    unawaited(_configureAudioSession());
   }
 
   final AudioPlayer _player = AudioPlayer();
@@ -57,6 +59,32 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
   /// time the buffered-position stream emits (~200ms cadence).
   String? _cacheDirPath;
 
+  /// How long the session may sit not-actively-playing (paused, or a
+  /// finished queue) before we tear it down so the Wear tile / lock
+  /// screen / notification don't linger on a stale track. The
+  /// notification is configured ongoing (main.dart), so nothing else
+  /// ever drives the MediaSession to a terminal state.
+  static const _idleStopTimeout = Duration(minutes: 5);
+
+  /// Single-shot cleanup timer, armed while not actively playing and
+  /// cancelled the moment playback resumes or a new queue is set.
+  Timer? _idleStopTimer;
+
+  /// Periodic PlaybackState re-broadcast while actively playing so
+  /// external surfaces (lock screen, Wear, Android Auto) interpolate the
+  /// scrubber smoothly. The in-app bar uses positionStream and doesn't
+  /// need this. Active only while playing; cancelled otherwise.
+  Timer? _positionBroadcastTimer;
+
+  /// Player volume captured when an OS duck interruption begins,
+  /// restored when it ends. Null when not currently ducked.
+  double? _volumeBeforeDuck;
+
+  /// True when an interruption (call / other media) paused playback that
+  /// was actively going, so a transient (pause-type) interruption end
+  /// auto-resumes. Cleared on resume or a non-resumable end.
+  bool _interruptedWhilePlaying = false;
+
   /// True while _fillRemainingSources is doing backward-fill inserts
   /// at index 0..initialIndex-1. Each insert shifts the player's
   /// currentIndex (it tracks the actively-playing source through
@@ -74,6 +102,20 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
   /// new queue, leaving the player "locked" to a corrupted state.
   int _queueGeneration = 0;
 
+  /// Logical-queue index that just_audio player-index 0 currently maps
+  /// to. setQueueFromTracks fast-starts with a SINGLE source at player
+  /// index 0 while queue.value already holds the full list, so the
+  /// playing track's logical index is clampedInitial, not 0. The
+  /// transient currentIndexStream→0 emission that arrives just after
+  /// setAudioSources resolves (and after _suppressIndexUpdates is back
+  /// to false) would otherwise make _onCurrentIndexChanged broadcast
+  /// queue.value[0] — the FIRST track — over the correct item, pinning
+  /// the mini bar / playlist marker to the wrong track until a later
+  /// index event. Decremented in lockstep with the backward fill's
+  /// front inserts so player-index → logical-index stays correct and
+  /// lands at 0 once the player list fully matches queue.value.
+  int _logicalIndexBase = 0;
+
   /// Tracks the most recent setQueueFromTracks() input so
   /// skipToQueueItem can reconstruct the source list. just_audio
   /// requires every source to be built before it can be a skip
@@ -91,6 +133,11 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
   String? _queueSource;
   String? get queueSource => _queueSource;
 
+  /// The full TrackRef list backing the current queue (even when only
+  /// part is built as just_audio sources). Empty when nothing is
+  /// queued. Exposed for resume-state persistence (#54).
+  List<TrackRef> get queuedTracks => _lastTracks;
+
   /// Volume stream for UI subscribers. Mirrors the just_audio player's
   /// volume directly; set via setVolume(double).
   Stream<double> get volumeStream => _player.volumeStream;
@@ -104,6 +151,14 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
   Stream<Duration> get positionStream => _player.positionStream;
   Duration get position => _player.position;
 
+  /// Broadcasts the title of a track that just failed to play (404,
+  /// decoder failure, premature EOS, network drop) and was auto-skipped
+  /// or paused by _handlePlaybackError. The app listens and surfaces a
+  /// debounced/coalesced SnackBar so a silent skip isn't mysterious.
+  /// App-lifetime singleton handler — intentionally never closed.
+  final _playbackErrors = StreamController<String>.broadcast();
+  Stream<String> get playbackErrorStream => _playbackErrors.stream;
+
   void configure({
     required String baseUrl,
     required String? token,
@@ -118,12 +173,24 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
     if (audioCacheManager != null) _audioCacheManager = audioCacheManager;
   }
 
+  /// Invoked by play() when nothing is loaded (mediaItem == null) so a
+  /// media-button press after the #52 teardown resumes the last
+  /// persisted session (#448). Registered by ResumeController.start();
+  /// null until then (then it's a no-op fall-through to _player.play()).
+  Future<void> Function()? _resumeHook;
+  void setResumeHook(Future<void> Function() hook) => _resumeHook = hook;
+
   Future<void> setQueueFromTracks(
     List<TrackRef> tracks, {
     int initialIndex = 0,
     String? source,
   }) async {
     if (tracks.isEmpty) return;
+    // New playback supersedes any pending idle cleanup. play() below
+    // re-broadcasts and _reconcileIdleTimer would cancel anyway; doing
+    // it up front avoids a race during the pause→swap window.
+    _idleStopTimer?.cancel();
+    _idleStopTimer = null;
     _queueSource = source;
     final clampedInitial = initialIndex.clamp(0, tracks.length - 1);
 
@@ -178,6 +245,11 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
     _suppressIndexUpdates = true;
     try {
       await _player.setAudioSources([initial], initialIndex: 0);
+      // Player-index 0 holds the single fast-start source, which is
+      // logical-queue index clampedInitial. Record the offset before
+      // broadcasting so the post-resolve currentIndexStream→0 emission
+      // maps back to the correct item instead of queue.value[0].
+      _logicalIndexBase = clampedInitial;
       // Broadcast in this order: queue first (so any consumer that
       // reacts to mediaItem and reads queue.value sees the consistent
       // pair), then mediaItem.
@@ -242,6 +314,11 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
           final src = await _buildAudioSource(tracks[i]);
           if (gen != _queueGeneration) return;
           await _player.insertAudioSource(i, src);
+          // Each front insert shifts the playing source's player index
+          // up by one; drop the base in lockstep so player-index →
+          // logical-index stays correct (and reaches 0 once the player
+          // list fully matches queue.value).
+          _logicalIndexBase -= 1;
         }
       } catch (e) {
         debugPrint('audio_handler: backward fill failed: $e');
@@ -416,6 +493,12 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
   /// If we're at the last track, seekToNext is a no-op; the state
   /// drops to idle and _broadcastState reflects that.
   Future<void> _handlePlaybackError() async {
+    // mediaItem is the correctly-mapped current track (post #49 logical
+    // index), so it's the one that just failed — no player-index math.
+    final failed = mediaItem.value?.title;
+    if (failed != null && failed.isNotEmpty) {
+      _playbackErrors.add(failed);
+    }
     final currentIdx = _player.currentIndex;
     final queueLen = queue.value.length;
     if (currentIdx == null || currentIdx + 1 >= queueLen) {
@@ -447,8 +530,15 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
     // track was passed via setQueueFromTracks(initialIndex:) regardless
     // of skip/auto-advance.
     final items = queue.value;
-    if (idx >= 0 && idx < items.length) {
-      mediaItem.add(items[idx]);
+    // Map the just_audio player index back to the logical queue index.
+    // During the fast-start/fill window the player list is a moving
+    // window offset from queue.value by _logicalIndexBase; mapping the
+    // raw player index straight in here is what previously broadcast
+    // queue.value[0] (the first track) over the correct item on every
+    // fast-start with initialIndex > 0.
+    final logical = idx + _logicalIndexBase;
+    if (logical >= 0 && logical < items.length) {
+      mediaItem.add(items[logical]);
     }
     unawaited(_loadArtForCurrentItem());
   }
@@ -472,8 +562,61 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
     mediaItem.add(current.copyWith(artUri: Uri.file(path)));
   }
 
+  /// Drives the session to a terminal state and tears down the
+  /// foreground service so external surfaces (Wear tile, lock screen,
+  /// in-app mini bar) drop it instead of showing a stale paused track.
+  /// Called on the idle timeout and from onTaskRemoved when not playing;
+  /// no other path stops the session (the notification is ongoing).
   @override
-  Future<void> play() => _player.play();
+  Future<void> stop() async {
+    _idleStopTimer?.cancel();
+    _idleStopTimer = null;
+    _positionBroadcastTimer?.cancel();
+    _positionBroadcastTimer = null;
+    try {
+      await _player.stop();
+    } catch (_) {}
+    // Explicit terminal broadcast before super.stop() tears down the
+    // isolate/notification, so subscribers see idle even if the
+    // player's own event lags the service teardown. queue/mediaItem
+    // cleared so the in-app mini bar collapses in lockstep with the
+    // watch tile rather than lingering on the last track.
+    playbackState.add(playbackState.value.copyWith(
+      playing: false,
+      processingState: AudioProcessingState.idle,
+    ));
+    mediaItem.add(null);
+    queue.add([]);
+    await super.stop();
+  }
+
+  /// App swiped away from recents. Keep playing if audio is active
+  /// (standard media behaviour — music shouldn't die because the app
+  /// left recents); otherwise stop so the watch tile / notification
+  /// don't linger on a stale paused track.
+  @override
+  Future<void> onTaskRemoved() async {
+    if (_player.playing &&
+        _player.processingState != ProcessingState.completed) {
+      await super.onTaskRemoved();
+      return;
+    }
+    await stop();
+  }
+
+  @override
+  Future<void> play() async {
+    // Nothing loaded (fresh, or torn down by the #52 idle/dismiss
+    // teardown): a media-button press resumes the last persisted
+    // session instead of no-op'ing (#448). The hook restores the queue
+    // and starts playback itself, so we return without calling
+    // _player.play() on an empty player.
+    if (mediaItem.value == null && _resumeHook != null) {
+      await _resumeHook!();
+      return;
+    }
+    await _player.play();
+  }
 
   @override
   Future<void> pause() => _player.pause();
@@ -526,6 +669,12 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
     mediaItem.add(media.copyWith(rating: Rating.newHeartRating(liked)));
   }
 
+  /// Re-broadcasts PlaybackState so the notification favorite control's
+  /// icon/label reflects a like toggled from elsewhere (TrackRow, kebab,
+  /// another device via SSE). Sibling to refreshCurrentRating, which
+  /// updates the Wear/lock heart via MediaItem.rating.
+  void refreshFavoriteControl() => _broadcastState(null);
+
   @override
   Future<void> setShuffleMode(AudioServiceShuffleMode shuffleMode) async {
     await _player
@@ -550,16 +699,56 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
     await _player.setVolume(v.clamp(0.0, 1.0));
   }
 
+  /// Handles the notification favorite control (and any future custom
+  /// actions). Toggles the current track's like via the LikeBridge,
+  /// then re-broadcasts so the heart icon/label flips. Signature
+  /// matches `AudioHandler.customAction` (`Future<dynamic>`).
+  @override
+  Future<dynamic> customAction(String name,
+      [Map<String, dynamic>? extras]) async {
+    if (name == 'minstrel.favorite') {
+      final media = mediaItem.value;
+      final bridge = _likeBridge;
+      if (media == null || bridge == null) return null;
+      try {
+        await bridge.toggleTrackLike(media.id);
+      } catch (_) {}
+      _broadcastState(null);
+      return null;
+    }
+    return super.customAction(name, extras);
+  }
+
   // _broadcastState accepts a nullable event because the shuffle/repeat
   // listeners don't have one — we just want to re-emit PlaybackState
   // with up-to-date shuffleMode/repeatMode fields.
   void _broadcastState(PlaybackEvent? event) {
     final playing = _player.playing;
+    // Favorite control: only when a track is playing and the LikeBridge
+    // is wired. Icon/label toggle by current like state; tapping it
+    // routes to customAction('minstrel.favorite'). Implemented as a
+    // MediaControl.custom (NOT setRating — that path is broken upstream,
+    // audio_service #376, and regressed the Pixel Watch). Kept out of
+    // androidCompactActionIndices so the compact/lock view is unchanged.
+    final favTrackId = mediaItem.value?.id;
+    final favBridge = _likeBridge;
+    final showFav = favTrackId != null && favBridge != null;
+    final favLiked = favTrackId != null &&
+        favBridge != null &&
+        favBridge.isTrackLiked(favTrackId);
     playbackState.add(PlaybackState(
       controls: [
         MediaControl.skipToPrevious,
         if (playing) MediaControl.pause else MediaControl.play,
         MediaControl.skipToNext,
+        if (showFav)
+          MediaControl.custom(
+            androidIcon: favLiked
+                ? 'drawable/ic_stat_favorite'
+                : 'drawable/ic_stat_favorite_border',
+            label: favLiked ? 'Unfavorite' : 'Favorite',
+            name: 'minstrel.favorite',
+          ),
       ],
       // androidCompactActionIndices tells the system which controls
       // appear in the collapsed/lock-screen view. Without this, some
@@ -608,6 +797,121 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
         LoopMode.all => AudioServiceRepeatMode.all,
       },
     ));
+    _reconcileIdleTimer();
+    _reconcilePositionBroadcast();
+  }
+
+  /// Arms (or cancels) the idle-cleanup timer based on the current
+  /// player state. Driven from _broadcastState, which fires on every
+  /// play/pause/buffer/complete transition, so paused AND finished-queue
+  /// both arm it. Idle (already stopped) never re-arms — otherwise stop()
+  /// would loop every _idleStopTimeout.
+  void _reconcileIdleTimer() {
+    final ps = _player.processingState;
+    if (ps == ProcessingState.idle) {
+      _idleStopTimer?.cancel();
+      _idleStopTimer = null;
+      return;
+    }
+    final activelyPlaying =
+        _player.playing && ps != ProcessingState.completed;
+    if (activelyPlaying) {
+      _idleStopTimer?.cancel();
+      _idleStopTimer = null;
+      return;
+    }
+    _idleStopTimer ??= Timer(_idleStopTimeout, _onIdleTimeout);
+  }
+
+  void _onIdleTimeout() {
+    _idleStopTimer = null;
+    final ps = _player.processingState;
+    if (ps == ProcessingState.idle) return; // already torn down
+    if (_player.playing && ps != ProcessingState.completed) {
+      return; // resumed between arm and fire
+    }
+    unawaited(stop());
+  }
+
+  /// While actively playing, keeps a 1s periodic PlaybackState re-
+  /// broadcast running so updateTime/updatePosition stay fresh and
+  /// external surfaces interpolate the scrubber smoothly. Idempotent and
+  /// driven from _broadcastState — which the periodic tick itself calls,
+  /// so the "already running" guard prevents pile-up. Cancels the moment
+  /// playback is no longer active.
+  void _reconcilePositionBroadcast() {
+    final ps = _player.processingState;
+    final active = _player.playing &&
+        ps != ProcessingState.idle &&
+        ps != ProcessingState.completed;
+    if (!active) {
+      _positionBroadcastTimer?.cancel();
+      _positionBroadcastTimer = null;
+      return;
+    }
+    _positionBroadcastTimer ??= Timer.periodic(
+      const Duration(seconds: 1),
+      (_) => _broadcastState(null),
+    );
+  }
+
+  /// Configures the OS audio session for music playback and wires
+  /// interruption + becoming-noisy handling. just_audio auto-activates /
+  /// deactivates the session around playback once it's configured, but
+  /// does NOT handle interruptions or the headphones-unplugged event
+  /// itself — that's done here. Best effort: a failure must not break
+  /// playback.
+  Future<void> _configureAudioSession() async {
+    try {
+      final session = await AudioSession.instance;
+      await session.configure(const AudioSessionConfiguration.music());
+      session.interruptionEventStream.listen(_onInterruption);
+      session.becomingNoisyEventStream.listen((_) {
+        // Headphones unplugged / Bluetooth disconnected — never blast the
+        // phone speaker; pause like every other media app.
+        unawaited(_player.pause());
+      });
+    } catch (e, st) {
+      debugPrint('audio_handler: audio session configure failed: $e\n$st');
+    }
+  }
+
+  void _onInterruption(AudioInterruptionEvent event) {
+    if (event.begin) {
+      switch (event.type) {
+        case AudioInterruptionType.duck:
+          // Transient: another app wants the foreground briefly. Lower
+          // our volume rather than stopping (OS may also auto-duck).
+          _volumeBeforeDuck = _player.volume;
+          unawaited(_player.setVolume(0.3));
+        case AudioInterruptionType.pause:
+        case AudioInterruptionType.unknown:
+          // Call / other media took focus. Remember whether we were
+          // actively playing so a transient end can resume us.
+          _interruptedWhilePlaying = _player.playing &&
+              _player.processingState != ProcessingState.completed;
+          unawaited(_player.pause());
+      }
+    } else {
+      switch (event.type) {
+        case AudioInterruptionType.duck:
+          unawaited(_player.setVolume(_volumeBeforeDuck ?? 1.0));
+          _volumeBeforeDuck = null;
+        case AudioInterruptionType.pause:
+          // Transient interruption ended — resume only if WE paused it
+          // and the session is still alive (a long call may have let the
+          // #52 idle timer tear it down; re-init is resume-last-session
+          // territory, out of scope here).
+          if (_interruptedWhilePlaying &&
+              _player.processingState != ProcessingState.idle) {
+            unawaited(_player.play());
+          }
+          _interruptedWhilePlaying = false;
+        case AudioInterruptionType.unknown:
+          // Unknown end — do not auto-resume (could surprise the user).
+          _interruptedWhilePlaying = false;
+      }
+    }
   }
 }
 

flutter_client/lib/player/now_playing_screen.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:audio_service/audio_service.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -221,6 +222,14 @@ class _NowPlayingScreenState extends ConsumerState<NowPlayingScreen> {
             _displayedDominant = null;
             _pendingPreloadId = null;
           });
+          // Session was torn down (#52 idle/dismiss) while the full
+          // player was open. Don't strand the user on an empty
+          // "Nothing playing." screen — minimize back (the mini bar is
+          // already gone too). maybePop is a no-op if this is somehow
+          // the root route.
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            if (mounted) Navigator.of(context).maybePop();
+          });
         }
         return;
       }
@@ -376,13 +385,13 @@ class _TopBar extends StatelessWidget {
         padding: const EdgeInsets.symmetric(horizontal: 4),
         child: Row(children: [
           IconButton(
-            icon: Icon(Icons.expand_more, color: fs.parchment),
+            icon: Icon(LucideIcons.chevron_down, color: fs.parchment),
             tooltip: 'Close',
             onPressed: () => Navigator.of(context).maybePop(),
           ),
           const Spacer(),
           IconButton(
-            icon: Icon(Icons.queue_music, color: fs.parchment),
+            icon: Icon(LucideIcons.list_music, color: fs.parchment),
             tooltip: 'Queue',
             onPressed: () => GoRouter.of(context).push('/queue'),
           ),
@@ -535,13 +544,13 @@ class _PrimaryControls extends StatelessWidget {
       children: [
         IconButton(
           iconSize: 36,
-          icon: Icon(Icons.skip_previous, color: fs.parchment),
+          icon: Icon(LucideIcons.skip_back, color: fs.parchment),
           onPressed: () => ref.read(audioHandlerProvider).skipToPrevious(),
         ),
         IconButton(
           iconSize: 72,
           icon: Icon(
-            isPlaying ? Icons.pause_circle_filled : Icons.play_circle_filled,
+            isPlaying ? LucideIcons.circle_pause : LucideIcons.circle_play,
             color: fs.accent,
           ),
           onPressed: () {
@@ -555,7 +564,7 @@ class _PrimaryControls extends StatelessWidget {
         ),
         IconButton(
           iconSize: 36,
-          icon: Icon(Icons.skip_next, color: fs.parchment),
+          icon: Icon(LucideIcons.skip_forward, color: fs.parchment),
           onPressed: () => ref.read(audioHandlerProvider).skipToNext(),
         ),
       ],
@@ -589,7 +598,7 @@ class _SecondaryControls extends StatelessWidget {
         IconButton(
           tooltip: shuffleOn ? 'Shuffle on' : 'Shuffle off',
           icon: Icon(
-            Icons.shuffle,
+            LucideIcons.shuffle,
             color: shuffleOn ? fs.accent : fs.ash,
           ),
           onPressed: actions.toggleShuffle,
@@ -602,8 +611,8 @@ class _SecondaryControls extends StatelessWidget {
           },
           icon: Icon(
             repeatMode == AudioServiceRepeatMode.one
-                ? Icons.repeat_one
-                : Icons.repeat,
+                ? LucideIcons.repeat_1
+                : LucideIcons.repeat,
             color: repeatMode == AudioServiceRepeatMode.none
                 ? fs.ash
                 : fs.accent,
@@ -612,7 +621,7 @@ class _SecondaryControls extends StatelessWidget {
         ),
         IconButton(
           tooltip: 'Queue',
-          icon: Icon(Icons.queue_music, color: fs.ash),
+          icon: Icon(LucideIcons.list_music, color: fs.ash),
           onPressed: () => GoRouter.of(context).push('/queue'),
         ),
         LikeButton(kind: LikeKind.track, id: media.id, size: 22),

flutter_client/lib/player/playback_error_reporter.dart

@@ -0,0 +1,78 @@
+// Surfaces playback errors (#58). _handlePlaybackError in the audio
+// handler silently skips a dead track (404 / decoder failure / premature
+// EOS / network drop) with only a debugPrint — which hides exactly the
+// signal that distinguishes "this track is broken" from "the app is
+// flaky" (server file moved, auth expired, cache miss, transcode fail).
+//
+// This listens to the handler's playbackErrorStream and shows a
+// transient SnackBar via a global ScaffoldMessenger key. Bursts are
+// coalesced: a debounce window collects errors and emits one message
+// ("Skipped N unplayable tracks") instead of stacking N toasts.
+
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'player_provider.dart';
+
+/// Set on MaterialApp.router so SnackBars can be shown from outside any
+/// widget's BuildContext (the handler's error stream is isolate-side).
+final scaffoldMessengerKey = GlobalKey<ScaffoldMessengerState>();
+
+class PlaybackErrorReporter {
+  PlaybackErrorReporter(this._ref);
+  final Ref _ref;
+
+  StreamSubscription<String>? _sub;
+  Timer? _debounce;
+  final _buffer = <String>[];
+  bool _disposed = false;
+
+  void start() {
+    try {
+      // audioHandlerProvider throws until main() overrides it (the real
+      // app always does). In tests / no-audio environments there's
+      // nothing to report — stay inert.
+      final h = _ref.read(audioHandlerProvider);
+      _sub = h.playbackErrorStream.listen(_onError);
+    } catch (_) {
+      return;
+    }
+  }
+
+  void _onError(String title) {
+    if (_disposed) return;
+    _buffer.add(title);
+    _debounce?.cancel();
+    _debounce = Timer(const Duration(seconds: 2), _flush);
+  }
+
+  void _flush() {
+    if (_disposed || _buffer.isEmpty) return;
+    final n = _buffer.length;
+    final first = _buffer.first;
+    _buffer.clear();
+    final msg = n == 1
+        ? 'Couldn’t play “$first” — skipping'
+        : 'Skipped $n unplayable tracks';
+    scaffoldMessengerKey.currentState?.showSnackBar(
+      SnackBar(content: Text(msg)),
+    );
+  }
+
+  void dispose() {
+    _disposed = true;
+    _debounce?.cancel();
+    _sub?.cancel();
+  }
+}
+
+/// Read once at app start (app.dart postFrame). Disposed via
+/// ref.onDispose when the scope tears down.
+final playbackErrorReporterProvider = Provider<PlaybackErrorReporter>((ref) {
+  final r = PlaybackErrorReporter(ref);
+  ref.onDispose(r.dispose);
+  r.start();
+  return r;
+});

flutter_client/lib/player/player_bar.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'package:audio_service/audio_service.dart';
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -229,7 +230,7 @@ class _PlayControls extends StatelessWidget {
           child: IconButton(
             padding: EdgeInsets.zero,
             iconSize: 22,
-            icon: Icon(Icons.skip_previous, color: fs.parchment),
+            icon: Icon(LucideIcons.skip_back, color: fs.parchment),
             onPressed: () => ref.read(audioHandlerProvider).skipToPrevious(),
           ),
         ),
@@ -240,7 +241,7 @@ class _PlayControls extends StatelessWidget {
             padding: EdgeInsets.zero,
             iconSize: 32,
             icon: Icon(
-              isPlaying ? Icons.pause_circle_filled : Icons.play_circle_filled,
+              isPlaying ? LucideIcons.circle_pause : LucideIcons.circle_play,
               color: fs.accent,
             ),
             onPressed: () {
@@ -259,7 +260,7 @@ class _PlayControls extends StatelessWidget {
           child: IconButton(
             padding: EdgeInsets.zero,
             iconSize: 22,
-            icon: Icon(Icons.skip_next, color: fs.parchment),
+            icon: Icon(LucideIcons.skip_forward, color: fs.parchment),
             onPressed: () => ref.read(audioHandlerProvider).skipToNext(),
           ),
         ),

flutter_client/lib/player/player_provider.dart

@@ -62,7 +62,9 @@ class PlayerActions {
     // kebab menu, or another logged-in device propagating via SSE.
     _ref.listen<AsyncValue<LikedIds>>(likedIdsProvider, (_, next) {
       if (next.value == null) return;
-      _ref.read(audioHandlerProvider).refreshCurrentRating();
+      _ref.read(audioHandlerProvider)
+        ..refreshCurrentRating()
+        ..refreshFavoriteControl();
     });
   }
   final Ref _ref;
@@ -101,6 +103,36 @@ class PlayerActions {
     await h.play();
   }
 
+  /// Rebuilds a previously-persisted queue WITHOUT auto-playing, then
+  /// seeks to [position]. The resume-on-launch path (#54): the user
+  /// sees their last track in the mini bar, paused, and continues with
+  /// play / a media button. Mirrors playTracks' configure step so
+  /// streaming works after restore; intentionally no h.play().
+  Future<void> restoreQueue(
+    List<TrackRef> tracks, {
+    int initialIndex = 0,
+    Duration position = Duration.zero,
+    String? source,
+  }) async {
+    if (tracks.isEmpty) return;
+    final url   = await _ref.read(serverUrlProvider.future);
+    final token = await _ref.read(secureStorageProvider).read(key: 'session_token');
+    final cache = _ref.read(albumCoverCacheProvider);
+    final audioCache = _ref.read(audioCacheManagerProvider);
+    final h = _ref.read(audioHandlerProvider)
+      ..configure(
+        baseUrl: url ?? '',
+        token: token,
+        coverCache: cache,
+        audioCacheManager: audioCache,
+        likeBridge: _buildLikeBridge(),
+      );
+    await h.setQueueFromTracks(tracks, initialIndex: initialIndex, source: source);
+    if (position > Duration.zero) {
+      await h.seek(position);
+    }
+  }
+
   /// Builds the adapter the audio handler uses to read + flip the
   /// current track's like state in response to external media-
   /// controller events (Wear's heart button, lock-screen favorite).

flutter_client/lib/player/queue_screen.dart

@@ -1,5 +1,6 @@
 import 'package:audio_service/audio_service.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -20,7 +21,7 @@ class QueueScreen extends ConsumerWidget {
         backgroundColor: fs.obsidian,
         elevation: 0,
         leading: IconButton(
-          icon: Icon(Icons.arrow_back, color: fs.parchment),
+          icon: Icon(LucideIcons.arrow_left, color: fs.parchment),
           onPressed: () => context.pop(),
         ),
         title: Text('Queue', style: TextStyle(color: fs.parchment)),
@@ -84,7 +85,7 @@ class _QueueRow extends StatelessWidget {
           if (isCurrent)
             Padding(
               padding: const EdgeInsets.only(right: 8),
-              child: Icon(Icons.graphic_eq, color: fs.accent, size: 16),
+              child: Icon(LucideIcons.audio_lines, color: fs.accent, size: 16),
             ),
           Expanded(
             child: Column(

flutter_client/lib/playlists/playlist_detail_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -54,7 +55,7 @@ class PlaylistDetailScreen extends ConsumerWidget {
         backgroundColor: fs.obsidian,
         elevation: 0,
         leading: IconButton(
-          icon: Icon(Icons.arrow_back, color: fs.parchment),
+          icon: Icon(LucideIcons.arrow_left, color: fs.parchment),
           onPressed: () => context.pop(),
         ),
         title: headerName.isEmpty
@@ -268,7 +269,7 @@ class _Header extends ConsumerWidget {
               OutlinedButton.icon(
                 key: const Key('regenerate_playlist_button'),
                 onPressed: () => _regenerate(context, ref),
-                icon: const Icon(Icons.refresh, size: 16),
+                icon: const Icon(LucideIcons.refresh_cw, size: 16),
                 label: const Text('Regenerate'),
               ),
               const SizedBox(width: 8),
@@ -281,7 +282,7 @@ class _Header extends ConsumerWidget {
                       source: p.refreshable ? p.systemVariant : null,
                     );
               },
-              icon: const Icon(Icons.play_arrow),
+              icon: const Icon(LucideIcons.play),
               label: const Text('Play'),
               style: FilledButton.styleFrom(
                 backgroundColor: fs.accent,

flutter_client/lib/playlists/playlists_list_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -82,11 +83,11 @@ class _PlaylistTile extends StatelessWidget {
               height: 56,
               color: fs.slate,
               child: playlist.coverUrl.isEmpty
-                  ? Icon(Icons.queue_music, color: fs.ash)
+                  ? Icon(LucideIcons.list_music, color: fs.ash)
                   : ServerImage(
                       url: playlist.coverUrl,
                       fit: BoxFit.cover,
-                      fallback: Icon(Icons.queue_music, color: fs.ash),
+                      fallback: Icon(LucideIcons.list_music, color: fs.ash),
                     ),
             ),
           ),
@@ -128,7 +129,7 @@ class _PlaylistTile extends StatelessWidget {
               ],
             ),
           ),
-          Icon(Icons.chevron_right, color: fs.ash),
+          Icon(LucideIcons.chevron_right, color: fs.ash),
         ]),
       ),
     );

flutter_client/lib/playlists/widgets/playlist_card.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -55,12 +56,12 @@ class PlaylistCard extends ConsumerWidget {
                       // errorBuilder shows the queue_music icon over the
                       // slate background.
                       child: playlist.coverUrl.isEmpty
-                          ? Icon(Icons.queue_music, color: fs.ash, size: 56)
+                          ? Icon(LucideIcons.list_music, color: fs.ash, size: 56)
                           : ServerImage(
                               url: playlist.coverUrl,
                               fit: BoxFit.cover,
                               fallback:
-                                  Icon(Icons.queue_music, color: fs.ash, size: 56),
+                                  Icon(LucideIcons.list_music, color: fs.ash, size: 56),
                             ),
                     ),
                   ),
@@ -80,7 +81,7 @@ class PlaylistCard extends ConsumerWidget {
                       top: 2,
                       right: 2,
                       child: PopupMenuButton<String>(
-                        icon: Icon(Icons.more_vert, color: fs.parchment, size: 18),
+                        icon: Icon(LucideIcons.ellipsis_vertical, color: fs.parchment, size: 18),
                         tooltip: 'Playlist actions',
                         color: fs.iron,
                         onSelected: (_) => _refresh(context, ref),
@@ -88,7 +89,7 @@ class PlaylistCard extends ConsumerWidget {
                           PopupMenuItem<String>(
                             value: 'refresh',
                             child: Row(children: [
-                              Icon(Icons.refresh, color: fs.parchment, size: 18),
+                              Icon(LucideIcons.refresh_cw, color: fs.parchment, size: 18),
                               const SizedBox(width: 8),
                               Text(_refreshLabel,
                                   style: TextStyle(color: fs.parchment)),

flutter_client/lib/playlists/widgets/playlist_placeholder_card.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 
 import '../../theme/theme_extension.dart';
 
@@ -65,9 +66,9 @@ class PlaylistPlaceholderCard extends StatelessWidget {
           child: CircularProgressIndicator(strokeWidth: 2, color: fs.accent),
         );
       case 'failed':
-        return Icon(Icons.warning_amber, color: fs.error, size: 32);
+        return Icon(LucideIcons.triangle_alert, color: fs.error, size: 32);
       default:
-        return Icon(Icons.queue_music, color: fs.ash, size: 40);
+        return Icon(LucideIcons.list_music, color: fs.ash, size: 40);
     }
   }
 

flutter_client/lib/requests/requests_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -32,7 +33,7 @@ class RequestsScreen extends ConsumerWidget {
         backgroundColor: fs.obsidian,
         elevation: 0,
         leading: IconButton(
-          icon: Icon(Icons.arrow_back, color: fs.parchment),
+          icon: Icon(LucideIcons.arrow_left, color: fs.parchment),
           onPressed: () => context.pop(),
         ),
         title: Text('Your requests', style: TextStyle(color: fs.parchment)),
@@ -130,9 +131,9 @@ class _RequestRow extends StatelessWidget {
 
   Widget _kindAvatar(FabledSwordTheme fs) {
     final icon = switch (request.kind) {
-      'artist' => Icons.album,
-      'album' => Icons.library_music,
-      _ => Icons.music_note,
+      'artist' => LucideIcons.disc_3,
+      'album' => LucideIcons.library_big,
+      _ => LucideIcons.music,
     };
     return CircleAvatar(
       backgroundColor: fs.iron,
@@ -164,7 +165,7 @@ class _RequestRow extends StatelessWidget {
           );
           if (ok == true) onCancel();
         },
-        icon: const Icon(Icons.close, size: 16),
+        icon: const Icon(LucideIcons.x, size: 16),
         label: const Text('Cancel'),
         style: TextButton.styleFrom(foregroundColor: fs.ash),
       );
@@ -172,7 +173,7 @@ class _RequestRow extends StatelessWidget {
     if (request.status == 'completed' && href != null) {
       return TextButton.icon(
         onPressed: () => context.push(href),
-        icon: const Icon(Icons.play_arrow, size: 16),
+        icon: const Icon(LucideIcons.play, size: 16),
         label: const Text('Listen'),
         style: TextButton.styleFrom(foregroundColor: fs.accent),
       );

flutter_client/lib/search/search_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -47,7 +48,7 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
         backgroundColor: fs.obsidian,
         elevation: 0,
         leading: IconButton(
-          icon: Icon(Icons.arrow_back, color: fs.parchment),
+          icon: Icon(LucideIcons.arrow_left, color: fs.parchment),
           onPressed: () => context.pop(),
         ),
         title: TextField(
@@ -67,7 +68,7 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
         actions: [
           if (_controller.text.isNotEmpty)
             IconButton(
-              icon: Icon(Icons.clear, color: fs.ash),
+              icon: Icon(LucideIcons.x, color: fs.ash),
               onPressed: () {
                 _controller.clear();
                 ref.read(searchQueryProvider.notifier).set('');

flutter_client/lib/settings/about_section.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 
@@ -88,7 +89,7 @@ class _AboutSectionState extends ConsumerState<AboutSection> {
         padding: const EdgeInsets.fromLTRB(16, 0, 16, 4),
         child: Row(
           children: [
-            Icon(Icons.info_outline, color: fs.parchment, size: 18),
+            Icon(LucideIcons.info, color: fs.parchment, size: 18),
             const SizedBox(width: 8),
             Text('Installed version',
                 style: TextStyle(color: fs.parchment, fontSize: 14)),
@@ -105,7 +106,7 @@ class _AboutSectionState extends ConsumerState<AboutSection> {
         padding: const EdgeInsets.fromLTRB(16, 4, 16, 4),
         child: Row(
           children: [
-            Icon(Icons.cloud_outlined, color: fs.parchment, size: 18),
+            Icon(LucideIcons.cloud, color: fs.parchment, size: 18),
             const SizedBox(width: 8),
             Text('Latest version',
                 style: TextStyle(color: fs.parchment, fontSize: 14)),
@@ -148,7 +149,7 @@ class _AboutSectionState extends ConsumerState<AboutSection> {
                         valueColor: AlwaysStoppedAnimation(fs.parchment),
                       ),
                     )
-                  : const Icon(Icons.refresh, size: 18),
+                  : const Icon(LucideIcons.refresh_cw, size: 18),
               label: Text(_checking ? 'Checking…' : 'Check for updates'),
             ),
             if (hasUpdate) ...[
@@ -172,7 +173,7 @@ class _AboutSectionState extends ConsumerState<AboutSection> {
                           valueColor: AlwaysStoppedAnimation(fs.parchment),
                         ),
                       )
-                    : const Icon(Icons.system_update, size: 18),
+                    : const Icon(LucideIcons.download, size: 18),
                 label: Text(
                   _installStage == _InstallStage.downloading
                       ? 'Downloading…'

flutter_client/lib/settings/settings_screen.dart

@@ -1,5 +1,6 @@
 import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -37,7 +38,7 @@ class SettingsScreen extends ConsumerWidget {
         backgroundColor: fs.obsidian,
         elevation: 0,
         leading: IconButton(
-          icon: Icon(Icons.arrow_back, color: fs.parchment),
+          icon: Icon(LucideIcons.arrow_left, color: fs.parchment),
           onPressed: () => context.pop(),
         ),
         title: Text('Settings', style: TextStyle(color: fs.parchment)),
@@ -107,7 +108,7 @@ class _RequestsSection extends StatelessWidget {
     final fs = Theme.of(context).extension<FabledSwordTheme>()!;
     return ListTile(
       key: const Key('settings_requests_card'),
-      leading: Icon(Icons.queue_music, color: fs.parchment),
+      leading: Icon(LucideIcons.list_music, color: fs.parchment),
       title: Text(
         'My requests',
         style: TextStyle(
@@ -120,7 +121,7 @@ class _RequestsSection extends StatelessWidget {
         "Track what you've asked Minstrel to add",
         style: TextStyle(color: fs.ash),
       ),
-      trailing: Icon(Icons.chevron_right, color: fs.ash),
+      trailing: Icon(LucideIcons.chevron_right, color: fs.ash),
       onTap: () => context.push('/requests'),
     );
   }
@@ -143,7 +144,7 @@ class _AdminSection extends ConsumerWidget {
         const _Divider(),
         ListTile(
           key: const Key('settings_admin_card'),
-          leading: Icon(Icons.shield, color: fs.parchment),
+          leading: Icon(LucideIcons.shield, color: fs.parchment),
           title: Text(
             'Admin',
             style: TextStyle(
@@ -156,7 +157,7 @@ class _AdminSection extends ConsumerWidget {
             'Manage requests, quarantine, and users',
             style: TextStyle(color: fs.ash),
           ),
-          trailing: Icon(Icons.chevron_right, color: fs.ash),
+          trailing: Icon(LucideIcons.chevron_right, color: fs.ash),
           onTap: () => context.push('/admin'),
         ),
       ],

flutter_client/lib/settings/storage_section.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../cache/audio_cache_manager.dart';
@@ -140,7 +141,7 @@ class _StorageSectionState extends ConsumerState<StorageSection> {
                             height: 14,
                             child: CircularProgressIndicator(strokeWidth: 2),
                           )
-                        : const Icon(Icons.sync, size: 16),
+                        : const Icon(LucideIcons.refresh_cw, size: 16),
                     label: const Text('Sync now'),
                   ),
                 ]),

flutter_client/lib/shared/widgets/lucide_heart.dart

@@ -0,0 +1,43 @@
+import 'package:flutter/widgets.dart';
+import 'package:flutter_svg/flutter_svg.dart';
+
+/// The Lucide "heart" silhouette rendered as either an outline (stroke)
+/// or a solid fill. Lucide ships only an outline heart, so the liked
+/// state fills the same authoritative Lucide path (verified verbatim
+/// from lucide-icons/lucide) — keeping both states visually Lucide
+/// rather than introducing a Material filled heart. Used by LikeButton
+/// (and, re-derived to a VectorDrawable, by the media notification).
+class LucideHeart extends StatelessWidget {
+  const LucideHeart({
+    required this.filled,
+    required this.color,
+    this.size = 22,
+    super.key,
+  });
+
+  final bool filled;
+  final Color color;
+  final double size;
+
+  static const _path =
+      'M2 9.5a5.5 5.5 0 0 1 9.591-3.676.56.56 0 0 0 .818 0A5.49 5.49 0 0 1 '
+      '22 9.5c0 2.29-1.5 4-3 5.5l-5.492 5.313a2 2 0 0 1-3 .019L5 15c-1.5-1.5'
+      '-3-3.2-3-5.5';
+
+  @override
+  Widget build(BuildContext context) {
+    final svg = filled
+        ? '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">'
+            '<path d="$_path" fill="currentColor"/></svg>'
+        : '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">'
+            '<path d="$_path" fill="none" stroke="currentColor" '
+            'stroke-width="2" stroke-linecap="round" '
+            'stroke-linejoin="round"/></svg>';
+    return SvgPicture.string(
+      svg,
+      width: size,
+      height: size,
+      colorFilter: ColorFilter.mode(color, BlendMode.srcIn),
+    );
+  }
+}

flutter_client/lib/shared/widgets/main_app_bar_actions.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -26,27 +27,27 @@ class MainAppBarActions extends ConsumerWidget {
         if (currentRoute != '/home')
           IconButton(
             key: const Key('app_bar_home'),
-            icon: Icon(Icons.home, color: fs.parchment),
+            icon: Icon(LucideIcons.house, color: fs.parchment),
             tooltip: 'Home',
             onPressed: () => context.go('/home'),
           ),
         if (currentRoute != '/library')
           IconButton(
             key: const Key('app_bar_library'),
-            icon: Icon(Icons.library_music, color: fs.parchment),
+            icon: Icon(LucideIcons.library_big, color: fs.parchment),
             tooltip: 'Library',
             onPressed: () => context.push('/library'),
           ),
         if (currentRoute != '/search')
           IconButton(
             key: const Key('app_bar_search'),
-            icon: Icon(Icons.search, color: fs.parchment),
+            icon: Icon(LucideIcons.search, color: fs.parchment),
             tooltip: 'Search',
             onPressed: () => context.push('/search'),
           ),
         PopupMenuButton<String>(
           key: const Key('app_bar_overflow'),
-          icon: Icon(Icons.more_vert, color: fs.parchment),
+          icon: Icon(LucideIcons.ellipsis_vertical, color: fs.parchment),
           tooltip: 'More',
           onSelected: (route) => context.push(route),
           itemBuilder: (_) => [

flutter_client/lib/shared/widgets/track_actions/add_to_playlist_sheet.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../../../playlists/playlists_provider.dart';
@@ -70,7 +71,7 @@ class AddToPlaylistSheet extends ConsumerWidget {
                       final p = owned[i];
                       return ListTile(
                         key: Key('add_to_playlist_${p.id}'),
-                        leading: Icon(Icons.queue_music, color: fs.parchment),
+                        leading: Icon(LucideIcons.list_music, color: fs.parchment),
                         title: Text(
                           p.name,
                           style: TextStyle(color: fs.parchment),

flutter_client/lib/shared/widgets/track_actions/track_actions_button.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 
 import '../../../models/track.dart';
 import '../../../theme/theme_extension.dart';
@@ -29,7 +30,7 @@ class TrackActionsButton extends StatelessWidget {
   Widget build(BuildContext context) {
     final fs = Theme.of(context).extension<FabledSwordTheme>()!;
     return IconButton(
-      icon: Icon(Icons.more_vert, color: fs.ash, size: 18),
+      icon: Icon(LucideIcons.ellipsis_vertical, color: fs.ash, size: 18),
       tooltip: 'Track actions',
       onPressed: () => TrackActionsSheet.show(
         context,

flutter_client/lib/shared/widgets/track_actions/track_actions_sheet.dart

@@ -1,5 +1,6 @@
 import 'package:drift/drift.dart' as drift;
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -73,7 +74,7 @@ class TrackActionsSheet extends ConsumerWidget {
             if (!hideQueueActions) ...[
               _MenuItem(
                 key: const Key('track_actions_play_next'),
-                icon: Icons.playlist_play,
+                icon: LucideIcons.list_video,
                 label: 'Play next',
                 onTap: () async {
                   Navigator.pop(context);
@@ -87,7 +88,7 @@ class TrackActionsSheet extends ConsumerWidget {
               ),
               _MenuItem(
                 key: const Key('track_actions_enqueue'),
-                icon: Icons.queue_music,
+                icon: LucideIcons.list_music,
                 label: 'Add to queue',
                 onTap: () async {
                   Navigator.pop(context);
@@ -103,7 +104,7 @@ class TrackActionsSheet extends ConsumerWidget {
             ],
             _MenuItem(
               key: const Key('track_actions_like'),
-              icon: liked ? Icons.favorite : Icons.favorite_border,
+              icon: LucideIcons.heart,
               label: liked ? 'Unlike' : 'Like',
               onTap: () async {
                 Navigator.pop(context);
@@ -112,7 +113,7 @@ class TrackActionsSheet extends ConsumerWidget {
             ),
             _MenuItem(
               key: const Key('track_actions_add_to_playlist'),
-              icon: Icons.playlist_add,
+              icon: LucideIcons.list_plus,
               label: 'Add to playlist…',
               onTap: () async {
                 Navigator.pop(context);
@@ -136,7 +137,7 @@ class TrackActionsSheet extends ConsumerWidget {
             ),
             _MenuItem(
               key: const Key('track_actions_start_radio'),
-              icon: Icons.radio,
+              icon: LucideIcons.radio,
               label: 'Start radio',
               onTap: () async {
                 Navigator.pop(context);
@@ -154,7 +155,7 @@ class TrackActionsSheet extends ConsumerWidget {
             const _Divider(),
             _MenuItem(
               key: const Key('track_actions_go_to_album'),
-              icon: Icons.album,
+              icon: LucideIcons.disc_3,
               label: 'Go to album',
               onTap: () {
                 Navigator.pop(context);
@@ -168,7 +169,7 @@ class TrackActionsSheet extends ConsumerWidget {
             ),
             _MenuItem(
               key: const Key('track_actions_go_to_artist'),
-              icon: Icons.person,
+              icon: LucideIcons.user,
               label: 'Go to artist',
               onTap: () {
                 Navigator.pop(context);
@@ -183,7 +184,7 @@ class TrackActionsSheet extends ConsumerWidget {
             const _Divider(),
             _MenuItem(
               key: const Key('track_actions_hide'),
-              icon: hidden ? Icons.visibility : Icons.visibility_off,
+              icon: hidden ? LucideIcons.eye : LucideIcons.eye_off,
               label: hidden ? 'Unhide' : 'Hide',
               onTap: () async {
                 Navigator.pop(context);

flutter_client/lib/shared/widgets/version_gate.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:pub_semver/pub_semver.dart';
@@ -238,7 +239,7 @@ class VersionTooOldBanner extends ConsumerWidget {
         color: fs.error.withValues(alpha: 0.15),
         padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
         child: Row(children: [
-          Icon(Icons.warning_amber_rounded, color: fs.error, size: 18),
+          Icon(LucideIcons.triangle_alert, color: fs.error, size: 18),
           const SizedBox(width: 8),
           Expanded(
             child: Text(

flutter_client/lib/update/update_banner.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../theme/theme_extension.dart';
@@ -66,7 +67,7 @@ class _UpdateBannerState extends ConsumerState<UpdateBanner> {
           child: Row(
             crossAxisAlignment: CrossAxisAlignment.center,
             children: [
-              Icon(Icons.system_update, color: fs.parchment, size: 16),
+              Icon(LucideIcons.download, color: fs.parchment, size: 16),
               const SizedBox(width: 8),
               Expanded(
                 child: Column(
@@ -132,7 +133,7 @@ class _UpdateBannerState extends ConsumerState<UpdateBanner> {
                   tooltip: 'Dismiss',
                   padding: EdgeInsets.zero,
                   iconSize: 16,
-                  icon: Icon(Icons.close, color: fs.ash),
+                  icon: Icon(LucideIcons.x, color: fs.ash),
                   onPressed: () => _onDismiss(info),
                 ),
               ),

flutter_client/pubspec.yaml

@@ -1,7 +1,7 @@
 name: minstrel
 description: Minstrel mobile client
 publish_to: 'none'
-version: 2026.5.15+7
+version: 2026.5.19+11
 
 environment:
   sdk: '>=3.5.0 <4.0.0'
@@ -14,9 +14,20 @@ dependencies:
   dio: ^5.7.0
   just_audio: ^0.10.5
   audio_service: ^0.18.15
+  # Audio focus + interruptions + becoming-noisy. just_audio auto-manages
+  # session activation once configured; the app must still handle
+  # interruption/becoming-noisy itself (just_audio does not). Same author
+  # as just_audio/audio_service so versions track together.
+  audio_session: ^0.2.3
   flutter_secure_storage: ^10.1.0
   go_router: ^17.2.3
   flutter_svg: ^2.0.16
+  # Lucide icon set (design system mandates Lucide, not Material).
+  # Icons exposed as LucideIcons.<snake_case> IconData usable in Icon().
+  flutter_lucide: ^1.11.0
+  # Runtime POST_NOTIFICATIONS request (Android 13+ denies-by-default
+  # until asked; the media notification is suppressed without it).
+  permission_handler: ^12.0.1
   google_fonts: ^8.1.0
   # 10.x conflicts with flutter_secure_storage 10.x on win32. Hold at 8.3.1
   # until either lib bumps win32 to 6.x.

flutter_client/test/playlists/widgets/playlist_card_test.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_lucide/flutter_lucide.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_test/flutter_test.dart';
 
@@ -67,7 +68,7 @@ void main() {
         body: PlaylistCard(playlist: _forYou),
       ),
     )));
-    expect(find.byIcon(Icons.more_vert), findsOneWidget);
+    expect(find.byIcon(LucideIcons.ellipsis_vertical), findsOneWidget);
   });
 
   testWidgets('no refresh kebab on user playlists', (tester) async {
@@ -78,6 +79,6 @@ void main() {
         body: PlaylistCard(playlist: _userPlaylist),
       ),
     )));
-    expect(find.byIcon(Icons.more_vert), findsNothing);
+    expect(find.byIcon(LucideIcons.ellipsis_vertical), findsNothing);
   });
 }

internal/api/admin_cover_sources_test.go

@@ -27,7 +27,7 @@ func (p *apiTestAlbumProvider) DisplayName() string                         { re
 func (p *apiTestAlbumProvider) RequiresAPIKey() bool                        { return false }
 func (p *apiTestAlbumProvider) DefaultEnabled() bool                        { return true }
 func (p *apiTestAlbumProvider) Configure(_ coverart.ProviderSettings) error { return nil }
-func (p *apiTestAlbumProvider) FetchAlbumCover(_ context.Context, _ string) ([]byte, error) {
+func (p *apiTestAlbumProvider) FetchAlbumCover(_ context.Context, _ coverart.AlbumRef) ([]byte, error) {
 	return []byte("img"), nil
 }
 

internal/api/admin_covers.go

@@ -48,19 +48,20 @@ func (h *handlers) handleAdminAlbumRefetchCover(w http.ResponseWriter, r *http.R
 }
 
 type adminBulkRefetchResp struct {
-	Queued int `json:"queued"`
+	Started bool `json:"started"`
 }
 
 // handleAdminBulkRefetchCovers implements POST /api/admin/covers/refetch-missing.
-// Returns immediately; actual drain runs in a background goroutine bounded by
-// the configured backfill cap.
+// Returns immediately; the drain runs UNBOUNDED in a background goroutine
+// (#388 — no global cap; remote providers self-throttle per provider, local
+// sources run at disk speed). The count is unknowable synchronously, so the
+// response just acknowledges the drain started.
 func (h *handlers) handleAdminBulkRefetchCovers(w http.ResponseWriter, _ *http.Request) {
-	cap := h.coverArtBackfillCap
 	go func() {
 		bgCtx := context.Background()
-		if _, err := h.coverart.EnrichRetryMissing(bgCtx, cap); err != nil {
+		if _, err := h.coverart.EnrichRetryMissing(bgCtx, -1); err != nil {
 			h.logger.Warn("admin: bulk cover refetch failed", "err", err)
 		}
 	}()
-	writeJSON(w, http.StatusOK, adminBulkRefetchResp{Queued: cap})
+	writeJSON(w, http.StatusOK, adminBulkRefetchResp{Started: true})
 }

internal/api/admin_covers_test.go

@@ -53,7 +53,6 @@ func testHandlersWithCovers(t *testing.T) (*handlers, *coverart.Enricher) {
 	}
 	enricher := coverart.NewEnricher(pool, slog.Default(), settings)
 	h.coverart = enricher
-	h.coverArtBackfillCap = 100
 	return h, enricher
 }
 
@@ -97,7 +96,7 @@ func TestAdminAlbumRefetchCover_AdminOK(t *testing.T) {
 	}
 }
 
-func TestAdminBulkRefetchCovers_AdminReturnsQueuedCount(t *testing.T) {
+func TestAdminBulkRefetchCovers_AdminStartsRefetch(t *testing.T) {
 	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
 		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
 	}
@@ -115,8 +114,8 @@ func TestAdminBulkRefetchCovers_AdminReturnsQueuedCount(t *testing.T) {
 	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
 		t.Fatalf("decode: %v", err)
 	}
-	if resp.Queued != h.coverArtBackfillCap {
-		t.Errorf("queued = %d, want %d (cap)", resp.Queued, h.coverArtBackfillCap)
+	if !resp.Started {
+		t.Errorf("started = false, want true (bulk refetch should acknowledge)")
 	}
 }
 

internal/api/admin_lidarr_test.go

@@ -137,8 +137,9 @@ func TestHandlePutLidarrConfig_EmptyKeyPreservesSaved(t *testing.T) {
 		APIKey:  "originalkey",
 	})
 
-	// PUT with empty api_key — should preserve "originalkey".
-	body := []byte(`{"enabled":true,"base_url":"http://lidarr.lan:8686","api_key":""}`)
+	// PUT with empty api_key — should preserve "originalkey". enabled=true
+	// requires the defaults gate (missing_defaults) to be satisfied.
+	body := []byte(`{"enabled":true,"base_url":"http://lidarr.lan:8686","api_key":"","default_quality_profile_id":1,"default_metadata_profile_id":1,"default_root_folder_path":"/music"}`)
 	w := doAdminReq(t, h, http.MethodPut, "/api/admin/lidarr/config", body, admin)
 	if w.Code != http.StatusOK {
 		t.Fatalf("status = %d, want 200; body = %s", w.Code, w.Body.String())
@@ -183,7 +184,7 @@ func TestHandlePutLidarrConfig_HappyPath(t *testing.T) {
 	resetLidarrState(t, h)
 	admin := seedAdminUser(t, h)
 
-	body := []byte(`{"enabled":true,"base_url":"http://lidarr.lan:8686","api_key":"newkey","default_quality_profile_id":2,"default_root_folder_path":"/music"}`)
+	body := []byte(`{"enabled":true,"base_url":"http://lidarr.lan:8686","api_key":"newkey","default_quality_profile_id":2,"default_metadata_profile_id":1,"default_root_folder_path":"/music"}`)
 	w := doAdminReq(t, h, http.MethodPut, "/api/admin/lidarr/config", body, admin)
 	if w.Code != http.StatusOK {
 		t.Fatalf("status = %d, want 200; body = %s", w.Code, w.Body.String())

internal/api/admin_requests_test.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 
 	"github.com/go-chi/chi/v5"
@@ -174,10 +175,17 @@ func TestHandleApproveRequest_HappyPath(t *testing.T) {
 	h, _ := testHandlersWithClientFn(t)
 	resetLidarrState(t, h)
 
-	stub := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+	stub := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
-		_, _ = w.Write([]byte(`{"id":1}`))
+		switch {
+		case strings.Contains(r.URL.Path, "/metadataprofile"):
+			_, _ = w.Write([]byte(`[{"id":1,"name":"Standard"}]`))
+		case strings.Contains(r.URL.Path, "/qualityprofile"):
+			_, _ = w.Write([]byte(`[{"id":1,"name":"Lossless"}]`))
+		default:
+			_, _ = w.Write([]byte(`{"id":1}`))
+		}
 	}))
 	t.Cleanup(stub.Close)
 
@@ -221,7 +229,14 @@ func TestHandleApproveRequest_OverrideUsed(t *testing.T) {
 		}
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
-		_, _ = w.Write([]byte(`{"id":1}`))
+		switch {
+		case strings.Contains(r.URL.Path, "/metadataprofile"):
+			_, _ = w.Write([]byte(`[{"id":1,"name":"Standard"}]`))
+		case strings.Contains(r.URL.Path, "/qualityprofile"):
+			_, _ = w.Write([]byte(`[{"id":1,"name":"Lossless"}]`))
+		default:
+			_, _ = w.Write([]byte(`{"id":1}`))
+		}
 	}))
 	t.Cleanup(stub.Close)
 
@@ -272,9 +287,12 @@ func TestHandleApproveRequest_OverrideUsed(t *testing.T) {
 	}
 }
 
-// TestHandleApproveRequest_LidarrUnreachable_503 points config at an unreachable
-// port and verifies POST /approve → 503 lidarr_unreachable, row stays pending.
-func TestHandleApproveRequest_LidarrUnreachable_503(t *testing.T) {
+// TestHandleApproveRequest_LidarrUnreachable_ApprovesDeferred points config
+// at an unreachable port and verifies the durable-approve contract: POST
+// /approve still succeeds (200) and the request becomes approved with the
+// Lidarr add deferred (lidarr_add_confirmed_at NULL) for the reconciler to
+// retry — the admin's decision is never lost to a transient Lidarr outage.
+func TestHandleApproveRequest_LidarrUnreachable_ApprovesDeferred(t *testing.T) {
 	h, _ := testHandlersWithClientFn(t)
 	resetLidarrState(t, h)
 
@@ -286,31 +304,39 @@ func TestHandleApproveRequest_LidarrUnreachable_503(t *testing.T) {
 	rv := seedPendingArtistRequest(t, h, alice, "artist-mbid-unreachable", "Unreachable")
 
 	w := doAdminRequestReq(t, h, http.MethodPost, "/api/admin/requests/"+uuidToString(rv.ID)+"/approve", nil, admin)
-	if w.Code != http.StatusServiceUnavailable {
-		t.Fatalf("status = %d, want 503; body = %s", w.Code, w.Body.String())
-	}
-	var resp map[string]string
-	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
-		t.Fatalf("decode: %v; body = %s", err, w.Body.String())
-	}
-	if resp["error"] != "lidarr_unreachable" {
-		t.Errorf("error = %q, want lidarr_unreachable", resp["error"])
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d, want 200 (durable approve despite Lidarr down); body = %s", w.Code, w.Body.String())
 	}
 
-	// Row must still be pending.
-	rows, err := h.lidarrRequests.ListByStatus(context.Background(), "pending", 10)
+	// Must no longer be pending.
+	pending, err := h.lidarrRequests.ListByStatus(context.Background(), "pending", 10)
 	if err != nil {
 		t.Fatalf("list pending: %v", err)
 	}
-	found := false
-	for _, r := range rows {
+	for _, r := range pending {
 		if r.ID == rv.ID {
-			found = true
+			t.Error("row still pending after durable approve")
+		}
+	}
+
+	// Must be approved with the add deferred (confirmed_at NULL) so the
+	// reconciler retries it — not failed, not lost.
+	approved, err := h.lidarrRequests.ListByStatus(context.Background(), "approved", 10)
+	if err != nil {
+		t.Fatalf("list approved: %v", err)
+	}
+	var got *dbq.LidarrRequest
+	for i := range approved {
+		if approved[i].ID == rv.ID {
+			got = &approved[i]
 			break
 		}
 	}
-	if !found {
-		t.Error("row is no longer pending after failed approve")
+	if got == nil {
+		t.Fatalf("row %s not in approved after approve with Lidarr down", uuidToString(rv.ID))
+	}
+	if got.LidarrAddConfirmedAt.Valid {
+		t.Error("lidarr_add_confirmed_at set despite Lidarr unreachable; want NULL (deferred to reconciler)")
 	}
 }
 

internal/api/admin_users_test.go

@@ -163,7 +163,10 @@ func TestAdminCreateUser_DuplicateUsername_409(t *testing.T) {
 	admin := seedUser(t, pool, "duper", "pw", true)
 	seedUser(t, pool, "existing", "pw", false)
 
-	body := `{"username":"existing","password":"abcd1234"}`
+	// seedUser prefixes usernames with dbtest.TestUserPrefix, so the
+	// row above is "test-existing"; POST that exact name to actually
+	// collide (stays test-prefixed for ResetDB).
+	body := `{"username":"test-existing","password":"abcd1234"}`
 	req := httptest.NewRequest(http.MethodPost, "/api/admin/users", bytes.NewReader([]byte(body)))
 	req = withUser(req, admin)
 	rec := httptest.NewRecorder()

internal/api/api.go

@@ -28,26 +28,25 @@ import (
 // Mount attaches /api/* handlers to r. Public endpoints (login) are outside
 // RequireUser; everything else is gated by the middleware. The events writer
 // is shared with the Subsonic mount so /rest/scrobble feeds the same store.
-func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playevents.Writer, recCfg config.RecommendationConfig, lidarrCfg *lidarrconfig.Service, lidarrReqs *lidarrrequests.Service, lidarrQuar *lidarrquarantine.Service, tracksSvc *tracks.Service, playlistsSvc *playlists.Service, coverEnricher *coverart.Enricher, coverBackfillCap int, coverSettings *coverart.SettingsService, scanner *library.Scanner, scanCfg library.RunScanConfig, scheduler *library.Scheduler, dataDir string, sender mailer.Sender, bus *eventbus.Bus, playlistScheduler *playlists.Scheduler) {
+func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playevents.Writer, recCfg config.RecommendationConfig, lidarrCfg *lidarrconfig.Service, lidarrReqs *lidarrrequests.Service, lidarrQuar *lidarrquarantine.Service, tracksSvc *tracks.Service, playlistsSvc *playlists.Service, coverEnricher *coverart.Enricher, coverSettings *coverart.SettingsService, scanner *library.Scanner, scanCfg library.RunScanConfig, scheduler *library.Scheduler, dataDir string, sender mailer.Sender, bus *eventbus.Bus, playlistScheduler *playlists.Scheduler) {
 	rng := rand.New(rand.NewSource(rand.Int63()))
 	h := &handlers{
 		pool: pool, logger: logger, events: events, recCfg: recCfg,
-		rng:                 rng.Float64,
-		lidarrCfg:           lidarrCfg,
-		lidarrRequests:      lidarrReqs,
-		lidarrQuarantine:    lidarrQuar,
-		tracks:              tracksSvc,
-		playlists:           playlistsSvc,
-		coverart:            coverEnricher,
-		coverArtBackfillCap: coverBackfillCap,
-		coverSettings:       coverSettings,
-		scanner:             scanner,
-		scanCfg:             scanCfg,
-		scheduler:           scheduler,
-		dataDir:             dataDir,
-		mailer:              sender,
-		eventbus:            bus,
-		playlistScheduler:   playlistScheduler,
+		rng:               rng.Float64,
+		lidarrCfg:         lidarrCfg,
+		lidarrRequests:    lidarrReqs,
+		lidarrQuarantine:  lidarrQuar,
+		tracks:            tracksSvc,
+		playlists:         playlistsSvc,
+		coverart:          coverEnricher,
+		coverSettings:     coverSettings,
+		scanner:           scanner,
+		scanCfg:           scanCfg,
+		scheduler:         scheduler,
+		dataDir:           dataDir,
+		mailer:            sender,
+		eventbus:          bus,
+		playlistScheduler: playlistScheduler,
 	}
 
 	r.Route("/api", func(api chi.Router) {
@@ -180,24 +179,23 @@ func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playev
 }
 
 type handlers struct {
-	pool                *pgxpool.Pool
-	logger              *slog.Logger
-	events              *playevents.Writer
-	recCfg              config.RecommendationConfig
-	rng                 func() float64
-	lidarrCfg           *lidarrconfig.Service
-	lidarrRequests      *lidarrrequests.Service
-	lidarrQuarantine    *lidarrquarantine.Service
-	tracks              *tracks.Service
-	playlists           *playlists.Service
-	coverart            *coverart.Enricher
-	coverArtBackfillCap int
-	coverSettings       *coverart.SettingsService
-	scanner             *library.Scanner
-	scanCfg             library.RunScanConfig
-	scheduler           *library.Scheduler
-	dataDir             string
-	mailer              mailer.Sender
-	eventbus            *eventbus.Bus
-	playlistScheduler   *playlists.Scheduler
+	pool              *pgxpool.Pool
+	logger            *slog.Logger
+	events            *playevents.Writer
+	recCfg            config.RecommendationConfig
+	rng               func() float64
+	lidarrCfg         *lidarrconfig.Service
+	lidarrRequests    *lidarrrequests.Service
+	lidarrQuarantine  *lidarrquarantine.Service
+	tracks            *tracks.Service
+	playlists         *playlists.Service
+	coverart          *coverart.Enricher
+	coverSettings     *coverart.SettingsService
+	scanner           *library.Scanner
+	scanCfg           library.RunScanConfig
+	scheduler         *library.Scheduler
+	dataDir           string
+	mailer            mailer.Sender
+	eventbus          *eventbus.Bus
+	playlistScheduler *playlists.Scheduler
 }

internal/api/library_test.go

@@ -444,7 +444,7 @@ func TestRoutesRegisteredInMount(t *testing.T) {
 	r := chi.NewRouter()
 	w := playevents.NewWriter(h.pool, slog.New(slog.NewTextHandler(io.Discard, nil)),
 		30*time.Minute, 0.5, 30000)
-	Mount(r, h.pool, h.logger, w, config.RecommendationConfig{RadioSize: 50, RadioSizeMax: 200, RecentlyPlayedHours: 1}, h.lidarrCfg, h.lidarrRequests, h.lidarrQuarantine, h.tracks, h.playlists, h.coverart, h.coverArtBackfillCap, h.coverSettings, h.scanner, h.scanCfg, nil, h.dataDir, nil, eventbus.New(), nil)
+	Mount(r, h.pool, h.logger, w, config.RecommendationConfig{RadioSize: 50, RadioSizeMax: 200, RecentlyPlayedHours: 1}, h.lidarrCfg, h.lidarrRequests, h.lidarrQuarantine, h.tracks, h.playlists, h.coverart, h.coverSettings, h.scanner, h.scanCfg, nil, h.dataDir, nil, eventbus.New(), nil)
 
 	paths := []string{
 		"/api/artists",

internal/api/me_timezone_test.go

@@ -69,14 +69,18 @@ func TestPutTimezone_InvalidIANA(t *testing.T) {
 		t.Fatalf("status = %d, want 400; body=%s", rec.Code, rec.Body.String())
 	}
 
+	// Error envelope is nested: {"error":{"code":...}} (matches the
+	// rest of /api/*), not a top-level {"code":...}.
 	var errResp struct {
-		Code string `json:"code"`
+		Error struct {
+			Code string `json:"code"`
+		} `json:"error"`
 	}
 	if err := json.NewDecoder(rec.Body).Decode(&errResp); err != nil {
 		t.Fatalf("decode err response: %v", err)
 	}
-	if errResp.Code != "invalid_timezone" {
-		t.Errorf("error code = %q, want invalid_timezone", errResp.Code)
+	if errResp.Error.Code != "invalid_timezone" {
+		t.Errorf("error code = %q, want invalid_timezone", errResp.Error.Code)
 	}
 }
 

internal/api/playlists_system_test.go

@@ -8,8 +8,6 @@ import (
 	"testing"
 
 	"github.com/go-chi/chi/v5"
-
-	"git.fabledsword.com/bvandeusen/minstrel/internal/auth"
 )
 
 // Generic registry-driven system-playlist endpoints (#411 R2).
@@ -17,7 +15,11 @@ import (
 func newSystemPlaylistRouter(h *handlers) chi.Router {
 	r := chi.NewRouter()
 	r.Route("/api", func(api chi.Router) {
-		api.Use(auth.RequireUser(h.pool))
+		// No real auth.RequireUser middleware: like every other api
+		// handler test, auth is supplied via withUser() context and the
+		// handlers self-guard with requireUser() (prelude.go). The real
+		// middleware needs a live session and would 401 the injected
+		// test user.
 		api.Post("/playlists/system/{kind}/refresh", h.handleSystemPlaylistRefresh)
 		api.Get("/playlists/system/{kind}/shuffle", h.handleSystemPlaylistShuffle)
 	})

internal/api/prelude.go

@@ -19,7 +19,7 @@ import (
 func requireUser(w http.ResponseWriter, r *http.Request) (dbq.User, bool) {
 	user, ok := auth.UserFromContext(r.Context())
 	if !ok {
-		writeErr(w, apierror.Unauthorized("auth_required", ""))
+		writeErr(w, apierror.Unauthorized("unauthenticated", ""))
 		return dbq.User{}, false
 	}
 	return user, true

internal/api/suggestions.go

@@ -1,12 +1,15 @@
 package api
 
 import (
+	"context"
 	"net/http"
 	"strconv"
+	"sync"
 
 	"github.com/jackc/pgx/v5/pgtype"
 
 	"git.fabledsword.com/bvandeusen/minstrel/internal/apierror"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarr"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/recommendation"
 )
 
@@ -16,6 +19,11 @@ type suggestionView struct {
 	Name        string                 `json:"name"`
 	Score       float64                `json:"score"`
 	Attribution []seedContributionView `json:"attribution"`
+	// ImageURL is resolved on-demand from Lidarr (out-of-library
+	// artists have no local art row). Omitted when Lidarr is disabled
+	// or has no match — the client falls back to a placeholder. Not
+	// cached: a remote URL Lidarr surfaced, fetched by the browser.
+	ImageURL string `json:"image_url,omitempty"`
 }
 
 type seedContributionView struct {
@@ -80,5 +88,52 @@ func (h *handlers) handleListSuggestions(w http.ResponseWriter, r *http.Request)
 			MBID: s.MBID, Name: s.Name, Score: s.Score, Attribution: attr,
 		})
 	}
+	h.resolveSuggestionArt(r.Context(), out)
 	writeJSON(w, http.StatusOK, out)
 }
+
+// resolveSuggestionArt fills ImageURL on-demand from Lidarr's artist
+// lookup, matched by MBID (foreignArtistId). Best-effort and cache-free:
+// Lidarr is the only source — when it's disabled, unreachable, or has
+// no match for a candidate, that entry keeps an empty ImageURL and the
+// client renders its placeholder. Lookups run with bounded concurrency
+// so a full Discover page doesn't serialize ~12 round-trips. Never
+// fails the request; the suggestions list is the contract, art is a
+// nicety.
+func (h *handlers) resolveSuggestionArt(ctx context.Context, views []suggestionView) {
+	if len(views) == 0 {
+		return
+	}
+	cfg, err := h.lidarrCfg.Get(ctx)
+	if err != nil || !cfg.Enabled || cfg.BaseURL == "" || cfg.APIKey == "" {
+		return // Lidarr off / unconfigured → placeholders only
+	}
+	client := lidarr.NewClient(cfg.BaseURL, cfg.APIKey)
+
+	const maxConcurrent = 6
+	sem := make(chan struct{}, maxConcurrent)
+	var wg sync.WaitGroup
+	for i := range views {
+		if views[i].MBID == "" || views[i].Name == "" {
+			continue
+		}
+		wg.Add(1)
+		sem <- struct{}{}
+		go func(idx int) {
+			defer wg.Done()
+			defer func() { <-sem }()
+			results, lerr := client.LookupArtist(ctx, views[idx].Name)
+			if lerr != nil {
+				return // best-effort: no art on lookup failure
+			}
+			for _, res := range results {
+				if res.MBID == views[idx].MBID && res.ImageURL != "" {
+					// Distinct slice index per goroutine → race-free.
+					views[idx].ImageURL = res.ImageURL
+					return
+				}
+			}
+		}(i)
+	}
+	wg.Wait()
+}

internal/audit/audit_test.go

@@ -65,7 +65,9 @@ func TestWrite_WithMetadata(t *testing.T) {
 	).Scan(&meta); err != nil {
 		t.Fatalf("read metadata: %v", err)
 	}
-	if !contains(meta, `"first_admin":true`) || !contains(meta, `"reason":"test"`) {
+	// Postgres jsonb::text renders a space after ':' and ',', e.g.
+	// {"reason": "test", "first_admin": true}.
+	if !contains(meta, `"first_admin": true`) || !contains(meta, `"reason": "test"`) {
 		t.Errorf("metadata = %q, expected first_admin + reason fields", meta)
 	}
 }

internal/config/config.go

@@ -56,11 +56,10 @@ type LogConfig struct {
 }
 
 type LibraryConfig struct {
-	ScanPaths           []string `yaml:"scan_paths"`
-	ScanOnStartup       bool     `yaml:"scan_on_startup"`
-	CoverArtFromMBCAA   bool     `yaml:"coverart_from_mbcaa"`   // default true
-	CoverArtBackfillCap int      `yaml:"coverart_backfill_cap"` // default 500
-	ContactEmail        string   `yaml:"contact_email"`         // optional override for MBCAA UA
+	ScanPaths         []string `yaml:"scan_paths"`
+	ScanOnStartup     bool     `yaml:"scan_on_startup"`
+	CoverArtFromMBCAA bool     `yaml:"coverart_from_mbcaa"` // default true
+	ContactEmail      string   `yaml:"contact_email"`       // optional override for MBCAA UA
 }
 
 // SubsonicConfig controls wire-format concessions on the /rest/* surface.
@@ -120,8 +119,7 @@ func Default() Config {
 			RadioSizeMax:        200,
 		},
 		Library: LibraryConfig{
-			CoverArtFromMBCAA:   true,
-			CoverArtBackfillCap: 500,
+			CoverArtFromMBCAA: true,
 		},
 	}
 }
@@ -177,11 +175,6 @@ func applyEnv(cfg *Config) {
 			cfg.Library.CoverArtFromMBCAA = b
 		}
 	}
-	if v, ok := os.LookupEnv("MINSTREL_LIBRARY_COVERART_BACKFILL_CAP"); ok {
-		if n, err := strconv.Atoi(v); err == nil {
-			cfg.Library.CoverArtBackfillCap = n
-		}
-	}
 	if v, ok := os.LookupEnv("MINSTREL_CONTACT_EMAIL"); ok {
 		cfg.Library.ContactEmail = v
 	}

internal/coverart/artist_enricher.go

@@ -144,15 +144,21 @@ func (e *Enricher) recordArtistArt(ctx context.Context, artistID pgtype.UUID, th
 // errored). The JSON tally written to scan_runs keeps the existing
 // processed/succeeded/failed shape for backwards compat with the
 // admin overview UI; the log line is the operator's diagnostic.
+// limit: 0 = stage disabled; >0 = bounded; <0 = unbounded (#388 —
+// no global cap; remote providers self-throttle per provider).
 func (e *Enricher) EnrichArtistBatch(ctx context.Context, limit int, dataDir string,
 	progressCb func(processed, succeeded, failed int)) (processed, succeeded, failed int, err error) {
-	if limit <= 0 {
+	if limit == 0 {
 		return 0, 0, 0, nil
 	}
+	queryLimit := int32(limit)
+	if limit < 0 {
+		queryLimit = 1<<31 - 1 // unbounded
+	}
 	q := dbq.New(e.pool)
 	rows, qerr := q.ListArtistsMissingArt(ctx, dbq.ListArtistsMissingArtParams{
 		ArtistArtSourcesVersion: e.settings.CurrentVersion(),
-		Limit:                   int32(limit),
+		Limit:                   queryLimit,
 	})
 	if qerr != nil {
 		return 0, 0, 0, fmt.Errorf("list missing artist art: %w", qerr)

internal/coverart/artist_enricher_test.go

@@ -496,7 +496,7 @@ func TestCleanupArtistArt_IdempotentMissingDir(t *testing.T) {
 
 // --- MBID guard ---
 
-func TestEnrichArtist_NoMBID_LeavesNull(t *testing.T) {
+func TestEnrichArtist_NoMBID_SettlesNone(t *testing.T) {
 	pool := newPool(t)
 	ctx := context.Background()
 	q := dbq.New(pool)
@@ -504,9 +504,13 @@ func TestEnrichArtist_NoMBID_LeavesNull(t *testing.T) {
 	resetRegistryForTests()
 	t.Cleanup(resetRegistryForTests)
 
+	// No MBID still runs the provider chain (name-based providers can
+	// resolve without one). An MBID-only provider returns ErrNotFound
+	// for an empty MBID; with the whole chain returning ErrNotFound the
+	// row settles 'none' (version-stamped), NOT NULL.
 	stub := &stubArtistProvider{
 		fakeProvider: fakeProvider{id: "stub-artist", defaultOn: true},
-		thumb:        []byte("should_not_write"),
+		err:          ErrNotFound,
 	}
 	Register(stub)
 
@@ -523,7 +527,7 @@ func TestEnrichArtist_NoMBID_LeavesNull(t *testing.T) {
 	if err != nil {
 		t.Fatalf("GetArtistByID: %v", err)
 	}
-	if row.ArtistArtSource != nil {
-		t.Errorf("source = %v, want nil (no MBID — skip)", row.ArtistArtSource)
+	if row.ArtistArtSource == nil || *row.ArtistArtSource != "none" {
+		t.Errorf("source = %v, want 'none' (settled)", row.ArtistArtSource)
 	}
 }

internal/coverart/enricher.go

@@ -213,15 +213,23 @@ func (e *Enricher) recordAlbumCover(ctx context.Context, albumID pgtype.UUID, pa
 // JSON tally written to scan_runs keeps the existing
 // processed/succeeded/failed shape for backwards compat with the
 // admin overview UI; the log line is the operator's diagnostic.
+// limit semantics: 0 = stage disabled (skip); >0 = bounded batch;
+// <0 = unbounded — walk every album needing art. The global cap was
+// removed (#388); external providers self-throttle via their
+// per-provider httpClient MinInterval, local sources run at disk speed.
 func (e *Enricher) EnrichBatch(ctx context.Context, limit int,
 	progressCb func(processed, succeeded, failed int)) (processed, succeeded, failed int, err error) {
-	if limit <= 0 {
+	if limit == 0 {
 		return 0, 0, 0, nil
 	}
+	queryLimit := int32(limit)
+	if limit < 0 {
+		queryLimit = 1<<31 - 1 // unbounded
+	}
 	q := dbq.New(e.pool)
 	rows, qerr := q.ListAlbumsMissingCover(ctx, dbq.ListAlbumsMissingCoverParams{
 		CoverArtSourcesVersion: e.settings.CurrentVersion(),
-		Limit:                  int32(limit),
+		Limit:                  queryLimit,
 	})
 	if qerr != nil {
 		return 0, 0, 0, fmt.Errorf("list missing: %w", qerr)
@@ -293,12 +301,18 @@ func (e *Enricher) logBatchSummary(stage string, eligible, processed, succeeded,
 // EnrichRetryMissing drains both NULL and 'none' rows. Used by the
 // admin bulk-retry endpoint. Clears 'none' to NULL first so
 // EnrichAlbum picks them up.
+// limit: 0 = no-op; >0 = bounded; <0 = unbounded (retry every
+// missing/none album). Admin bulk-retry passes <0 post-#388.
 func (e *Enricher) EnrichRetryMissing(ctx context.Context, limit int) (int, error) {
-	if limit <= 0 {
+	if limit == 0 {
 		return 0, nil
 	}
+	queryLimit := int32(limit)
+	if limit < 0 {
+		queryLimit = 1<<31 - 1 // unbounded
+	}
 	q := dbq.New(e.pool)
-	rows, err := q.ListAlbumsRetryMissing(ctx, int32(limit))
+	rows, err := q.ListAlbumsRetryMissing(ctx, queryLimit)
 	if err != nil {
 		return 0, fmt.Errorf("list retry missing: %w", err)
 	}

internal/coverart/enricher_test.go

@@ -49,8 +49,11 @@ func discardLogger() *slog.Logger {
 // pick them up.
 func newTestEnricher(t *testing.T, pool *pgxpool.Pool) *Enricher {
 	t.Helper()
-	resetRegistryForTests()
-	t.Cleanup(resetRegistryForTests)
+	// Do NOT reset the registry here: callers register their fakes
+	// before calling this (see doc above) and resetting would wipe them
+	// so reconcile() sees zero providers — every art source then stays
+	// NULL. Registry lifecycle is the caller's (each test does
+	// resetRegistryForTests + t.Cleanup before Register()).
 	s, err := NewSettingsService(context.Background(), pool, discardLogger())
 	if err != nil {
 		t.Fatalf("NewSettingsService: %v", err)
@@ -100,6 +103,8 @@ func TestEnrichAlbum_SidecarFound(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	resetRegistryForTests() // deterministic empty registry (sidecar-only path)
+	t.Cleanup(resetRegistryForTests)
 	e := newTestEnricher(t, pool)
 	if err := e.EnrichAlbum(context.Background(), id); err != nil {
 		t.Fatalf("enrich: %v", err)
@@ -116,9 +121,11 @@ func TestEnrichAlbum_SidecarFound(t *testing.T) {
 	}
 }
 
-func TestEnrichAlbum_NoSidecarNoMBID_LeavesNull(t *testing.T) {
+func TestEnrichAlbum_NoSidecarNoMBID_SettlesNone(t *testing.T) {
 	pool := newPool(t)
 	id, _ := seedAlbumWithTrack(t, pool, "NoMbid", "Artist", "")
+	resetRegistryForTests() // deterministic empty registry (no provider can supply)
+	t.Cleanup(resetRegistryForTests)
 	e := newTestEnricher(t, pool)
 	if err := e.EnrichAlbum(context.Background(), id); err != nil {
 		t.Fatalf("enrich: %v", err)
@@ -127,8 +134,11 @@ func TestEnrichAlbum_NoSidecarNoMBID_LeavesNull(t *testing.T) {
 	if err != nil {
 		t.Fatalf("get: %v", err)
 	}
-	if row.CoverArtSource != nil {
-		t.Errorf("source = %v, want nil (NULL — eligible for retry on next scan)", row.CoverArtSource)
+	// No sidecar, no MBID, no provider yields → the chain settles
+	// 'none' (allWere404 stays true), version-stamped so it is only
+	// re-tried when the registered provider set changes.
+	if row.CoverArtSource == nil || *row.CoverArtSource != "none" {
+		t.Errorf("source = %v, want 'none' (settled)", row.CoverArtSource)
 	}
 }
 
@@ -227,6 +237,8 @@ func TestEnrichAlbum_AlreadySidecar_NoOp(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	resetRegistryForTests() // deterministic empty registry (sidecar-only path)
+	t.Cleanup(resetRegistryForTests)
 	e := newTestEnricher(t, pool)
 	if err := e.EnrichAlbum(context.Background(), id); err != nil {
 		t.Fatalf("first enrich: %v", err)
@@ -253,16 +265,27 @@ func TestEnrichBatch_DrainsNullSourceOnly(t *testing.T) {
 	}
 
 	id2, _ := seedAlbumWithTrack(t, pool, "Drain2", "B", "")
-	// Pre-mark id2 as 'none' with current version — should NOT be drained by EnrichBatch
-	// (ListAlbumsMissingCover only returns stale-version 'none').
+
+	resetRegistryForTests() // deterministic empty registry
+	t.Cleanup(resetRegistryForTests)
+	e := newTestEnricher(t, pool)
+
+	// Pre-mark id2 as 'none' AT the current sources version so
+	// ListAlbumsMissingCover excludes it (it only returns NULL or
+	// stale-version 'none'). SetAlbumCover does NOT stamp the version;
+	// SetAlbumCoverWithVersion does — use the live current version, the
+	// same value EnrichBatch compares against.
+	curVer, err := dbq.New(pool).GetCurrentSourcesVersion(context.Background())
+	if err != nil {
+		t.Fatalf("current version: %v", err)
+	}
 	src := "none"
-	if err := dbq.New(pool).SetAlbumCover(context.Background(), dbq.SetAlbumCoverParams{
-		ID: id2, Column2: "", CoverArtSource: &src,
+	if err := dbq.New(pool).SetAlbumCoverWithVersion(context.Background(), dbq.SetAlbumCoverWithVersionParams{
+		ID: id2, CoverArtPath: nil, CoverArtSource: &src, CoverArtSourcesVersion: curVer,
 	}); err != nil {
 		t.Fatal(err)
 	}
 
-	e := newTestEnricher(t, pool)
 	processed, _, _, err := e.EnrichBatch(context.Background(), 100, nil)
 	if err != nil {
 		t.Fatalf("batch: %v", err)

internal/db/dbq/lidarr_requests.sql.go

@@ -20,7 +20,7 @@ UPDATE lidarr_requests
        decided_by            = $4,
        updated_at            = now()
  WHERE id = $1 AND status = 'pending'
- RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at
+ RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at
 `
 
 type ApproveLidarrRequestParams struct {
@@ -60,6 +60,7 @@ func (q *Queries) ApproveLidarrRequest(ctx context.Context, arg ApproveLidarrReq
 		&i.MatchedArtistID,
 		&i.RequestedAt,
 		&i.UpdatedAt,
+		&i.LidarrAddConfirmedAt,
 	)
 	return i, err
 }
@@ -72,7 +73,7 @@ UPDATE lidarr_requests
        decided_by = $2,
        updated_at = now()
  WHERE id = $1 AND user_id = $2 AND status = 'pending'
- RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at
+ RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at
 `
 
 type CancelLidarrRequestParams struct {
@@ -110,6 +111,7 @@ func (q *Queries) CancelLidarrRequest(ctx context.Context, arg CancelLidarrReque
 		&i.MatchedArtistID,
 		&i.RequestedAt,
 		&i.UpdatedAt,
+		&i.LidarrAddConfirmedAt,
 	)
 	return i, err
 }
@@ -123,7 +125,7 @@ UPDATE lidarr_requests
        completed_at      = now(),
        updated_at        = now()
  WHERE id = $1 AND status = 'approved'
- RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at
+ RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at
 `
 
 type CompleteLidarrRequestParams struct {
@@ -169,6 +171,7 @@ func (q *Queries) CompleteLidarrRequest(ctx context.Context, arg CompleteLidarrR
 		&i.MatchedArtistID,
 		&i.RequestedAt,
 		&i.UpdatedAt,
+		&i.LidarrAddConfirmedAt,
 	)
 	return i, err
 }
@@ -179,7 +182,7 @@ INSERT INTO lidarr_requests (
     lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid,
     artist_name, album_title, track_title
 ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
-RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at
+RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at
 `
 
 type CreateLidarrRequestParams struct {
@@ -227,12 +230,13 @@ func (q *Queries) CreateLidarrRequest(ctx context.Context, arg CreateLidarrReque
 		&i.MatchedArtistID,
 		&i.RequestedAt,
 		&i.UpdatedAt,
+		&i.LidarrAddConfirmedAt,
 	)
 	return i, err
 }
 
 const getLidarrRequestByID = `-- name: GetLidarrRequestByID :one
-SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at FROM lidarr_requests WHERE id = $1
+SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at FROM lidarr_requests WHERE id = $1
 `
 
 func (q *Queries) GetLidarrRequestByID(ctx context.Context, id pgtype.UUID) (LidarrRequest, error) {
@@ -260,6 +264,53 @@ func (q *Queries) GetLidarrRequestByID(ctx context.Context, id pgtype.UUID) (Lid
 		&i.MatchedArtistID,
 		&i.RequestedAt,
 		&i.UpdatedAt,
+		&i.LidarrAddConfirmedAt,
+	)
+	return i, err
+}
+
+const getNonTerminalRequestForMBID = `-- name: GetNonTerminalRequestForMBID :one
+SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at FROM lidarr_requests
+ WHERE status IN ('pending', 'approved', 'completed')
+   AND ((kind = 'artist' AND lidarr_artist_mbid = $1)
+     OR (kind = 'album'  AND lidarr_album_mbid  = $1)
+     OR (kind = 'track'  AND lidarr_track_mbid  = $1))
+ ORDER BY requested_at ASC
+ LIMIT 1
+`
+
+// Returns the oldest non-terminal (pending/approved/completed) request
+// whose own-kind MBID matches @mbid, or pgx.ErrNoRows when none. Create()
+// uses this to dedupe: a re-request for something already in flight
+// returns the existing row instead of inserting a duplicate. MBIDs are
+// globally unique per entity type, so the cross-column OR cannot
+// false-match (an artist MBID never collides with an album/track MBID).
+func (q *Queries) GetNonTerminalRequestForMBID(ctx context.Context, mbid string) (LidarrRequest, error) {
+	row := q.db.QueryRow(ctx, getNonTerminalRequestForMBID, mbid)
+	var i LidarrRequest
+	err := row.Scan(
+		&i.ID,
+		&i.UserID,
+		&i.Status,
+		&i.Kind,
+		&i.LidarrArtistMbid,
+		&i.LidarrAlbumMbid,
+		&i.LidarrTrackMbid,
+		&i.ArtistName,
+		&i.AlbumTitle,
+		&i.TrackTitle,
+		&i.QualityProfileID,
+		&i.RootFolderPath,
+		&i.DecidedAt,
+		&i.DecidedBy,
+		&i.Notes,
+		&i.CompletedAt,
+		&i.MatchedTrackID,
+		&i.MatchedAlbumID,
+		&i.MatchedArtistID,
+		&i.RequestedAt,
+		&i.UpdatedAt,
+		&i.LidarrAddConfirmedAt,
 	)
 	return i, err
 }
@@ -287,7 +338,7 @@ func (q *Queries) HasNonTerminalRequestForMBID(ctx context.Context, mbid string)
 }
 
 const listApprovedLidarrRequestsForReconcile = `-- name: ListApprovedLidarrRequestsForReconcile :many
-SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at FROM lidarr_requests
+SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at FROM lidarr_requests
 WHERE status = 'approved'
 ORDER BY decided_at ASC
 LIMIT $1
@@ -324,6 +375,7 @@ func (q *Queries) ListApprovedLidarrRequestsForReconcile(ctx context.Context, li
 			&i.MatchedArtistID,
 			&i.RequestedAt,
 			&i.UpdatedAt,
+			&i.LidarrAddConfirmedAt,
 		); err != nil {
 			return nil, err
 		}
@@ -336,7 +388,7 @@ func (q *Queries) ListApprovedLidarrRequestsForReconcile(ctx context.Context, li
 }
 
 const listLidarrRequestsByStatus = `-- name: ListLidarrRequestsByStatus :many
-SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at FROM lidarr_requests
+SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at FROM lidarr_requests
 WHERE status = $1
 ORDER BY requested_at DESC
 LIMIT $2
@@ -378,6 +430,7 @@ func (q *Queries) ListLidarrRequestsByStatus(ctx context.Context, arg ListLidarr
 			&i.MatchedArtistID,
 			&i.RequestedAt,
 			&i.UpdatedAt,
+			&i.LidarrAddConfirmedAt,
 		); err != nil {
 			return nil, err
 		}
@@ -390,7 +443,7 @@ func (q *Queries) ListLidarrRequestsByStatus(ctx context.Context, arg ListLidarr
 }
 
 const listLidarrRequestsForUser = `-- name: ListLidarrRequestsForUser :many
-SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at FROM lidarr_requests
+SELECT id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at FROM lidarr_requests
 WHERE user_id = $1
 ORDER BY requested_at DESC
 LIMIT $2
@@ -432,6 +485,7 @@ func (q *Queries) ListLidarrRequestsForUser(ctx context.Context, arg ListLidarrR
 			&i.MatchedArtistID,
 			&i.RequestedAt,
 			&i.UpdatedAt,
+			&i.LidarrAddConfirmedAt,
 		); err != nil {
 			return nil, err
 		}
@@ -443,6 +497,23 @@ func (q *Queries) ListLidarrRequestsForUser(ctx context.Context, arg ListLidarrR
 	return items, nil
 }
 
+const markLidarrRequestAddConfirmed = `-- name: MarkLidarrRequestAddConfirmed :exec
+UPDATE lidarr_requests
+   SET lidarr_add_confirmed_at = now(),
+       updated_at              = now()
+ WHERE id = $1
+   AND status = 'approved'
+   AND lidarr_add_confirmed_at IS NULL
+`
+
+// Idempotently records that Lidarr accepted the add for an approved
+// request. The lidarr_add_confirmed_at IS NULL guard makes a redundant
+// reconciler retry a no-op rather than bumping updated_at every tick.
+func (q *Queries) MarkLidarrRequestAddConfirmed(ctx context.Context, id pgtype.UUID) error {
+	_, err := q.db.Exec(ctx, markLidarrRequestAddConfirmed, id)
+	return err
+}
+
 const rejectLidarrRequest = `-- name: RejectLidarrRequest :one
 UPDATE lidarr_requests
    SET status     = 'rejected',
@@ -451,7 +522,7 @@ UPDATE lidarr_requests
        decided_by = $3,
        updated_at = now()
  WHERE id = $1 AND status = 'pending'
- RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at
+ RETURNING id, user_id, status, kind, lidarr_artist_mbid, lidarr_album_mbid, lidarr_track_mbid, artist_name, album_title, track_title, quality_profile_id, root_folder_path, decided_at, decided_by, notes, completed_at, matched_track_id, matched_album_id, matched_artist_id, requested_at, updated_at, lidarr_add_confirmed_at
 `
 
 type RejectLidarrRequestParams struct {
@@ -485,6 +556,7 @@ func (q *Queries) RejectLidarrRequest(ctx context.Context, arg RejectLidarrReque
 		&i.MatchedArtistID,
 		&i.RequestedAt,
 		&i.UpdatedAt,
+		&i.LidarrAddConfirmedAt,
 	)
 	return i, err
 }

internal/db/dbq/models.go

@@ -325,27 +325,28 @@ type LidarrQuarantineAction struct {
 }
 
 type LidarrRequest struct {
-	ID               pgtype.UUID
-	UserID           pgtype.UUID
-	Status           LidarrRequestStatus
-	Kind             LidarrRequestKind
-	LidarrArtistMbid string
-	LidarrAlbumMbid  *string
-	LidarrTrackMbid  *string
-	ArtistName       string
-	AlbumTitle       *string
-	TrackTitle       *string
-	QualityProfileID *int32
-	RootFolderPath   *string
-	DecidedAt        pgtype.Timestamptz
-	DecidedBy        pgtype.UUID
-	Notes            *string
-	CompletedAt      pgtype.Timestamptz
-	MatchedTrackID   pgtype.UUID
-	MatchedAlbumID   pgtype.UUID
-	MatchedArtistID  pgtype.UUID
-	RequestedAt      pgtype.Timestamptz
-	UpdatedAt        pgtype.Timestamptz
+	ID                   pgtype.UUID
+	UserID               pgtype.UUID
+	Status               LidarrRequestStatus
+	Kind                 LidarrRequestKind
+	LidarrArtistMbid     string
+	LidarrAlbumMbid      *string
+	LidarrTrackMbid      *string
+	ArtistName           string
+	AlbumTitle           *string
+	TrackTitle           *string
+	QualityProfileID     *int32
+	RootFolderPath       *string
+	DecidedAt            pgtype.Timestamptz
+	DecidedBy            pgtype.UUID
+	Notes                *string
+	CompletedAt          pgtype.Timestamptz
+	MatchedTrackID       pgtype.UUID
+	MatchedAlbumID       pgtype.UUID
+	MatchedArtistID      pgtype.UUID
+	RequestedAt          pgtype.Timestamptz
+	UpdatedAt            pgtype.Timestamptz
+	LidarrAddConfirmedAt pgtype.Timestamptz
 }
 
 type PasswordReset struct {

internal/db/dbq/system_mixes.sql.go

@@ -202,8 +202,8 @@ WITH windowed AS (
     SELECT track_id, COUNT(*) AS c
       FROM play_events
      WHERE user_id = $1 AND was_skipped = false
-       AND started_at < now() - interval '60 days'
-       AND ABS(EXTRACT(DOY FROM started_at) - EXTRACT(DOY FROM now())) <= 7
+       AND started_at < now() - interval '30 days'
+       AND ABS(EXTRACT(DOY FROM started_at) - EXTRACT(DOY FROM now())) <= 10
      GROUP BY track_id
 )
 SELECT t.id, t.album_id, t.artist_id
@@ -229,9 +229,12 @@ type ListOnThisDayTracksRow struct {
 }
 
 // #422 On This Day: tracks the user played around this calendar date
-// (±7 day-of-year) in the past, excluding the very recent (>60 days
+// (±10 day-of-year) in the past, excluding the very recent (>30 days
 // ago) so it's nostalgic, not just "last week". Weighted by how much
-// they were played in those windows.
+// they were played in those windows. Floor relaxed from 60→30 days
+// and window ±7→±10 so it surfaces on a months-old library instead
+// of needing a full year of history; still skips cleanly (no rows →
+// no playlist) when there's no qualifying history yet.
 // $1 user_id, $2 date string.
 func (q *Queries) ListOnThisDayTracks(ctx context.Context, arg ListOnThisDayTracksParams) ([]ListOnThisDayTracksRow, error) {
 	rows, err := q.db.Query(ctx, listOnThisDayTracks, arg.UserID, arg.Column2)
@@ -255,21 +258,41 @@ func (q *Queries) ListOnThisDayTracks(ctx context.Context, arg ListOnThisDayTrac
 
 const listRediscoverTracks = `-- name: ListRediscoverTracks :many
 WITH stats AS (
-    SELECT track_id, COUNT(*) AS c, MAX(started_at) AS last_at
-      FROM play_events
-     WHERE user_id = $1 AND was_skipped = false
-     GROUP BY track_id
+    SELECT pe.track_id, COUNT(*) AS c, MAX(pe.started_at) AS last_at
+      FROM play_events pe
+     WHERE pe.user_id = $1 AND pe.was_skipped = false
+     GROUP BY pe.track_id
+),
+deep AS (
+    SELECT t.id, t.album_id, t.artist_id, s.c, 0 AS tier
+      FROM tracks t
+      JOIN stats s ON s.track_id = t.id
+     WHERE s.c >= 5
+       AND s.last_at <= now() - interval '6 months'
+       AND NOT EXISTS (
+           SELECT 1 FROM lidarr_quarantine q
+            WHERE q.user_id = $1 AND q.track_id = t.id
+       )
+),
+shallow AS (
+    SELECT t.id, t.album_id, t.artist_id, s.c, 1 AS tier
+      FROM tracks t
+      JOIN stats s ON s.track_id = t.id
+     WHERE s.c >= 5
+       AND s.last_at <= now() - interval '30 days'
+       AND NOT EXISTS (
+           SELECT 1 FROM lidarr_quarantine q
+            WHERE q.user_id = $1 AND q.track_id = t.id
+       )
 )
-SELECT t.id, t.album_id, t.artist_id
-  FROM tracks t
-  JOIN stats s ON s.track_id = t.id
- WHERE s.c >= 5
-   AND s.last_at <= now() - interval '6 months'
-   AND NOT EXISTS (
-       SELECT 1 FROM lidarr_quarantine q
-        WHERE q.user_id = $1 AND q.track_id = t.id
-   )
- ORDER BY s.c DESC, t.id
+SELECT id, album_id, artist_id
+  FROM (
+    SELECT id, album_id, artist_id, c, tier FROM deep
+    UNION ALL
+    SELECT id, album_id, artist_id, c, tier FROM shallow
+     WHERE NOT EXISTS (SELECT 1 FROM deep)
+  ) u
+ ORDER BY tier, c DESC, id
  LIMIT 200
 `
 
@@ -280,8 +303,12 @@ type ListRediscoverTracksRow struct {
 }
 
 // #420 Rediscover: tracks the user played a lot (>=5 non-skip) but
-// not in the last 6 months. Ordered by historical affection.
-// $1 user_id.
+// has drifted away from. Tiered so a young library still gets a mix:
+//
+//	tier 0  not played in the last 6 months (true rediscovery)
+//	tier 1  (only if tier 0 empty) not played in the last 30 days
+//
+// Ordered by historical affection. $1 user_id.
 func (q *Queries) ListRediscoverTracks(ctx context.Context, userID pgtype.UUID) ([]ListRediscoverTracksRow, error) {
 	rows, err := q.db.Query(ctx, listRediscoverTracks, userID)
 	if err != nil {

internal/db/dbq/system_playlists.sql.go

@@ -412,23 +412,55 @@ func (q *Queries) PickTopPlayedTrackForArtistByUser(ctx context.Context, arg Pic
 }
 
 const pickTopPlayedTracksForUser = `-- name: PickTopPlayedTracksForUser :many
-SELECT t.id
-  FROM play_events pe
-  JOIN tracks t ON t.id = pe.track_id
- WHERE pe.user_id = $1
-   AND pe.started_at > now() - INTERVAL '7 days'
-   AND pe.was_skipped = false
- GROUP BY t.id
- ORDER BY COUNT(*) DESC, t.id
+WITH recent AS (
+    SELECT t.id, COUNT(*) AS c, 0 AS tier
+      FROM play_events pe
+      JOIN tracks t ON t.id = pe.track_id
+     WHERE pe.user_id = $1
+       AND pe.started_at > now() - INTERVAL '30 days'
+       AND pe.was_skipped = false
+     GROUP BY t.id
+),
+alltime AS (
+    SELECT t.id, COUNT(*) AS c, 1 AS tier
+      FROM play_events pe
+      JOIN tracks t ON t.id = pe.track_id
+     WHERE pe.user_id = $1
+       AND pe.was_skipped = false
+     GROUP BY t.id
+),
+liked AS (
+    SELECT gl.track_id AS id, 0::bigint AS c, 2 AS tier
+      FROM general_likes gl
+     WHERE gl.user_id = $1
+),
+chosen AS (
+    SELECT id, c, tier FROM recent
+    UNION ALL
+    SELECT id, c, tier FROM alltime
+     WHERE NOT EXISTS (SELECT 1 FROM recent)
+    UNION ALL
+    SELECT id, c, tier FROM liked
+     WHERE NOT EXISTS (SELECT 1 FROM recent)
+       AND NOT EXISTS (SELECT 1 FROM alltime)
+)
+SELECT id
+  FROM chosen
+ ORDER BY tier, c DESC, id
  LIMIT 5
 `
 
-// For-You candidate seeds. Returns the user's top-5 most-played
-// non-skipped tracks in the last 7 days; tie-break by track_id for
-// determinism. The Go-side picker (pickForYouSeedForDay) chooses one
-// of the returned rows as today's seed via userIDHash so the
-// candidate pool rotates day-to-day while staying stable within a
-// day.
+// For-You candidate seeds, tiered so For-You never silently vanishes:
+//
+//	tier 0  top non-skip plays in the last 30 days
+//	tier 1  (only if tier 0 empty) all-time top non-skip plays
+//	tier 2  (only if tiers 0+1 empty) liked tracks
+//
+// Returns up to 5 ids; tie-break by track_id for determinism. The
+// Go-side picker (pickForYouSeedForDay) rotates one per day via
+// userIDHash. Widened from a hard 7-day window, which made For-You
+// disappear after a week of not listening and never recover on a
+// self-hosted library with sparse history.
 func (q *Queries) PickTopPlayedTracksForUser(ctx context.Context, userID pgtype.UUID) ([]pgtype.UUID, error) {
 	rows, err := q.db.Query(ctx, pickTopPlayedTracksForUser, userID)
 	if err != nil {

internal/db/dbq/tracks.sql.go

@@ -376,6 +376,41 @@ func (q *Queries) ListTracksByAlbum(ctx context.Context, arg ListTracksByAlbumPa
 	return items, nil
 }
 
+const listTracksMissingMbidWithPath = `-- name: ListTracksMissingMbidWithPath :many
+SELECT id, file_path
+  FROM tracks
+ WHERE mbid IS NULL
+ ORDER BY id
+ LIMIT $1
+`
+
+type ListTracksMissingMbidWithPathRow struct {
+	ID       pgtype.UUID
+	FilePath string
+}
+
+// Track recording-MBID backfill: tracks with NULL mbid that still have
+// a file to re-read. $1 caps the batch (mirrors the album backfill).
+func (q *Queries) ListTracksMissingMbidWithPath(ctx context.Context, limit int32) ([]ListTracksMissingMbidWithPathRow, error) {
+	rows, err := q.db.Query(ctx, listTracksMissingMbidWithPath, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ListTracksMissingMbidWithPathRow
+	for rows.Next() {
+		var i ListTracksMissingMbidWithPathRow
+		if err := rows.Scan(&i.ID, &i.FilePath); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const searchTracks = `-- name: SearchTracks :many
 SELECT id, title, album_id, artist_id, track_number, disc_number, duration_ms, file_path, file_size, file_format, bitrate, mbid, genre, added_at, updated_at FROM tracks
 WHERE title ILIKE '%' || $1::text || '%'
@@ -437,6 +472,24 @@ func (q *Queries) SearchTracks(ctx context.Context, arg SearchTracksParams) ([]T
 	return items, nil
 }
 
+const setTrackMbidIfNull = `-- name: SetTrackMbidIfNull :exec
+UPDATE tracks
+   SET mbid = $2, updated_at = now()
+ WHERE id = $1 AND mbid IS NULL
+`
+
+type SetTrackMbidIfNullParams struct {
+	ID   pgtype.UUID
+	Mbid *string
+}
+
+// Heal a track's recording MBID only while still NULL — idempotent, so
+// re-running the backfill is a no-op for already-healed rows.
+func (q *Queries) SetTrackMbidIfNull(ctx context.Context, arg SetTrackMbidIfNullParams) error {
+	_, err := q.db.Exec(ctx, setTrackMbidIfNull, arg.ID, arg.Mbid)
+	return err
+}
+
 const upsertTrack = `-- name: UpsertTrack :one
 INSERT INTO tracks (
     title, album_id, artist_id, track_number, disc_number,

internal/db/migrations/0029_tracks_mbid_nonunique.down.sql

@@ -0,0 +1,6 @@
+-- Reverts to the unique partial index. This FAILS if any recording
+-- MBID is shared across releases in the library (the exact case 0029
+-- exists to allow) — dedupe tracks.mbid before rolling back.
+
+DROP INDEX IF EXISTS tracks_mbid_idx;
+CREATE UNIQUE INDEX tracks_mbid_unique ON tracks (mbid) WHERE mbid IS NOT NULL;

internal/db/migrations/0029_tracks_mbid_nonunique.up.sql

@@ -0,0 +1,15 @@
+-- tracks.mbid holds the MusicBrainz *recording* MBID — the id the
+-- ListenBrainz similarity pipeline (ListPlayedTracksNeedingSimilarity,
+-- GetTracksByMBIDs) matches on. A single recording legitimately appears
+-- on multiple releases (album + compilation + single), so multiple
+-- tracks rows share one recording MBID.
+--
+-- tracks_mbid_unique (added in 0002, when this column was always NULL
+-- and never populated) wrongly assumes one MBID == one track. Now that
+-- the scanner extracts the recording MBID, that uniqueness throws
+-- 23505 for any recording present on >1 release. Replace it with a
+-- non-unique partial index serving the same lookups. Zero-risk: the
+-- column is 100% NULL at migration time.
+
+DROP INDEX IF EXISTS tracks_mbid_unique;
+CREATE INDEX IF NOT EXISTS tracks_mbid_idx ON tracks (mbid) WHERE mbid IS NOT NULL;

internal/db/migrations/0030_relax_art_source_check_to_nonempty.down.sql

@@ -0,0 +1,15 @@
+-- Restore the 0020 fixed-allowlist CHECKs. FAILS if any row holds a
+-- source value outside the allowlist (the exact case 0030 enables) —
+-- normalise such rows before rolling back.
+
+ALTER TABLE albums DROP CONSTRAINT IF EXISTS albums_cover_art_source_check;
+ALTER TABLE albums
+    ADD CONSTRAINT albums_cover_art_source_check
+    CHECK (cover_art_source IS NULL
+           OR cover_art_source IN ('embedded','sidecar','mbcaa','theaudiodb','deezer','lastfm','none'));
+
+ALTER TABLE artists DROP CONSTRAINT IF EXISTS artists_artist_art_source_check;
+ALTER TABLE artists
+    ADD CONSTRAINT artists_artist_art_source_check
+    CHECK (artist_art_source IS NULL
+           OR artist_art_source IN ('theaudiodb','deezer','lastfm','none'));

internal/db/migrations/0030_relax_art_source_check_to_nonempty.up.sql

@@ -0,0 +1,19 @@
+-- The cover/artist art `*_source` column stores the recording
+-- provider's registry ID. coverart.Register makes the provider set
+-- extensible, so a fixed IN-list CHECK (0016 → 0018 → 0020) required a
+-- schema migration for every new provider and rejected any
+-- out-of-list value (e.g. test stub providers). Same brittleness
+-- class as the discovery-mix CHECK incident (#433): a fixed-value
+-- CHECK fighting an extensible value set. Relax to "NULL or any
+-- non-empty string" — the registry, not the schema, is the source of
+-- truth for valid provider IDs.
+
+ALTER TABLE albums DROP CONSTRAINT IF EXISTS albums_cover_art_source_check;
+ALTER TABLE albums
+    ADD CONSTRAINT albums_cover_art_source_check
+    CHECK (cover_art_source IS NULL OR cover_art_source <> '');
+
+ALTER TABLE artists DROP CONSTRAINT IF EXISTS artists_artist_art_source_check;
+ALTER TABLE artists
+    ADD CONSTRAINT artists_artist_art_source_check
+    CHECK (artist_art_source IS NULL OR artist_art_source <> '');

internal/db/migrations/0031_lidarr_add_confirmed_at.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE lidarr_requests
+    DROP COLUMN lidarr_add_confirmed_at;

internal/db/migrations/0031_lidarr_add_confirmed_at.up.sql

@@ -0,0 +1,8 @@
+-- Additive: records when Lidarr accepted the add (POST artist/album)
+-- for an approved request. NULL = not yet sent/confirmed; the
+-- reconciler idempotently (re)sends the add until this is set, then
+-- watches for the import. Decouples the durable admin approval from the
+-- best-effort Lidarr call so a transient Lidarr outage no longer forces
+-- a manual re-approve.
+ALTER TABLE lidarr_requests
+    ADD COLUMN lidarr_add_confirmed_at timestamptz;

internal/db/queries/lidarr_requests.sql

@@ -93,3 +93,29 @@ SELECT EXISTS (
         OR (kind = 'album'  AND lidarr_album_mbid  = @mbid)
         OR (kind = 'track'  AND lidarr_track_mbid  = @mbid))
 );
+
+-- name: GetNonTerminalRequestForMBID :one
+-- Returns the oldest non-terminal (pending/approved/completed) request
+-- whose own-kind MBID matches @mbid, or pgx.ErrNoRows when none. Create()
+-- uses this to dedupe: a re-request for something already in flight
+-- returns the existing row instead of inserting a duplicate. MBIDs are
+-- globally unique per entity type, so the cross-column OR cannot
+-- false-match (an artist MBID never collides with an album/track MBID).
+SELECT * FROM lidarr_requests
+ WHERE status IN ('pending', 'approved', 'completed')
+   AND ((kind = 'artist' AND lidarr_artist_mbid = @mbid)
+     OR (kind = 'album'  AND lidarr_album_mbid  = @mbid)
+     OR (kind = 'track'  AND lidarr_track_mbid  = @mbid))
+ ORDER BY requested_at ASC
+ LIMIT 1;
+
+-- name: MarkLidarrRequestAddConfirmed :exec
+-- Idempotently records that Lidarr accepted the add for an approved
+-- request. The lidarr_add_confirmed_at IS NULL guard makes a redundant
+-- reconciler retry a no-op rather than bumping updated_at every tick.
+UPDATE lidarr_requests
+   SET lidarr_add_confirmed_at = now(),
+       updated_at              = now()
+ WHERE id = $1
+   AND status = 'approved'
+   AND lidarr_add_confirmed_at IS NULL;

internal/db/queries/system_mixes.sql

@@ -38,24 +38,46 @@ SELECT t.id, t.album_id, t.artist_id
 
 -- name: ListRediscoverTracks :many
 -- #420 Rediscover: tracks the user played a lot (>=5 non-skip) but
--- not in the last 6 months. Ordered by historical affection.
--- $1 user_id.
+-- has drifted away from. Tiered so a young library still gets a mix:
+--   tier 0  not played in the last 6 months (true rediscovery)
+--   tier 1  (only if tier 0 empty) not played in the last 30 days
+-- Ordered by historical affection. $1 user_id.
 WITH stats AS (
-    SELECT track_id, COUNT(*) AS c, MAX(started_at) AS last_at
-      FROM play_events
-     WHERE user_id = $1 AND was_skipped = false
-     GROUP BY track_id
+    SELECT pe.track_id, COUNT(*) AS c, MAX(pe.started_at) AS last_at
+      FROM play_events pe
+     WHERE pe.user_id = $1 AND pe.was_skipped = false
+     GROUP BY pe.track_id
+),
+deep AS (
+    SELECT t.id, t.album_id, t.artist_id, s.c, 0 AS tier
+      FROM tracks t
+      JOIN stats s ON s.track_id = t.id
+     WHERE s.c >= 5
+       AND s.last_at <= now() - interval '6 months'
+       AND NOT EXISTS (
+           SELECT 1 FROM lidarr_quarantine q
+            WHERE q.user_id = $1 AND q.track_id = t.id
+       )
+),
+shallow AS (
+    SELECT t.id, t.album_id, t.artist_id, s.c, 1 AS tier
+      FROM tracks t
+      JOIN stats s ON s.track_id = t.id
+     WHERE s.c >= 5
+       AND s.last_at <= now() - interval '30 days'
+       AND NOT EXISTS (
+           SELECT 1 FROM lidarr_quarantine q
+            WHERE q.user_id = $1 AND q.track_id = t.id
+       )
 )
-SELECT t.id, t.album_id, t.artist_id
-  FROM tracks t
-  JOIN stats s ON s.track_id = t.id
- WHERE s.c >= 5
-   AND s.last_at <= now() - interval '6 months'
-   AND NOT EXISTS (
-       SELECT 1 FROM lidarr_quarantine q
-        WHERE q.user_id = $1 AND q.track_id = t.id
-   )
- ORDER BY s.c DESC, t.id
+SELECT id, album_id, artist_id
+  FROM (
+    SELECT id, album_id, artist_id, c, tier FROM deep
+    UNION ALL
+    SELECT id, album_id, artist_id, c, tier FROM shallow
+     WHERE NOT EXISTS (SELECT 1 FROM deep)
+  ) u
+ ORDER BY tier, c DESC, id
  LIMIT 200;
 
 -- name: ListNewForYouTracks :many
@@ -87,16 +109,19 @@ SELECT t.id, t.album_id, t.artist_id
 
 -- name: ListOnThisDayTracks :many
 -- #422 On This Day: tracks the user played around this calendar date
--- (±7 day-of-year) in the past, excluding the very recent (>60 days
+-- (±10 day-of-year) in the past, excluding the very recent (>30 days
 -- ago) so it's nostalgic, not just "last week". Weighted by how much
--- they were played in those windows.
+-- they were played in those windows. Floor relaxed from 60→30 days
+-- and window ±7→±10 so it surfaces on a months-old library instead
+-- of needing a full year of history; still skips cleanly (no rows →
+-- no playlist) when there's no qualifying history yet.
 -- $1 user_id, $2 date string.
 WITH windowed AS (
     SELECT track_id, COUNT(*) AS c
       FROM play_events
      WHERE user_id = $1 AND was_skipped = false
-       AND started_at < now() - interval '60 days'
-       AND ABS(EXTRACT(DOY FROM started_at) - EXTRACT(DOY FROM now())) <= 7
+       AND started_at < now() - interval '30 days'
+       AND ABS(EXTRACT(DOY FROM started_at) - EXTRACT(DOY FROM now())) <= 10
      GROUP BY track_id
 )
 SELECT t.id, t.album_id, t.artist_id

internal/db/queries/system_playlists.sql

@@ -73,20 +73,50 @@ SELECT p.artist_id,
  LIMIT 5;
 
 -- name: PickTopPlayedTracksForUser :many
--- For-You candidate seeds. Returns the user's top-5 most-played
--- non-skipped tracks in the last 7 days; tie-break by track_id for
--- determinism. The Go-side picker (pickForYouSeedForDay) chooses one
--- of the returned rows as today's seed via userIDHash so the
--- candidate pool rotates day-to-day while staying stable within a
--- day.
-SELECT t.id
-  FROM play_events pe
-  JOIN tracks t ON t.id = pe.track_id
- WHERE pe.user_id = $1
-   AND pe.started_at > now() - INTERVAL '7 days'
-   AND pe.was_skipped = false
- GROUP BY t.id
- ORDER BY COUNT(*) DESC, t.id
+-- For-You candidate seeds, tiered so For-You never silently vanishes:
+--   tier 0  top non-skip plays in the last 30 days
+--   tier 1  (only if tier 0 empty) all-time top non-skip plays
+--   tier 2  (only if tiers 0+1 empty) liked tracks
+-- Returns up to 5 ids; tie-break by track_id for determinism. The
+-- Go-side picker (pickForYouSeedForDay) rotates one per day via
+-- userIDHash. Widened from a hard 7-day window, which made For-You
+-- disappear after a week of not listening and never recover on a
+-- self-hosted library with sparse history.
+WITH recent AS (
+    SELECT t.id, COUNT(*) AS c, 0 AS tier
+      FROM play_events pe
+      JOIN tracks t ON t.id = pe.track_id
+     WHERE pe.user_id = $1
+       AND pe.started_at > now() - INTERVAL '30 days'
+       AND pe.was_skipped = false
+     GROUP BY t.id
+),
+alltime AS (
+    SELECT t.id, COUNT(*) AS c, 1 AS tier
+      FROM play_events pe
+      JOIN tracks t ON t.id = pe.track_id
+     WHERE pe.user_id = $1
+       AND pe.was_skipped = false
+     GROUP BY t.id
+),
+liked AS (
+    SELECT gl.track_id AS id, 0::bigint AS c, 2 AS tier
+      FROM general_likes gl
+     WHERE gl.user_id = $1
+),
+chosen AS (
+    SELECT id, c, tier FROM recent
+    UNION ALL
+    SELECT id, c, tier FROM alltime
+     WHERE NOT EXISTS (SELECT 1 FROM recent)
+    UNION ALL
+    SELECT id, c, tier FROM liked
+     WHERE NOT EXISTS (SELECT 1 FROM recent)
+       AND NOT EXISTS (SELECT 1 FROM alltime)
+)
+SELECT id
+  FROM chosen
+ ORDER BY tier, c DESC, id
  LIMIT 5;
 
 -- name: PickTopPlayedTrackForArtistByUser :one

internal/db/queries/tracks.sql

@@ -19,6 +19,22 @@ ON CONFLICT (file_path) DO UPDATE SET
     updated_at = now()
 RETURNING *;
 
+-- name: ListTracksMissingMbidWithPath :many
+-- Track recording-MBID backfill: tracks with NULL mbid that still have
+-- a file to re-read. $1 caps the batch (mirrors the album backfill).
+SELECT id, file_path
+  FROM tracks
+ WHERE mbid IS NULL
+ ORDER BY id
+ LIMIT $1;
+
+-- name: SetTrackMbidIfNull :exec
+-- Heal a track's recording MBID only while still NULL — idempotent, so
+-- re-running the backfill is a no-op for already-healed rows.
+UPDATE tracks
+   SET mbid = $2, updated_at = now()
+ WHERE id = $1 AND mbid IS NULL;
+
 -- name: GetTrackByID :one
 SELECT * FROM tracks WHERE id = $1;
 

internal/dbtest/reset.go

@@ -55,6 +55,13 @@ var dataTables = []string{
 	"playlist_tracks",
 	"playlists",
 	"library_changes", // M7 #357 — must reset to keep cursor isolated per test
+	// SettingsService.reconcile() idempotently re-UpsertProviderSettings
+	// for every registered provider at boot, so truncating this is the
+	// correct per-test reset (clears test-modified enabled/api_key rows).
+	// cover_art_sources_meta is NOT truncated — boot only READS it
+	// (never recreates the singleton, seeded once by 0018); ResetDB
+	// resets its counter via UPDATE below instead.
+	"cover_art_provider_settings",
 	"tracks",
 	"albums",
 	"artists",
@@ -76,4 +83,14 @@ func ResetDB(t *testing.T, pool *pgxpool.Pool) {
 	); err != nil {
 		t.Fatalf("dbtest.ResetDB delete test users: %v", err)
 	}
+	// Reset the monotonic cover-art source-version counter to its
+	// post-migration seeded value. Truncating the row would break
+	// SettingsService boot, which reads (never recreates) this
+	// singleton; an UPDATE keeps the row while clearing cross-test
+	// version accumulation (CurrentVersion=4 want 1, key-only-bump).
+	if _, err := pool.Exec(ctx,
+		"UPDATE cover_art_sources_meta SET current_version = 1",
+	); err != nil {
+		t.Fatalf("dbtest.ResetDB reset cover-art version: %v", err)
+	}
 }

internal/library/mbidbackfill.go

@@ -167,3 +167,96 @@ func readMBIDsForFile(path string, logger *slog.Logger) (albumMBID, artistMBID s
 	}
 	return extractMBIDs(meta)
 }
+
+// BackfillTrackMBIDsResult tallies the track recording-MBID backfill.
+type BackfillTrackMBIDsResult struct {
+	Processed int // Tracks considered (mbid IS NULL).
+	Healed    int // Tracks whose recording MBID we set.
+	Skipped   int // Tracks whose file was missing / untagged / write failed.
+}
+
+// BackfillTrackMBIDs walks tracks with NULL mbid, re-reads each file's
+// tags, and persists the MusicBrainz recording MBID. This is the
+// counterpart to BackfillMBIDs (which heals album/artist MBIDs); it
+// unblocks the ListenBrainz similarity pipeline, which is gated on
+// tracks.mbid IS NOT NULL.
+//
+// Idempotent via SetTrackMbidIfNull: re-running costs the same N file
+// reads but is a no-op for already-healed rows. limit caps one call;
+// pass -1 for unbounded (caller normally batches per scan).
+func BackfillTrackMBIDs(ctx context.Context, pool *pgxpool.Pool, logger *slog.Logger,
+	limit int, progressCb func(BackfillTrackMBIDsResult)) (BackfillTrackMBIDsResult, error) {
+	q := dbq.New(pool)
+	queryLimit := int32(limit)
+	if limit < 0 {
+		queryLimit = 1<<31 - 1 // effectively unbounded
+	}
+
+	rows, err := q.ListTracksMissingMbidWithPath(ctx, queryLimit)
+	if err != nil {
+		return BackfillTrackMBIDsResult{}, fmt.Errorf("list tracks missing mbid: %w", err)
+	}
+
+	var res BackfillTrackMBIDsResult
+	for i, r := range rows {
+		if ctx.Err() != nil {
+			return res, ctx.Err()
+		}
+		res.Processed++
+
+		rec := readRecordingMBIDForFile(r.FilePath, logger)
+		if rec == "" {
+			res.Skipped++
+			if progressCb != nil {
+				progressCb(res)
+			}
+			continue
+		}
+
+		m := rec
+		if uerr := q.SetTrackMbidIfNull(ctx, dbq.SetTrackMbidIfNullParams{
+			ID: r.ID, Mbid: &m,
+		}); uerr != nil {
+			logger.Warn("track mbid backfill: set failed",
+				"track_id", r.ID, "err", uerr)
+			res.Skipped++
+			if progressCb != nil {
+				progressCb(res)
+			}
+			continue
+		}
+
+		res.Healed++
+		if (i+1)%500 == 0 {
+			logger.Info("track mbid backfill progress",
+				"processed", res.Processed, "healed", res.Healed, "skipped", res.Skipped)
+		}
+		if progressCb != nil {
+			progressCb(res)
+		}
+	}
+
+	logger.Info("track mbid backfill complete",
+		"processed", res.Processed, "healed", res.Healed, "skipped", res.Skipped)
+	return res, nil
+}
+
+// readRecordingMBIDForFile opens one audio file and returns its
+// MusicBrainz recording MBID, or "" when the file can't be opened, the
+// tag read fails, or the tag is absent. Errors are logged at Warn, not
+// propagated — one broken file must not halt the backfill.
+func readRecordingMBIDForFile(path string, logger *slog.Logger) string {
+	f, err := os.Open(path)
+	if err != nil {
+		logger.Warn("track mbid backfill: open failed", "path", path, "err", err)
+		return ""
+	}
+	defer func() { _ = f.Close() }()
+
+	meta, err := tag.ReadFrom(f)
+	if err != nil {
+		logger.Warn("track mbid backfill: tag read failed", "path", path, "err", err)
+		return ""
+	}
+	return extractRecordingMBID(meta)
+}

internal/library/mbids.go

@@ -27,6 +27,20 @@ func extractMBIDs(m tag.Metadata) (albumMBID, artistMBID string) {
 	return cleanMBID(info.Get(mbz.Album)), cleanMBID(info.Get(mbz.Artist))
 }
 
+// extractRecordingMBID reads the MusicBrainz *recording* ID — Picard's
+// musicbrainz_recordingid, surfaced by dhowden/tag as mbz.Recording
+// (tag display name "MusicBrainz Track Id"). This is the id the
+// ListenBrainz Labs similar-recordings API keys on and what tracks.mbid
+// stores.
+//
+// Deliberately NOT mbz.Track ("MusicBrainz Release Track Id"): that is
+// per-release-track, whereas similarity is per-recording. Kept separate
+// from extractMBIDs so its existing (album, artist) signature and unit
+// tests stay untouched.
+func extractRecordingMBID(m tag.Metadata) string {
+	return cleanMBID(mbz.Extract(m).Get(mbz.Recording))
+}
+
 func cleanMBID(s string) string {
 	if s == "" {
 		return ""

internal/library/scanner.go

@@ -142,6 +142,7 @@ func (s *Scanner) scanFile(ctx context.Context, q *dbq.Queries, path string, sta
 		return fmt.Errorf("tag read: %w", err)
 	}
 	albumMBID, artistMBID := extractMBIDs(meta)
+	recordingMBID := extractRecordingMBID(meta)
 
 	artistName := meta.Artist()
 	if artistName == "" {
@@ -195,6 +196,13 @@ func (s *Scanner) scanFile(ctx context.Context, q *dbq.Queries, path string, sta
 	if g := meta.Genre(); g != "" {
 		params.Genre = &g
 	}
+	// Recording MBID feeds the ListenBrainz similarity pipeline.
+	// UpsertTrack heals mbid on the file_path conflict, so a re-scan
+	// of a previously-untagged-into-DB track backfills it for free.
+	if recordingMBID != "" {
+		m := recordingMBID
+		params.Mbid = &m
+	}
 
 	track, err := q.UpsertTrack(ctx, params)
 	if err != nil {

internal/library/scanner_test.go

@@ -103,6 +103,17 @@ func TestScanner_Integration(t *testing.T) {
 		t.Errorf("artist sort = [%q, %q], want [Artist X, Artist Y]", artists[0].SortName, artists[1].SortName)
 	}
 
+	// The synthetic MP3s carry only an ID3 tag — no decodable audio —
+	// so ffprobe yields duration 0. The scanner deliberately refuses to
+	// skip zero-duration rows (it re-runs them so a later scan can
+	// backfill duration once probing works), which is orthogonal to the
+	// mtime-based incremental-skip this test covers. Simulate a
+	// normally-probed library so the skip path is actually exercised;
+	// updated_at is left untouched (still ≥ file mtime).
+	if _, err := pool.Exec(ctx, "UPDATE tracks SET duration_ms = 1000 WHERE duration_ms = 0"); err != nil {
+		t.Fatalf("seed durations: %v", err)
+	}
+
 	stats2, err := scanner.Scan(ctx, nil)
 	if err != nil {
 		t.Fatalf("second scan: %v", err)

internal/library/scanrun.go

@@ -49,9 +49,11 @@ type ArtistArtEnrichStageTallies struct {
 	Failed    int `json:"failed"`
 }
 
-// RunScanConfig assembles the knobs for the orchestrator. BackfillCap and
-// EnrichCap mirror the existing boot-time caps (5000 / coverArtBackfillCap)
-// so manual triggers don't accidentally drain the whole library.
+// RunScanConfig assembles the knobs for the orchestrator. BackfillCap is
+// the album/artist-MBID-backfill batch cap (5000); EnrichCap /
+// ArtistEnrichCap gate cover/artist-art enrichment (0 = off, <0 =
+// unbounded — #388 removed the global cover-art cap; remote providers
+// self-throttle per provider).
 type RunScanConfig struct {
 	BackfillCap     int
 	EnrichCap       int
@@ -154,6 +156,22 @@ func RunScan(
 		}
 	}
 
+	// Stage 2b: track recording-MBID backfill. Unblocks the ListenBrainz
+	// similarity pipeline (gated on tracks.mbid IS NOT NULL). Log-only
+	// progress — no scan_runs jsonb column to avoid a schema addition.
+	//
+	// Unbounded (-1), unlike the album backfill's 5000 staged cap: this
+	// is a one-time whole-library heal with no progress UI, and a cap
+	// just means tracks.mbid stays partially NULL until N future scans
+	// catch up (re-reading untagged files wastefully each pass). One
+	// uncapped pass converges; subsequent scans only re-read the
+	// remaining NULL (genuinely untagged) rows, which is cheap.
+	if cfg.BackfillCap != 0 {
+		if _, tberr := BackfillTrackMBIDs(ctx, pool, logger, -1, nil); tberr != nil {
+			captureErr("track_mbid_backfill", tberr)
+		}
+	}
+
 	// Stage 3: cover enrichment.
 	if enricher != nil && cfg.EnrichCap != 0 {
 		var lastP, lastS, lastF int

internal/lidarr/client.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -300,12 +301,29 @@ func (c *Client) AddArtist(ctx context.Context, p AddArtistParams) error {
 	}
 	resp, err := c.post(ctx, "/api/v1/artist", body)
 	if err != nil {
+		if isAlreadyExists(err) {
+			return ErrAlreadyExists
+		}
 		return err
 	}
 	_ = resp.Body.Close()
 	return nil
 }
 
+// isAlreadyExists detects Lidarr's 400 "already in your library" rejection
+// from an add endpoint. The post() helper buckets it as ErrLookupFailed
+// but embeds Lidarr's errorMessage body snippet; matching the phrase lets
+// the idempotent retry path treat a re-add as success instead of error.
+func isAlreadyExists(err error) bool {
+	if !errors.Is(err, ErrLookupFailed) {
+		return false
+	}
+	m := strings.ToLower(err.Error())
+	return strings.Contains(m, "already exists") ||
+		strings.Contains(m, "already been added") ||
+		strings.Contains(m, "already in your library")
+}
+
 // AddAlbum posts to POST /api/v1/album. Returns nil on 2xx; typed error
 // otherwise.
 func (c *Client) AddAlbum(ctx context.Context, p AddAlbumParams) error {
@@ -324,6 +342,9 @@ func (c *Client) AddAlbum(ctx context.Context, p AddAlbumParams) error {
 	}
 	resp, err := c.post(ctx, "/api/v1/album", body)
 	if err != nil {
+		if isAlreadyExists(err) {
+			return ErrAlreadyExists
+		}
 		return err
 	}
 	_ = resp.Body.Close()

internal/lidarr/errors.go

@@ -14,6 +14,12 @@ var (
 	ErrLookupFailed   = errors.New("lidarr: lookup failed") // 4xx other than 401/403
 	ErrServerError    = errors.New("lidarr: server error")  // 5xx
 	ErrInvalidPayload = errors.New("lidarr: invalid payload")
+	// ErrAlreadyExists is returned by AddArtist/AddAlbum when Lidarr
+	// rejects the add with a 400 because the artist/album is already in
+	// its library. This is the desired end state, not a failure — the
+	// idempotent retry path (reconciler re-sending an add after a partial
+	// success) treats it as confirmed rather than spinning forever.
+	ErrAlreadyExists = errors.New("lidarr: already exists")
 	// ErrNotFound is returned by LookupArtistByMBID and LookupAlbumByMBID
 	// when Lidarr returns 200 with an empty array — i.e., the MBID isn't in
 	// Lidarr's monitored set. Distinguished from network/auth errors so admin

internal/lidarrrequests/reconciler.go

@@ -2,6 +2,7 @@ package lidarrrequests
 
 import (
 	"context"
+	"fmt"
 	"log/slog"
 	"time"
 
@@ -11,16 +12,20 @@ import (
 
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/eventbus"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarr"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrconfig"
 )
 
 // Reconciler is a background worker that periodically scans approved
-// lidarr_requests and transitions them to completed when their target
-// track/album/artist has appeared in the local library (matched by MBID).
-// Errors per-row are logged at WARN and do not abort the tick.
+// lidarr_requests. For rows whose Lidarr add hasn't been confirmed it
+// (re)sends the add idempotently until it sticks; for confirmed rows it
+// transitions them to completed when their target track/album/artist has
+// appeared in the local library (matched by MBID). Errors per-row are
+// logged at WARN and do not abort the tick.
 type Reconciler struct {
 	pool      *pgxpool.Pool
 	lidarrCfg *lidarrconfig.Service
+	clientFn  func() *lidarr.Client
 	logger    *slog.Logger
 	bus       *eventbus.Bus
 	tick      time.Duration
@@ -28,12 +33,19 @@ type Reconciler struct {
 }
 
 // NewReconciler constructs a Reconciler with production defaults:
-// 5-minute tick, batch size 50. Pass nil for bus when no SSE publishing
-// is desired (tests, or environments without the event stream enabled).
-func NewReconciler(pool *pgxpool.Pool, cfg *lidarrconfig.Service, logger *slog.Logger, bus *eventbus.Bus) *Reconciler {
+// 5-minute tick, batch size 50. clientFn is the per-tick Lidarr client
+// factory (same pattern as Service) so config changes apply without a
+// restart; pass nil to disable the add-retry path. Pass nil for bus when
+// no SSE publishing is desired (tests, or environments without the event
+// stream enabled).
+func NewReconciler(pool *pgxpool.Pool, cfg *lidarrconfig.Service, clientFn func() *lidarr.Client, logger *slog.Logger, bus *eventbus.Bus) *Reconciler {
+	if clientFn == nil {
+		clientFn = func() *lidarr.Client { return nil }
+	}
 	return &Reconciler{
 		pool:      pool,
 		lidarrCfg: cfg,
+		clientFn:  clientFn,
 		logger:    logger,
 		bus:       bus,
 		tick:      5 * time.Minute,
@@ -118,7 +130,7 @@ func (r *Reconciler) tickOnce(ctx context.Context) error {
 	}
 
 	for _, row := range rows {
-		if err := r.reconcileRow(ctx, q, row); err != nil {
+		if err := r.reconcileRow(ctx, q, cfg, row); err != nil {
 			r.logger.Warn("lidarrrequests: reconciler row failed",
 				"request_id", row.ID,
 				"kind", row.Kind,
@@ -129,10 +141,23 @@ func (r *Reconciler) tickOnce(ctx context.Context) error {
 	return nil
 }
 
-// reconcileRow checks the library for a match and, if found, calls
-// CompleteLidarrRequest. It returns an error only for unexpected DB
-// failures; a no-match is not an error.
-func (r *Reconciler) reconcileRow(ctx context.Context, q *dbq.Queries, row dbq.LidarrRequest) error {
+// reconcileRow drives a request forward by one step. If Lidarr hasn't
+// confirmed the add yet it (re)sends it and returns — the import can't
+// land before Lidarr has the add, so there's nothing to match this tick.
+// Once confirmed, it checks the library for a match and, if found, calls
+// CompleteLidarrRequest. Returns an error only for unexpected failures
+// (the add retry's transient error included, so tickOnce logs WARN and
+// it's retried next tick — "Lidarr just keeps trying"); a no-match is
+// not an error.
+func (r *Reconciler) reconcileRow(ctx context.Context, q *dbq.Queries, cfg lidarrconfig.Config, row dbq.LidarrRequest) error {
+	if !row.LidarrAddConfirmedAt.Valid {
+		if err := r.ensureLidarrAdd(ctx, q, cfg, row); err != nil {
+			return err
+		}
+		// ensureLidarrAdd either confirmed the add or no-op'd (Lidarr
+		// client unavailable). Fall through to import-matching so an
+		// item already present in the library still completes this tick.
+	}
 	switch row.Kind {
 	case dbq.LidarrRequestKindArtist:
 		return r.reconcileArtist(ctx, q, row)
@@ -146,6 +171,26 @@ func (r *Reconciler) reconcileRow(ctx context.Context, q *dbq.Queries, row dbq.L
 	}
 }
 
+// ensureLidarrAdd (re)sends the Lidarr add for an approved request whose
+// add hasn't been confirmed. On success (including ErrAlreadyExists,
+// handled inside sendLidarrAdd) it stamps lidarr_add_confirmed_at so this
+// stops re-sending and the next tick moves to import-matching. A failure
+// is returned so tickOnce logs WARN and the row is retried next tick;
+// there is intentionally no failed-state or attempt cap — per product
+// decision Lidarr just keeps trying and the operator monitors Lidarr.
+func (r *Reconciler) ensureLidarrAdd(ctx context.Context, q *dbq.Queries, cfg lidarrconfig.Config, row dbq.LidarrRequest) error {
+	client := r.clientFn()
+	if client == nil {
+		// Lidarr disabled mid-flight; tickOnce already gates on
+		// cfg.Enabled, so this is just defensive — nothing to do.
+		return nil
+	}
+	if err := sendLidarrAdd(ctx, client, cfg, row); err != nil {
+		return fmt.Errorf("lidarr add retry: %w", err)
+	}
+	return q.MarkLidarrRequestAddConfirmed(ctx, row.ID)
+}
+
 func (r *Reconciler) reconcileArtist(ctx context.Context, q *dbq.Queries, row dbq.LidarrRequest) error {
 	var artistID pgtype.UUID
 	err := r.pool.QueryRow(ctx,

internal/lidarrrequests/reconciler_integration_test.go

@@ -121,7 +121,7 @@ func TestReconciler_MatchesArtistByMBID(t *testing.T) {
 		Kind: "artist", LidarrArtistMBID: artistMBID, ArtistName: "Boards of Canada",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}
@@ -158,7 +158,7 @@ func TestReconciler_MatchesAlbumByMBID(t *testing.T) {
 		LidarrAlbumMBID: albumMBID, AlbumTitle: "Test Album",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}
@@ -200,7 +200,7 @@ func TestReconciler_MatchesTrackViaAlbumMBID(t *testing.T) {
 		LidarrTrackMBID: trackMBID, TrackTitle: "Track One",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}
@@ -234,7 +234,7 @@ func TestReconciler_NoMatchLeavesPending(t *testing.T) {
 		Kind: "artist", LidarrArtistMBID: "nonexistent-mbid-xyz", ArtistName: "Ghost Artist",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}
@@ -278,7 +278,7 @@ func TestReconciler_AlreadyCompletedRowNotReprocessed(t *testing.T) {
 		t.Fatalf("CompleteLidarrRequest setup: %v", err)
 	}
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}
@@ -313,7 +313,7 @@ func TestReconciler_DisabledIsNoOp(t *testing.T) {
 		Kind: "artist", LidarrArtistMBID: artistMBID, ArtistName: "No-Op Artist",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}
@@ -345,7 +345,7 @@ func TestReconciler_RunRunsAtLeastOneTick(t *testing.T) {
 		Kind: "artist", LidarrArtistMBID: mbid, ArtistName: "Run Artist",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	rec.tick = 25 * time.Millisecond
 
 	done := make(chan struct{})
@@ -399,7 +399,7 @@ func TestReconciler_TrackKindNoTracksInAlbumYet(t *testing.T) {
 		LidarrTrackMBID: "t-mbid-not-yet", TrackTitle: "Some Track",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}
@@ -428,7 +428,7 @@ func TestReconciler_AlbumKindNoMatchInAlbumsTable(t *testing.T) {
 		LidarrAlbumMBID: "al-not-in-library", AlbumTitle: "Nope Album",
 	})
 
-	rec := NewReconciler(pool, lidarrconfig.New(pool), newTestLogger(), nil)
+	rec := NewReconciler(pool, lidarrconfig.New(pool), nil, newTestLogger(), nil)
 	if err := rec.tickOnce(ctx); err != nil {
 		t.Fatalf("tickOnce: %v", err)
 	}

internal/lidarrrequests/service.go

@@ -84,6 +84,23 @@ func (s *Service) Create(ctx context.Context, userID pgtype.UUID, p CreateParams
 		return dbq.LidarrRequest{}, err
 	}
 	q := dbq.New(s.pool)
+	// Dedup: if a non-terminal request for this MBID already exists,
+	// return it instead of inserting a duplicate. The Discover/search UI
+	// already hides requested candidates; this backstops races and direct
+	// API callers so we don't accrue duplicate request rows. Match on the
+	// new request's own-kind MBID (mirrors HasNonTerminalRequestForMBID).
+	dedupMBID := p.LidarrArtistMBID
+	switch p.Kind {
+	case "album":
+		dedupMBID = p.LidarrAlbumMBID
+	case "track":
+		dedupMBID = p.LidarrTrackMBID
+	}
+	if existing, derr := q.GetNonTerminalRequestForMBID(ctx, dedupMBID); derr == nil {
+		return existing, nil
+	} else if !errors.Is(derr, pgx.ErrNoRows) {
+		return dbq.LidarrRequest{}, fmt.Errorf("create: dedup check: %w", derr)
+	}
 	row, err := q.CreateLidarrRequest(ctx, dbq.CreateLidarrRequestParams{
 		UserID:           userID,
 		Kind:             dbq.LidarrRequestKind(p.Kind),
@@ -145,11 +162,14 @@ func (s *Service) ListForUser(ctx context.Context, userID pgtype.UUID, limit int
 	})
 }
 
-// Approve transitions a pending request to approved, snapshotting the
-// chosen quality profile + root folder, then calls Lidarr to actually
-// add the artist/album, then triggers a library scan. If Lidarr returns
-// an error, the request stays pending — the admin sees the error and
-// can retry without losing the request.
+// Approve records the admin's approval DURABLY first (snapshotting the
+// chosen quality profile + root folder), then makes a best-effort Lidarr
+// add and triggers a library scan. The add is no longer a gate: if Lidarr
+// is unreachable the request still becomes approved and the reconciler
+// idempotently (re)sends the add on each tick until it sticks (see
+// sendLidarrAdd + Reconciler.ensureLidarrAdd) — "Lidarr just keeps
+// trying" without the admin re-clicking. Pre-conditions (lidarr disabled,
+// not pending, defaults incomplete) still fail fast before any approval.
 func (s *Service) Approve(ctx context.Context, requestID pgtype.UUID, adminID pgtype.UUID, ov ApproveOverrides) (dbq.LidarrRequest, error) {
 	cfg, err := s.lidarrCfg.Get(ctx)
 	if err != nil {
@@ -182,23 +202,62 @@ func (s *Service) Approve(ctx context.Context, requestID pgtype.UUID, adminID pg
 		return dbq.LidarrRequest{}, ErrDefaultsIncomplete
 	}
 
-	// Lidarr requires a metadata profile id on POST /api/v1/artist (and
-	// on /api/v1/album when it has to create the parent artist). Prefer
-	// the operator's pinned choice from cfg; fall back to fetching the
-	// list and using the first when nothing's been saved yet (operators
-	// upgrading from before metadata-profile support landed).
+	// Record the approval durably FIRST so a Lidarr outage can't lose the
+	// admin's decision. The snapshotted qp/rf also feed the reconciler's
+	// retry, so a deferred add uses exactly what the admin approved with.
+	approved, err := dbq.New(s.pool).ApproveLidarrRequest(ctx, dbq.ApproveLidarrRequestParams{
+		ID:               requestID,
+		QualityProfileID: int32Ptr(qp),
+		RootFolderPath:   strPtr(rf),
+		DecidedBy:        adminID,
+	})
+	if err != nil {
+		return dbq.LidarrRequest{}, fmt.Errorf("approve: persist: %w", err)
+	}
+
+	// Best-effort immediate add for the common (Lidarr-up) path. Any
+	// failure is deliberately swallowed: the request is already durably
+	// approved and the reconciler retries the add on its next tick,
+	// leaving lidarr_add_confirmed_at NULL until it succeeds.
+	if addErr := sendLidarrAdd(ctx, client, cfg, approved); addErr == nil {
+		_ = dbq.New(s.pool).MarkLidarrRequestAddConfirmed(ctx, requestID)
+	}
+	s.scanFn()
+	return approved, nil
+}
+
+// sendLidarrAdd performs the idempotent Lidarr add for an approved
+// request. Used by Service.Approve (best-effort, common path) and by the
+// Reconciler (retry path). qp/rf come from the request's snapshot (set at
+// Approve time) with a config-default fallback; the metadata profile is
+// resolved from config, falling back to Lidarr's first profile for
+// operators who upgraded from before metadata-profile support. Treats
+// lidarr.ErrAlreadyExists as success — the artist/album is already in
+// Lidarr, which is exactly the desired end state.
+func sendLidarrAdd(ctx context.Context, client *lidarr.Client, cfg lidarrconfig.Config, row dbq.LidarrRequest) error {
+	qp := cfg.DefaultQualityProfileID
+	if row.QualityProfileID != nil && *row.QualityProfileID != 0 {
+		qp = int(*row.QualityProfileID)
+	}
+	rf := cfg.DefaultRootFolderPath
+	if row.RootFolderPath != nil && *row.RootFolderPath != "" {
+		rf = *row.RootFolderPath
+	}
+	if qp == 0 || rf == "" {
+		return ErrDefaultsIncomplete
+	}
 	mdProfileID := cfg.DefaultMetadataProfileID
 	if mdProfileID == 0 {
 		mdProfiles, mdErr := client.ListMetadataProfiles(ctx)
 		if mdErr != nil {
-			return dbq.LidarrRequest{}, fmt.Errorf("approve: list metadata profiles: %w", mdErr)
+			return fmt.Errorf("list metadata profiles: %w", mdErr)
 		}
 		if len(mdProfiles) == 0 {
-			return dbq.LidarrRequest{}, fmt.Errorf("approve: no metadata profiles configured in lidarr")
+			return fmt.Errorf("no metadata profiles configured in lidarr")
 		}
 		mdProfileID = mdProfiles[0].ID
 	}
-
+	var err error
 	switch row.Kind {
 	case dbq.LidarrRequestKindArtist:
 		err = client.AddArtist(ctx, lidarr.AddArtistParams{
@@ -224,22 +283,10 @@ func (s *Service) Approve(ctx context.Context, requestID pgtype.UUID, adminID pg
 			RootFolderPath:    rf,
 		})
 	}
-	if err != nil {
-		return dbq.LidarrRequest{}, fmt.Errorf("approve: lidarr add: %w", err)
+	if err != nil && !errors.Is(err, lidarr.ErrAlreadyExists) {
+		return err
 	}
-
-	approved, err := dbq.New(s.pool).ApproveLidarrRequest(ctx, dbq.ApproveLidarrRequestParams{
-		ID:               requestID,
-		QualityProfileID: int32Ptr(qp),
-		RootFolderPath:   strPtr(rf),
-		DecidedBy:        adminID,
-	})
-	if err != nil {
-		// Lidarr accepted but our DB update failed; admin should retry.
-		return dbq.LidarrRequest{}, fmt.Errorf("approve: persist: %w", err)
-	}
-	s.scanFn()
-	return approved, nil
+	return nil
 }
 
 // Reject transitions a pending request to rejected, recording notes and

internal/lidarrrequests/service_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"strings"
 	"testing"
 
 	"github.com/jackc/pgx/v5/pgtype"
@@ -236,10 +237,20 @@ func TestListForUser_OnlyOwnRows(t *testing.T) {
 func approveTestSetup(t *testing.T) (*Service, pgtype.UUID, *pgxpool.Pool, *httptest.Server) {
 	t.Helper()
 	pool := newPool(t)
-	stub := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+	stub := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
-		_, _ = w.Write([]byte(`{"id":1}`))
+		// Approve resolves metadata/quality profiles before the add;
+		// those list endpoints return JSON arrays, not the {"id":1}
+		// object the add endpoints return.
+		switch {
+		case strings.Contains(r.URL.Path, "/metadataprofile"):
+			_, _ = w.Write([]byte(`[{"id":1,"name":"Standard"}]`))
+		case strings.Contains(r.URL.Path, "/qualityprofile"):
+			_, _ = w.Write([]byte(`[{"id":7,"name":"Lossless"}]`))
+		default:
+			_, _ = w.Write([]byte(`{"id":1}`))
+		}
 	}))
 	t.Cleanup(stub.Close)
 

internal/playlists/system.go

@@ -289,6 +289,23 @@ var systemPlaylistRegistry = []systemPlaylistKind{
 	{Key: "first_listens", Singleton: true, Produce: produceFirstListens},
 }
 
+// systemForYouSourceLimits is a deeper candidate pool than the radio
+// default. On a self-hosted library without ListenBrainz similarity
+// data the lb_similar / similar_artists sources contribute nothing,
+// so the default (~130 raw, ~40 after dedup + diversity caps) can
+// never fill For-You's 100-track head/tail. The raised random/tag
+// fill keeps For-You ~100 deep regardless of LB enrichment; when LB
+// data IS present the larger lb/similar K just makes it richer.
+func systemForYouSourceLimits() recommendation.CandidateSourceLimits {
+	return recommendation.CandidateSourceLimits{
+		LBSimilar:     80,
+		SimilarArtist: 80,
+		TagOverlap:    60,
+		LikesOverlap:  40,
+		RandomFill:    150,
+	}
+}
+
 // produceForYou: today's seed from the user's top-5 played tracks
 // (rotates daily via userIDHash), similarity candidate pool, head+
 // tail composition. The base seed query failing is fatal; a
@@ -311,7 +328,7 @@ func produceForYou(
 		1, // recentlyPlayedHours — small to avoid filtering the seed's recent neighbourhood
 		zeroVec,
 		[]pgtype.UUID{forYouSeed},
-		recommendation.DefaultCandidateSourceLimits(),
+		systemForYouSourceLimits(),
 	)
 	if cerr != nil {
 		logger.Warn("system playlist: for-you candidates load failed; skipping",

internal/playlists/system_test.go

@@ -24,9 +24,16 @@ func discardLogger() *slog.Logger {
 // `InsertPlayEvent` doesn't accept was_skipped (that's set by an UPDATE).
 func seedPlayEvent(t *testing.T, pool *pgxpool.Pool, userID, trackID pgtype.UUID, startedAt time.Time, wasSkipped bool) {
 	t.Helper()
+	// play_events.session_id has a FK to play_sessions; create a parent
+	// session in the same statement (a random UUID violates the FK).
 	_, err := pool.Exec(context.Background(), `
+		WITH s AS (
+			INSERT INTO play_sessions (user_id, started_at, last_event_at)
+			VALUES ($1, $3, $3)
+			RETURNING id
+		)
 		INSERT INTO play_events (user_id, track_id, session_id, started_at, was_skipped)
-		VALUES ($1, $2, gen_random_uuid(), $3, $4)
+		SELECT $1, $2, s.id, $3, $4 FROM s
 	`, userID, trackID, startedAt, wasSkipped)
 	if err != nil {
 		t.Fatalf("seed play_event: %v", err)
@@ -38,7 +45,7 @@ func seedQuarantine(t *testing.T, pool *pgxpool.Pool, userID, trackID pgtype.UUI
 	t.Helper()
 	_, err := pool.Exec(context.Background(), `
 		INSERT INTO lidarr_quarantine (user_id, track_id, reason)
-		VALUES ($1, $2, 'test-hide')
+		VALUES ($1, $2, 'other')
 	`, userID, trackID)
 	if err != nil {
 		t.Fatalf("seed quarantine: %v", err)
@@ -105,16 +112,19 @@ func TestBuildSystemPlaylists_SufficientActivity(t *testing.T) {
 			if !r.SeedArtistID.Valid {
 				t.Errorf("songs_like_artist row should have non-NULL seed_artist_id")
 			}
-		case "discover":
-			// Discover playlist is valid — no seed_artist_id required.
+		case "discover", "deep_cuts", "rediscover", "new_for_you", "on_this_day", "first_listens":
+			// Discover + the #411 discovery mixes are all seedless —
+			// no seed_artist_id required.
 		default:
 			t.Errorf("unknown system_variant=%q", *r.SystemVariant)
 		}
 		if r.TrackCount == 0 {
 			t.Errorf("row %s: empty track_count", uuidString(r.ID))
 		}
-		if r.TrackCount > 25 {
-			t.Errorf("row %s: track_count=%d exceeds 25", uuidString(r.ID), r.TrackCount)
+		// For-You / Discover / the discovery mixes are sized to ~100
+		// (#352/#411); songs_like_artist stays at systemMixLength (25).
+		if r.TrackCount > 100 {
+			t.Errorf("row %s: track_count=%d exceeds 100", uuidString(r.ID), r.TrackCount)
 		}
 	}
 	if !hasForYou {