Merge pull request 'M9 diagnostics follow-ups: playback relabel, sort, connected fix, per-skip + track-identity' (#105) from dev into main

Numeric indices wobble across re-casts (offset +1↔0 seen during output
toggling), making "same track?" ambiguous. Enrich both the track_change
event and the heartbeat with local_track_id (TrackRef.id) and sonos_uri
(RemotePlayerState.currentTrackUri — the URL the speaker is actually
streaming), so a desync is unambiguous.

Also fixes the cast→phone stale-state pollution (#1211): sonos_* is now
zeroed unless a remote route is active, via a shared putSonos() helper —
so a just-ended cast's RemotePlayerState can't masquerade as live Sonos
data in the diagnostics.

Refs Scribe M9 (#119), tasks #1210 #1211.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K55iTxn95BtshocgdE1shW

android/app/src/main/java/com/fabledsword/minstrel/MinstrelApplication.kt

@@ -10,6 +10,8 @@ import com.fabledsword.minstrel.cache.CacheIndexer
 import com.fabledsword.minstrel.cache.mutations.MutationReplayer
 import com.fabledsword.minstrel.cache.sync.SyncController
 import com.fabledsword.minstrel.di.ApplicationScope
+import com.fabledsword.minstrel.diagnostics.DiagnosticsReporter
+import com.fabledsword.minstrel.diagnostics.DiagnosticsUploader
 import com.fabledsword.minstrel.events.EventsStream
 import com.fabledsword.minstrel.events.LiveEventsDispatcher
 import com.fabledsword.minstrel.metadata.FreshnessSweeper
@@ -155,6 +157,11 @@ class MinstrelApplication :
      */
     @Suppress("unused") @Inject lateinit var liveEventsDispatcher: LiveEventsDispatcher
 
+    // Device diagnostics (M9). The reporter gates itself on the account's
+    // debug flag; the uploader drains its buffer on a tick / recovery.
+    @Suppress("unused") @Inject lateinit var diagnosticsReporter: DiagnosticsReporter
+    @Suppress("unused") @Inject lateinit var diagnosticsUploader: DiagnosticsUploader
+
     @Inject @ApplicationScope lateinit var appScope: CoroutineScope
 
     override fun onCreate() {

android/app/src/main/java/com/fabledsword/minstrel/api/endpoints/DiagnosticsApi.kt

@@ -0,0 +1,36 @@
+package com.fabledsword.minstrel.api.endpoints
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.JsonElement
+import retrofit2.http.Body
+import retrofit2.http.POST
+
+/**
+ * Retrofit interface for device diagnostics ingest (M9). One call
+ * uploads a batch of buffered events. The server stores them only when
+ * the account's debug_mode_enabled flag is on (it returns 204 otherwise,
+ * which the uploader treats as success so it can drop the batch).
+ */
+interface DiagnosticsApi {
+    @POST("api/diagnostics")
+    suspend fun report(@Body body: DiagnosticsReportRequest)
+}
+
+@Serializable
+data class DiagnosticsReportRequest(
+    @SerialName("client_id") val clientId: String,
+    @SerialName("app_version") val appVersion: String? = null,
+    @SerialName("os_version") val osVersion: String? = null,
+    val events: List<DiagnosticEventWire>,
+)
+
+@Serializable
+data class DiagnosticEventWire(
+    val kind: String,
+    // Device-clock epoch milliseconds. The server stamps its own
+    // received_at; both are stored so a skewed device clock is visible.
+    @SerialName("occurred_at") val occurredAt: Long,
+    // Opaque structured payload carrying the event sub-type + fields.
+    val payload: JsonElement,
+)

android/app/src/main/java/com/fabledsword/minstrel/auth/AuthController.kt

@@ -1,6 +1,7 @@
 package com.fabledsword.minstrel.auth
 
 import com.fabledsword.minstrel.api.endpoints.AuthApi
+import com.fabledsword.minstrel.api.endpoints.MeApi
 import com.fabledsword.minstrel.di.ApplicationScope
 import com.fabledsword.minstrel.models.UserRef
 import com.fabledsword.minstrel.models.wire.LoginRequestBody
@@ -35,6 +36,7 @@ class AuthController @Inject constructor(
     retrofit: Retrofit,
 ) {
     private val api: AuthApi = retrofit.create()
+    private val meApi: MeApi = retrofit.create()
 
     private val currentUserState = MutableStateFlow<UserRef?>(null)
     val currentUser: StateFlow<UserRef?> = currentUserState.asStateFlow()
@@ -55,6 +57,10 @@ class AuthController @Inject constructor(
                 currentUserState.value = raw?.let { decodeUser(it) }
             }
         }
+        // Refresh from /api/me on startup so a remotely-changed account
+        // flag (e.g. admin enabling debug mode, M9) reaches the device
+        // without a re-login. Best-effort; failures keep the cached value.
+        scope.launch { refreshProfile() }
     }
 
     /**
@@ -72,9 +78,32 @@ class AuthController @Inject constructor(
         )
         currentUserState.value = user
         authStore.setUserJson(json.encodeToString(UserRef.serializer(), user))
+        // Pull the fuller /me shape (carries debug_mode_enabled) right
+        // after login so the diagnostics gate is correct without waiting
+        // for the next startup refresh.
+        scope.launch { refreshProfile() }
         return user
     }
 
+    /**
+     * Re-fetch the caller's profile from /api/me and update currentUser
+     * + persisted userJson. Carries account-level flags (debug mode)
+     * that aren't in the login response. Best-effort: a network failure
+     * leaves the cached identity untouched. No-op when signed out.
+     */
+    suspend fun refreshProfile() {
+        if (!isSignedIn) return
+        val p = runCatching { meApi.getProfile() }.getOrNull() ?: return
+        val user = UserRef(
+            id = p.id,
+            username = p.username,
+            isAdmin = p.isAdmin,
+            debugModeEnabled = p.debugModeEnabled,
+        )
+        currentUserState.value = user
+        authStore.setUserJson(json.encodeToString(UserRef.serializer(), user))
+    }
+
     /**
      * Clears the local session immediately and best-effort hits
      * `/api/auth/logout` so the server can drop its session row.

android/app/src/main/java/com/fabledsword/minstrel/auth/AuthStore.kt

@@ -59,6 +59,9 @@ class AuthStore @Inject constructor(
     private val cacheSettingsState = MutableStateFlow(CacheSettings.DEFAULT)
     val cacheSettings: StateFlow<CacheSettings> = cacheSettingsState.asStateFlow()
 
+    private val diagnosticsOptOutState = MutableStateFlow(false)
+    val diagnosticsOptOut: StateFlow<Boolean> = diagnosticsOptOutState.asStateFlow()
+
     private val json = Json { ignoreUnknownKeys = true }
 
     init {
@@ -70,6 +73,7 @@ class AuthStore @Inject constructor(
                 themeModeState.value = row?.themeMode
                 clientIdState.value = row?.clientId
                 cacheSettingsState.value = decodeCacheSettings(row?.cacheSettingsJson)
+                diagnosticsOptOutState.value = row?.diagnosticsOptOut ?: false
             }
         }
     }
@@ -112,6 +116,11 @@ class AuthStore @Inject constructor(
         scope.launch { persistCacheSettings(encoded) }
     }
 
+    fun setDiagnosticsOptOut(value: Boolean) {
+        diagnosticsOptOutState.value = value
+        scope.launch { persistDiagnosticsOptOut(value) }
+    }
+
     private suspend fun persistCookie(value: String?) {
         if (dao.get() == null) {
             dao.upsert(currentEntity().copy(sessionCookie = value))
@@ -160,6 +169,14 @@ class AuthStore @Inject constructor(
         }
     }
 
+    private suspend fun persistDiagnosticsOptOut(value: Boolean) {
+        if (dao.get() == null) {
+            dao.upsert(currentEntity().copy(diagnosticsOptOut = value))
+        } else {
+            dao.setDiagnosticsOptOut(value)
+        }
+    }
+
     private fun currentEntity(): AuthSessionEntity = AuthSessionEntity(
         id = ROW_ID,
         sessionCookie = sessionCookieState.value,
@@ -171,6 +188,7 @@ class AuthStore @Inject constructor(
             CacheSettings.serializer(),
             cacheSettingsState.value,
         ),
+        diagnosticsOptOut = diagnosticsOptOutState.value,
     )
 
     companion object {

android/app/src/main/java/com/fabledsword/minstrel/cache/db/AppDatabase.kt

@@ -16,6 +16,7 @@ import com.fabledsword.minstrel.cache.db.dao.CachedResumeStateDao
 import com.fabledsword.minstrel.cache.db.dao.CachedPlaylistTrackDao
 import com.fabledsword.minstrel.cache.db.dao.CachedQuarantineDao
 import com.fabledsword.minstrel.cache.db.dao.CachedTrackDao
+import com.fabledsword.minstrel.cache.db.dao.DiagnosticEventDao
 import com.fabledsword.minstrel.cache.db.dao.SyncMetadataDao
 import com.fabledsword.minstrel.cache.db.entities.AudioCacheIndexEntity
 import com.fabledsword.minstrel.cache.db.entities.AuthSessionEntity
@@ -30,6 +31,7 @@ import com.fabledsword.minstrel.cache.db.entities.CachedResumeStateEntity
 import com.fabledsword.minstrel.cache.db.entities.CachedPlaylistTrackEntity
 import com.fabledsword.minstrel.cache.db.entities.CachedQuarantineEntity
 import com.fabledsword.minstrel.cache.db.entities.CachedTrackEntity
+import com.fabledsword.minstrel.cache.db.entities.DiagnosticEventEntity
 import com.fabledsword.minstrel.cache.db.entities.SyncMetadataEntity
 
 /**
@@ -61,8 +63,11 @@ import com.fabledsword.minstrel.cache.db.entities.SyncMetadataEntity
         CachedHomeIndexEntity::class,
         CachedHistorySnapshotEntity::class,
         AuthSessionEntity::class,
+        DiagnosticEventEntity::class,
     ],
-    version = 6,
+    // v7: + diagnostic_events table (M9) and the diagnosticsOptOut column
+    // on auth_session. Pre-v1 destructive fallback rebuilds on mismatch.
+    version = 7,
     exportSchema = true,
 )
 @TypeConverters(MinstrelTypeConverters::class)
@@ -81,4 +86,5 @@ abstract class AppDatabase : RoomDatabase() {
     abstract fun cachedHomeIndexDao(): CachedHomeIndexDao
     abstract fun cachedHistorySnapshotDao(): CachedHistorySnapshotDao
     abstract fun authSessionDao(): AuthSessionDao
+    abstract fun diagnosticEventDao(): DiagnosticEventDao
 }

android/app/src/main/java/com/fabledsword/minstrel/cache/db/DatabaseModule.kt

@@ -10,6 +10,7 @@ import com.fabledsword.minstrel.cache.db.dao.CachedHistorySnapshotDao
 import com.fabledsword.minstrel.cache.db.dao.CachedHomeIndexDao
 import com.fabledsword.minstrel.cache.db.dao.CachedLikeDao
 import com.fabledsword.minstrel.cache.db.dao.CachedMutationDao
+import com.fabledsword.minstrel.cache.db.dao.DiagnosticEventDao
 import com.fabledsword.minstrel.cache.db.dao.CachedPlaylistDao
 import com.fabledsword.minstrel.cache.db.dao.CachedPlaylistTrackDao
 import com.fabledsword.minstrel.cache.db.dao.CachedQuarantineDao
@@ -105,5 +106,10 @@ object DatabaseModule {
     fun provideAudioCacheIndexDao(db: AppDatabase): AudioCacheIndexDao =
         db.audioCacheIndexDao()
 
+    @Provides
+    @Singleton
+    fun provideDiagnosticEventDao(db: AppDatabase): DiagnosticEventDao =
+        db.diagnosticEventDao()
+
     private const val DATABASE_NAME = "minstrel.db"
 }

android/app/src/main/java/com/fabledsword/minstrel/cache/db/dao/AuthSessionDao.kt

@@ -42,4 +42,8 @@ interface AuthSessionDao {
     /** Partial update: change only the serialized cache settings. */
     @Query("UPDATE auth_session SET cacheSettingsJson = :json WHERE id = 0")
     suspend fun setCacheSettingsJson(json: String?)
+
+    /** Partial update: change only the per-device diagnostics opt-out. */
+    @Query("UPDATE auth_session SET diagnosticsOptOut = :optOut WHERE id = 0")
+    suspend fun setDiagnosticsOptOut(optOut: Boolean)
 }

android/app/src/main/java/com/fabledsword/minstrel/cache/db/dao/DiagnosticEventDao.kt

@@ -0,0 +1,35 @@
+package com.fabledsword.minstrel.cache.db.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.fabledsword.minstrel.cache.db.entities.DiagnosticEventEntity
+
+@Dao
+interface DiagnosticEventDao {
+    @Insert
+    suspend fun insert(row: DiagnosticEventEntity): Long
+
+    /** FIFO drain order so the uploader sends oldest-first. */
+    @Query("SELECT * FROM diagnostic_events ORDER BY id ASC LIMIT :limit")
+    suspend fun takeBatch(limit: Int): List<DiagnosticEventEntity>
+
+    @Query("SELECT COUNT(*) FROM diagnostic_events")
+    suspend fun count(): Int
+
+    @Query("DELETE FROM diagnostic_events WHERE id IN (:ids)")
+    suspend fun deleteByIds(ids: List<Long>)
+
+    /**
+     * Ring-buffer trim: drop the oldest rows beyond [keep]. Called after
+     * insert so a long offline stretch can't grow the buffer unbounded.
+     */
+    @Query(
+        "DELETE FROM diagnostic_events WHERE id NOT IN " +
+            "(SELECT id FROM diagnostic_events ORDER BY id DESC LIMIT :keep)",
+    )
+    suspend fun trimToNewest(keep: Int)
+
+    @Query("DELETE FROM diagnostic_events")
+    suspend fun clear()
+}

android/app/src/main/java/com/fabledsword/minstrel/cache/db/entities/AuthSessionEntity.kt

@@ -36,4 +36,11 @@ data class AuthSessionEntity(
      * CacheSettings shape evolves.
      */
     val cacheSettingsJson: String? = null,
+    /**
+     * Per-device opt-out of diagnostics reporting (M9). When the
+     * account's debug mode is enabled by an admin, the user can still
+     * turn reporting OFF on this device (battery/privacy) — that local
+     * choice lives here. Default false = honor the account flag.
+     */
+    val diagnosticsOptOut: Boolean = false,
 )

android/app/src/main/java/com/fabledsword/minstrel/cache/db/entities/DiagnosticEventEntity.kt

@@ -0,0 +1,28 @@
+package com.fabledsword.minstrel.cache.db.entities
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+/**
+ * One buffered device-diagnostics event (M9). The DiagnosticsReporter
+ * writes rows here when the account's debug mode is on; the
+ * DiagnosticsUploader drains them to POST /api/diagnostics and deletes
+ * on success.
+ *
+ * This is a deliberate ring buffer that is NOT routed through the offline
+ * MutationQueue: diagnostics are high-volume, best-effort telemetry, and
+ * the bug we're chasing (roaming / dead-zone recovery) happens WHILE
+ * offline — so events must persist locally through the dead zone and
+ * upload on recovery, without clogging the user-data mutation replay.
+ *
+ * `occurredAtMillis` is the device-clock epoch-ms when the event happened
+ * (the server also stamps its own received_at). `payloadJson` is an
+ * opaque JSON object carrying the event sub-type + fields.
+ */
+@Entity(tableName = "diagnostic_events")
+data class DiagnosticEventEntity(
+    @PrimaryKey(autoGenerate = true) val id: Long = 0,
+    val kind: String,
+    val occurredAtMillis: Long,
+    val payloadJson: String,
+)

android/app/src/main/java/com/fabledsword/minstrel/diagnostics/DiagnosticsReporter.kt

@@ -0,0 +1,328 @@
+package com.fabledsword.minstrel.diagnostics
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.PowerManager
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.ProcessLifecycleOwner
+import com.fabledsword.minstrel.auth.AuthController
+import com.fabledsword.minstrel.auth.AuthStore
+import com.fabledsword.minstrel.cache.db.dao.DiagnosticEventDao
+import com.fabledsword.minstrel.cache.db.entities.DiagnosticEventEntity
+import com.fabledsword.minstrel.connectivity.ConnectivityObserver
+import com.fabledsword.minstrel.connectivity.NetworkStatusController
+import com.fabledsword.minstrel.di.ApplicationScope
+import com.fabledsword.minstrel.player.PlayerController
+import com.fabledsword.minstrel.player.RemotePlayerState
+import com.fabledsword.minstrel.player.output.OutputPickerController
+import com.fabledsword.minstrel.player.output.OutputRoute
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.launch
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/**
+ * On-device diagnostics collector (M9). Active only while the account's
+ * debug mode is enabled (server flag, read via AuthController.currentUser)
+ * AND the user hasn't opted out locally. When active it taps existing
+ * connectivity / player / UPnP / power seams READ-ONLY and writes a
+ * timeseries of events into the [DiagnosticEventDao] ring buffer; the
+ * [DiagnosticsUploader] drains that buffer to the server.
+ *
+ * The aim is to explain two failure classes after the fact: roaming /
+ * poor-data recovery (connectivity + server-health transitions) and
+ * locked-phone UPnP desync (power/Doze transitions correlated with the
+ * Sonos-vs-local position deltas captured in the heartbeat).
+ */
+@Suppress("TooManyFunctions") // one collector + one (un)register pair per signal; cohesive
+@Singleton
+class DiagnosticsReporter @Inject constructor(
+    @ApplicationContext private val context: Context,
+    @ApplicationScope private val scope: CoroutineScope,
+    private val dao: DiagnosticEventDao,
+    private val authController: AuthController,
+    private val authStore: AuthStore,
+    private val connectivity: ConnectivityObserver,
+    private val networkStatus: NetworkStatusController,
+    private val playerController: PlayerController,
+    private val outputPicker: OutputPickerController,
+    private val remoteState: RemotePlayerState,
+    private val json: Json,
+) {
+    @Volatile private var enabled = false
+    private var collectorJob: Job? = null
+    private var powerReceiver: BroadcastReceiver? = null
+    private var lifecycleObserver: DefaultLifecycleObserver? = null
+
+    init {
+        // Gate = account flag (currentUser.debugModeEnabled) AND not the
+        // per-device local opt-out.
+        scope.launch {
+            combine(authController.currentUser, authStore.diagnosticsOptOut) { user, optOut ->
+                (user?.debugModeEnabled == true) && !optOut
+            }.distinctUntilChanged().collect { setEnabled(it) }
+        }
+        // Periodically re-pull /me so a remote admin flip propagates
+        // without a re-login or app restart.
+        scope.launch {
+            while (true) {
+                delay(GATE_REFRESH_MS)
+                authController.refreshProfile()
+            }
+        }
+    }
+
+    private fun setEnabled(value: Boolean) {
+        if (value == enabled) return
+        enabled = value
+        if (value) start() else stop()
+    }
+
+    private fun start() {
+        registerPowerReceiver()
+        registerLifecycleObserver()
+        collectorJob = scope.launch {
+            record("lifecycle", buildJsonObject { put("event", "reporting_started") })
+            launch { collectConnectivity() }
+            launch { collectServerHealth() }
+            launch { collectUpnpDrops() }
+            launch { collectPlayerState() }
+            launch { collectTrackChanges() }
+            launch { collectRoutes() }
+            launch { heartbeatLoop() }
+        }
+    }
+
+    private fun stop() {
+        collectorJob?.cancel()
+        collectorJob = null
+        unregisterPowerReceiver()
+        unregisterLifecycleObserver()
+        // Off means off: drop any unsent buffer (honors the user OFF
+        // intent and avoids leaking data captured before disable).
+        scope.launch { runCatching { dao.clear() } }
+    }
+
+    private suspend fun collectConnectivity() {
+        connectivity.online.distinctUntilChanged().collect { online ->
+            record("connectivity", buildJsonObject {
+                put("event", "online_changed")
+                put("online", online)
+            })
+        }
+    }
+
+    private suspend fun collectServerHealth() {
+        // state is a StateFlow — already conflated/distinct, so no
+        // distinctUntilChanged (it's a deprecation warning = build error).
+        networkStatus.state.collect { s ->
+            record("connectivity", buildJsonObject {
+                put("event", "server_health")
+                put("state", s.name)
+            })
+        }
+    }
+
+    private suspend fun collectUpnpDrops() {
+        playerController.dropEvents.collect { msg ->
+            record("upnp_sync", buildJsonObject {
+                put("event", "drop")
+                put("message", msg)
+            })
+        }
+    }
+
+    private suspend fun collectPlayerState() {
+        // 'playback', not 'upnp_sync' — player state applies to every output
+        // route (phone speaker, Bluetooth, UPnP), not just casting.
+        playerController.uiState
+            .map { Triple(it.currentSource, it.isUpnpLoading, it.playbackError) }
+            .distinctUntilChanged()
+            .collect { (source, upnpLoading, err) ->
+                record("playback", buildJsonObject {
+                    put("event", "player_state")
+                    put("source", source ?: "")
+                    put("upnp_loading", upnpLoading)
+                    if (err != null) put("error", err)
+                })
+            }
+    }
+
+    // Emit a snapshot at each track/queue-index change — captures a
+    // skip-induced local↔Sonos desync at the INSTANT it happens, which the
+    // 45s heartbeat misses. Note: uiState is a conflated StateFlow, so a
+    // very rapid skip burst may coalesce intermediate indices (we still get
+    // the boundaries + the local-vs-Sonos snapshot).
+    private suspend fun collectTrackChanges() {
+        playerController.uiState
+            .map { it.queueIndex to it.currentTrack?.id }
+            .distinctUntilChanged()
+            .collect { (index, _) ->
+                val ui = playerController.uiState.value
+                val casting = outputPicker.routesState.value.current.protocol !=
+                    OutputRoute.Protocol.SYSTEM
+                record("playback", buildJsonObject {
+                    put("event", "track_change")
+                    put("local_index", index)
+                    // Track IDENTITY, not just index — indices wobble across
+                    // re-casts, so the id + Sonos URI make a desync unambiguous.
+                    put("local_track_id", ui.currentTrack?.id ?: "")
+                    put("local_pos_ms", ui.positionMs)
+                    putSonos(this, casting)
+                    put("upnp_loading", ui.isUpnpLoading)
+                    put("server_health", networkStatus.state.value.name)
+                    put("route", outputPicker.routesState.value.current.name)
+                })
+            }
+    }
+
+    private suspend fun collectRoutes() {
+        // 'playback' — route changes happen for all outputs. This only ever
+        // logs the ACTIVE route (routesState.current), so no "connected" flag.
+        outputPicker.routesState.map { it.current }.distinctUntilChanged().collect { r ->
+            record("playback", buildJsonObject {
+                put("event", "route")
+                put("id", r.id)
+                put("name", r.name)
+                put("kind", r.kind.name)
+                put("protocol", r.protocol.name)
+            })
+        }
+    }
+
+    private suspend fun heartbeatLoop() {
+        while (true) {
+            delay(HEARTBEAT_MS)
+            val ui = playerController.uiState.value
+            val route = outputPicker.routesState.value.current
+            val routeActive = route.protocol != OutputRoute.Protocol.SYSTEM
+            // Idle = nothing worth sampling. Skip to keep the buffer lean.
+            if (!ui.isPlaying && !routeActive) continue
+            record("heartbeat", buildJsonObject {
+                put("server_health", networkStatus.state.value.name)
+                put("is_playing", ui.isPlaying)
+                put("source", ui.currentSource ?: "")
+                put("local_index", ui.queueIndex)
+                put("local_track_id", ui.currentTrack?.id ?: "")
+                put("local_pos_ms", ui.positionMs)
+                put("route", route.name)
+                put("route_protocol", route.protocol.name)
+                putSonos(this, routeActive)
+                addPowerFields(this)
+            })
+        }
+    }
+
+    // --- power + lifecycle taps -------------------------------------------
+
+    private fun registerPowerReceiver() {
+        if (powerReceiver != null) return
+        val receiver = object : BroadcastReceiver() {
+            override fun onReceive(c: Context?, intent: Intent?) {
+                val action = intent?.action ?: return
+                if (!enabled) return
+                scope.launch { record("power", powerEvent(action)) }
+            }
+        }
+        val filter = IntentFilter().apply {
+            addAction(Intent.ACTION_SCREEN_ON)
+            addAction(Intent.ACTION_SCREEN_OFF)
+            addAction(PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED)
+        }
+        // System-protected broadcasts, but pass NOT_EXPORTED explicitly so
+        // the API 34+ registerReceiver flag requirement is satisfied.
+        ContextCompat.registerReceiver(
+            context, receiver, filter, ContextCompat.RECEIVER_NOT_EXPORTED,
+        )
+        powerReceiver = receiver
+    }
+
+    private fun unregisterPowerReceiver() {
+        powerReceiver?.let { runCatching { context.unregisterReceiver(it) } }
+        powerReceiver = null
+    }
+
+    private fun registerLifecycleObserver() {
+        if (lifecycleObserver != null) return
+        val obs = object : DefaultLifecycleObserver {
+            override fun onStart(owner: LifecycleOwner) = logLifecycle("app_foreground")
+            override fun onStop(owner: LifecycleOwner) = logLifecycle("app_background")
+        }
+        lifecycleObserver = obs
+        scope.launch(Dispatchers.Main) {
+            ProcessLifecycleOwner.get().lifecycle.addObserver(obs)
+        }
+    }
+
+    private fun unregisterLifecycleObserver() {
+        val obs = lifecycleObserver ?: return
+        lifecycleObserver = null
+        scope.launch(Dispatchers.Main) {
+            ProcessLifecycleOwner.get().lifecycle.removeObserver(obs)
+        }
+    }
+
+    private fun logLifecycle(event: String) {
+        if (!enabled) return
+        scope.launch { record("lifecycle", buildJsonObject { put("event", event) }) }
+    }
+
+    private fun powerEvent(action: String): JsonObject = buildJsonObject {
+        put("event", action.substringAfterLast('.'))
+        addPowerFields(this)
+    }
+
+    // Sonos/UPnP remote-vs-local desync fields. Only meaningful while a
+    // remote route is active; zeroed otherwise so a stale RemotePlayerState
+    // from a just-ended cast can't masquerade as live Sonos data (the
+    // cast→phone handoff artifact). currentTrackUri is the desync ground
+    // truth — it carries the track the speaker is actually streaming.
+    private fun putSonos(builder: kotlinx.serialization.json.JsonObjectBuilder, casting: Boolean) {
+        builder.put("sonos_track", if (casting) remoteState.trackNumber else 0)
+        builder.put("sonos_pos_ms", if (casting) remoteState.positionMs else 0)
+        builder.put("sonos_playing", casting && remoteState.isPlaying)
+        if (casting) builder.put("sonos_uri", remoteState.currentTrackUri)
+    }
+
+    private fun addPowerFields(builder: kotlinx.serialization.json.JsonObjectBuilder) {
+        val pm = context.getSystemService(Context.POWER_SERVICE) as PowerManager
+        builder.put("doze", pm.isDeviceIdleMode)
+        builder.put("screen_on", pm.isInteractive)
+        builder.put("battery_opt_ignored", pm.isIgnoringBatteryOptimizations(context.packageName))
+    }
+
+    private suspend fun record(kind: String, payload: JsonObject) {
+        runCatching {
+            val id = dao.insert(
+                DiagnosticEventEntity(
+                    kind = kind,
+                    occurredAtMillis = System.currentTimeMillis(),
+                    payloadJson = json.encodeToString(JsonObject.serializer(), payload),
+                ),
+            )
+            if (id % TRIM_INTERVAL == 0L) dao.trimToNewest(MAX_BUFFER)
+        }
+    }
+
+    private companion object {
+        const val HEARTBEAT_MS = 45_000L
+        const val GATE_REFRESH_MS = 300_000L // re-pull /me every 5 min
+        const val MAX_BUFFER = 5_000 // ring-buffer ceiling, oldest dropped
+        const val TRIM_INTERVAL = 50L // trim every N inserts, not every one
+    }
+}

android/app/src/main/java/com/fabledsword/minstrel/diagnostics/DiagnosticsUploader.kt

@@ -0,0 +1,118 @@
+package com.fabledsword.minstrel.diagnostics
+
+import android.os.Build
+import com.fabledsword.minstrel.BuildConfig
+import com.fabledsword.minstrel.api.endpoints.DiagnosticEventWire
+import com.fabledsword.minstrel.api.endpoints.DiagnosticsApi
+import com.fabledsword.minstrel.api.endpoints.DiagnosticsReportRequest
+import com.fabledsword.minstrel.auth.AuthStore
+import com.fabledsword.minstrel.cache.db.dao.DiagnosticEventDao
+import com.fabledsword.minstrel.cache.db.entities.DiagnosticEventEntity
+import com.fabledsword.minstrel.connectivity.NetworkStatusController
+import com.fabledsword.minstrel.connectivity.ServerHealth
+import com.fabledsword.minstrel.di.ApplicationScope
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.serialization.json.Json
+import retrofit2.Retrofit
+import retrofit2.create
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/**
+ * Drains the [DiagnosticEventDao] ring buffer to POST /api/diagnostics
+ * (M9). Triggers mirror [com.fabledsword.minstrel.cache.mutations.MutationReplayer]:
+ * a periodic tick, a sign-in (sessionCookie non-null), and a server-health
+ * recovery to [ServerHealth.Healthy] — so a dead-zone's buffered events
+ * upload the moment the link comes back.
+ *
+ * Deliberately NOT the MutationQueue: diagnostics are high-volume,
+ * best-effort telemetry. A failed upload just retries on the next tick;
+ * the server no-ops (204) when the account's debug flag is off, which the
+ * uploader treats as success so the buffer drains either way.
+ */
+@Singleton
+class DiagnosticsUploader @Inject constructor(
+    private val dao: DiagnosticEventDao,
+    private val authStore: AuthStore,
+    private val json: Json,
+    @ApplicationScope private val scope: CoroutineScope,
+    networkStatus: NetworkStatusController,
+    retrofit: Retrofit,
+) {
+    private val api: DiagnosticsApi = retrofit.create()
+    private val mutex = Mutex()
+
+    init {
+        scope.launch {
+            while (true) {
+                delay(UPLOAD_INTERVAL_MS)
+                drainSafe()
+            }
+        }
+        scope.launch {
+            authStore.sessionCookie.filterNotNull().distinctUntilChanged().collect { drainSafe() }
+        }
+        scope.launch {
+            networkStatus.state
+                .map { it == ServerHealth.Healthy }
+                .distinctUntilChanged()
+                .filter { it }
+                .collect { drainSafe() }
+        }
+    }
+
+    /** Coalesces concurrent triggers via tryLock — a drain in flight wins. */
+    private suspend fun drainSafe() {
+        val clientId = authStore.clientId.value
+        // Signed out / no client id yet → nothing to do. Single guard keeps
+        // the return count within the detekt gate.
+        if (authStore.sessionCookie.value.isNullOrEmpty() || clientId == null) return
+        if (!mutex.tryLock()) return
+        try {
+            drain(clientId)
+        } finally {
+            mutex.unlock()
+        }
+    }
+
+    private suspend fun drain(clientId: String) {
+        var more = true
+        while (more) {
+            val batch = runCatching { dao.takeBatch(BATCH_SIZE) }.getOrNull().orEmpty()
+            val sent = batch.isNotEmpty() && runCatching { upload(clientId, batch) }.isSuccess
+            if (sent) runCatching { dao.deleteByIds(batch.map { it.id }) }
+            // Keep going only while a full batch sent cleanly; otherwise stop
+            // (empty buffer, or a failure to retry on the next trigger).
+            more = sent && batch.size >= BATCH_SIZE
+        }
+    }
+
+    private suspend fun upload(clientId: String, batch: List<DiagnosticEventEntity>) {
+        api.report(
+            DiagnosticsReportRequest(
+                clientId = clientId,
+                appVersion = BuildConfig.VERSION_NAME,
+                osVersion = "Android ${Build.VERSION.RELEASE} (${Build.MODEL})",
+                events = batch.map { row ->
+                    DiagnosticEventWire(
+                        kind = row.kind,
+                        occurredAt = row.occurredAtMillis,
+                        payload = json.parseToJsonElement(row.payloadJson),
+                    )
+                },
+            ),
+        )
+    }
+
+    private companion object {
+        const val UPLOAD_INTERVAL_MS = 60_000L
+        const val BATCH_SIZE = 100
+    }
+}

android/app/src/main/java/com/fabledsword/minstrel/home/ui/HomeScreen.kt

@@ -95,6 +95,7 @@ import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
@@ -139,6 +140,7 @@ class HomeViewModel @Inject constructor(
     private val libraryRepository: LibraryRepository,
     private val player: com.fabledsword.minstrel.player.PlayerController,
     private val shuffleSource: com.fabledsword.minstrel.cache.ShuffleSource,
+    private val eventsStream: com.fabledsword.minstrel.events.EventsStream,
     networkStatus: com.fabledsword.minstrel.connectivity.NetworkStatusController,
 ) : ViewModel() {
 
@@ -167,6 +169,15 @@ class HomeViewModel @Inject constructor(
 
     init {
         refresh()
+        // #968: the daily 03:00 rebuild (and manual refresh) emit
+        // playlist.system_rebuilt; re-pull Home so the system-playlist tiles
+        // and You-might-like rows reflect the new snapshot without a manual
+        // reload. Mirrors the web SSE consumer.
+        viewModelScope.launch {
+            eventsStream.events
+                .filter { it.kind == "playlist.system_rebuilt" }
+                .collect { refresh() }
+        }
     }
 
     /**

android/app/src/main/java/com/fabledsword/minstrel/models/UserRef.kt

@@ -16,4 +16,11 @@ data class UserRef(
     val id: String,
     val username: String,
     val isAdmin: Boolean = false,
+    /**
+     * Account-level diagnostics opt-in (M9). NOT present in the login
+     * response (that's the narrow UserView) — populated by the /api/me
+     * refresh in AuthController so a remote admin flip reaches the
+     * device. Default false until the first refresh.
+     */
+    val debugModeEnabled: Boolean = false,
 )

android/app/src/main/java/com/fabledsword/minstrel/models/wire/MyProfileWire.kt

@@ -18,4 +18,5 @@ data class MyProfileWire(
     @SerialName("display_name") val displayName: String? = null,
     val email: String? = null,
     @SerialName("is_admin") val isAdmin: Boolean = false,
+    @SerialName("debug_mode_enabled") val debugModeEnabled: Boolean = false,
 )

android/app/src/main/java/com/fabledsword/minstrel/player/PlayerController.kt

@@ -14,6 +14,8 @@ import androidx.media3.session.MediaController
 import androidx.media3.session.SessionToken
 import com.fabledsword.minstrel.di.ApplicationScope
 import com.fabledsword.minstrel.models.TrackRef
+import com.fabledsword.minstrel.playlists.data.PlaylistsRepository
+import com.fabledsword.minstrel.playlists.data.toPlayableTrackRefs
 import com.fabledsword.minstrel.shared.resolveServerUrl
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.CoroutineScope
@@ -63,6 +65,7 @@ class PlayerController @Inject constructor(
     @ApplicationContext private val context: Context,
     @ApplicationScope private val scope: CoroutineScope,
     private val radio: RadioController,
+    private val playlists: PlaylistsRepository,
     private val playerFactory: PlayerFactory,
     private val activeUpnpHolder: com.fabledsword.minstrel.player.output.ActiveUpnpHolder,
     private val remoteState: RemotePlayerState,
@@ -111,6 +114,13 @@ class PlayerController @Inject constructor(
      */
     private var lastEvaluatedItemIndex: Int = -1
 
+    /**
+     * #968: self-heal budget — re-pulls of a stale refreshable queue since
+     * the last successful play. Capped so a still-broken refresh can't loop;
+     * reset when any track loads with real audio.
+     */
+    private var selfHealAttempts = 0
+
     /**
      * Stable queue snapshot kept in sync with the player's MediaItems —
      * the player's own getMediaItem(index) returns Media3 types; we keep
@@ -351,7 +361,12 @@ class PlayerController @Inject constructor(
         if (current == null || upnpEngaged) return
         val duration = controller.duration
         val isZeroDuration = duration <= 0L || duration == androidx.media3.common.C.TIME_UNSET
-        if (!isZeroDuration) return
+        if (!isZeroDuration) {
+            // A track loaded with real audio — clear the self-heal budget so
+            // a later stale queue can recover again.
+            selfHealAttempts = 0
+            return
+        }
         playbackErrorEventsChannel.trySend(
             PlaybackErrorEvent(
                 trackId = current.id,
@@ -367,6 +382,58 @@ class PlayerController @Inject constructor(
         }
     }
 
+    /**
+     * #968: the queue is fully unplayable (every track failed to load). If it
+     * came from a refreshable source — a system playlist (bare-variant source)
+     * or radio ("radio:<seed>") — the snapshot is probably stale (app/tab left
+     * open across the daily rebuild); re-pull it and resume instead of stopping.
+     * Bounded by [selfHealAttempts]. Album / artist / user-playlist / offline
+     * sources have nothing to refresh — stop.
+     */
+    private fun selfHealOrStop(controller: MediaController) {
+        val source = controller.currentMediaItem
+            ?.mediaMetadata?.extras?.getString(MINSTREL_SOURCE_KEY)
+        if (source == null || selfHealAttempts >= MAX_SELF_HEAL_ATTEMPTS) {
+            controller.stop()
+            return
+        }
+        when {
+            source.startsWith("radio:") -> {
+                selfHealAttempts++
+                scope.launch { selfHealRadio(source.removePrefix("radio:")) }
+            }
+            !source.contains(':') -> { // bare variant = refreshable system playlist
+                selfHealAttempts++
+                scope.launch { selfHealSystem(source) }
+            }
+            else -> controller.stop()
+        }
+    }
+
+    private suspend fun selfHealSystem(variant: String) {
+        val refs = runCatching { playlists.systemShuffle(variant).tracks.toPlayableTrackRefs() }
+            .getOrDefault(emptyList())
+        if (refs.isEmpty()) {
+            stopOnControllerThread()
+            return
+        }
+        setQueue(refs, initialIndex = 0, source = variant)
+    }
+
+    private suspend fun selfHealRadio(seedTrackId: String) {
+        val refs = runCatching { radio.seed(seedTrackId) }.getOrDefault(emptyList())
+        if (refs.isEmpty()) {
+            stopOnControllerThread()
+            return
+        }
+        setQueue(refs, initialIndex = 0, source = "radio:$seedTrackId")
+    }
+
+    private fun stopOnControllerThread() {
+        val controller = mediaController ?: return
+        runOnControllerThread(controller) { controller.stop() }
+    }
+
     // ── Internal: async connect + Listener-driven UI state sync ──────────
 
     private suspend fun connectAndObserve() {
@@ -417,6 +484,17 @@ class PlayerController @Inject constructor(
                             detail = error.message,
                         ),
                     )
+                    // A failed load leaves the player IDLE; advance past the bad
+                    // track and re-prepare so one unplayable item doesn't strand
+                    // playback (mirrors the zero_duration skip). At the end of a
+                    // fully-unplayable queue, try to self-heal a stale refreshable
+                    // source before stopping.
+                    if (controller.hasNextMediaItem()) {
+                        controller.seekToNextMediaItem()
+                        controller.prepare()
+                    } else {
+                        selfHealOrStop(controller)
+                    }
                 }
 
                 override fun onMediaItemTransition(
@@ -763,6 +841,10 @@ class PlayerController @Inject constructor(
 // they don't need this poll.
 private const val POSITION_POLL_INTERVAL_MS = 500L
 
+// #968: at most one stale-queue self-heal re-pull per exhaustion (reset on
+// the next successful play) so a still-broken refresh can't loop.
+private const val MAX_SELF_HEAL_ATTEMPTS = 1
+
 /**
  * Structured playback failure event for [PlaybackErrorReporter]. Drives
  * both the user-facing snackbar ("Couldn't play X — skipping") and the

android/app/src/main/java/com/fabledsword/minstrel/player/output/OutputPickerSheet.kt

@@ -133,7 +133,7 @@ private fun RouteRow(
                     maxLines = 2,
                     overflow = TextOverflow.Ellipsis,
                 )
-                val subtitle = route.description ?: defaultSubtitle(route)
+                val subtitle = route.description ?: defaultSubtitle(route, isSelected)
                 Text(
                     text = subtitle,
                     style = MaterialTheme.typography.bodySmall,
@@ -198,10 +198,13 @@ private fun MulticastHintRow() {
     }
 }
 
-private fun defaultSubtitle(route: OutputRoute): String = when (route.kind) {
+// isSelected (route == the active/selected route) drives the Bluetooth
+// "Connected" subtitle. RouteInfo.connectionState can't — it stays
+// DISCONNECTED for local SYSTEM routes even when they're in use.
+private fun defaultSubtitle(route: OutputRoute, isSelected: Boolean): String = when (route.kind) {
     OutputRoute.Kind.BuiltIn -> "Phone speaker"
     OutputRoute.Kind.Wired -> "Wired"
-    OutputRoute.Kind.Bluetooth -> if (route.isConnected) "Connected" else "Available"
+    OutputRoute.Kind.Bluetooth -> if (isSelected) "Connected" else "Available"
     OutputRoute.Kind.Cast -> "Cast"
     OutputRoute.Kind.Other -> "Available"
 }

android/app/src/main/java/com/fabledsword/minstrel/player/output/OutputRoute.kt

@@ -21,7 +21,6 @@ data class OutputRoute(
     val description: String?,
     val kind: Kind,
     val protocol: Protocol,
-    val isConnected: Boolean,
 ) {
     enum class Kind { BuiltIn, Wired, Bluetooth, Cast, Other }
 
@@ -43,9 +42,11 @@ data class OutputRoute(
         /**
          * Lift a MediaRouter [route] into the domain model. Kind is
          * inferred from [MediaRouter.RouteInfo.getDeviceType]; unknown
-         * device types fall through to [Kind.Other]. The
-         * `connectionState` proxy is good enough for the chip's
-         * "Connected"/"Available" subtitle.
+         * device types fall through to [Kind.Other]. "Active" is NOT an
+         * intrinsic of the route — the caller derives it by comparing to
+         * the selected route (RouteSnapshot.current), because
+         * RouteInfo.connectionState only reflects remote-route handshakes
+         * and stays DISCONNECTED for local SYSTEM routes even when in use.
          */
         fun fromRouteInfo(route: MediaRouter.RouteInfo): OutputRoute {
             val kind = when (route.deviceType) {
@@ -58,15 +59,12 @@ data class OutputRoute(
                 MediaRouter.RouteInfo.DEVICE_TYPE_SPEAKER -> Kind.Other
                 else -> Kind.Other
             }
-            val connected =
-                route.connectionState == MediaRouter.RouteInfo.CONNECTION_STATE_CONNECTED
             return OutputRoute(
                 id = route.id,
                 name = route.name,
                 description = route.description,
                 kind = kind,
                 protocol = Protocol.SYSTEM,
-                isConnected = connected,
             )
         }
 
@@ -76,10 +74,10 @@ data class OutputRoute(
          * network speakers into the same `OutputPickerController`
          * routes stream the system routes come through.
          *
-         * `isConnected = false` because UPnP devices have no
-         * MediaRouter connection-state concept — they're always
-         * "available" on the LAN, and the picker's selected-route
-         * rendering handles the "currently playing" indicator.
+         * UPnP devices have no MediaRouter connection-state concept —
+         * they're always "available" on the LAN, and the picker's
+         * selected-route rendering handles the "currently playing"
+         * indicator.
          *
          * Subtitle is `manufacturer modelName` joined by a single
          * space, falling back to "Network speaker" when both fields
@@ -96,7 +94,6 @@ data class OutputRoute(
                 description = description,
                 kind = Kind.Other,
                 protocol = Protocol.UPNP,
-                isConnected = false,
             )
         }
     }

android/app/src/main/java/com/fabledsword/minstrel/playlists/ui/PlaylistDetailScreen.kt

@@ -28,6 +28,10 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarDuration
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.SnackbarResult
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
@@ -139,6 +143,15 @@ class PlaylistDetailViewModel @Inject constructor(
     private val regeneratedChannel = Channel<String>(Channel.BUFFERED)
     val regenerated: Flow<String> = regeneratedChannel.receiveAsFlow()
 
+    /**
+     * #980: a system-playlist rebuild landed (SSE) while this screen is open —
+     * its list is now stale and the uuid has rotated. Drives a "this mix was
+     * refreshed → Refresh" snackbar rather than yanking the user; Refresh
+     * re-resolves the variant via [reloadRebuilt].
+     */
+    private val staleInternal = MutableStateFlow(false)
+    val stale: StateFlow<Boolean> = staleInternal.asStateFlow()
+
     val likedTrackIds: StateFlow<Set<String>> =
         likes.observeLikedTrackIds()
             .stateIn(
@@ -163,6 +176,12 @@ class PlaylistDetailViewModel @Inject constructor(
      * ignored — the playlists-list screen handles those.
      */
     private fun handlePlaylistEvent(event: LiveEvent) {
+        // #980: a system rebuild carries no playlist_id (it rebuilds all of the
+        // user's system mixes at once) — handle it before the per-id filter.
+        if (event.kind == "playlist.system_rebuilt") {
+            markStaleIfSystem()
+            return
+        }
         val eventPlaylistId = event.data["playlist_id"]?.jsonPrimitive?.contentOrNull
         if (eventPlaylistId != playlistId) return
         when (event.kind) {
@@ -171,6 +190,14 @@ class PlaylistDetailViewModel @Inject constructor(
         }
     }
 
+    private fun markStaleIfSystem() {
+        val playlist = (internal.value as? PlaylistDetailUiState.Success)
+            ?.detail?.playlist ?: return
+        if (playlist.systemVariant?.takeIf { playlist.refreshable } != null) {
+            staleInternal.value = true
+        }
+    }
+
     fun toggleLikeTrack(trackId: String) {
         val desired = trackId !in likedTrackIds.value
         viewModelScope.launch {
@@ -220,6 +247,30 @@ class PlaylistDetailViewModel @Inject constructor(
         }
     }
 
+    /**
+     * #980: user tapped Refresh on the stale-view snackbar. The rebuild
+     * already ran server-side (uuid rotated) — re-resolve the variant to the
+     * fresh playlist id and hand it to [regenerated] for navigate-replace.
+     * Unlike [regenerate] this does NOT trigger another rebuild.
+     */
+    fun reloadRebuilt() {
+        val playlist = (internal.value as? PlaylistDetailUiState.Success)
+            ?.detail?.playlist ?: return
+        val variant = playlist.systemVariant?.takeIf { playlist.refreshable } ?: return
+        staleInternal.value = false
+        viewModelScope.launch {
+            runCatching { repository.systemShuffle(variant).playlist.id }
+                .onSuccess { newId ->
+                    if (newId.isNotEmpty()) regeneratedChannel.trySend(newId)
+                }
+        }
+    }
+
+    /** #980: user dismissed the stale-view snackbar without refreshing. */
+    fun dismissStale() {
+        staleInternal.value = false
+    }
+
     /** Play the available tracks starting at [startTrackId] (or first available). */
     fun play(tracks: List<PlaylistTrackRef>, startTrackId: String?) {
         val refs = tracks.toPlayableTrackRefs()
@@ -261,8 +312,25 @@ fun PlaylistDetailScreen(
             }
         }
     }
+    // #980: a rebuild landed while this system-playlist screen is open. Offer a
+    // non-intrusive "refreshed → Refresh" snackbar; Refresh re-resolves the
+    // rotated uuid (via the regenerated navigate-replace flow).
+    val snackbarHostState = remember { SnackbarHostState() }
+    val stale by viewModel.stale.collectAsState()
+    LaunchedEffect(stale) {
+        if (stale) {
+            val result = snackbarHostState.showSnackbar(
+                message = "This mix was refreshed",
+                actionLabel = "Refresh",
+                duration = SnackbarDuration.Indefinite,
+            )
+            if (result == SnackbarResult.ActionPerformed) viewModel.reloadRebuilt()
+            else viewModel.dismissStale()
+        }
+    }
     Scaffold(
         modifier = Modifier.fillMaxSize(),
+        snackbarHost = { SnackbarHost(snackbarHostState) },
         topBar = {
             TopAppBar(
                 title = { Text(currentTitle(state)) },

android/app/src/main/java/com/fabledsword/minstrel/settings/ui/SettingsScreen.kt

@@ -28,6 +28,7 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.material3.SegmentedButton
 import androidx.compose.material3.SegmentedButtonDefaults
 import androidx.compose.material3.SingleChoiceSegmentedButtonRow
+import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
@@ -94,6 +95,7 @@ fun SettingsScreen(
             onPickTheme = themeVm::setThemeMode,
             onNavToRequests = { navController.navigate(Requests) },
             onNavToAdmin = { navController.navigate(Admin) },
+            onToggleDiagnostics = viewModel::setDiagnosticsOptOut,
             onSignOutClick = { showSignOutConfirm = true },
         )
     }
@@ -116,6 +118,7 @@ private fun SettingsList(
     onPickTheme: (ThemeMode) -> Unit,
     onNavToRequests: () -> Unit,
     onNavToAdmin: () -> Unit,
+    onToggleDiagnostics: (Boolean) -> Unit,
     onSignOutClick: () -> Unit,
 ) {
     Column(
@@ -148,6 +151,12 @@ private fun SettingsList(
         ProfileCard()
         PasswordCard()
         ListenBrainzCard()
+        if (state.diagnosticsEnabledByAdmin) {
+            DiagnosticsCard(
+                optOut = state.diagnosticsOptOut,
+                onToggle = onToggleDiagnostics,
+            )
+        }
         AppearanceCard(themeMode = themeMode, onPick = onPickTheme)
         StorageCard()
         AboutCard()
@@ -262,6 +271,46 @@ private fun AccountCard(username: String, isAdmin: Boolean, serverUrl: String) {
     }
 }
 
+// Shown only while an admin has enabled debug mode on this account. Lets
+// the user turn reporting OFF on this device (battery/privacy) without
+// touching the account flag. Checked = reporting on = NOT opted out.
+@Composable
+private fun DiagnosticsCard(optOut: Boolean, onToggle: (Boolean) -> Unit) {
+    ElevatedCard(modifier = Modifier.fillMaxWidth()) {
+        Column(
+            modifier = Modifier.padding(16.dp),
+            verticalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            Text(
+                text = "Diagnostics",
+                style = MaterialTheme.typography.titleMedium,
+                color = MaterialTheme.colorScheme.onSurface,
+            )
+            Row(verticalAlignment = Alignment.CenterVertically) {
+                Column(modifier = Modifier.weight(1f)) {
+                    Text(
+                        text = "Send diagnostic reports",
+                        style = MaterialTheme.typography.bodyLarge,
+                        color = MaterialTheme.colorScheme.onSurface,
+                    )
+                    Text(
+                        text = "Your admin enabled debug mode to investigate an " +
+                            "issue. This device streams connectivity and playback " +
+                            "diagnostics. Turn off any time.",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+                Spacer(Modifier.size(12.dp))
+                Switch(
+                    checked = !optOut,
+                    onCheckedChange = { checked -> onToggle(!checked) },
+                )
+            }
+        }
+    }
+}
+
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun AppearanceCard(themeMode: ThemeMode, onPick: (ThemeMode) -> Unit) {

android/app/src/main/java/com/fabledsword/minstrel/settings/ui/SettingsViewModel.kt

@@ -19,12 +19,15 @@ data class SettingsState(
     val isAdmin: Boolean = false,
     val isSigningOut: Boolean = false,
     val signedOut: Boolean = false,
+    // M9: account debug flag (admin-set) + this device's local opt-out.
+    val diagnosticsEnabledByAdmin: Boolean = false,
+    val diagnosticsOptOut: Boolean = false,
 )
 
 @HiltViewModel
 class SettingsViewModel @Inject constructor(
     private val authController: AuthController,
-    authStore: AuthStore,
+    private val authStore: AuthStore,
 ) : ViewModel() {
 
     private val transient = MutableStateFlow(TransientState())
@@ -41,19 +44,27 @@ class SettingsViewModel @Inject constructor(
             combine(
                 authStore.baseUrl,
                 authController.currentUser,
+                authStore.diagnosticsOptOut,
                 transient,
-            ) { url, user, t ->
+            ) { url, user, optOut, t ->
                 SettingsState(
                     serverUrl = url,
                     username = user?.username.orEmpty(),
                     isAdmin = user?.isAdmin == true,
                     isSigningOut = t.isSigningOut,
                     signedOut = t.signedOut,
+                    diagnosticsEnabledByAdmin = user?.debugModeEnabled == true,
+                    diagnosticsOptOut = optOut,
                 )
             }.collect { internal.value = it }
         }
     }
 
+    /** Per-device opt-out of diagnostics while the account flag is on. */
+    fun setDiagnosticsOptOut(optOut: Boolean) {
+        authStore.setDiagnosticsOptOut(optOut)
+    }
+
     fun signOut() {
         if (transient.value.isSigningOut) return
         viewModelScope.launch {

android/app/src/main/java/com/fabledsword/minstrel/shared/widgets/ServerImage.kt

@@ -1,15 +1,25 @@
 package com.fabledsword.minstrel.shared.widgets
 
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.layout.ContentScale
 import coil3.compose.AsyncImage
+import coil3.compose.AsyncImagePainter
 import com.fabledsword.minstrel.shared.resolveServerUrl
 
 /**
  * Renders a server-hosted image, resolving relative URLs centrally so
  * every cover surface loads consistently. Shows [fallback] when the URL
- * is blank or unresolvable.
+ * is blank/unresolvable, while the image is still loading, and when the
+ * load fails — so a tile is never left blank (e.g. art not yet backfilled,
+ * which the "You might like" row hits often).
  */
 @Composable
 fun ServerImage(
@@ -22,12 +32,26 @@ fun ServerImage(
     val resolved = resolveServerUrl(url)
     if (resolved == null) {
         fallback()
-    } else {
+        return
+    }
+    // Track Coil's load state so the fallback doubles as a placeholder
+    // (loading) and an error state (404 / unreachable) — not just a
+    // null-URL guard, which left present-but-failing URLs blank.
+    var state by remember(resolved) {
+        mutableStateOf<AsyncImagePainter.State>(AsyncImagePainter.State.Empty)
+    }
+    Box(modifier = modifier, contentAlignment = Alignment.Center) {
         AsyncImage(
             model = resolved,
             contentDescription = contentDescription,
-            modifier = modifier,
+            modifier = Modifier.fillMaxSize(),
             contentScale = contentScale,
+            onState = { state = it },
         )
+        if (state is AsyncImagePainter.State.Loading ||
+            state is AsyncImagePainter.State.Error
+        ) {
+            fallback()
+        }
     }
 }

cmd/minstrel/main.go

@@ -242,7 +242,12 @@ func run() error {
 	// active user's daily build at 03:00 in their stored timezone.
 	// Replaces the 24h-anchored cron loop (removed in the next commit
 	// of this arc).
-	playlistScheduler, err := playlists.NewScheduler(pool, logger.With("component", "playlist_scheduler"), cfg.Storage.DataDir)
+	playlistScheduler, err := playlists.NewScheduler(
+		pool,
+		logger.With("component", "playlist_scheduler"),
+		cfg.Storage.DataDir,
+		bus,
+	)
 	if err != nil {
 		return fmt.Errorf("init playlist scheduler: %w", err)
 	}

internal/api/admin_users.go

@@ -22,6 +22,7 @@ type adminUserView struct {
 	DisplayName         *string `json:"display_name"`
 	IsAdmin             bool    `json:"is_admin"`
 	AutoApproveRequests bool    `json:"auto_approve_requests"`
+	DebugModeEnabled    bool    `json:"debug_mode_enabled"`
 	CreatedAt           string  `json:"created_at"`
 }
 
@@ -44,6 +45,7 @@ func (h *handlers) handleAdminListUsers(w http.ResponseWriter, r *http.Request)
 			DisplayName:         row.DisplayName,
 			IsAdmin:             row.IsAdmin,
 			AutoApproveRequests: row.AutoApproveRequests,
+			DebugModeEnabled:    row.DebugModeEnabled,
 			CreatedAt:           row.CreatedAt.Time.UTC().Format(time.RFC3339),
 		}
 		out = append(out, v)
@@ -120,6 +122,7 @@ func (h *handlers) handleUpdateUserAdmin(w http.ResponseWriter, r *http.Request)
 		DisplayName:         updated.DisplayName,
 		IsAdmin:             updated.IsAdmin,
 		AutoApproveRequests: updated.AutoApproveRequests,
+		DebugModeEnabled:    updated.DebugModeEnabled,
 		CreatedAt:           updated.CreatedAt.Time.UTC().Format(time.RFC3339),
 	})
 }
@@ -189,6 +192,7 @@ func (h *handlers) handleAdminCreateUser(w http.ResponseWriter, r *http.Request)
 		DisplayName:         user.DisplayName,
 		IsAdmin:             user.IsAdmin,
 		AutoApproveRequests: user.AutoApproveRequests,
+		DebugModeEnabled:    user.DebugModeEnabled,
 		CreatedAt:           user.CreatedAt.Time.UTC().Format(time.RFC3339),
 	})
 }
@@ -329,6 +333,7 @@ func (h *handlers) handleAdminAutoApproveToggle(w http.ResponseWriter, r *http.R
 		DisplayName:         updated.DisplayName,
 		IsAdmin:             updated.IsAdmin,
 		AutoApproveRequests: updated.AutoApproveRequests,
+		DebugModeEnabled:    updated.DebugModeEnabled,
 		CreatedAt:           updated.CreatedAt.Time.UTC().Format(time.RFC3339),
 	})
 }

internal/api/api.go

@@ -135,6 +135,12 @@ func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playev
 			// load failures). Admin-only inbox; any user can report.
 			authed.Post("/playback-errors", h.handleReportPlaybackError)
 
+			// Device diagnostics ingest (M9). Any signed-in user can
+			// POST a batch, but events are only stored when the
+			// account's debug_mode_enabled flag is on (handler no-ops
+			// otherwise). Admin views live under /admin/diagnostics.
+			authed.Post("/diagnostics", h.handleReportDiagnostics)
+
 			// Self-hosted in-app update channel (#397). Auth-gated to
 			// prevent anonymous bandwidth abuse on the APK stream;
 			// /apk additionally per-user rate-limited.
@@ -181,6 +187,11 @@ func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playev
 				admin.Delete("/users/{id}", h.handleAdminDeleteUser)
 				admin.Post("/users/{id}/reset-password", h.handleAdminResetPassword)
 				admin.Put("/users/{id}/auto-approve", h.handleAdminAutoApproveToggle)
+				admin.Put("/users/{id}/debug-mode", h.handleAdminDebugModeToggle)
+
+				// Device diagnostics timeline + device overview (M9).
+				admin.Get("/diagnostics", h.handleListAdminDiagnostics)
+				admin.Get("/diagnostics/devices", h.handleListAdminDiagnosticDevices)
 
 				admin.Get("/cover-sources", h.handleListCoverSources)
 				admin.Patch("/cover-sources/{provider_id}", h.handleUpdateCoverSource)

internal/api/diagnostics.go

@@ -0,0 +1,346 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgtype"
+
+	"git.fabledsword.com/bvandeusen/minstrel/internal/apierror"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
+)
+
+// validDiagnosticKinds is the COARSE category whitelist. Mirrors the
+// CHECK constraint in migration 0036 — keep both in sync (per the
+// enum-CHECK-whitelist rule). The finer event discriminator + all
+// event-specific fields live inside each event's payload, so new event
+// variants do NOT require a new category here.
+var validDiagnosticKinds = map[string]struct{}{
+	"connectivity": {},
+	"upnp_sync":    {}, // genuinely UPnP/Sonos-specific (drops, resync)
+	"playback":     {}, // route + player-state, any output (phone/BT/UPnP)
+	"power":        {},
+	"lifecycle":    {},
+	"heartbeat":    {},
+	"http":         {},
+}
+
+// maxDiagnosticBatch caps a single ingest call. The client buffers and
+// flushes in batches of ~100; 500 leaves generous headroom while
+// bounding a misbehaving client's per-request work.
+const maxDiagnosticBatch = 500
+
+// Diagnostics list paging. Larger than the generic parsePaging caps
+// because the admin timeline is meant to be exported as a slice and
+// handed off for analysis — a heartbeat-dense window has many rows.
+const (
+	defaultDiagnosticPageSize = 500
+	maxDiagnosticPageSize     = 5000
+)
+
+// diagnosticEventIn is one event in a POST /api/diagnostics batch.
+// OccurredAt is the client device clock as epoch milliseconds (may be
+// skewed — the server also stamps received_at). Payload is opaque JSON
+// carrying the event's sub-type + fields.
+type diagnosticEventIn struct {
+	Kind       string          `json:"kind"`
+	OccurredAt int64           `json:"occurred_at"`
+	Payload    json.RawMessage `json:"payload"`
+}
+
+// reportDiagnosticsRequest is the body of POST /api/diagnostics — one
+// batch from one device.
+type reportDiagnosticsRequest struct {
+	ClientID   string              `json:"client_id"`
+	AppVersion *string             `json:"app_version,omitempty"`
+	OsVersion  *string             `json:"os_version,omitempty"`
+	Events     []diagnosticEventIn `json:"events"`
+}
+
+// handleReportDiagnostics implements POST /api/diagnostics. Any signed-in
+// user can call it, but events are only stored when the account's
+// debug_mode_enabled flag is on; otherwise the call is a 204 no-op so the
+// client can safely drop the batch (it gates locally on /api/me, this is
+// the race-safe backstop for "admin just disabled debug").
+func (h *handlers) handleReportDiagnostics(w http.ResponseWriter, r *http.Request) {
+	user, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if !user.DebugModeEnabled {
+		w.WriteHeader(http.StatusNoContent)
+		return
+	}
+	var req reportDiagnosticsRequest
+	if !decodeBody(w, r, &req) {
+		return
+	}
+	if strings.TrimSpace(req.ClientID) == "" {
+		writeErr(w, apierror.BadRequest("bad_request", "client_id required"))
+		return
+	}
+	if len(req.Events) == 0 {
+		writeJSON(w, http.StatusAccepted, map[string]int{"accepted": 0})
+		return
+	}
+	if len(req.Events) > maxDiagnosticBatch {
+		writeErr(w, apierror.BadRequest("batch_too_large", "too many events in one batch"))
+		return
+	}
+	for i := range req.Events {
+		if _, valid := validDiagnosticKinds[req.Events[i].Kind]; !valid {
+			writeErr(w, apierror.BadRequest("invalid_kind", "unknown diagnostic kind"))
+			return
+		}
+	}
+
+	err := pgx.BeginFunc(r.Context(), h.pool, func(tx pgx.Tx) error {
+		q := dbq.New(tx)
+		for i := range req.Events {
+			ev := req.Events[i]
+			payload := ev.Payload
+			if len(payload) == 0 {
+				payload = json.RawMessage("{}")
+			}
+			if _, err := q.InsertDiagnosticEvent(r.Context(), dbq.InsertDiagnosticEventParams{
+				UserID:     user.ID,
+				ClientID:   req.ClientID,
+				AppVersion: req.AppVersion,
+				OsVersion:  req.OsVersion,
+				Kind:       ev.Kind,
+				Payload:    payload,
+				OccurredAt: pgtype.Timestamptz{Time: time.UnixMilli(ev.OccurredAt).UTC(), Valid: true},
+			}); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		writeErrWithLog(w, h.logger, "diagnostics: insert batch failed", apierror.Internal(err))
+		return
+	}
+	writeJSON(w, http.StatusAccepted, map[string]int{"accepted": len(req.Events)})
+}
+
+// adminDiagnosticView is one row in the admin timeline response. Payload
+// is passed through verbatim as raw JSON so the SPA can render / export
+// the structured event without the server re-shaping it.
+type adminDiagnosticView struct {
+	ID         string          `json:"id"`
+	UserID     string          `json:"user_id"`
+	Username   string          `json:"username"`
+	ClientID   string          `json:"client_id"`
+	AppVersion *string         `json:"app_version,omitempty"`
+	OsVersion  *string         `json:"os_version,omitempty"`
+	Kind       string          `json:"kind"`
+	Payload    json.RawMessage `json:"payload"`
+	OccurredAt string          `json:"occurred_at"`
+	ReceivedAt string          `json:"received_at"`
+}
+
+// handleListAdminDiagnostics implements GET /api/admin/diagnostics with
+// optional filters user_id, client_id, kind, from, to (RFC3339 or epoch
+// millis) plus limit/offset. Newest-first; the SPA reverses for a
+// chronological timeline + export.
+func (h *handlers) handleListAdminDiagnostics(w http.ResponseWriter, r *http.Request) {
+	q := r.URL.Query()
+	params, ok := h.buildDiagnosticsFilter(w, q)
+	if !ok {
+		return
+	}
+	rows, err := dbq.New(h.pool).ListAdminDiagnostics(r.Context(), params)
+	if err != nil {
+		writeErrWithLog(w, h.logger, "admin: list diagnostics failed", apierror.Internal(err))
+		return
+	}
+	out := make([]adminDiagnosticView, 0, len(rows))
+	for _, row := range rows {
+		out = append(out, adminDiagnosticView{
+			ID:         uuidToString(row.ID),
+			UserID:     uuidToString(row.UserID),
+			Username:   row.Username,
+			ClientID:   row.ClientID,
+			AppVersion: row.AppVersion,
+			OsVersion:  row.OsVersion,
+			Kind:       row.Kind,
+			Payload:    json.RawMessage(row.Payload),
+			OccurredAt: formatTimestamp(row.OccurredAt),
+			ReceivedAt: formatTimestamp(row.ReceivedAt),
+		})
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+// buildDiagnosticsFilter parses the query string into a query param
+// struct, writing a 400 and returning ok=false on a malformed time.
+func (h *handlers) buildDiagnosticsFilter(
+	w http.ResponseWriter, q map[string][]string,
+) (dbq.ListAdminDiagnosticsParams, bool) {
+	get := func(k string) string {
+		if v, present := q[k]; present && len(v) > 0 {
+			return v[0]
+		}
+		return ""
+	}
+	limit, offset, err := parseDiagPaging(get("limit"), get("offset"))
+	if err != nil {
+		writeErr(w, apierror.BadRequest("bad_request", "invalid limit or offset"))
+		return dbq.ListAdminDiagnosticsParams{}, false
+	}
+	from, okFrom := parseDiagTime(get("from"))
+	to, okTo := parseDiagTime(get("to"))
+	if !okFrom || !okTo {
+		writeErr(w, apierror.BadRequest("bad_request", "invalid from/to timestamp"))
+		return dbq.ListAdminDiagnosticsParams{}, false
+	}
+	params := dbq.ListAdminDiagnosticsParams{
+		ClientID: optionalQuery(get("client_id")),
+		Kind:     optionalQuery(get("kind")),
+		FromTs:   from,
+		ToTs:     to,
+		Off:      int32(offset),
+		Lim:      int32(limit),
+	}
+	if uid, valid := parseUUID(get("user_id")); valid {
+		params.UserID = uid
+	}
+	return params, true
+}
+
+// adminDiagnosticDeviceView is one device in the "who is reporting"
+// overview / device filter dropdown.
+type adminDiagnosticDeviceView struct {
+	ClientID   string `json:"client_id"`
+	UserID     string `json:"user_id"`
+	Username   string `json:"username"`
+	AppVersion string `json:"app_version"`
+	OsVersion  string `json:"os_version"`
+	LastSeen   string `json:"last_seen"`
+	EventCount int64  `json:"event_count"`
+}
+
+// handleListAdminDiagnosticDevices implements GET
+// /api/admin/diagnostics/devices?user_id=. Lists distinct reporting
+// devices so the admin UI can populate its device filter.
+func (h *handlers) handleListAdminDiagnosticDevices(w http.ResponseWriter, r *http.Request) {
+	var userID pgtype.UUID
+	if uid, valid := parseUUID(r.URL.Query().Get("user_id")); valid {
+		userID = uid
+	}
+	rows, err := dbq.New(h.pool).ListDiagnosticDevices(r.Context(), userID)
+	if err != nil {
+		writeErrWithLog(w, h.logger, "admin: list diagnostic devices failed", apierror.Internal(err))
+		return
+	}
+	out := make([]adminDiagnosticDeviceView, 0, len(rows))
+	for _, row := range rows {
+		out = append(out, adminDiagnosticDeviceView{
+			ClientID:   row.ClientID,
+			UserID:     uuidToString(row.UserID),
+			Username:   row.Username,
+			AppVersion: row.AppVersion,
+			OsVersion:  row.OsVersion,
+			LastSeen:   formatTimestamp(row.LastSeen),
+			EventCount: row.EventCount,
+		})
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+// adminDebugModeReq is the body of PUT /api/admin/users/{id}/debug-mode.
+type adminDebugModeReq struct {
+	Enabled bool `json:"enabled"`
+}
+
+// handleAdminDebugModeToggle implements PUT
+// /api/admin/users/{id}/debug-mode — flip an account's diagnostics
+// opt-in remotely while a bug is live. Echoes the updated user.
+func (h *handlers) handleAdminDebugModeToggle(w http.ResponseWriter, r *http.Request) {
+	targetID, ok := requireURLUUID(w, r, "id")
+	if !ok {
+		return
+	}
+	var req adminDebugModeReq
+	if !decodeBody(w, r, &req) {
+		return
+	}
+	updated, err := dbq.New(h.pool).SetDebugMode(r.Context(), dbq.SetDebugModeParams{
+		ID:               targetID,
+		DebugModeEnabled: req.Enabled,
+	})
+	if err != nil {
+		writeErrWithLog(w, h.logger, "admin: set debug mode failed", apierror.Internal(err))
+		return
+	}
+	h.logger.Info("admin: debug mode toggled",
+		"target_user", uuidToString(targetID), "enabled", req.Enabled)
+	writeJSON(w, http.StatusOK, adminUserView{
+		ID:                  uuidToString(updated.ID),
+		Username:            updated.Username,
+		DisplayName:         updated.DisplayName,
+		IsAdmin:             updated.IsAdmin,
+		AutoApproveRequests: updated.AutoApproveRequests,
+		DebugModeEnabled:    updated.DebugModeEnabled,
+		CreatedAt:           updated.CreatedAt.Time.UTC().Format(time.RFC3339),
+	})
+}
+
+// parseDiagPaging reads limit/offset with diagnostics-specific caps.
+// Blank → defaults; out-of-range clamps; non-numeric → error.
+func parseDiagPaging(rawLimit, rawOffset string) (limit, offset int, err error) {
+	limit = defaultDiagnosticPageSize
+	if s := strings.TrimSpace(rawLimit); s != "" {
+		n, perr := strconv.Atoi(s)
+		if perr != nil {
+			return 0, 0, perr
+		}
+		if n < 1 {
+			n = 1
+		}
+		if n > maxDiagnosticPageSize {
+			n = maxDiagnosticPageSize
+		}
+		limit = n
+	}
+	if s := strings.TrimSpace(rawOffset); s != "" {
+		n, perr := strconv.Atoi(s)
+		if perr != nil {
+			return 0, 0, perr
+		}
+		if n > 0 {
+			offset = n
+		}
+	}
+	return limit, offset, nil
+}
+
+// optionalQuery returns nil for an absent/blank query value so the sqlc
+// NULL-or-equals filter treats it as "no filter."
+func optionalQuery(raw string) *string {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return nil
+	}
+	return &raw
+}
+
+// parseDiagTime accepts RFC3339 or epoch-millis. Empty = absent (NULL
+// filter, ok=true). Returns ok=false only on a non-empty unparseable value.
+func parseDiagTime(raw string) (pgtype.Timestamptz, bool) {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return pgtype.Timestamptz{}, true
+	}
+	if t, err := time.Parse(time.RFC3339, raw); err == nil {
+		return pgtype.Timestamptz{Time: t.UTC(), Valid: true}, true
+	}
+	if ms, err := strconv.ParseInt(raw, 10, 64); err == nil {
+		return pgtype.Timestamptz{Time: time.UnixMilli(ms).UTC(), Valid: true}, true
+	}
+	return pgtype.Timestamptz{}, false
+}

internal/api/events_publish.go

@@ -88,6 +88,21 @@ func (h *handlers) publishPlaylistEvent(kind string, ownerID, playlistID pgtype.
 	})
 }
 
+// publishSystemRebuilt notifies the owner's clients that their system
+// playlists (and You-might-like rows) were regenerated, so they invalidate
+// the home / system-playlist providers and a stale active queue can re-pull.
+// Mirrors the daily scheduler's event; fired here from the manual refresh.
+func (h *handlers) publishSystemRebuilt(userID pgtype.UUID) {
+	if h.eventbus == nil {
+		return
+	}
+	h.eventbus.Publish(eventbus.Event{
+		Kind:   "playlist.system_rebuilt",
+		UserID: uuidToString(userID),
+		Data:   map[string]any{},
+	})
+}
+
 // publishRequestStatusChanged broadcasts a Lidarr request status flip to
 // the request's original requester so their /requests page reflects the
 // new state without manual refresh. Admin actors (approve / reject) still

internal/api/me_profile.go

@@ -35,6 +35,10 @@ type meProfileResp struct {
 	DisplayName *string `json:"display_name"`
 	Email       *string `json:"email"`
 	IsAdmin     bool    `json:"is_admin"`
+	// DebugModeEnabled is the account's diagnostics opt-in. The client
+	// reads it here to decide whether to run the on-device diagnostics
+	// reporter (M9). Admin-set; the client also has a local OFF switch.
+	DebugModeEnabled bool `json:"debug_mode_enabled"`
 }
 
 func (h *handlers) handleUpdateMyProfile(w http.ResponseWriter, r *http.Request) {
@@ -125,5 +129,6 @@ func profileViewFromUser(u dbq.User) meProfileResp {
 		DisplayName:      u.DisplayName,
 		Email:            u.Email,
 		IsAdmin:          u.IsAdmin,
+		DebugModeEnabled: u.DebugModeEnabled,
 	}
 }

internal/api/playlists_system_shuffle.go

@@ -73,6 +73,8 @@ func (h *handlers) handleSystemPlaylistRefresh(w http.ResponseWriter, r *http.Re
 		writeErr(w, apierror.InternalMsg("build failed", err))
 		return
 	}
+	// #968: announce the rebuild so the user's other clients refresh.
+	h.publishSystemRebuilt(user.ID)
 	q := dbq.New(h.pool)
 	v := kind
 	pl, err := q.GetSystemPlaylistByVariantForUser(r.Context(),

internal/db/dbq/diagnostics.sql.go

@@ -0,0 +1,221 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.31.1
+// source: diagnostics.sql
+
+package dbq
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+const gcPruneDiagnostics = `-- name: GcPruneDiagnostics :execrows
+DELETE FROM diagnostic_events WHERE received_at < now() - INTERVAL '30 days'
+`
+
+// Retention sweep for the gc worker. Deletes diagnostic_events older
+// than 30 days by server clock (received_at) so a skewed client clock
+// can't keep rows alive. Matches the other gc lifecycle sweeps'
+// hardcoded-threshold style; diagnostics are debug telemetry, not user
+// data, and 30 days is ample to investigate a live incident after the
+// fact. Returns the affected row count for the sweep log line.
+func (q *Queries) GcPruneDiagnostics(ctx context.Context) (int64, error) {
+	result, err := q.db.Exec(ctx, gcPruneDiagnostics)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected(), nil
+}
+
+const insertDiagnosticEvent = `-- name: InsertDiagnosticEvent :one
+INSERT INTO diagnostic_events (
+    user_id, client_id, app_version, os_version, kind, payload, occurred_at
+)
+VALUES ($1, $2, $3, $4, $5, $6, $7)
+RETURNING id, received_at
+`
+
+type InsertDiagnosticEventParams struct {
+	UserID     pgtype.UUID
+	ClientID   string
+	AppVersion *string
+	OsVersion  *string
+	Kind       string
+	Payload    []byte
+	OccurredAt pgtype.Timestamptz
+}
+
+type InsertDiagnosticEventRow struct {
+	ID         pgtype.UUID
+	ReceivedAt pgtype.Timestamptz
+}
+
+// Records one client-reported diagnostic event. The writer validates the
+// `kind` category against its whitelist before this runs; the CHECK
+// constraint is the belt-and-braces guard. payload carries the finer
+// event discriminator + all event-specific fields. Returns received_at
+// so the caller can confirm ingest.
+func (q *Queries) InsertDiagnosticEvent(ctx context.Context, arg InsertDiagnosticEventParams) (InsertDiagnosticEventRow, error) {
+	row := q.db.QueryRow(ctx, insertDiagnosticEvent,
+		arg.UserID,
+		arg.ClientID,
+		arg.AppVersion,
+		arg.OsVersion,
+		arg.Kind,
+		arg.Payload,
+		arg.OccurredAt,
+	)
+	var i InsertDiagnosticEventRow
+	err := row.Scan(&i.ID, &i.ReceivedAt)
+	return i, err
+}
+
+const listAdminDiagnostics = `-- name: ListAdminDiagnostics :many
+SELECT
+    de.id          AS id,
+    de.user_id     AS user_id,
+    u.username     AS username,
+    de.client_id   AS client_id,
+    de.app_version AS app_version,
+    de.os_version  AS os_version,
+    de.kind        AS kind,
+    de.payload     AS payload,
+    de.occurred_at AS occurred_at,
+    de.received_at AS received_at
+FROM diagnostic_events de
+JOIN users u ON u.id = de.user_id
+WHERE ($1::uuid   IS NULL OR de.user_id   = $1::uuid)
+  AND ($2::text IS NULL OR de.client_id = $2::text)
+  AND ($3::text      IS NULL OR de.kind      = $3::text)
+  AND ($4::timestamptz IS NULL
+       OR de.occurred_at >= $4::timestamptz)
+  AND ($5::timestamptz IS NULL
+       OR de.occurred_at <= $5::timestamptz)
+ORDER BY de.occurred_at DESC
+LIMIT $7::int OFFSET $6::int
+`
+
+type ListAdminDiagnosticsParams struct {
+	UserID   pgtype.UUID
+	ClientID *string
+	Kind     *string
+	FromTs   pgtype.Timestamptz
+	ToTs     pgtype.Timestamptz
+	Off      int32
+	Lim      int32
+}
+
+type ListAdminDiagnosticsRow struct {
+	ID         pgtype.UUID
+	UserID     pgtype.UUID
+	Username   string
+	ClientID   string
+	AppVersion *string
+	OsVersion  *string
+	Kind       string
+	Payload    []byte
+	OccurredAt pgtype.Timestamptz
+	ReceivedAt pgtype.Timestamptz
+}
+
+// Admin timeline query. All filters are optional (NULL = no filter):
+// account (user_id), device (client_id), category (kind), and the
+// occurred_at window (from_ts/to_ts). Newest-first; the SPA reverses for
+// a chronological timeline / export. Joined with users for the username
+// so the view renders without a second round-trip.
+func (q *Queries) ListAdminDiagnostics(ctx context.Context, arg ListAdminDiagnosticsParams) ([]ListAdminDiagnosticsRow, error) {
+	rows, err := q.db.Query(ctx, listAdminDiagnostics,
+		arg.UserID,
+		arg.ClientID,
+		arg.Kind,
+		arg.FromTs,
+		arg.ToTs,
+		arg.Off,
+		arg.Lim,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ListAdminDiagnosticsRow
+	for rows.Next() {
+		var i ListAdminDiagnosticsRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.UserID,
+			&i.Username,
+			&i.ClientID,
+			&i.AppVersion,
+			&i.OsVersion,
+			&i.Kind,
+			&i.Payload,
+			&i.OccurredAt,
+			&i.ReceivedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const listDiagnosticDevices = `-- name: ListDiagnosticDevices :many
+SELECT
+    de.client_id            AS client_id,
+    de.user_id              AS user_id,
+    u.username              AS username,
+    max(de.app_version)::text        AS app_version,
+    max(de.os_version)::text         AS os_version,
+    max(de.occurred_at)::timestamptz AS last_seen,
+    count(*)                         AS event_count
+FROM diagnostic_events de
+JOIN users u ON u.id = de.user_id
+WHERE ($1::uuid IS NULL OR de.user_id = $1::uuid)
+GROUP BY de.client_id, de.user_id, u.username
+ORDER BY last_seen DESC
+`
+
+type ListDiagnosticDevicesRow struct {
+	ClientID   string
+	UserID     pgtype.UUID
+	Username   string
+	AppVersion string
+	OsVersion  string
+	LastSeen   pgtype.Timestamptz
+	EventCount int64
+}
+
+// Distinct devices that have reported, for the admin device filter +
+// "who is currently reporting" overview. Optionally scoped to one account.
+func (q *Queries) ListDiagnosticDevices(ctx context.Context, userID pgtype.UUID) ([]ListDiagnosticDevicesRow, error) {
+	rows, err := q.db.Query(ctx, listDiagnosticDevices, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ListDiagnosticDevicesRow
+	for rows.Next() {
+		var i ListDiagnosticDevicesRow
+		if err := rows.Scan(
+			&i.ClientID,
+			&i.UserID,
+			&i.Username,
+			&i.AppVersion,
+			&i.OsVersion,
+			&i.LastSeen,
+			&i.EventCount,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}

internal/db/dbq/models.go

@@ -265,6 +265,18 @@ type CoverArtSourcesMetum struct {
 	LastRegisteredProvidersHash string
 }
 
+type DiagnosticEvent struct {
+	ID         pgtype.UUID
+	UserID     pgtype.UUID
+	ClientID   string
+	AppVersion *string
+	OsVersion  *string
+	Kind       string
+	Payload    []byte
+	OccurredAt pgtype.Timestamptz
+	ReceivedAt pgtype.Timestamptz
+}
+
 type GeneralLike struct {
 	UserID  pgtype.UUID
 	TrackID pgtype.UUID
@@ -552,6 +564,7 @@ type User struct {
 	Email               *string
 	Timezone            string
 	TimezoneUpdatedAt   pgtype.Timestamptz
+	DebugModeEnabled    bool
 }
 
 type UserInvite struct {

internal/db/dbq/users.sql.go

@@ -54,7 +54,7 @@ func (q *Queries) CountUsers(ctx context.Context) (int64, error) {
 const createUser = `-- name: CreateUser :one
 INSERT INTO users (username, password_hash, api_token, is_admin, display_name)
 VALUES ($1, $2, $3, $4, $5)
-RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
 `
 
 type CreateUserParams struct {
@@ -89,6 +89,7 @@ func (q *Queries) CreateUser(ctx context.Context, arg CreateUserParams) (User, e
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
@@ -96,7 +97,7 @@ func (q *Queries) CreateUser(ctx context.Context, arg CreateUserParams) (User, e
 const createUserAdmin = `-- name: CreateUserAdmin :one
 INSERT INTO users (username, password_hash, api_token, is_admin, display_name)
 VALUES ($1, $2, $3, $4, $5)
-RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
 `
 
 type CreateUserAdminParams struct {
@@ -134,6 +135,7 @@ func (q *Queries) CreateUserAdmin(ctx context.Context, arg CreateUserAdminParams
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
@@ -145,7 +147,7 @@ VALUES (
     (SELECT NOT EXISTS (SELECT 1 FROM users)),
     $4
 )
-RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
 `
 
 type CreateUserFirstAdminRaceParams struct {
@@ -191,6 +193,7 @@ func (q *Queries) CreateUserFirstAdminRace(ctx context.Context, arg CreateUserFi
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
@@ -237,7 +240,7 @@ func (q *Queries) GetListenBrainzConfig(ctx context.Context, id pgtype.UUID) (Ge
 }
 
 const getUserByAPIToken = `-- name: GetUserByAPIToken :one
-SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at FROM users WHERE api_token = $1
+SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled FROM users WHERE api_token = $1
 `
 
 func (q *Queries) GetUserByAPIToken(ctx context.Context, apiToken string) (User, error) {
@@ -258,12 +261,13 @@ func (q *Queries) GetUserByAPIToken(ctx context.Context, apiToken string) (User,
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
 
 const getUserByEmail = `-- name: GetUserByEmail :one
-SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at FROM users WHERE lower(email) = lower($1)
+SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled FROM users WHERE lower(email) = lower($1)
 `
 
 // Used by forgot-password lookup. Lowercase comparison both sides
@@ -287,12 +291,13 @@ func (q *Queries) GetUserByEmail(ctx context.Context, lower string) (User, error
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
 
 const getUserByID = `-- name: GetUserByID :one
-SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at FROM users WHERE id = $1
+SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled FROM users WHERE id = $1
 `
 
 func (q *Queries) GetUserByID(ctx context.Context, id pgtype.UUID) (User, error) {
@@ -313,12 +318,13 @@ func (q *Queries) GetUserByID(ctx context.Context, id pgtype.UUID) (User, error)
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
 
 const getUserByUsername = `-- name: GetUserByUsername :one
-SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at FROM users WHERE username = $1
+SELECT id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled FROM users WHERE username = $1
 `
 
 func (q *Queries) GetUserByUsername(ctx context.Context, username string) (User, error) {
@@ -339,6 +345,7 @@ func (q *Queries) GetUserByUsername(ctx context.Context, username string) (User,
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
@@ -382,7 +389,8 @@ func (q *Queries) ListActiveUsersWithTimezones(ctx context.Context) ([]ListActiv
 }
 
 const listUsers = `-- name: ListUsers :many
-SELECT id, username, display_name, is_admin, auto_approve_requests, created_at
+SELECT id, username, display_name, is_admin, auto_approve_requests,
+       debug_mode_enabled, created_at
   FROM users
  ORDER BY created_at DESC
 `
@@ -393,6 +401,7 @@ type ListUsersRow struct {
 	DisplayName         *string
 	IsAdmin             bool
 	AutoApproveRequests bool
+	DebugModeEnabled    bool
 	CreatedAt           pgtype.Timestamptz
 }
 
@@ -412,6 +421,7 @@ func (q *Queries) ListUsers(ctx context.Context) ([]ListUsersRow, error) {
 			&i.DisplayName,
 			&i.IsAdmin,
 			&i.AutoApproveRequests,
+			&i.DebugModeEnabled,
 			&i.CreatedAt,
 		); err != nil {
 			return nil, err
@@ -426,7 +436,7 @@ func (q *Queries) ListUsers(ctx context.Context) ([]ListUsersRow, error) {
 
 const regenerateApiToken = `-- name: RegenerateApiToken :one
 UPDATE users SET api_token = $2 WHERE id = $1
-RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
 `
 
 type RegenerateApiTokenParams struct {
@@ -454,6 +464,7 @@ func (q *Queries) RegenerateApiToken(ctx context.Context, arg RegenerateApiToken
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
@@ -478,6 +489,44 @@ func (q *Queries) ResetUserPassword(ctx context.Context, arg ResetUserPasswordPa
 	return err
 }
 
+const setDebugMode = `-- name: SetDebugMode :one
+UPDATE users
+   SET debug_mode_enabled = $2
+ WHERE id = $1
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
+`
+
+type SetDebugModeParams struct {
+	ID               pgtype.UUID
+	DebugModeEnabled bool
+}
+
+// Toggle the per-account diagnostics/debug-reporting opt-in. Admin-driven
+// from /admin (flip remotely while a bug is live) or self-driven OFF from
+// the client. Returns the updated row so the handler can echo it.
+func (q *Queries) SetDebugMode(ctx context.Context, arg SetDebugModeParams) (User, error) {
+	row := q.db.QueryRow(ctx, setDebugMode, arg.ID, arg.DebugModeEnabled)
+	var i User
+	err := row.Scan(
+		&i.ID,
+		&i.Username,
+		&i.PasswordHash,
+		&i.ApiToken,
+		&i.IsAdmin,
+		&i.CreatedAt,
+		&i.SubsonicPassword,
+		&i.ListenbrainzToken,
+		&i.ListenbrainzEnabled,
+		&i.DisplayName,
+		&i.AutoApproveRequests,
+		&i.Email,
+		&i.Timezone,
+		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
+	)
+	return i, err
+}
+
 const setListenBrainzEnabled = `-- name: SetListenBrainzEnabled :exec
 UPDATE users
 SET listenbrainz_enabled = $2
@@ -531,7 +580,7 @@ const updateUserAdmin = `-- name: UpdateUserAdmin :one
 UPDATE users
    SET is_admin = $2
  WHERE id = $1
-RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
 `
 
 type UpdateUserAdminParams struct {
@@ -559,6 +608,7 @@ func (q *Queries) UpdateUserAdmin(ctx context.Context, arg UpdateUserAdminParams
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
@@ -567,7 +617,7 @@ const updateUserAutoApprove = `-- name: UpdateUserAutoApprove :one
 UPDATE users
    SET auto_approve_requests = $2
  WHERE id = $1
-RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
 `
 
 type UpdateUserAutoApproveParams struct {
@@ -594,6 +644,7 @@ func (q *Queries) UpdateUserAutoApprove(ctx context.Context, arg UpdateUserAutoA
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }
@@ -603,7 +654,7 @@ UPDATE users
    SET display_name = $2,
        email        = $3
  WHERE id = $1
-RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at
+RETURNING id, username, password_hash, api_token, is_admin, created_at, subsonic_password, listenbrainz_token, listenbrainz_enabled, display_name, auto_approve_requests, email, timezone, timezone_updated_at, debug_mode_enabled
 `
 
 type UpdateUserProfileParams struct {
@@ -632,6 +683,7 @@ func (q *Queries) UpdateUserProfile(ctx context.Context, arg UpdateUserProfilePa
 		&i.Email,
 		&i.Timezone,
 		&i.TimezoneUpdatedAt,
+		&i.DebugModeEnabled,
 	)
 	return i, err
 }

internal/db/migrations/0036_diagnostics.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE users DROP COLUMN IF EXISTS debug_mode_enabled;
+DROP TABLE IF EXISTS diagnostic_events;

internal/db/migrations/0036_diagnostics.up.sql

@@ -0,0 +1,54 @@
+-- Device diagnostics / debug-reporting subsystem (M9).
+--
+-- When an account has users.debug_mode_enabled = true, that account's
+-- client(s) stream a timeseries of device state here: connectivity +
+-- server-health transitions (roaming / poor-data recovery), UPnP/Sonos
+-- sync events (locked-phone desync), and power/lifecycle state (Doze /
+-- battery-optimization, the prime suspect for the desync). The admin
+-- /admin/diagnostics view filters by account + device + time window and
+-- exports the slice as JSON for offline analysis.
+--
+-- `kind` is a COARSE category gated by a CHECK whitelist; the finer
+-- event discriminator + all event-specific fields live in the `payload`
+-- jsonb. This keeps the enum small and stable so new event variants
+-- don't require a migration (per the enum-CHECK-whitelist rule, only a
+-- new *category* would). If you add a category here, mirror it in the
+-- handler whitelist in internal/api/diagnostics.go.
+--
+-- Two timestamps on purpose: occurred_at is the client device clock
+-- (when the event happened on the phone — may be skewed/wrong, e.g. in
+-- a dead zone), received_at is the server clock at ingest. Retention
+-- pruning is keyed on received_at so a bad client clock can't keep rows
+-- alive forever.
+
+CREATE TABLE diagnostic_events (
+    id          uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id     uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    client_id   text NOT NULL,
+    app_version text,
+    os_version  text,
+    kind        text NOT NULL,
+    payload     jsonb NOT NULL DEFAULT '{}'::jsonb,
+    occurred_at timestamptz NOT NULL,
+    received_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT diagnostic_events_kind_check
+        CHECK (kind IN (
+            'connectivity', 'upnp_sync', 'power', 'lifecycle',
+            'heartbeat', 'http'
+        ))
+);
+
+-- Admin reads filter by account then device, ordered newest-first.
+CREATE INDEX idx_diagnostic_events_user
+    ON diagnostic_events (user_id, occurred_at DESC);
+CREATE INDEX idx_diagnostic_events_client
+    ON diagnostic_events (client_id, occurred_at DESC);
+-- Retention pruner deletes by server-clock age.
+CREATE INDEX idx_diagnostic_events_received
+    ON diagnostic_events (received_at);
+
+-- Per-account opt-in for diagnostics reporting. Admin-set primarily
+-- (flip remotely while a bug is live); the client also exposes a local
+-- OFF switch. Default false: no account reports until explicitly enabled.
+ALTER TABLE users
+    ADD COLUMN IF NOT EXISTS debug_mode_enabled boolean NOT NULL DEFAULT false;

internal/db/migrations/0037_diagnostics_playback_kind.down.sql

@@ -0,0 +1,9 @@
+-- Drop rows using the new value first so they don't violate the restored
+-- (narrower) constraint, then revert the whitelist.
+DELETE FROM diagnostic_events WHERE kind = 'playback';
+ALTER TABLE diagnostic_events DROP CONSTRAINT diagnostic_events_kind_check;
+ALTER TABLE diagnostic_events ADD CONSTRAINT diagnostic_events_kind_check
+    CHECK (kind IN (
+        'connectivity', 'upnp_sync', 'power', 'lifecycle',
+        'heartbeat', 'http'
+    ));

internal/db/migrations/0037_diagnostics_playback_kind.up.sql

@@ -0,0 +1,19 @@
+-- Add 'playback' to the diagnostic_events kind whitelist (M9 follow-up).
+--
+-- `route` and `player_state` events fire for EVERY output route (phone
+-- speaker, Bluetooth, UPnP/Sonos), so bucketing them under 'upnp_sync'
+-- was misleading — an operator on Bluetooth earbuds saw "upnp_sync"
+-- rows. 'upnp_sync' now means genuinely UPnP/Sonos-specific signal
+-- (drops, and future resync/desync); general playback + route telemetry
+-- moves to the new 'playback' kind.
+--
+-- Per the enum-CHECK-whitelist rule, the new value lands by dropping and
+-- re-adding the constraint in the same change. Existing rows tagged
+-- 'upnp_sync' stay as-is (debug telemetry on a 30-day retention).
+
+ALTER TABLE diagnostic_events DROP CONSTRAINT diagnostic_events_kind_check;
+ALTER TABLE diagnostic_events ADD CONSTRAINT diagnostic_events_kind_check
+    CHECK (kind IN (
+        'connectivity', 'upnp_sync', 'power', 'lifecycle',
+        'heartbeat', 'http', 'playback'
+    ));

internal/db/queries/diagnostics.sql

@@ -0,0 +1,66 @@
+-- name: InsertDiagnosticEvent :one
+-- Records one client-reported diagnostic event. The writer validates the
+-- `kind` category against its whitelist before this runs; the CHECK
+-- constraint is the belt-and-braces guard. payload carries the finer
+-- event discriminator + all event-specific fields. Returns received_at
+-- so the caller can confirm ingest.
+INSERT INTO diagnostic_events (
+    user_id, client_id, app_version, os_version, kind, payload, occurred_at
+)
+VALUES ($1, $2, $3, $4, $5, $6, $7)
+RETURNING id, received_at;
+
+-- name: ListAdminDiagnostics :many
+-- Admin timeline query. All filters are optional (NULL = no filter):
+-- account (user_id), device (client_id), category (kind), and the
+-- occurred_at window (from_ts/to_ts). Newest-first; the SPA reverses for
+-- a chronological timeline / export. Joined with users for the username
+-- so the view renders without a second round-trip.
+SELECT
+    de.id          AS id,
+    de.user_id     AS user_id,
+    u.username     AS username,
+    de.client_id   AS client_id,
+    de.app_version AS app_version,
+    de.os_version  AS os_version,
+    de.kind        AS kind,
+    de.payload     AS payload,
+    de.occurred_at AS occurred_at,
+    de.received_at AS received_at
+FROM diagnostic_events de
+JOIN users u ON u.id = de.user_id
+WHERE (sqlc.narg(user_id)::uuid   IS NULL OR de.user_id   = sqlc.narg(user_id)::uuid)
+  AND (sqlc.narg(client_id)::text IS NULL OR de.client_id = sqlc.narg(client_id)::text)
+  AND (sqlc.narg(kind)::text      IS NULL OR de.kind      = sqlc.narg(kind)::text)
+  AND (sqlc.narg(from_ts)::timestamptz IS NULL
+       OR de.occurred_at >= sqlc.narg(from_ts)::timestamptz)
+  AND (sqlc.narg(to_ts)::timestamptz IS NULL
+       OR de.occurred_at <= sqlc.narg(to_ts)::timestamptz)
+ORDER BY de.occurred_at DESC
+LIMIT sqlc.arg(lim)::int OFFSET sqlc.arg(off)::int;
+
+-- name: ListDiagnosticDevices :many
+-- Distinct devices that have reported, for the admin device filter +
+-- "who is currently reporting" overview. Optionally scoped to one account.
+SELECT
+    de.client_id            AS client_id,
+    de.user_id              AS user_id,
+    u.username              AS username,
+    max(de.app_version)::text        AS app_version,
+    max(de.os_version)::text         AS os_version,
+    max(de.occurred_at)::timestamptz AS last_seen,
+    count(*)                         AS event_count
+FROM diagnostic_events de
+JOIN users u ON u.id = de.user_id
+WHERE (sqlc.narg(user_id)::uuid IS NULL OR de.user_id = sqlc.narg(user_id)::uuid)
+GROUP BY de.client_id, de.user_id, u.username
+ORDER BY last_seen DESC;
+
+-- name: GcPruneDiagnostics :execrows
+-- Retention sweep for the gc worker. Deletes diagnostic_events older
+-- than 30 days by server clock (received_at) so a skewed client clock
+-- can't keep rows alive. Matches the other gc lifecycle sweeps'
+-- hardcoded-threshold style; diagnostics are debug telemetry, not user
+-- data, and 30 days is ample to investigate a live incident after the
+-- fact. Returns the affected row count for the sweep log line.
+DELETE FROM diagnostic_events WHERE received_at < now() - INTERVAL '30 days';

internal/db/queries/users.sql

@@ -55,7 +55,8 @@ WHERE id = $1;
 
 -- name: ListUsers :many
 -- Admin user-management list. Sort newest-first.
-SELECT id, username, display_name, is_admin, auto_approve_requests, created_at
+SELECT id, username, display_name, is_admin, auto_approve_requests,
+       debug_mode_enabled, created_at
   FROM users
  ORDER BY created_at DESC;
 
@@ -115,6 +116,15 @@ UPDATE users
  WHERE id = $1
 RETURNING *;
 
+-- name: SetDebugMode :one
+-- Toggle the per-account diagnostics/debug-reporting opt-in. Admin-driven
+-- from /admin (flip remotely while a bug is live) or self-driven OFF from
+-- the client. Returns the updated row so the handler can echo it.
+UPDATE users
+   SET debug_mode_enabled = $2
+ WHERE id = $1
+RETURNING *;
+
 -- name: ChangeUserPassword :exec
 -- Self-service password change. Caller (HTTP handler) verifies the
 -- current password before calling this. Distinct from

internal/gc/worker.go

@@ -16,6 +16,7 @@
 //   - GcExpireScrobbleQueueFailedRows (#567)
 //   - GcResetStuckSystemPlaylistRuns (#574)
 //   - GcDeleteExpiredPasswordResets   (#575)
+//   - GcPruneDiagnostics              (M9 — diagnostics 30d retention)
 package gc
 
 import (
@@ -82,6 +83,7 @@ func (w *Worker) tickOnce(ctx context.Context) {
 	w.runSweep(ctx, "expire_scrobble_failed", q.GcExpireScrobbleQueueFailedRows)
 	w.runSweep(ctx, "reset_stuck_system_runs", q.GcResetStuckSystemPlaylistRuns)
 	w.runSweep(ctx, "delete_expired_password_resets", q.GcDeleteExpiredPasswordResets)
+	w.runSweep(ctx, "prune_diagnostics", q.GcPruneDiagnostics)
 }
 
 // runSweep is a small adapter so each sweep call site is a one-liner

internal/playlists/scheduler.go

@@ -28,6 +28,7 @@ import (
 	"github.com/jackc/pgx/v5/pgxpool"
 
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/eventbus"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/taste"
 )
 
@@ -47,14 +48,21 @@ type Scheduler struct {
 	pool    *pgxpool.Pool
 	logger  *slog.Logger
 	dataDir string
+	bus     *eventbus.Bus // #968: announce rebuilds so clients self-refresh
 
 	mu   sync.Mutex
 	jobs map[pgtype.UUID]uuid.UUID // user_id → gocron job id
 }
 
 // NewScheduler builds an idle scheduler. Caller must invoke Start
-// before any builds fire.
-func NewScheduler(pool *pgxpool.Pool, logger *slog.Logger, dataDir string) (*Scheduler, error) {
+// before any builds fire. bus may be nil (tests); rebuild events are
+// then skipped.
+func NewScheduler(
+	pool *pgxpool.Pool,
+	logger *slog.Logger,
+	dataDir string,
+	bus *eventbus.Bus,
+) (*Scheduler, error) {
 	g, err := gocron.NewScheduler()
 	if err != nil {
 		return nil, fmt.Errorf("init gocron: %w", err)
@@ -64,6 +72,7 @@ func NewScheduler(pool *pgxpool.Pool, logger *slog.Logger, dataDir string) (*Sch
 		pool:    pool,
 		logger:  logger,
 		dataDir: dataDir,
+		bus:     bus,
 		jobs:    map[pgtype.UUID]uuid.UUID{},
 	}, nil
 }
@@ -234,7 +243,26 @@ func (s *Scheduler) rebuildUserDaily(ctx context.Context, userID pgtype.UUID, no
 	if err := BuildSystemPlaylists(ctx, s.pool, s.logger, userID, now, s.dataDir); err != nil {
 		s.logger.Warn("scheduler: build failed",
 			"user_id", uuidStringPL(userID), "err", err)
+		return
 	}
+	// #968: tell the user's connected clients their home content was
+	// regenerated, so a tab/app left open across the rebuild refreshes its
+	// system-playlist + You-might-like views (and a stale active queue can
+	// re-pull) instead of serving yesterday's snapshot until a manual reload.
+	s.publishRebuilt(userID)
+}
+
+// publishRebuilt broadcasts a user-scoped "system playlists rebuilt" event.
+// No-op when the bus is nil (test construction).
+func (s *Scheduler) publishRebuilt(userID pgtype.UUID) {
+	if s.bus == nil {
+		return
+	}
+	s.bus.Publish(eventbus.Event{
+		Kind:   "playlist.system_rebuilt",
+		UserID: uuidStringPL(userID),
+		Data:   map[string]any{},
+	})
 }
 
 // Stop drains gocron and stops the scheduler loop.

web/src/lib/api/admin.ts

@@ -391,6 +391,7 @@ export type AdminUser = {
   display_name: string | null;
   is_admin: boolean;
   auto_approve_requests: boolean;
+  debug_mode_enabled: boolean;
   created_at: string;
 };
 
@@ -451,6 +452,12 @@ export async function updateUserAutoApprove(id: string, autoApprove: boolean): P
   return api.put<AdminUser>(`/api/admin/users/${id}/auto-approve`, { auto_approve: autoApprove });
 }
 
+// Flip an account's diagnostics/debug-reporting opt-in (M9). Admin-set;
+// the client obeys it (with a local per-device OFF switch).
+export async function updateUserDebugMode(id: string, enabled: boolean): Promise<AdminUser> {
+  return api.put<AdminUser>(`/api/admin/users/${id}/debug-mode`, { enabled });
+}
+
 export function createAdminUsersQuery() {
   return createQuery({
     queryKey: qk.adminUsers(),
@@ -497,3 +504,82 @@ export function createSMTPConfigQuery() {
     staleTime: 60_000
   });
 }
+
+// Device diagnostics (M9) ---------------------------------------------------
+
+// Coarse event category. The finer event sub-type lives inside `payload`.
+export type DiagnosticKind =
+  | 'connectivity'
+  | 'upnp_sync'
+  | 'power'
+  | 'lifecycle'
+  | 'heartbeat'
+  | 'http';
+
+export type AdminDiagnostic = {
+  id: string;
+  user_id: string;
+  username: string;
+  client_id: string;
+  app_version?: string;
+  os_version?: string;
+  kind: DiagnosticKind | string;
+  payload: Record<string, unknown>;
+  occurred_at: string;
+  received_at: string;
+};
+
+export type AdminDiagnosticDevice = {
+  client_id: string;
+  user_id: string;
+  username: string;
+  app_version: string;
+  os_version: string;
+  last_seen: string;
+  event_count: number;
+};
+
+export type DiagnosticsFilter = {
+  userId?: string;
+  clientId?: string;
+  kind?: string;
+  from?: string; // RFC3339
+  to?: string; // RFC3339
+  limit?: number;
+};
+
+export async function listAdminDiagnostics(f: DiagnosticsFilter): Promise<AdminDiagnostic[]> {
+  const params = new URLSearchParams();
+  if (f.userId) params.set('user_id', f.userId);
+  if (f.clientId) params.set('client_id', f.clientId);
+  if (f.kind) params.set('kind', f.kind);
+  if (f.from) params.set('from', f.from);
+  if (f.to) params.set('to', f.to);
+  if (f.limit !== undefined) params.set('limit', String(f.limit));
+  const qs = params.toString();
+  return api.get<AdminDiagnostic[]>(qs ? `/api/admin/diagnostics?${qs}` : '/api/admin/diagnostics');
+}
+
+export async function listDiagnosticDevices(userId?: string): Promise<AdminDiagnosticDevice[]> {
+  const qs = userId ? `?user_id=${userId}` : '';
+  return api.get<AdminDiagnosticDevice[]>(`/api/admin/diagnostics/devices${qs}`);
+}
+
+export function createAdminDiagnosticsQuery(f: DiagnosticsFilter) {
+  return createQuery({
+    queryKey: qk.adminDiagnostics(f as Record<string, string | number | undefined>),
+    queryFn: () => listAdminDiagnostics(f),
+    // The operator enables debug then watches events stream in; a short
+    // poll keeps the timeline live without manual refresh.
+    refetchInterval: 10_000,
+    staleTime: 5_000
+  });
+}
+
+export function createDiagnosticDevicesQuery(userId?: string) {
+  return createQuery({
+    queryKey: qk.adminDiagnosticDevices(userId),
+    queryFn: () => listDiagnosticDevices(userId),
+    staleTime: 15_000
+  });
+}

web/src/lib/api/queries.ts

@@ -50,6 +50,10 @@ export const qk = {
   coverProviders:         ()              => ['coverProviders'] as const,
   adminUsers:             ()              => ['adminUsers'] as const,
   adminInvites:           ()              => ['adminInvites'] as const,
+  adminDiagnostics:       (f: Record<string, string | number | undefined>) =>
+    ['adminDiagnostics', f] as const,
+  adminDiagnosticDevices: (userId?: string) =>
+    ['adminDiagnosticDevices', { userId: userId ?? 'all' }] as const,
   smtpConfig:             ()              => ['smtpConfig'] as const,
   suggestions:            (limit?: number) =>
     ['suggestions', { limit: limit ?? 12 }] as const,

web/src/lib/components/AdminTabs.svelte

@@ -9,6 +9,7 @@
     { href: '/admin/requests',        label: 'Requests'        },
     { href: '/admin/quarantine',      label: 'Quarantine'      },
     { href: '/admin/playback-errors', label: 'Playback errors' },
+    { href: '/admin/diagnostics',     label: 'Diagnostics'     },
     { href: '/admin/users',           label: 'Users'           }
   ];
 

web/src/lib/components/AdminTabs.test.ts

@@ -52,7 +52,7 @@ describe('AdminTabs', () => {
     );
   });
 
-  test('renders all six tabs in order', () => {
+  test('renders all seven tabs in order', () => {
     state.pageUrl = new URL('http://localhost/admin');
     render(AdminTabs);
     const links = screen.getAllByRole('link');
@@ -62,6 +62,7 @@ describe('AdminTabs', () => {
       'Requests',
       'Quarantine',
       'Playback errors',
+      'Diagnostics',
       'Users'
     ]);
   });

web/src/lib/components/AlbumCard.svelte

@@ -1,18 +1,14 @@
 <script lang="ts">
   import type { AlbumRef, AlbumDetail } from '$lib/api/types';
-  import { FALLBACK_COVER } from '$lib/media/covers';
   import { api } from '$lib/api/client';
   import { enqueueTracks, playQueue } from '$lib/player/store.svelte';
   import { Play } from 'lucide-svelte';
   import AlbumMenu from './AlbumMenu.svelte';
   import CardActionCluster from './CardActionCluster.svelte';
+  import Cover from './Cover.svelte';
 
   let { album }: { album: AlbumRef } = $props();
 
-  function onImgError(e: Event) {
-    (e.currentTarget as HTMLImageElement).src = FALLBACK_COVER;
-  }
-
   async function onAddClick(e: MouseEvent) {
     e.preventDefault();
     e.stopPropagation();
@@ -38,12 +34,9 @@
              shadow-sm transition-all duration-150
              group-hover:shadow-lg group-hover:ring-1 group-hover:ring-accent/40"
     >
-      <img
+      <Cover
         src={album.cover_url}
-        alt=""
-        class="h-full w-full object-cover transition-transform group-hover:scale-[1.03]"
-        loading="lazy"
-        onerror={onImgError}
+        class="transition-transform group-hover:scale-[1.03]"
       />
       <button
         type="button"

web/src/lib/components/ArtistCard.svelte

@@ -2,9 +2,10 @@
   import type { ArtistRef, TrackRef } from '$lib/api/types';
   import { api } from '$lib/api/client';
   import { playQueue, enqueueTracks } from '$lib/player/store.svelte';
-  import { Disc3, Play } from 'lucide-svelte';
+  import { Play } from 'lucide-svelte';
   import ArtistMenu from './ArtistMenu.svelte';
   import CardActionCluster from './CardActionCluster.svelte';
+  import Cover from './Cover.svelte';
   import { listArtistTracks } from '$lib/api/artists';
 
   let { artist }: { artist: ArtistRef } = $props();
@@ -48,18 +49,12 @@
     class="block rounded focus-visible:ring-2 focus-visible:ring-accent"
   >
     <div class="art-wrap relative mx-auto aspect-square w-full overflow-hidden rounded-full bg-surface-hover">
-      {#if artist.cover_url}
-        <img
+      <Cover
         src={artist.cover_url}
-          alt=""
-          class="h-full w-full object-cover transition-transform group-hover:scale-[1.03]"
-          loading="lazy"
+        shape="round"
+        fallback="artist"
+        class="transition-transform group-hover:scale-[1.03]"
       />
-      {:else}
-        <div class="flex h-full w-full items-center justify-center">
-          <Disc3 strokeWidth={1} class="h-4/5 w-4/5 text-text-muted" />
-        </div>
-      {/if}
       <button
         type="button"
         aria-label={`Play ${artist.name}`}

web/src/lib/components/CompactTrackCard.svelte

@@ -2,9 +2,10 @@
   import { Plus } from 'lucide-svelte';
   import type { TrackRef } from '$lib/api/types';
   import { playQueue, enqueueTrack } from '$lib/player/store.svelte';
-  import { FALLBACK_COVER, coverUrl } from '$lib/media/covers';
+  import { coverUrl } from '$lib/media/covers';
   import TrackMenu from './TrackMenu.svelte';
   import LikeButton from './LikeButton.svelte';
+  import Cover from './Cover.svelte';
 
   // Horizontal compact track row — cover thumb on the left, title +
   // artist on the right. Mirrors Android's CompactTrackTile so the
@@ -23,10 +24,6 @@
 
   const cover = $derived(coverUrl(track.album_id));
 
-  function onImgError(e: Event) {
-    (e.currentTarget as HTMLImageElement).src = FALLBACK_COVER;
-  }
-
   function onClick() {
     playQueue(sectionTracks, index);
   }
@@ -47,13 +44,7 @@
            hover:bg-surface-hover focus-visible:ring-2 focus-visible:ring-accent"
   >
     <div class="h-12 w-12 flex-shrink-0 overflow-hidden rounded bg-surface-hover">
-      <img
-        src={cover}
-        alt=""
-        class="h-full w-full object-cover"
-        loading="lazy"
-        onerror={onImgError}
-      />
+      <Cover src={cover} />
     </div>
     <div class="min-w-0 flex-1">
       <div class="truncate text-sm font-medium text-text-primary">{track.title}</div>

web/src/lib/components/Cover.svelte

@@ -0,0 +1,66 @@
+<script lang="ts">
+  import { FALLBACK_COVER } from '$lib/media/covers';
+  import { Disc3 } from 'lucide-svelte';
+
+  // Shared cover-artwork renderer. The web counterpart of Android's
+  // CoverTile/ServerImage: one place that owns the loading placeholder and
+  // the error fallback so no card sits blank while art loads or 404s (the
+  // "You might like" row surfaces unplayed items whose art is often not yet
+  // backfilled). Replaces the three hand-rolled <img> tags that previously
+  // disagreed on fallback handling.
+  let {
+    src,
+    alt = '',
+    shape = 'square',
+    fallback = 'image',
+    class: klass = ''
+  }: {
+    src: string | undefined;
+    alt?: string;
+    // 'round' clips to a circle (artist avatars); 'square' leaves clipping
+    // to the parent so existing rounded-md / rounded corners still apply.
+    shape?: 'square' | 'round';
+    // 'artist' degrades to a Disc3 icon; 'image' to the static placeholder
+    // cover. A null/empty src is treated the same as a failed load.
+    fallback?: 'image' | 'artist';
+    class?: string;
+  } = $props();
+
+  // Per-image lifecycle. Reset when src changes so a reused card (virtualized
+  // list, client-side nav) never keeps a stale 'loaded'/'failed'.
+  let loaded = $state(false);
+  let failed = $state(false);
+  $effect(() => {
+    void src;
+    loaded = false;
+    failed = false;
+  });
+
+  const useIcon = $derived(fallback === 'artist' && (failed || !src));
+  // On failure for the image fallback, swap to the static placeholder asset.
+  // src doesn't change on the second error, so there's no reload loop.
+  const imgSrc = $derived(failed ? FALLBACK_COVER : src);
+</script>
+
+<div
+  class="relative h-full w-full overflow-hidden bg-surface-hover {shape === 'round'
+    ? 'rounded-full'
+    : ''}"
+>
+  {#if useIcon}
+    <div class="flex h-full w-full items-center justify-center">
+      <Disc3 strokeWidth={1} class="h-4/5 w-4/5 text-text-muted" />
+    </div>
+  {:else if imgSrc}
+    <img
+      src={imgSrc}
+      {alt}
+      class="h-full w-full object-cover transition-opacity duration-200 {loaded
+        ? 'opacity-100'
+        : 'opacity-0'} {klass}"
+      loading="lazy"
+      onload={() => (loaded = true)}
+      onerror={() => (failed = true)}
+    />
+  {/if}
+</div>

web/src/lib/components/PlaylistCard.svelte

@@ -5,6 +5,7 @@
   import { user } from '$lib/auth/store.svelte';
   import { getPlaylist, systemShuffle, refreshSystem } from '$lib/api/playlists';
   import { playlistTrackToRef } from '$lib/playlists/playlistTrackToRef';
+  import { systemPlaylistRefetch } from '$lib/playlists/systemRefetch';
   import { errCode } from '$lib/api/errors';
   import { qk } from '$lib/api/queries';
   import { playQueue } from '$lib/player/store.svelte';
@@ -80,7 +81,14 @@
         const detail = await systemShuffle(variant);
         const refs = toTrackRefs(detail.tracks);
         if (refs.length > 0) {
-          playQueue(refs, 0, { source: variant });
+          playQueue(refs, 0, {
+            source: variant,
+            refetch: systemPlaylistRefetch({
+              variant,
+              playlistId: playlist.id,
+              perArtist: false,
+            }),
+          });
         }
       } else {
         const detail = await getPlaylist(playlist.id);
@@ -93,7 +101,14 @@
           // so source attribution stays absent — the PlaylistCard
           // test pins this contract.
           if (variant != null) {
-            playQueue(refs, 0, { source: variant });
+            playQueue(refs, 0, {
+              source: variant,
+              refetch: systemPlaylistRefetch({
+                variant,
+                playlistId: playlist.id,
+                perArtist: true,
+              }),
+            });
           } else {
             playQueue(refs, 0);
           }

web/src/lib/player/store.svelte.ts

@@ -83,6 +83,23 @@ let _radioRefreshInFlight = false;
 // queue clears it).
 let _queueSource = $state<string | null>(null);
 
+// Track B (#968): consecutive load failures since the last successful
+// 'playing'. A bad track auto-advances instead of dead-ending; the streak
+// (capped against queue length) stops a fully-unplayable queue from
+// looping forever. Reset on a successful play and on a fresh playQueue.
+let _failureStreak = 0;
+
+// Track B (#968): when a queue is seeded from a refreshable source (a system
+// playlist or radio), the seeder hands us a closure that re-pulls the fresh
+// snapshot. On total failure (whole queue unplayable — likely a stale tab
+// left open across the daily rebuild) we call it once to self-heal before
+// surfacing the dead-end. Kept opaque so the store stays decoupled from the
+// playlist API and the per-artist (songs_like_artist) identity problem.
+let _queueRefetch: (() => Promise<TrackRef[]>) | null = null;
+let _selfHealInFlight = false;
+let _selfHealAttempts = 0;
+const MAX_SELF_HEAL_ATTEMPTS = 1;
+
 let _audioEl: HTMLAudioElement | null = null;
 
 export const player = {
@@ -109,13 +126,20 @@ export function registerAudioEl(el: HTMLAudioElement | null): void {
 export function playQueue(
   tracks: TrackRef[],
   startIndex = 0,
-  opts: { shuffle?: boolean; source?: string | null } = {},
+  opts: {
+    shuffle?: boolean;
+    source?: string | null;
+    refetch?: () => Promise<TrackRef[]>;
+  } = {},
 ): void {
   _radioSeedId = null;  // M4c: non-radio enqueue clears the radio refresh state
   // #415: a fresh queue resets the system-playlist source. Set only
   // when seeded from a system playlist (server already returned the
   // rotation-aware order, so no client shuffle in that path).
   _queueSource = opts.source ?? null;
+  // #968: a fresh play replaces the self-heal closure + resets its budget.
+  _queueRefetch = opts.refetch ?? null;
+  _selfHealAttempts = 0;
   if (opts.shuffle && tracks.length > 1) {
     // Fisher-Yates over the whole list. startIndex is ignored — the
     // caller is asking for "random play from this pool," so the first
@@ -142,6 +166,7 @@ export function playQueue(
   _position = 0;
   _duration = 0;
   _error = null;
+  _failureStreak = 0;
 }
 
 export function togglePlay(): void {
@@ -263,6 +288,8 @@ export function reportStateFromAudio(
     case 'playing':
       _state = 'playing';
       _error = null;
+      _failureStreak = 0;
+      _selfHealAttempts = 0;
       return;
     case 'paused':
       _state = 'paused';
@@ -271,8 +298,7 @@ export function reportStateFromAudio(
       _state = 'loading';
       return;
     case 'error':
-      _state = 'error';
-      _error = detail ?? 'Playback failed.';
+      handleLoadFailure(detail);
       return;
     case 'ended':
       if (_repeat === 'one') {
@@ -301,6 +327,68 @@ export function reportStateFromAudio(
   }
 }
 
+// Track B (#968): a single failed track must not strand the player on the
+// "Try again" dead-end. Advance past it; only surface the error once the
+// whole queue has proven unplayable — every track failed, or we reached the
+// end with nothing playable. The streak cap (vs queue length) stops a
+// fully-broken queue from cycling forever instead of settling.
+function handleLoadFailure(detail?: string): void {
+  _failureStreak++;
+  if (_failureStreak < _queue.length && _index + 1 < _queue.length) {
+    _index++;
+    _position = 0;
+    _duration = 0;
+    _state = 'loading';
+    _error = null;
+    return;
+  }
+  // Whole queue is unplayable. If it came from a refreshable source, the
+  // snapshot is probably stale — re-pull it and resume before giving up.
+  if (trySelfHeal()) return;
+  _state = 'error';
+  _error = detail ?? 'Playback failed.';
+}
+
+// #968: re-pull a stale refreshable queue. Returns true if a self-heal was
+// started (caller must not dead-end). Bounded to one attempt per exhaustion
+// (reset on the next successful play) so a still-broken refresh can't loop.
+function trySelfHeal(): boolean {
+  if (_selfHealInFlight) return true;
+  if (_queueRefetch === null) return false;
+  if (_selfHealAttempts >= MAX_SELF_HEAL_ATTEMPTS) return false;
+  _selfHealAttempts++;
+  _selfHealInFlight = true;
+  _state = 'loading';
+  _error = null;
+  const refetch = _queueRefetch;
+  void refetch()
+    .then((refs) => {
+      if (refs.length > 0) {
+        // Re-seed in place — keep _queueSource / _queueRefetch so the new
+        // snapshot can itself self-heal, and don't reset _selfHealAttempts
+        // (only a successful 'playing' clears the budget).
+        _queue = refs;
+        _index = 0;
+        _position = 0;
+        _duration = 0;
+        _failureStreak = 0;
+        _state = 'loading';
+        _error = null;
+      } else {
+        _state = 'error';
+        _error = 'Nothing playable in this mix right now.';
+      }
+    })
+    .catch(() => {
+      _state = 'error';
+      _error = 'Couldn’t refresh this mix. Try again.';
+    })
+    .finally(() => {
+      _selfHealInFlight = false;
+    });
+  return true;
+}
+
 export function enqueueTrack(t: TrackRef): void {
   _radioSeedId = null;  // M4c
   _queue = [..._queue, t];
@@ -345,12 +433,19 @@ export function playNextMany(ts: TrackRef[]): void {
   _queue = [..._queue.slice(0, next), ...ts, ..._queue.slice(next)];
 }
 
-export async function playRadio(seedTrackId: string): Promise<void> {
+async function fetchRadioTracks(seedTrackId: string): Promise<TrackRef[]> {
   const resp = await api.get<RadioResponse>(
     `/api/radio?seed_track=${encodeURIComponent(seedTrackId)}`
   );
-  if (resp.tracks.length === 0) return;
-  playQueue(resp.tracks, 0);
+  return resp.tracks;
+}
+
+export async function playRadio(seedTrackId: string): Promise<void> {
+  const tracks = await fetchRadioTracks(seedTrackId);
+  if (tracks.length === 0) return;
+  // #968: hand the player a self-heal closure so a fully-stale radio queue
+  // re-seeds from the same track instead of dead-ending.
+  playQueue(tracks, 0, { refetch: () => fetchRadioTracks(seedTrackId) });
   _radioSeedId = seedTrackId;  // M4c: set AFTER playQueue (which clears it)
 }
 

web/src/lib/player/store.test.ts

@@ -288,6 +288,50 @@ describe('player store — shuffle + repeat + audio reports', () => {
     expect(player.state).toBe('error');
     expect(player.error).toBe('network lost');
   });
+
+  test('reportStateFromAudio("error") auto-advances past a bad track', () => {
+    playQueue([track('1'), track('2'), track('3')]);
+    reportStateFromAudio('error', 'boom');
+    expect(player.index).toBe(1);
+    expect(player.state).toBe('loading');
+    expect(player.error).toBeNull();
+  });
+
+  test('reportStateFromAudio("error") dead-ends once the whole queue is unplayable', () => {
+    playQueue([track('1'), track('2')]);
+    reportStateFromAudio('error', 'boom'); // track 1 fails → skip to track 2
+    expect(player.index).toBe(1);
+    expect(player.state).toBe('loading');
+    reportStateFromAudio('error', 'boom'); // track 2 also fails → exhausted
+    expect(player.state).toBe('error');
+    expect(player.error).toBe('boom');
+  });
+
+  test('reportStateFromAudio("error") self-heals a refreshable queue on total failure', async () => {
+    const fresh = [track('a'), track('b')];
+    const refetch = vi.fn().mockResolvedValue(fresh);
+    playQueue([track('1')], 0, { source: 'for_you', refetch });
+    reportStateFromAudio('error', 'boom'); // sole track fails → exhausted → self-heal
+    expect(refetch).toHaveBeenCalledOnce();
+    expect(player.state).toBe('loading');
+    await Promise.resolve();
+    await Promise.resolve();
+    await Promise.resolve();
+    expect(player.queue.map((t) => t.id)).toEqual(['a', 'b']);
+    expect(player.index).toBe(0);
+  });
+
+  test('self-heal fires at most once per exhaustion, then dead-ends', async () => {
+    const refetch = vi.fn().mockResolvedValue([track('x')]);
+    playQueue([track('1')], 0, { source: 'for_you', refetch });
+    reportStateFromAudio('error', 'boom'); // exhausted → self-heal #1
+    await Promise.resolve();
+    await Promise.resolve();
+    await Promise.resolve();
+    reportStateFromAudio('error', 'boom'); // re-pulled track also fails; budget spent → error
+    expect(player.state).toBe('error');
+    expect(refetch).toHaveBeenCalledOnce();
+  });
 });
 
 import {

web/src/lib/playlists/systemRefetch.ts

@@ -0,0 +1,33 @@
+import type { TrackRef, PlaylistDetail } from '$lib/api/types';
+import { systemShuffle, getPlaylist } from '$lib/api/playlists';
+import { playlistTrackToRef } from './playlistTrackToRef';
+
+// #968: builds the self-heal closure for a system-playlist queue. On total
+// playback failure (every queued track unplayable — typically a stale tab
+// left open across the daily rebuild) the player calls this to re-pull the
+// current snapshot and resume.
+//
+// Single-instance variants (for_you, discover, deep_cuts, …) re-pull by
+// variant via the rotation-aware shuffle endpoint. Per-artist mixes
+// (songs_like_artist — one playlist per seed artist) can't be addressed by
+// variant alone, so they re-pull by playlist id. Mirrors the play routing
+// in PlaylistCard.
+
+function toRefs(detail: PlaylistDetail): TrackRef[] {
+  return detail.tracks
+    .map((r) => playlistTrackToRef(r))
+    .filter((t): t is TrackRef => t !== null);
+}
+
+export function systemPlaylistRefetch(opts: {
+  variant: string;
+  playlistId: string;
+  perArtist: boolean;
+}): () => Promise<TrackRef[]> {
+  return async () => {
+    const detail = opts.perArtist
+      ? await getPlaylist(opts.playlistId)
+      : await systemShuffle(opts.variant);
+    return toRefs(detail);
+  };
+}

web/src/lib/serverEvents.svelte.ts

@@ -0,0 +1,50 @@
+import { queryClient } from '$lib/query/client';
+import { qk } from '$lib/api/queries';
+import { user } from '$lib/auth/store.svelte';
+
+// Inbound server events over SSE (#968). The web client's OUTBOUND half
+// (play events) lives in player/events.svelte.ts; this is the inbound
+// listener it never had. Today it reacts to `playlist.system_rebuilt` — the
+// daily 03:00 rebuild or a manual refresh — by invalidating the home +
+// system-playlist query caches so a tab left open across the rebuild stops
+// serving yesterday's snapshot (the stale-browse-view bug). Active playback
+// self-heals separately on the failure path (store.handleLoadFailure); we
+// deliberately do NOT yank a playing queue here — that would interrupt a
+// mid-song listen to restart the new mix at track 0.
+
+// Monotonic rebuild counter (#980). Bumped on every playlist.system_rebuilt.
+// An open system-playlist DETAIL page can't be invalidated in place (its id
+// rotates on rebuild — a refetch would 404), so instead it watches this
+// counter and offers a "this mix was refreshed → Refresh" affordance that
+// re-resolves the variant to the new playlist.
+let _systemRebuildCount = $state(0);
+export const systemRebuilt = {
+  get count(): number {
+    return _systemRebuildCount;
+  }
+};
+
+function onSystemRebuilt(): void {
+  _systemRebuildCount++;
+  queryClient.invalidateQueries({ queryKey: qk.home() });
+  // Prefix match invalidates every kind ('user' | 'system' | 'all').
+  queryClient.invalidateQueries({ queryKey: ['playlists'] });
+  queryClient.invalidateQueries({ queryKey: qk.systemPlaylistsStatus() });
+}
+
+// Wire once from +layout.svelte's mount. Opens the stream only while
+// authenticated and closes it on logout; EventSource auto-reconnects on
+// transient network drops.
+export function useServerEvents(): void {
+  $effect(() => {
+    if (!user.value) return;
+    // Absent under SSR / jsdom — the listener simply no-ops there.
+    if (typeof EventSource === 'undefined') return;
+    const es = new EventSource('/api/events/stream');
+    es.addEventListener('playlist.system_rebuilt', onSystemRebuilt);
+    return () => {
+      es.removeEventListener('playlist.system_rebuilt', onSystemRebuilt);
+      es.close();
+    };
+  });
+}

web/src/routes/+layout.svelte

@@ -23,6 +23,7 @@
   } from '$lib/player/store.svelte';
   import { useMediaSession } from '$lib/player/mediaSession.svelte';
   import { useEventsDispatcher } from '$lib/player/events.svelte';
+  import { useServerEvents } from '$lib/serverEvents.svelte';
   import { useGlobalShortcuts } from '$lib/player/shortcuts.svelte';
   import { applyMetaThemeColor } from '$lib/theme/applyMetaThemeColor.svelte';
   import { audioLoader } from '$lib/player/audioLoader';
@@ -132,6 +133,7 @@
 
   useMediaSession();
   useEventsDispatcher();
+  useServerEvents();
   useGlobalShortcuts();
   applyMetaThemeColor();
 </script>

web/src/routes/admin/diagnostics/+page.svelte

@@ -0,0 +1,367 @@
+<script lang="ts">
+  import { pageTitle } from '$lib/branding';
+  import { Copy, Download, Activity } from 'lucide-svelte';
+  import { useQueryClient } from '@tanstack/svelte-query';
+  import {
+    createAdminDiagnosticsQuery,
+    createDiagnosticDevicesQuery,
+    createAdminUsersQuery,
+    updateUserDebugMode,
+    type AdminDiagnostic,
+    type DiagnosticsFilter
+  } from '$lib/api/admin';
+  import { qk } from '$lib/api/queries';
+  import { errMessage } from '$lib/api/errors';
+  import { pushToast } from '$lib/stores/toast.svelte';
+
+  // Device diagnostics timeline (M9). The operator enables debug-mode on
+  // an account (remotely, here), then watches the account's device(s)
+  // stream connectivity / UPnP-sync / power events. The point of the page
+  // is the EXPORT: filter to the window in question and copy/download the
+  // slice as JSON to hand off for analysis.
+
+  const client = useQueryClient();
+
+  const KINDS = [
+    'connectivity',
+    'playback',
+    'upnp_sync',
+    'power',
+    'lifecycle',
+    'heartbeat',
+    'http'
+  ] as const;
+
+  function kindLabel(k: string): string {
+    switch (k) {
+      case 'connectivity': return 'Connectivity';
+      case 'playback':     return 'Playback';
+      case 'upnp_sync':    return 'UPnP sync';
+      case 'power':        return 'Power';
+      case 'lifecycle':    return 'Lifecycle';
+      case 'heartbeat':    return 'Heartbeat';
+      case 'http':         return 'HTTP';
+      default:             return k;
+    }
+  }
+
+  // Default view = the most recent N events, no time window. The
+  // start/end window is an Advanced affordance.
+  const DEFAULT_LIMIT = 500;
+
+  // Filter state.
+  let accountId = $state('');
+  let clientId = $state('');
+  let kind = $state('');
+  let fromLocal = $state('');
+  let toLocal = $state('');
+  let limit = $state(DEFAULT_LIMIT);
+
+  // True when an explicit time window is set (drives the caption wording).
+  const hasWindow = $derived(Boolean(fromLocal || toLocal));
+
+  function resetWindow() {
+    fromLocal = '';
+    toLocal = '';
+    limit = DEFAULT_LIMIT;
+  }
+
+  // datetime-local (browser-local, no tz) → RFC3339 UTC the API accepts.
+  function toRfc(v: string): string | undefined {
+    if (!v) return undefined;
+    const d = new Date(v);
+    return Number.isNaN(d.getTime()) ? undefined : d.toISOString();
+  }
+
+  const filter = $derived<DiagnosticsFilter>({
+    userId: accountId || undefined,
+    clientId: clientId || undefined,
+    kind: kind || undefined,
+    from: toRfc(fromLocal),
+    to: toRfc(toLocal),
+    limit
+  });
+
+  const usersStore = $derived(createAdminUsersQuery());
+  const usersQuery = $derived($usersStore);
+  const users = $derived(usersQuery.data ?? []);
+  const selectedUser = $derived(users.find((u) => u.id === accountId));
+
+  const devicesStore = $derived(createDiagnosticDevicesQuery(accountId || undefined));
+  const devicesQuery = $derived($devicesStore);
+  const devices = $derived(devicesQuery.data ?? []);
+
+  // Display sort. The API returns newest-first; default the view to that
+  // (most recent at the top), with an Oldest-first option for reading a
+  // timeline top-to-bottom. Export follows whatever's displayed.
+  let sortOrder = $state<'newest' | 'oldest'>('newest');
+
+  const diagStore = $derived(createAdminDiagnosticsQuery(filter));
+  const diagQuery = $derived($diagStore);
+  const rows = $derived.by(() => {
+    const data = [...((diagQuery.data ?? []) as AdminDiagnostic[])]; // newest-first
+    return sortOrder === 'oldest' ? data.reverse() : data;
+  });
+
+  function fmtTime(iso: string): string {
+    const d = new Date(iso);
+    return Number.isNaN(d.getTime()) ? iso : d.toLocaleString();
+  }
+
+  function payloadPreview(p: Record<string, unknown>): string {
+    const s = JSON.stringify(p);
+    return s.length > 120 ? s.slice(0, 120) + '…' : s;
+  }
+
+  // Toggle the selected account's debug-mode remotely.
+  let toggling = $state(false);
+  async function toggleDebug() {
+    if (!selectedUser) return;
+    toggling = true;
+    try {
+      await updateUserDebugMode(selectedUser.id, !selectedUser.debug_mode_enabled);
+      await client.invalidateQueries({ queryKey: qk.adminUsers() });
+      pushToast(
+        `Debug mode ${selectedUser.debug_mode_enabled ? 'disabled' : 'enabled'} for ${selectedUser.username}`
+      );
+    } catch (e: unknown) {
+      pushToast(`Toggle failed: ${errMessage(e)}`, 'error');
+    } finally {
+      toggling = false;
+    }
+  }
+
+  // Export the current (chronological) slice as an analysis-ready object.
+  function exportObject() {
+    return {
+      account: selectedUser?.username ?? accountId ?? 'all',
+      device: clientId || 'all',
+      kind: kind || 'all',
+      from: toRfc(fromLocal) ?? null,
+      to: toRfc(toLocal) ?? null,
+      count: rows.length,
+      events: rows.map((r) => ({
+        occurred_at: r.occurred_at,
+        received_at: r.received_at,
+        kind: r.kind,
+        client_id: r.client_id,
+        app_version: r.app_version,
+        os_version: r.os_version,
+        payload: r.payload
+      }))
+    };
+  }
+
+  async function onCopyJson() {
+    try {
+      await navigator.clipboard.writeText(JSON.stringify(exportObject(), null, 2));
+      pushToast(`Copied ${rows.length} events to clipboard`);
+    } catch (e: unknown) {
+      pushToast(`Copy failed: ${errMessage(e)}`, 'error');
+    }
+  }
+
+  function onDownloadNdjson() {
+    const lines = exportObject().events.map((e) => JSON.stringify(e)).join('\n');
+    const blob = new Blob([lines], { type: 'application/x-ndjson' });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    const who = selectedUser?.username ?? 'all';
+    a.href = url;
+    a.download = `diagnostics-${who}-${Date.now()}.ndjson`;
+    a.click();
+    URL.revokeObjectURL(url);
+  }
+</script>
+
+<svelte:head><title>{pageTitle('Admin · Diagnostics')}</title></svelte:head>
+
+<div class="space-y-4">
+  <header>
+    <h1 class="font-display text-2xl font-medium text-text-primary">Device diagnostics</h1>
+    <p class="text-sm text-text-secondary">
+      Enable debug mode on an account to have its device(s) stream a timeseries
+      of connectivity, UPnP-sync, and power/Doze events here. Filter to the
+      window you care about, then copy or download the slice for analysis.
+    </p>
+  </header>
+
+  <!-- Account debug-mode control -->
+  <section class="rounded-md border border-border p-3">
+    <div class="flex flex-wrap items-end gap-3">
+      <label class="block text-xs text-text-secondary">
+        Account
+        <select
+          bind:value={accountId}
+          class="mt-1 block w-56 rounded border border-border bg-surface px-2 py-1.5 text-sm text-text-primary"
+        >
+          <option value="">All accounts</option>
+          {#each users as u (u.id)}
+            <option value={u.id}>{u.username}{u.debug_mode_enabled ? ' · debug on' : ''}</option>
+          {/each}
+        </select>
+      </label>
+
+      {#if selectedUser}
+        <button
+          type="button"
+          onclick={toggleDebug}
+          disabled={toggling}
+          class="rounded px-3 py-2 text-sm text-action-fg hover:opacity-90 disabled:opacity-50
+            {selectedUser.debug_mode_enabled ? 'bg-action-destructive' : 'bg-action-primary'}"
+        >
+          {selectedUser.debug_mode_enabled ? 'Disable debug mode' : 'Enable debug mode'}
+        </button>
+        <span class="inline-flex items-center gap-1 text-xs text-text-muted">
+          <Activity size={14} />
+          {selectedUser.debug_mode_enabled ? 'Reporting active' : 'Reporting off'}
+        </span>
+      {/if}
+    </div>
+  </section>
+
+  <!-- Filters. Default view = most recent {DEFAULT_LIMIT} events, no time
+       window; the start/end window lives under Advanced. -->
+  <section class="space-y-3">
+    <div class="flex flex-wrap items-end gap-3">
+      <label class="block text-xs text-text-secondary">
+        Device
+        <select
+          bind:value={clientId}
+          class="mt-1 block w-48 rounded border border-border bg-surface px-2 py-1.5 text-sm text-text-primary"
+        >
+          <option value="">All devices</option>
+          {#each devices as d (d.client_id)}
+            <option value={d.client_id}>{d.client_id.slice(0, 12)} · {d.event_count}</option>
+          {/each}
+        </select>
+      </label>
+      <label class="block text-xs text-text-secondary">
+        Kind
+        <select
+          bind:value={kind}
+          class="mt-1 block w-40 rounded border border-border bg-surface px-2 py-1.5 text-sm text-text-primary"
+        >
+          <option value="">All kinds</option>
+          {#each KINDS as k (k)}
+            <option value={k}>{kindLabel(k)}</option>
+          {/each}
+        </select>
+      </label>
+      <label class="block text-xs text-text-secondary">
+        Sort
+        <select
+          bind:value={sortOrder}
+          class="mt-1 block w-36 rounded border border-border bg-surface px-2 py-1.5 text-sm text-text-primary"
+        >
+          <option value="newest">Newest first</option>
+          <option value="oldest">Oldest first</option>
+        </select>
+      </label>
+
+      <div class="ml-auto flex gap-2">
+        <button
+          type="button"
+          onclick={onCopyJson}
+          disabled={rows.length === 0}
+          class="inline-flex items-center gap-1.5 rounded border border-border px-3 py-2 text-sm text-text-primary hover:bg-surface-hover disabled:opacity-50"
+        >
+          <Copy size={15} /> Copy JSON
+        </button>
+        <button
+          type="button"
+          onclick={onDownloadNdjson}
+          disabled={rows.length === 0}
+          class="inline-flex items-center gap-1.5 rounded border border-border px-3 py-2 text-sm text-text-primary hover:bg-surface-hover disabled:opacity-50"
+        >
+          <Download size={15} /> Download
+        </button>
+      </div>
+    </div>
+
+    <!-- Advanced: explicit start/end window + row cap. Collapsed by
+         default so the common case (recent N) needs no interaction. -->
+    <details class="rounded-md border border-border" open={hasWindow}>
+      <summary class="cursor-pointer px-3 py-2 text-xs text-text-secondary">
+        Advanced filters{hasWindow ? ' · window active' : ''}
+      </summary>
+      <div class="flex flex-wrap items-end gap-3 border-t border-border px-3 py-3">
+        <label class="block text-xs text-text-secondary">
+          From
+          <input
+            type="datetime-local"
+            bind:value={fromLocal}
+            class="mt-1 block rounded border border-border bg-surface px-2 py-1.5 text-sm text-text-primary"
+          />
+        </label>
+        <label class="block text-xs text-text-secondary">
+          To
+          <input
+            type="datetime-local"
+            bind:value={toLocal}
+            class="mt-1 block rounded border border-border bg-surface px-2 py-1.5 text-sm text-text-primary"
+          />
+        </label>
+        <label class="block text-xs text-text-secondary">
+          Limit
+          <input
+            type="number"
+            min="1"
+            max="5000"
+            bind:value={limit}
+            class="mt-1 block w-24 rounded border border-border bg-surface px-2 py-1.5 text-sm text-text-primary"
+          />
+        </label>
+        <button
+          type="button"
+          onclick={resetWindow}
+          class="rounded border border-border px-3 py-2 text-sm text-text-secondary hover:bg-surface-hover"
+        >
+          Reset to recent {DEFAULT_LIMIT}
+        </button>
+      </div>
+    </details>
+  </section>
+
+  <!-- Timeline -->
+  {#if diagQuery.isError}
+    <p class="text-error">Couldn't load: {errMessage(diagQuery.error)}</p>
+  {:else if diagQuery.isPending}
+    <p class="text-text-secondary">Loading…</p>
+  {:else if rows.length === 0}
+    <p class="text-text-secondary">
+      No events for this filter. Enable debug mode on an account and have the
+      device reproduce the issue — events appear here within a minute.
+    </p>
+  {:else}
+    <div class="flex items-center justify-between">
+      <span class="text-xs text-text-muted">
+        {#if hasWindow}
+          {rows.length} events in window ({sortOrder === 'newest' ? 'newest' : 'oldest'} first)
+        {:else}
+          Most recent {rows.length} events ({sortOrder === 'newest' ? 'newest' : 'oldest'} first) · set a time window under Advanced
+        {/if}
+      </span>
+    </div>
+    <ul class="divide-y divide-border rounded-md border border-border font-mono text-xs">
+      {#each rows as r (r.id)}
+        <li class="flex items-start gap-3 px-3 py-2">
+          <span class="w-44 shrink-0 text-text-muted" title={`received ${fmtTime(r.received_at)}`}>
+            {fmtTime(r.occurred_at)}
+          </span>
+          <span
+            class="w-24 shrink-0 rounded bg-surface-hover px-1.5 py-0.5 text-center text-[10px] uppercase tracking-wide text-text-secondary"
+          >
+            {kindLabel(r.kind)}
+          </span>
+          <details class="min-w-0 flex-1">
+            <summary class="cursor-pointer truncate text-text-primary">
+              {payloadPreview(r.payload)}
+            </summary>
+            <pre class="mt-1 overflow-x-auto whitespace-pre-wrap text-text-secondary">{JSON.stringify(r.payload, null, 2)}</pre>
+          </details>
+        </li>
+      {/each}
+    </ul>
+  {/if}
+</div>

web/src/routes/admin/users/users.test.ts

@@ -38,6 +38,7 @@ const alice: AdminUser = {
   display_name: null,
   is_admin: true,
   auto_approve_requests: false,
+  debug_mode_enabled: false,
   created_at: '2026-05-01T00:00:00Z'
 };
 
@@ -47,6 +48,7 @@ const bob: AdminUser = {
   display_name: 'Bob B',
   is_admin: false,
   auto_approve_requests: false,
+  debug_mode_enabled: false,
   created_at: '2026-05-02T00:00:00Z'
 };
 

web/src/routes/playlists/[id]/+page.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
   import { page } from '$app/state';
   import { goto } from '$app/navigation';
+  import { untrack } from 'svelte';
   import { pageTitle } from '$lib/branding';
   import { Pencil, Trash2, Link as LinkIcon } from 'lucide-svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
@@ -12,12 +13,15 @@
     deletePlaylist,
     removePlaylistTrack,
     reorderPlaylist,
-    refreshSystem
+    refreshSystem,
+    systemShuffle
   } from '$lib/api/playlists';
   import { qk } from '$lib/api/queries';
   import { user } from '$lib/auth/store.svelte';
   import { errCode, errMessage } from '$lib/api/errors';
   import { playQueue } from '$lib/player/store.svelte';
+  import { systemPlaylistRefetch } from '$lib/playlists/systemRefetch';
+  import { systemRebuilt } from '$lib/serverEvents.svelte';
   import { pushToast } from '$lib/stores/toast.svelte';
   import type { TrackRef } from '$lib/api/types';
 
@@ -61,17 +65,32 @@
 
   function onPlay(position: number) {
     if (!playlistQuery?.data) return;
+    const data = playlistQuery.data;
     // Skip rows where track_id is null (track was removed from library).
-    const live = playlistQuery.data.tracks
-      .filter((t) => t.track_id !== null)
-      .map(toTrackRef);
+    const live = data.tracks.filter((t) => t.track_id !== null).map(toTrackRef);
     // Find which `live` index corresponds to the clicked position. Some
     // positions in the original list may be unavailable (filtered out),
     // so the index in the playable list != the playlist position.
-    const clickedTrackID = playlistQuery.data.tracks.find((t) => t.position === position)?.track_id;
+    const clickedTrackID = data.tracks.find((t) => t.position === position)?.track_id;
     const startIdx = live.findIndex((t) => t.id === clickedTrackID);
+    // #968: a system playlist played from its detail page is tagged with its
+    // source (so play_started advances the rotation, matching the home tile and
+    // the Android detail screen) and gets the self-heal closure so a stale
+    // snapshot re-pulls on total failure.
+    const variant = data.system_variant;
+    if (variant != null) {
+      playQueue(live, Math.max(0, startIdx), {
+        source: variant,
+        refetch: systemPlaylistRefetch({
+          variant,
+          playlistId: id,
+          perArtist: data.seed_artist_id != null
+        })
+      });
+    } else {
       playQueue(live, Math.max(0, startIdx));
     }
+  }
 
   function toTrackRef(t: {
     track_id: string | null;
@@ -158,6 +177,40 @@
       refreshingSystem = false;
     }
   }
+
+  // --- #980: stale-view banner for an open system-playlist detail page ---
+  // The daily rebuild rotates the playlist id, so this page's cached data goes
+  // stale and can't be refetched in place (the old id 404s). Watch the global
+  // rebuild counter; when it advances while we're on a system playlist, offer a
+  // Refresh that re-resolves the variant to the fresh playlist.
+  const isSystemPlaylist = $derived(playlistQuery?.data?.system_variant != null);
+  // Baseline starts at the current count so a rebuild earlier this session
+  // doesn't flash the banner on open; re-synced on navigation below.
+  let acknowledgedRebuild = $state(systemRebuilt.count);
+  $effect(() => {
+    id; // re-sync the baseline whenever we land on a different playlist
+    acknowledgedRebuild = untrack(() => systemRebuilt.count);
+  });
+  const staleSystemView = $derived(
+    isSystemPlaylist && systemRebuilt.count > acknowledgedRebuild
+  );
+
+  let reloadingStale = $state(false);
+  async function onReloadStale() {
+    const variant = playlistQuery?.data?.system_variant;
+    if (!variant) return;
+    reloadingStale = true;
+    try {
+      // The rebuild minted a new playlist id for this variant; resolve it and
+      // navigate there so the page loads the fresh mix.
+      const fresh = await systemShuffle(variant);
+      await goto(`/playlists/${fresh.id}`);
+    } catch (e: unknown) {
+      pushToast(`Couldn’t load the refreshed mix: ${errCode(e)}`, 'error');
+    } finally {
+      reloadingStale = false;
+    }
+  }
 </script>
 
 <svelte:head>
@@ -171,6 +224,24 @@
     <ApiErrorBanner error={playlistQuery.error} onRetry={() => playlistQuery.refetch()} />
   {:else if playlistQuery?.data}
     {@const pl = playlistQuery.data}
+    {#if staleSystemView}
+      <div
+        role="status"
+        class="mb-4 flex items-center justify-between gap-3 rounded-md border border-accent/40
+               bg-accent/10 px-4 py-2.5 text-sm"
+      >
+        <span class="text-text-primary">This mix was refreshed since you opened it.</span>
+        <button
+          type="button"
+          onclick={onReloadStale}
+          disabled={reloadingStale}
+          class="flex-shrink-0 rounded-md bg-action-secondary px-3 py-1 text-xs font-medium
+                 text-action-fg disabled:opacity-50"
+        >
+          {reloadingStale ? 'Refreshing…' : 'Refresh'}
+        </button>
+      </div>
+    {/if}
     {#if !editing}
       <header class="mb-6 flex items-start gap-4">
         <div class="h-32 w-32 flex-shrink-0 overflow-hidden rounded-md bg-surface-hover">