build: drop the agent-specific gradle wrapper from the devshell

The flock/nice/worker-cap wrapper serialised local builds to protect the
shared box. That is now handled at the machine level (a GRADLE_OPTS cap
in nix-home), so the devshell goes back to the plain nix Gradle.

app/build.gradle.kts

@@ -30,7 +30,6 @@ android {
     buildFeatures {
         compose = true
         buildConfig = true
-        resValues = true
     }
 
     androidResources {
@@ -99,10 +98,13 @@ android {
         }
     }
 
+    sourceSets {
+        getByName("debug").res.srcDir("src/nightly/res")
+    }
+
     buildTypes {
         debug {
             applicationIdSuffix = ".nightly"
-            resValue("string", "app_name", "subtracks nightly")
         }
         release {
             isMinifyEnabled = true
@@ -115,7 +117,6 @@ android {
             initWith(getByName("release"))
             applicationIdSuffix = ".nightly"
             signingConfig = signingConfigs.getByName("debug")
-            resValue("string", "app_name", "subtracks nightly")
         }
     }
 }
@@ -157,10 +158,12 @@ val integrationTestClasses =
 
 val demoScreenshotClass = "com.subtracks.ui.DemoScreenshotTest"
 
+val queryTimingClass = "com.subtracks.data.db.QueryTimingMeasurementTest"
+
 tasks.withType<Test>().configureEach {
     if (name.endsWith("UnitTest")) {
         filter {
-            (integrationTestClasses + demoScreenshotClass).forEach { excludeTestsMatching(it) }
+            (integrationTestClasses + demoScreenshotClass + queryTimingClass).forEach { excludeTestsMatching(it) }
         }
     }
     testLogging {
@@ -196,6 +199,20 @@ tasks.register<Test>("demoScreenshots") {
     outputs.upToDateWhen { false }
 }
 
+tasks.register<Test>("queryTiming") {
+    description = "Measures SQL query timings for the logging threshold (not a CI gate)"
+    group = "verification"
+    val unitTest = tasks.named<Test>("testDebugUnitTest")
+    dependsOn("compileDebugUnitTestKotlin")
+    testClassesDirs = files(provider { unitTest.get().testClassesDirs })
+    classpath = files(provider { unitTest.get().classpath })
+    filter {
+        includeTestsMatching(queryTimingClass)
+    }
+    providers.gradleProperty("measureSongs").orNull?.let { systemProperty("measure.songs", it) }
+    outputs.upToDateWhen { false }
+}
+
 dependencies {
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.core.ktx)

app/src/main/AndroidManifest.xml

@@ -47,6 +47,16 @@
         <receiver
             android:name=".data.download.DownloadCancelReceiver"
             android:exported="false" />
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
     </application>
 
 </manifest>

app/src/main/kotlin/com/subtracks/SubtracksApp.kt

@@ -8,17 +8,23 @@ import coil3.network.okhttp.OkHttpNetworkFetcherFactory
 import com.subtracks.data.prefs.UserPreferences
 import com.subtracks.data.repo.ArtworkSeedStore
 import com.subtracks.di.appModule
+import com.subtracks.log.Log
 import com.subtracks.ui.theme.ArtworkSeedCache
-import okhttp3.OkHttpClient
 import org.koin.core.context.startKoin
 import org.koin.core.context.stopKoin
 
 class SubtracksApp : Application() {
-    private val http = OkHttpClient()
+    private val http =
+        UserAgent
+            .httpClient()
+            .newBuilder()
+            .addInterceptor(Log.interceptor())
+            .build()
 
     @OptIn(DelicateCoilApi::class)
     override fun onCreate() {
         super.onCreate()
+        Log.init(this)
         stopKoin()
         SingletonImageLoader.reset()
         val koin =

app/src/main/kotlin/com/subtracks/UserAgent.kt

@@ -0,0 +1,22 @@
+package com.subtracks
+
+import android.os.Build
+import okhttp3.Interceptor
+import okhttp3.OkHttpClient
+
+object UserAgent {
+    val value: String = "subtracks (Android ${Build.VERSION.RELEASE}; ${BuildConfig.VERSION_NAME})"
+
+    fun interceptor(): Interceptor =
+        Interceptor { chain ->
+            chain.proceed(
+                chain
+                    .request()
+                    .newBuilder()
+                    .header("User-Agent", value)
+                    .build(),
+            )
+        }
+
+    fun httpClient(): OkHttpClient = OkHttpClient.Builder().addInterceptor(interceptor()).build()
+}

app/src/main/kotlin/com/subtracks/data/db/Databases.kt

@@ -3,10 +3,14 @@ package com.subtracks.data.db
 import android.content.Context
 import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
+import com.subtracks.log.Log
 
-fun createAndroidDatabase(context: Context): SubtracksDatabase =
-    Room
+fun createAndroidDatabase(context: Context): SubtracksDatabase {
+    val driver = LoggingSQLiteDriver(BundledSQLiteDriver(), Log::sql)
+    return Room
         .databaseBuilder<SubtracksDatabase>(context, "subtracks.db")
-        .setDriver(BundledSQLiteDriver())
-        .addMigrations(*MIGRATIONS)
+        .setDriver(driver)
+        .addMigrations(*MIGRATIONS.map(::LoggedMigration).toTypedArray())
+        .addCallback(SqliteLifecycleLogging)
         .build()
+}

app/src/main/kotlin/com/subtracks/data/db/DbLogging.kt

@@ -0,0 +1,129 @@
+package com.subtracks.data.db
+
+import androidx.room3.RoomDatabase
+import androidx.room3.migration.Migration
+import androidx.sqlite.SQLiteConnection
+import androidx.sqlite.SQLiteDriver
+import androidx.sqlite.SQLiteStatement
+import com.subtracks.log.Log
+import kotlinx.coroutines.CancellationException
+
+data class SqlExecution(
+    val sql: String,
+    val durationNanos: Long,
+    val rows: Long,
+    val error: Throwable?,
+) {
+    val durationMillis: Double get() = durationNanos / 1_000_000.0
+}
+
+class LoggingSQLiteDriver(
+    private val delegate: SQLiteDriver,
+    private val onExecution: (SqlExecution) -> Unit,
+) : SQLiteDriver {
+    override val hasConnectionPool: Boolean
+        get() = delegate.hasConnectionPool
+
+    override fun open(fileName: String): SQLiteConnection = LoggingConnection(delegate.open(fileName), onExecution)
+}
+
+private class LoggingConnection(
+    private val delegate: SQLiteConnection,
+    private val onExecution: (SqlExecution) -> Unit,
+) : SQLiteConnection by delegate {
+    override fun prepare(sql: String): SQLiteStatement {
+        val start = System.nanoTime()
+        return try {
+            LoggingStatement(delegate.prepare(sql), sql, onExecution)
+        } catch (failure: Throwable) {
+            onExecution(SqlExecution(sql, System.nanoTime() - start, 0, failure))
+            throw failure
+        }
+    }
+}
+
+private class LoggingStatement(
+    private val delegate: SQLiteStatement,
+    private val sql: String,
+    private val onExecution: (SqlExecution) -> Unit,
+) : SQLiteStatement by delegate {
+    private var startNanos = 0L
+    private var rows = 0L
+    private var failure: Throwable? = null
+    private var active = false
+
+    override fun step(): Boolean {
+        begin()
+        val result =
+            try {
+                delegate.step()
+            } catch (error: Throwable) {
+                failure = error
+                report()
+                throw error
+            }
+        if (result) rows++
+        if (!result) report()
+        return result
+    }
+
+    override fun reset() {
+        report()
+        delegate.reset()
+    }
+
+    override fun close() {
+        report()
+        delegate.close()
+    }
+
+    private fun report() {
+        if (!active) return
+        active = false
+        onExecution(SqlExecution(sql, System.nanoTime() - startNanos, rows, failure))
+    }
+
+    // Started on the first step, not on reset: Room's statement cache resets a statement when it is
+    // returned to the cache (BasePreparedStatementCache.CachedStatement.close), so timing from reset
+    // would count however long the statement idled there before its next use.
+    private fun begin() {
+        if (active) return
+        startNanos = System.nanoTime()
+        rows = 0
+        failure = null
+        active = true
+    }
+}
+
+class LoggedMigration(
+    private val delegate: Migration,
+) : Migration(delegate.startVersion, delegate.endVersion) {
+    override suspend fun migrate(connection: SQLiteConnection) {
+        val label = "${delegate.startVersion} -> ${delegate.endVersion}"
+        Log.i("sql", "migrating $label")
+        val start = System.nanoTime()
+        try {
+            delegate.migrate(connection)
+        } catch (cancellation: CancellationException) {
+            throw cancellation
+        } catch (failure: Throwable) {
+            Log.e("sql", "migration $label failed after ${(System.nanoTime() - start) / 1_000_000}ms", failure)
+            throw failure
+        }
+        Log.i("sql", "migrated $label in ${(System.nanoTime() - start) / 1_000_000}ms")
+    }
+}
+
+internal object SqliteLifecycleLogging : RoomDatabase.Callback() {
+    override suspend fun onCreate(connection: SQLiteConnection) {
+        Log.i("sql", "created fresh database")
+    }
+
+    override suspend fun onOpen(connection: SQLiteConnection) {
+        Log.i("sql", "database opened")
+    }
+
+    override suspend fun onDestructiveMigration(connection: SQLiteConnection) {
+        Log.w("sql", "destructive migration: dropping all tables")
+    }
+}

app/src/main/kotlin/com/subtracks/data/db/QueueDao.kt

@@ -2,8 +2,8 @@ package com.subtracks.data.db
 
 import androidx.room3.Dao
 import androidx.room3.Insert
+import androidx.room3.OnConflictStrategy
 import androidx.room3.Query
-import androidx.room3.Upsert
 import com.subtracks.data.model.AlbumSongItem
 import com.subtracks.data.model.PlaybackCursor
 import com.subtracks.data.model.PlaylistSongItem
@@ -55,7 +55,7 @@ interface QueueDao {
     @Query("SELECT * FROM playback_cursor WHERE id = 1")
     suspend fun cursor(): PlaybackCursor?
 
-    @Upsert
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
     suspend fun setCursor(cursor: PlaybackCursor)
 
     @Query(

app/src/main/kotlin/com/subtracks/data/download/SystemDownloadEngine.kt

@@ -4,6 +4,7 @@ import android.app.DownloadManager
 import android.content.Context
 import android.os.Environment
 import androidx.core.net.toUri
+import com.subtracks.UserAgent
 import com.subtracks.data.model.DownloadError
 
 class SystemDownloadEngine(
@@ -16,6 +17,7 @@ class SystemDownloadEngine(
                 .setTitle(request.title)
                 .setDestinationInExternalFilesDir(context, Environment.DIRECTORY_MUSIC, request.path)
                 .setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN)
+                .addRequestHeader("User-Agent", UserAgent.value)
                 // Wi-Fi only unless the preference allows a metered network, and roaming counts as
                 // one of those; the platform otherwise permits it by default.
                 .setAllowedOverMetered(request.allowMetered)

app/src/main/kotlin/com/subtracks/data/prefs/UserPreferences.kt

@@ -121,6 +121,14 @@ class UserPreferences(
 
     private val offlineModeKey = booleanPreferencesKey("offline_mode")
 
+    fun verboseLogging(): Flow<Boolean> = store.data.map { prefs -> prefs[verboseLoggingKey] ?: false }
+
+    suspend fun setVerboseLogging(enabled: Boolean) {
+        store.edit { prefs -> prefs[verboseLoggingKey] = enabled }
+    }
+
+    private val verboseLoggingKey = booleanPreferencesKey("verbose_logging")
+
     suspend fun lastSeed(): ArtworkSeedValue? {
         val prefs = store.data.first()
         val cacheKey = prefs[lastSeedKey] ?: return null

app/src/main/kotlin/com/subtracks/data/repo/DownloadRepository.kt

@@ -19,6 +19,7 @@ import com.subtracks.data.model.DownloadedSong
 import com.subtracks.data.model.ListDownloadStatus
 import com.subtracks.data.model.SongDownload
 import com.subtracks.data.model.coverArtKey
+import com.subtracks.log.Log
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CompletableDeferred
 import kotlinx.coroutines.CoroutineDispatcher
@@ -79,7 +80,10 @@ class DownloadRepository(
         }
         scope.launch {
             sourceRepository.offline.collect { offline ->
-                if (offline) cancelActive()
+                if (offline) {
+                    Log.i("download", "offline: cancelling active downloads")
+                    cancelActive()
+                }
             }
         }
     }
@@ -140,6 +144,7 @@ class DownloadRepository(
         dir(sourceId).mkdirs()
         file(sourceId, songId).delete()
         db.downloadDao().upsert(SongDownload(sourceId = sourceId, songId = songId, status = DownloadStatus.Queued))
+        Log.i("download", "queued song=$songId (source $sourceId)")
         ensurePolling()
         return true
     }
@@ -336,6 +341,7 @@ class DownloadRepository(
 
     private suspend fun removeRows(rows: List<SongDownload>) {
         if (rows.isEmpty()) return
+        Log.i("download", "removed ${rows.size} download(s)")
         val engineIds = rows.mapNotNull { it.engineId }
         if (engineIds.isNotEmpty()) engine.cancel(engineIds)
         rows.groupBy { it.sourceId }.forEach { (sourceId, group) ->
@@ -581,6 +587,14 @@ class DownloadRepository(
                     },
             )
         if (updated != row) db.downloadDao().upsert(updated)
+        if (updated.status != row.status) {
+            when (updated.status) {
+                DownloadStatus.Completed -> Log.i("download", "completed ${row.songId} (${updated.total} bytes)")
+                DownloadStatus.Failed -> Log.w("download", "failed ${row.songId}: ${updated.error}")
+                DownloadStatus.Running -> Log.i("download", "started ${row.songId}")
+                DownloadStatus.Queued -> Unit
+            }
+        }
     }
 
     private suspend fun markFailed(
@@ -590,6 +604,7 @@ class DownloadRepository(
         row.engineId?.let { engine.cancel(listOf(it)) }
         file(row.sourceId, row.songId).delete()
         db.downloadDao().upsert(row.copy(status = DownloadStatus.Failed, engineId = null, error = error))
+        Log.w("download", "failed ${row.songId}: $error")
     }
 
     private fun ensurePolling() {

app/src/main/kotlin/com/subtracks/data/repo/LibraryRepository.kt

@@ -24,6 +24,7 @@ import com.subtracks.data.prefs.PlaylistSort
 import com.subtracks.data.prefs.StarredFilter
 import com.subtracks.data.source.ServerActionSink
 import com.subtracks.data.source.StarType
+import com.subtracks.log.Log
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -464,14 +465,17 @@ class LibraryRepository(
         }
         val previous = starredValue(sourceId, type, id)
         updateStarred(sourceId, type, id, if (starred) System.currentTimeMillis() else null)
+        val action = if (starred) "star" else "unstar"
         return try {
             serverActions.setStar(type, id, starred)
+            Log.i("star", "$action ${type.name.lowercase()} $id")
             Result.success(Unit)
         } catch (cancellation: CancellationException) {
             throw cancellation
         } catch (failure: Exception) {
             withContext(NonCancellable) { updateStarred(sourceId, type, id, previous) }
             showMessage(UiMessage(R.string.star_update_failed))
+            Log.w("star", "failed to $action ${type.name.lowercase()} $id", failure)
             Result.failure(failure)
         }
     }

app/src/main/kotlin/com/subtracks/data/repo/PendingServerActionSink.kt

@@ -6,6 +6,7 @@ import com.subtracks.data.model.PendingActionKind
 import com.subtracks.data.source.ServerActionSink
 import com.subtracks.data.source.StarType
 import com.subtracks.data.source.subsonic.SubsonicException
+import com.subtracks.log.Log
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.Flow
@@ -29,8 +30,13 @@ class PendingServerActionSink(
 
     init {
         scope.launch {
+            var lastReady: Boolean? = null
             combine(offlinePreferences, networkAvailable) { isOffline, online -> !isOffline && online }
                 .collect { ready ->
+                    if (ready && lastReady == false) {
+                        Log.i("net", "connection available, replaying pending server actions")
+                    }
+                    lastReady = ready
                     // The persisted flag and connectivity are authoritative, unlike the process
                     // flag's default at cold start, so wait for that flag to agree before replaying.
                     if (ready) {
@@ -96,12 +102,14 @@ class PendingServerActionSink(
         for (action in dao.pending(sourceId)) {
             try {
                 deliver(action)
+                Log.i("net", "replayed ${action.kind.name.lowercase()} ${action.targetId}")
             } catch (cancellation: CancellationException) {
                 throw cancellation
             } catch (failure: Exception) {
                 // Still unreachable: keep this and the remaining actions for the next attempt.
                 if (isRetryable(failure)) return
                 // The server answered and refused; drop the action rather than block the queue.
+                Log.w("net", "dropped ${action.kind.name.lowercase()} ${action.targetId}", failure)
             }
             dao.delete(action.id)
         }
@@ -139,6 +147,7 @@ class PendingServerActionSink(
         db.pendingActionDao().replace(
             PendingAction(sourceId = sourceId, kind = kind, targetId = targetId, starType = starType, time = time),
         )
+        Log.i("net", "queued ${kind.name.lowercase()} $targetId")
         return true
     }
 

app/src/main/kotlin/com/subtracks/data/repo/SourceRepository.kt

@@ -17,6 +17,7 @@ import com.subtracks.data.source.MusicSource
 import com.subtracks.data.source.declaredStreamLength
 import com.subtracks.data.source.streamLengthSuffix
 import com.subtracks.data.source.subsonic.SubsonicClient
+import com.subtracks.log.Log
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
@@ -46,6 +47,13 @@ class SourceRepository(
         val source: SubsonicMusicSource,
     )
 
+    private data class ResolvedSource(
+        val config: SubsonicConfig?,
+        val quality: StreamQuality,
+        val mode: NetworkMode,
+        val concurrency: Int,
+    )
+
     @Volatile
     private var active: ActiveSource? = null
 
@@ -64,6 +72,7 @@ class SourceRepository(
     fun downloadsAllowedOverMetered(): Boolean = allowMeteredDownloads
 
     fun setOfflineMode(enabled: Boolean) {
+        Log.i("net", "offline mode -> $enabled")
         scope.launch { prefs.setOfflineMode(enabled) }
     }
 
@@ -81,6 +90,7 @@ class SourceRepository(
             // Read the persisted flag before the source config can build a source or probe it, so a
             // cold start with offline on never touches the network.
             _offline.value = prefs.offlineMode().first()
+            var lastMode: NetworkMode? = null
             combine(
                 db.sourcesDao().activeSubsonicConfig(),
                 networkMode,
@@ -88,13 +98,23 @@ class SourceRepository(
                 prefs.streamQuality(NetworkMode.Mobile),
                 prefs.syncConcurrency(),
             ) { config, mode, wifi, mobile, concurrency ->
-                Triple(config, if (mode == NetworkMode.Wifi) wifi else mobile, concurrency)
-            }.collect { (config, quality, concurrency) ->
+                ResolvedSource(config, if (mode == NetworkMode.Wifi) wifi else mobile, mode, concurrency)
+            }.collect { (config, quality, mode, concurrency) ->
+                if (mode != lastMode) {
+                    Log.i("net", "network mode -> ${mode.key}")
+                    lastMode = mode
+                }
                 val sourceChanged = config?.id != active?.id
+                if (sourceChanged) {
+                    Log.i("net", "active source -> ${config?.name ?: "none"}")
+                }
                 active = config?.let { ActiveSource(it.id, it.toMusicSource(quality, concurrency)) }
                 _quality.value = quality
                 if (sourceChanged && config != null && config.useTokenAuth && !_offline.value) {
-                    scope.launch { runCatching { config.toClient().check("ping") } }
+                    scope.launch {
+                        runCatching { config.toClient().check("ping") }
+                            .onSuccess { Log.i("net", "connected (ping ok)") }
+                    }
                 }
             }
         }

app/src/main/kotlin/com/subtracks/data/source/subsonic/SubsonicClient.kt

@@ -2,6 +2,7 @@ package com.subtracks.data.source.subsonic
 
 import com.subtracks.R
 import com.subtracks.UiMessage
+import com.subtracks.log.Log
 import okhttp3.HttpUrl
 import okhttp3.OkHttpClient
 import okhttp3.Request
@@ -20,7 +21,6 @@ class SubsonicClient(
     private val password: String,
     useTokenAuth: Boolean,
     private val http: OkHttpClient,
-    private val userAgent: String = "subtracks/android",
     private val onTokenAuthUnsupported: () -> Unit = {},
 ) {
     @Volatile
@@ -61,7 +61,11 @@ class SubsonicClient(
         return try {
             execute(method, params, body)
         } catch (failure: SubsonicException) {
-            if (failure.code !in TOKEN_AUTH_UNSUPPORTED_CODES || !usedTokenAuth) throw failure
+            if (failure.code !in TOKEN_AUTH_UNSUPPORTED_CODES || !usedTokenAuth) {
+                Log.w("http", "$method failed: server code ${failure.code} \"${failure.message}\"")
+                throw failure
+            }
+            Log.w("http", "$method: token auth unsupported (server code ${failure.code}), retrying with plaintext")
             disableTokenAuth()
             execute(method, params, body)
         }
@@ -76,7 +80,6 @@ class SubsonicClient(
             Request
                 .Builder()
                 .url(uri(method, params))
-                .header("User-Agent", userAgent)
                 .build()
         http.newCall(request).execute().use { response ->
             if (!response.isSuccessful) {

app/src/main/kotlin/com/subtracks/data/sync/SyncManager.kt

@@ -1,6 +1,5 @@
 package com.subtracks.data.sync
 
-import android.util.Log
 import com.subtracks.R
 import com.subtracks.UiMessage
 import com.subtracks.data.db.SubtracksDatabase
@@ -8,6 +7,7 @@ import com.subtracks.data.repo.QueueRepository
 import com.subtracks.data.repo.SourceRepository
 import com.subtracks.data.source.ServerActionSink
 import com.subtracks.data.source.subsonic.SubsonicException
+import com.subtracks.log.Log
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -59,16 +59,24 @@ class SyncManager(
             return
         }
         _status.value = SyncStatus.Running
+        val startedAt = System.nanoTime()
         val result =
             try {
                 val source = sourceRepository.activeMusicSource() ?: throw NoServerException()
+                Log.i("sync", "started (source ${source.id})")
                 serverActions.flush()
-                SyncService(db, source).sync()
+                val summary = SyncService(db, source).sync()
+                Log.i(
+                    "sync",
+                    "finished in ${elapsedMs(startedAt)}ms: " +
+                        "${summary.artists} artists, ${summary.albums} albums, ${summary.songs} songs, " +
+                        "${summary.playlists} playlists, ${summary.playlistSongs} playlist tracks, ${summary.pruned} pruned",
+                )
                 SyncStatus.Success
             } catch (cancellation: CancellationException) {
                 throw cancellation
             } catch (failure: Exception) {
-                Log.w(TAG, "Sync failed", failure)
+                Log.w("sync", "failed after ${elapsedMs(startedAt)}ms", failure)
                 val message =
                     when (failure) {
                         is NoServerException -> {
@@ -87,9 +95,7 @@ class SyncManager(
         _status.value = result
     }
 
-    private companion object {
-        const val TAG = "SubtracksSync"
-    }
+    private fun elapsedMs(startNanos: Long): Long = (System.nanoTime() - startNanos) / 1_000_000
 }
 
 private class NoServerException : IllegalStateException()

app/src/main/kotlin/com/subtracks/data/sync/SyncService.kt

@@ -20,13 +20,28 @@ class SyncService(
     private val db: SubtracksDatabase,
     private val source: MusicSource,
 ) {
-    suspend fun sync() {
+    private var artistsSynced = 0
+    private var albumsSynced = 0
+    private var songsSynced = 0
+    private var playlistsSynced = 0
+    private var playlistSongsSynced = 0
+    private var pruned = 0
+
+    suspend fun sync(): SyncSummary {
         syncArtists()
         syncAlbums()
         syncSongs()
         aggregatePlayData()
         syncPlaylists()
         syncPlaylistSongs()
+        return SyncSummary(
+            artists = artistsSynced,
+            albums = albumsSynced,
+            songs = songsSynced,
+            playlists = playlistsSynced,
+            playlistSongs = playlistSongsSynced,
+            pruned = pruned,
+        )
     }
 
     private suspend fun syncArtists() {
@@ -36,8 +51,9 @@ class SyncService(
             if (batch.isEmpty()) return@collect
             write("artists", artistColumns, primaryKey, batch) { it.values() }
             batch.forEach { seen.add(idHash(it.id)) }
+            artistsSynced += batch.size
         }
-        pruneStaleIds(seen, { library.artistIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deleteArtists(source.id, it) })
+        pruned += pruneStaleIds(seen, { library.artistIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deleteArtists(source.id, it) })
     }
 
     private suspend fun syncAlbums() {
@@ -53,11 +69,13 @@ class SyncService(
             writeAlbumsAndDiscs(batch, discs)
             batch.forEach { seenAlbums.add(idHash(it.id)) }
             discs.forEach { seenDiscs.add(discHash(it.albumId, it.disc)) }
+            albumsSynced += batch.size
         }
-        pruneStaleIds(seenAlbums, { library.albumIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deleteAlbums(source.id, it) })
-        pruneStaleDiscs(seenDiscs, { albumId, disc -> library.discKeysAfter(source.id, albumId, disc, PRUNE_PAGE) }) {
-            deleteStaleDiscs(it)
-        }
+        pruned += pruneStaleIds(seenAlbums, { library.albumIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deleteAlbums(source.id, it) })
+        pruned +=
+            pruneStaleDiscs(seenDiscs, { albumId, disc -> library.discKeysAfter(source.id, albumId, disc, PRUNE_PAGE) }) {
+                deleteStaleDiscs(it)
+            }
     }
 
     private suspend fun syncSongs() {
@@ -67,8 +85,9 @@ class SyncService(
             if (batch.isEmpty()) return@collect
             writeSongs(batch)
             batch.forEach { seen.add(idHash(it.id)) }
+            songsSynced += batch.size
         }
-        pruneStaleIds(seen, { library.songIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deleteSongs(source.id, it) })
+        pruned += pruneStaleIds(seen, { library.songIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deleteSongs(source.id, it) })
     }
 
     private suspend fun writeSongs(batch: List<Song>) {
@@ -106,8 +125,9 @@ class SyncService(
             if (batch.isEmpty()) return@collect
             write("playlists", playlistColumns, primaryKey, batch) { it.values() }
             batch.forEach { seen.add(idHash(it.id)) }
+            playlistsSynced += batch.size
         }
-        pruneStaleIds(seen, { library.playlistIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deletePlaylists(source.id, it) })
+        pruned += pruneStaleIds(seen, { library.playlistIdsAfter(source.id, it, PRUNE_PAGE) }, { library.deletePlaylists(source.id, it) })
     }
 
     private suspend fun syncPlaylistSongs() {
@@ -118,6 +138,7 @@ class SyncService(
             if (batch.isEmpty()) return@collect
             write("playlist_songs", playlistSongColumns, playlistSongKey, batch) { it.values() }
             batch.forEach { counts[it.playlistId] = (counts[it.playlistId] ?: 0L) + 1L }
+            playlistSongsSynced += batch.size
         }
         playlistIds.forEach { library.deletePlaylistSongsFrom(source.id, it, counts[it] ?: 0L) }
         library.deleteOrphanPlaylistSongs(source.id)
@@ -173,15 +194,17 @@ class SyncService(
         seen: HashedIds,
         pageOf: suspend (afterId: String) -> List<String>,
         delete: suspend (Collection<String>) -> Unit,
-    ) {
+    ): Int {
         seen.freeze()
         var afterId = ""
+        var pruned = 0
         while (true) {
             val ids = pageOf(afterId)
-            if (ids.isEmpty()) return
+            if (ids.isEmpty()) return pruned
             val stale = ids.filterNot { seen.contains(idHash(it)) }
             stale.chunked(DELETE_CHUNK).forEach { delete(it) }
-            if (ids.size < PRUNE_PAGE) return
+            pruned += stale.size
+            if (ids.size < PRUNE_PAGE) return pruned
             afterId = ids.last()
         }
     }
@@ -190,22 +213,33 @@ class SyncService(
         seen: HashedIds,
         pageOf: suspend (afterAlbumId: String, afterDisc: Long) -> List<DiscKey>,
         delete: suspend (Collection<DiscKey>) -> Unit,
-    ) {
+    ): Int {
         seen.freeze()
         var afterAlbumId = ""
         var afterDisc = 0L
+        var pruned = 0
         while (true) {
             val keys = pageOf(afterAlbumId, afterDisc)
-            if (keys.isEmpty()) return
+            if (keys.isEmpty()) return pruned
             val stale = keys.filterNot { seen.contains(discHash(it.albumId, it.disc)) }
             stale.chunked(DELETE_CHUNK).forEach { delete(it) }
-            if (keys.size < PRUNE_PAGE) return
+            pruned += stale.size
+            if (keys.size < PRUNE_PAGE) return pruned
             afterAlbumId = keys.last().albumId
             afterDisc = keys.last().disc
         }
     }
 }
 
+data class SyncSummary(
+    val artists: Int,
+    val albums: Int,
+    val songs: Int,
+    val playlists: Int,
+    val playlistSongs: Int,
+    val pruned: Int,
+)
+
 private const val DELETE_CHUNK = 500
 private const val PRUNE_PAGE = 500
 private const val INITIAL_HASH_CAPACITY = 256

app/src/main/kotlin/com/subtracks/di/AppModule.kt

@@ -28,6 +28,7 @@ import com.subtracks.data.repo.QueueRepository
 import com.subtracks.data.repo.SourceRepository
 import com.subtracks.data.source.ServerActionSink
 import com.subtracks.data.sync.SyncManager
+import com.subtracks.log.Log
 import com.subtracks.playback.MediaSessionConnection
 import com.subtracks.playback.PlaybackController
 import com.subtracks.playback.PlayerConnection
@@ -48,6 +49,8 @@ import com.subtracks.ui.settings.SettingsViewModel
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import okhttp3.OkHttpClient
 import org.koin.core.module.dsl.viewModel
 import org.koin.core.qualifier.named
@@ -68,6 +71,7 @@ fun appModule(
     single { CoroutineScope(SupervisorJob() + Dispatchers.Default) }
     single(named("io")) { CoroutineScope(SupervisorJob() + Dispatchers.IO) }
     single(named("playback")) { CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate) }
+    single(createdAtStart = true) { get<UserPreferences>().verboseLogging().onEach(Log::setVerbose).launchIn(get()) }
     single {
         SourceRepository(
             get(),

app/src/main/kotlin/com/subtracks/log/Log.kt

@@ -0,0 +1,208 @@
+package com.subtracks.log
+
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import androidx.core.content.FileProvider
+import com.subtracks.BuildConfig
+import com.subtracks.R
+import com.subtracks.data.db.SqlExecution
+import okhttp3.Interceptor
+import java.io.File
+import java.io.IOException
+import kotlin.math.roundToLong
+import android.util.Log as AndroidLog
+
+object Log {
+    private const val SLOW_QUERY_MS = 100.0
+    private const val MAX_SQL_CHARS = 500
+    private val WHITESPACE = Regex("\\s+")
+
+    private var fileStore: LogFileStore? = null
+    private var appContext: Context? = null
+    private var consoleLevel = LogLevel.DEBUG
+    private var defaultFileLevel = LogLevel.INFO
+    private var crashHandlerInstalled = false
+
+    fun init(context: Context) {
+        val app = context.applicationContext
+        appContext = app
+        consoleLevel = if (BuildConfig.DEBUG) LogLevel.VERBOSE else LogLevel.INFO
+        defaultFileLevel = if (BuildConfig.DEBUG) LogLevel.DEBUG else LogLevel.INFO
+        fileStore?.shutdown()
+        fileStore = LogFileStore(File(app.filesDir, "logs"), defaultFileLevel)
+        installCrashHandler()
+        i("app", "started ${BuildConfig.VERSION_NAME} (${BuildConfig.VERSION_CODE}) on Android ${Build.VERSION.SDK_INT} ${Build.MODEL}")
+    }
+
+    fun setVerbose(enabled: Boolean) {
+        fileStore?.setMinLevel(if (enabled) LogLevel.VERBOSE else defaultFileLevel)
+    }
+
+    fun v(
+        tag: String,
+        message: String,
+    ) = log(LogLevel.VERBOSE, tag, message, null)
+
+    fun d(
+        tag: String,
+        message: String,
+    ) = log(LogLevel.DEBUG, tag, message, null)
+
+    fun i(
+        tag: String,
+        message: String,
+    ) = log(LogLevel.INFO, tag, message, null)
+
+    fun w(
+        tag: String,
+        message: String,
+        throwable: Throwable? = null,
+    ) = log(LogLevel.WARN, tag, message, throwable)
+
+    fun e(
+        tag: String,
+        message: String,
+        throwable: Throwable? = null,
+    ) = log(LogLevel.ERROR, tag, message, throwable)
+
+    fun exportZip(): File? {
+        val store = fileStore ?: return null
+        val context = appContext ?: return null
+        store.flush()
+        return store.exportZip(File(context.cacheDir, "log_dumps"))
+    }
+
+    fun share(
+        context: Context,
+        file: File,
+    ) {
+        val uri = FileProvider.getUriForFile(context, "${context.packageName}.fileprovider", file)
+        val send =
+            Intent(Intent.ACTION_SEND).apply {
+                type = "application/zip"
+                putExtra(Intent.EXTRA_STREAM, uri)
+                putExtra(Intent.EXTRA_SUBJECT, context.getString(R.string.settings_about_share_logs_subject))
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            }
+        context.startActivity(
+            Intent.createChooser(send, context.getString(R.string.settings_about_actions_share_logs)),
+        )
+    }
+
+    fun interceptor(): Interceptor =
+        Interceptor { chain ->
+            val request = chain.request()
+            v("http", "${request.method} ${request.url}")
+            try {
+                val response = chain.proceed(request)
+                if (response.code >= 400) {
+                    w("http", "${request.method} ${request.url} -> ${response.code}")
+                }
+                response
+            } catch (failure: IOException) {
+                if (chain.call().isCanceled()) {
+                    v("http", "${request.method} ${request.url} cancelled")
+                } else {
+                    w("http", "${request.method} ${request.url} failed", failure)
+                }
+                throw failure
+            }
+        }
+
+    fun sql(execution: SqlExecution) {
+        val failure = execution.error
+        if (failure != null) {
+            if (isUpsertConflict(execution.sql, failure)) {
+                v("sql", "upsert fallback conflict: ${shortSql(execution.sql)}")
+            } else {
+                e("sql", "failed: ${shortSql(execution.sql)}", failure)
+            }
+            return
+        }
+        if (!isSlowQuery(execution, SLOW_QUERY_MS)) return
+        val rows = if (isReadStatement(execution.sql)) " rows=${execution.rows}" else ""
+        w("sql", "slow ${execution.durationMillis.roundToLong()}ms$rows: ${shortSql(execution.sql)}")
+    }
+
+    private fun log(
+        level: LogLevel,
+        tag: String,
+        message: String,
+        throwable: Throwable?,
+    ) {
+        val toConsole = level.ordinal >= consoleLevel.ordinal
+        val store = fileStore
+        if (!toConsole && store?.willLog(level) != true) return
+        val redacted = redactLogs(message)
+        if (toConsole) {
+            // Logging is best effort: a logcat write must never disturb the caller.
+            runCatching {
+                val text =
+                    if (throwable != null) {
+                        "$redacted\n${redactLogs(AndroidLog.getStackTraceString(throwable))}"
+                    } else {
+                        redacted
+                    }
+                AndroidLog.println(priority(level), tag.take(23), text)
+            }
+        }
+        store?.write(level, tag, redacted, throwable)
+    }
+
+    private fun priority(level: LogLevel): Int =
+        when (level) {
+            LogLevel.VERBOSE -> AndroidLog.VERBOSE
+            LogLevel.DEBUG -> AndroidLog.DEBUG
+            LogLevel.INFO -> AndroidLog.INFO
+            LogLevel.WARN -> AndroidLog.WARN
+            LogLevel.ERROR -> AndroidLog.ERROR
+        }
+
+    private fun installCrashHandler() {
+        if (crashHandlerInstalled) return
+        crashHandlerInstalled = true
+        val previous = Thread.getDefaultUncaughtExceptionHandler()
+        Thread.setDefaultUncaughtExceptionHandler { thread, throwable ->
+            runCatching {
+                fileStore?.writeImmediately(LogLevel.ERROR, "crash", "uncaught exception on ${thread.name}", throwable)
+            }
+            previous?.uncaughtException(thread, throwable)
+        }
+    }
+
+    private fun shortSql(sql: String): String = sql.replace(WHITESPACE, " ").take(MAX_SQL_CHARS)
+}
+
+private val DATA_KEYWORDS = setOf("SELECT", "INSERT", "UPDATE", "DELETE", "WITH", "REPLACE")
+private val READ_KEYWORDS = setOf("SELECT", "WITH")
+private const val SQL_INTERNAL = "room_table_modification_log"
+
+internal fun isDataStatement(sql: String): Boolean {
+    val normalized = sql.trimStart()
+    if (normalized.contains(SQL_INTERNAL)) return false
+    return normalized.takeWhile { !it.isWhitespace() }.uppercase() in DATA_KEYWORDS
+}
+
+internal fun isReadStatement(sql: String): Boolean = sql.trimStart().takeWhile { !it.isWhitespace() }.uppercase() in READ_KEYWORDS
+
+internal fun isSlowQuery(
+    execution: SqlExecution,
+    thresholdMs: Double,
+): Boolean = execution.error == null && execution.durationMillis >= thresholdMs && isDataStatement(execution.sql)
+
+// Room's EntityUpsertAdapter implements @Upsert as an INSERT and treats a uniqueness conflict as the
+// signal to UPDATE instead (EntityUpsertAdapter.checkUniquenessException). Only downgrade a failed
+// INSERT whose error says the conflict was a unique/primary key; anything else stays an ERROR so a
+// genuine failure isn't hidden in release.
+private const val CONSTRAINT_UNIQUE_MESSAGE = "unique constraint failed"
+private const val CONSTRAINT_PRIMARY_KEY_MESSAGE = "primary key constraint failed"
+
+internal fun isUpsertConflict(
+    sql: String,
+    error: Throwable,
+): Boolean {
+    if (!sql.trimStart().uppercase().startsWith("INSERT")) return false
+    val message = error.message?.lowercase() ?: return false
+    return message.contains(CONSTRAINT_UNIQUE_MESSAGE) || message.contains(CONSTRAINT_PRIMARY_KEY_MESSAGE)
+}

app/src/main/kotlin/com/subtracks/log/LogFileStore.kt

@@ -0,0 +1,177 @@
+package com.subtracks.log
+
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import java.util.concurrent.Executors
+import java.util.concurrent.atomic.AtomicInteger
+import java.util.zip.ZipEntry
+import java.util.zip.ZipOutputStream
+
+enum class LogLevel { VERBOSE, DEBUG, INFO, WARN, ERROR }
+
+class LogFileStore(
+    private val rootDir: File,
+    @Volatile private var minLevel: LogLevel,
+    private val maxFileBytes: Long = DEFAULT_MAX_FILE_BYTES,
+    private val maxFiles: Int = DEFAULT_MAX_FILES,
+) {
+    private val executor =
+        Executors.newSingleThreadExecutor { runnable ->
+            Thread(runnable, "log-writer").apply { isDaemon = true }
+        }
+    private val lock = Any()
+    private val pending = AtomicInteger()
+    private val dateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.US)
+    private val lineFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", Locale.US)
+    private var current = currentFile()
+
+    init {
+        // Log.init runs in Application.onCreate, so clean up leftovers on the writer thread.
+        runCatching { executor.execute { synchronized(lock) { prune() } } }
+    }
+
+    fun willLog(level: LogLevel): Boolean = level.ordinal >= minLevel.ordinal
+
+    fun write(
+        level: LogLevel,
+        tag: String,
+        message: String,
+        throwable: Throwable?,
+    ) {
+        if (level.ordinal < minLevel.ordinal) return
+        // Drop under pressure rather than grow the queue without bound (verbose logs every request).
+        if (pending.get() >= MAX_PENDING) return
+        pending.incrementAndGet()
+        runCatching {
+            executor.execute {
+                try {
+                    synchronized(lock) { append(level, tag, message, throwable) }
+                } finally {
+                    pending.decrementAndGet()
+                }
+            }
+        }.onFailure { pending.decrementAndGet() }
+    }
+
+    fun writeImmediately(
+        level: LogLevel,
+        tag: String,
+        message: String,
+        throwable: Throwable?,
+    ) {
+        if (level.ordinal < minLevel.ordinal) return
+        runCatching { synchronized(lock) { append(level, tag, message, throwable) } }
+    }
+
+    fun flush() {
+        runCatching { executor.submit {}.get() }
+    }
+
+    fun setMinLevel(level: LogLevel) {
+        minLevel = level
+    }
+
+    fun shutdown() {
+        executor.shutdownNow()
+    }
+
+    fun files(): List<File> =
+        rootDir
+            .listFiles { file -> file.isFile && file.name.endsWith(LOG_SUFFIX) }
+            ?.sortedByDescending { it.lastModified() }
+            .orEmpty()
+
+    fun exportZip(destDir: File): File? =
+        synchronized(lock) {
+            val logs = files()
+            if (logs.isEmpty()) return null
+            destDir.mkdirs()
+            destDir.listFiles()?.forEach { if (it.isFile) it.delete() }
+            val zip = File(destDir, "subtracks-logs-${System.currentTimeMillis()}.zip")
+            ZipOutputStream(zip.outputStream().buffered()).use { out ->
+                logs.forEach { log ->
+                    if (!log.isFile) return@forEach
+                    out.putNextEntry(ZipEntry(log.name))
+                    log.inputStream().use { it.copyTo(out) }
+                    out.closeEntry()
+                }
+            }
+            zip
+        }
+
+    private fun append(
+        level: LogLevel,
+        tag: String,
+        message: String,
+        throwable: Throwable?,
+    ) {
+        val text =
+            buildString {
+                append(lineFormat.format(Date()))
+                append(' ')
+                append(LEVEL_CHARS[level.ordinal])
+                append(' ')
+                append(tag)
+                append(' ')
+                append(message)
+                throwable?.let {
+                    append('\n')
+                    append(it.stackTraceToString().trimEnd())
+                }
+                append('\n')
+            }
+        rootDir.mkdirs()
+        var rolled = false
+        val today = currentFile()
+        if (current.name != today.name) {
+            current = today
+            rolled = true
+        }
+        if (current.length() >= maxFileBytes) {
+            roll()
+            rolled = true
+        }
+        current.appendText(redactLogs(text))
+        if (rolled) prune()
+    }
+
+    private var rollSequence = 0
+
+    private fun roll() {
+        if (current.exists()) {
+            current.renameTo(uniqueRolledFile())
+        }
+        current = currentFile()
+    }
+
+    private fun uniqueRolledFile(): File {
+        val day = dateFormat.format(Date())
+        while (true) {
+            val candidate = File(rootDir, "$day-${rollSequence++}$LOG_SUFFIX")
+            if (!candidate.exists()) return candidate
+        }
+    }
+
+    private fun prune() {
+        // Never prune the file we are writing to, and never keep fewer than one rolled file slot.
+        val rolled = files().filterNot { it == current }
+        if (rolled.size > maxFiles - 1) rolled.drop(maxFiles - 1).forEach { it.delete() }
+    }
+
+    private fun currentFile(): File = File(rootDir, dateFormat.format(Date()) + LOG_SUFFIX)
+
+    companion object {
+        const val DEFAULT_MAX_FILE_BYTES = 1L * 1024 * 1024
+        const val DEFAULT_MAX_FILES = 7
+        private const val MAX_PENDING = 4096
+        private const val LOG_SUFFIX = ".log"
+        private val LEVEL_CHARS = charArrayOf('V', 'D', 'I', 'W', 'E')
+    }
+}
+
+private val URL_USERINFO = Regex("([a-zA-Z][a-zA-Z0-9+.\\-]*://)[^/@\\s]+@")
+private val URL_PARAM = Regex("([?&](?:u|p|s|t)=)[^&\\s]+")
+
+internal fun redactLogs(input: String): String = input.replace(URL_USERINFO, "$1REDACTED@").replace(URL_PARAM, "$1REDACTED")

app/src/main/kotlin/com/subtracks/playback/Media3PlayerHandle.kt

@@ -1,7 +1,6 @@
 package com.subtracks.playback
 
 import android.os.Bundle
-import android.util.Log
 import androidx.media3.common.C
 import androidx.media3.common.Format
 import androidx.media3.common.MediaItem
@@ -16,6 +15,7 @@ import com.subtracks.UiMessage
 import com.subtracks.data.model.AudioEncoding
 import com.subtracks.data.repo.DownloadRepository
 import com.subtracks.data.repo.SourceRepository
+import com.subtracks.log.Log
 
 class Media3PlayerHandle(
     private val controller: MediaController,
@@ -112,14 +112,19 @@ class Media3PlayerHandle(
     ) = controller.replaceMediaItem(index, toMediaItem(item))
 
     override fun seekToIndex(index: Int) {
-        Log.d(TAG, "seekToIndex($index) playerDuration=${controller.duration} state=${controller.playbackState}")
+        Log.d(
+            "playback",
+            "seekToIndex($index) position=${controller.currentPosition} duration=${duration(
+                controller.duration,
+            )} state=${controller.playbackState}",
+        )
         controller.seekTo(index, 0)
     }
 
     override fun seekTo(positionMs: Long) {
         Log.d(
-            TAG,
-            "seekTo(${positionMs}ms) from=${controller.currentPosition} playerDuration=${controller.duration} " +
+            "playback",
+            "seekTo(${positionMs}ms) from=${controller.currentPosition} duration=${duration(controller.duration)} " +
                 "itemDuration=${currentItem?.durationMs} state=${controller.playbackState}",
         )
         controller.seekTo(positionMs)
@@ -136,7 +141,7 @@ class Media3PlayerHandle(
                     mediaItem: MediaItem?,
                     reason: Int,
                 ) {
-                    Log.d(TAG, "item=${mediaItem?.mediaId}")
+                    Log.i("playback", "${describe(mediaItem)} transition=${transitionReason(reason)}")
                     listener.onTransition()
                 }
 
@@ -147,8 +152,9 @@ class Media3PlayerHandle(
 
                 override fun onPlayerError(error: PlaybackException) {
                     Log.w(
-                        TAG,
-                        "Playback error ${error.errorCodeName} at ${controller.currentPosition}/${controller.duration}",
+                        "playback",
+                        "error ${error.errorCodeName} ${describe(controller.currentMediaItem)} " +
+                            "position=${controller.currentPosition} duration=${duration(controller.duration)}",
                         error,
                     )
                     listener.onError(playbackErrorMessage(error))
@@ -156,15 +162,54 @@ class Media3PlayerHandle(
 
                 override fun onPlaybackStateChanged(playbackState: Int) {
                     Log.d(
-                        TAG,
+                        "playback",
                         "state=$playbackState position=${controller.currentPosition} " +
-                            "playerDuration=${controller.duration} itemDuration=${currentItem?.durationMs}",
+                            "duration=${duration(controller.duration)} itemDuration=${currentItem?.durationMs}",
                     )
+                    if (playbackState == Player.STATE_ENDED) {
+                        Log.i("playback", "ended ${describe(controller.currentMediaItem)}")
+                    }
                 }
             },
         )
     }
 
+    private fun describe(mediaItem: MediaItem?): String {
+        if (mediaItem == null) return "item=none"
+        val metadata = mediaItem.mediaMetadata
+        val artist =
+            metadata.artist
+                ?.toString()
+                ?.takeIf { it.isNotBlank() }
+                ?.let { " artist=\"$it\"" }
+                .orEmpty()
+        val album =
+            metadata.albumTitle
+                ?.toString()
+                ?.takeIf { it.isNotBlank() }
+                ?.let { " album=\"$it\"" }
+                .orEmpty()
+        val source =
+            when (mediaItem.localConfiguration?.uri?.scheme) {
+                "file", "content" -> "file"
+                "http", "https" -> "http"
+                null -> "none"
+                else -> "other"
+            }
+        return "item id=${mediaItem.mediaId} title=\"${metadata.title?.toString().orEmpty()}\"$artist$album source=$source"
+    }
+
+    private fun duration(value: Long): String = if (value == C.TIME_UNSET) "unset" else "${value}ms"
+
+    private fun transitionReason(reason: Int): String =
+        when (reason) {
+            Player.MEDIA_ITEM_TRANSITION_REASON_REPEAT -> "repeat"
+            Player.MEDIA_ITEM_TRANSITION_REASON_AUTO -> "auto"
+            Player.MEDIA_ITEM_TRANSITION_REASON_SEEK -> "seek"
+            Player.MEDIA_ITEM_TRANSITION_REASON_PLAYLIST_CHANGED -> "playlist"
+            else -> reason.toString()
+        }
+
     private fun toMediaItem(item: QueueItem): MediaItem {
         val quality = sourceRepository.quality.value
         return queueMediaItem(
@@ -190,10 +235,6 @@ class Media3PlayerHandle(
                     ?.takeIf { it.containsKey(EXTRA_DURATION_MS) }
                     ?.getLong(EXTRA_DURATION_MS),
         )
-
-    private companion object {
-        const val TAG = "SubtracksPlayback"
-    }
 }
 
 private const val EXTRA_COVER_ART_ID = "coverArtId"

app/src/main/kotlin/com/subtracks/playback/PlaybackController.kt

@@ -11,6 +11,7 @@ import com.subtracks.data.repo.QueueSnapshot
 import com.subtracks.data.repo.QueueWindowItem
 import com.subtracks.data.repo.Shuffle
 import com.subtracks.data.repo.SourceRepository
+import com.subtracks.log.Log
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -127,7 +128,9 @@ class PlaybackController(
     private var positionJob: Job? = null
     private var windowJob: Job? = null
     private var bufferingJob: Job? = null
+    private var stallJob: Job? = null
     private var showBuffering = false
+    private var stalled = false
     private val startLock = Mutex()
 
     private var snapshot: QueueSnapshot? = null
@@ -1047,6 +1050,9 @@ class PlaybackController(
         windowJob?.cancel()
         bufferingJob?.cancel()
         bufferingJob = null
+        stallJob?.cancel()
+        stallJob = null
+        stalled = false
         showBuffering = false
         snapshot = null
         queueSourceId = null
@@ -1460,21 +1466,42 @@ class PlaybackController(
     suspend fun sourceTitle(context: QueueContext?): String? = context?.let { queueRepository.sourceName(it.kind, it.sourceId, it.refId) }
 
     private fun updateBuffering() {
+        val player = player
         if (player?.isBuffering != true) {
             bufferingJob?.cancel()
             bufferingJob = null
+            stallJob?.cancel()
+            stallJob = null
+            stalled = false
             showBuffering = false
             return
         }
-        if (showBuffering || bufferingJob?.isActive == true) return
-        bufferingJob =
-            scope.launch {
-                delay(BUFFERING_INDICATOR_DELAY_MS)
-                if (player?.isBuffering == true) {
-                    showBuffering = true
-                    refresh()
+        if (!showBuffering && bufferingJob?.isActive != true) {
+            bufferingJob =
+                scope.launch {
+                    delay(BUFFERING_INDICATOR_DELAY_MS)
+                    if (player.isBuffering) {
+                        showBuffering = true
+                        refresh()
+                    }
                 }
-            }
+        }
+        // A stall is buffering that persists long enough to be a real problem, not a track change.
+        if (stallJob?.isActive != true && !stalled) {
+            stallJob =
+                scope.launch {
+                    delay(STALL_WATCHDOG_MS)
+                    if (player === this@PlaybackController.player && player.isBuffering && player.playWhenReady) {
+                        stalled = true
+                        val item = player.currentItem
+                        Log.w(
+                            "playback",
+                            "stalled: buffering for ${STALL_WATCHDOG_MS / 1000}s at ${player.currentPositionMs}ms " +
+                                "item id=${item?.id} title=\"${item?.title}\"",
+                        )
+                    }
+                }
+        }
     }
 
     private fun refresh(position: Long? = currentPosition()) {
@@ -1541,6 +1568,7 @@ class PlaybackController(
         const val POSITION_TICK_MS = 500L
         const val POSITION_SAVE_INTERVAL_MS = 15_000L
         const val BUFFERING_INDICATOR_DELAY_MS = 1_000L
+        const val STALL_WATCHDOG_MS = 15_000L
         const val QUEUE_WINDOW_RADIUS = 25L
         const val WINDOW_SHIFT_DELAY_MS = 400L
         const val RESTART_THRESHOLD_MS = 3_000L

app/src/main/kotlin/com/subtracks/playback/PlaybackService.kt

@@ -5,7 +5,6 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.os.SystemClock
-import android.util.Log
 import androidx.annotation.OptIn
 import androidx.media3.common.AudioAttributes
 import androidx.media3.common.C
@@ -29,9 +28,11 @@ import com.google.common.util.concurrent.Futures
 import com.google.common.util.concurrent.ListenableFuture
 import com.subtracks.MainActivity
 import com.subtracks.R
+import com.subtracks.UserAgent
 import com.subtracks.data.repo.LibraryRepository
 import com.subtracks.data.repo.SourceRepository
 import com.subtracks.data.source.StarType
+import com.subtracks.log.Log
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
@@ -104,7 +105,9 @@ class PlaybackService : MediaSessionService() {
                 .setMediaSourceFactory(
                     DefaultMediaSourceFactory(this)
                         .setEnableClippingInMediaPeriod(true)
-                        .setDataSourceFactory(mediaDataSourceFactory(this, OkHttpDataSource.Factory(streamingClient()))),
+                        .setDataSourceFactory(
+                            mediaDataSourceFactory(this, OkHttpDataSource.Factory(streamingClient()).setUserAgent(UserAgent.value)),
+                        ),
                 ).build()
         exoPlayer.addListener(
             object : Player.Listener {
@@ -183,12 +186,13 @@ class PlaybackService : MediaSessionService() {
     private fun streamingClient(): OkHttpClient =
         OkHttpClient
             .Builder()
+            .addInterceptor(Log.interceptor())
             .addInterceptor { chain ->
                 val started = SystemClock.elapsedRealtime()
                 val response = chain.proceed(chain.request())
                 Log.d(
-                    STREAM_TAG,
-                    "stream range=${chain.request().header("Range")} code=${response.code} " +
+                    "stream",
+                    "range=${chain.request().header("Range")} code=${response.code} " +
                         "contentRange=${response.header("Content-Range")} " +
                         "length=${response.body.contentLength()} in ${SystemClock.elapsedRealtime() - started}ms",
                 )
@@ -208,7 +212,6 @@ class PlaybackService : MediaSessionService() {
     }
 
     private companion object {
-        const val STREAM_TAG = "SubtracksPlayback"
         val STAR_COMMAND = SessionCommand("com.subtracks.STAR", Bundle.EMPTY)
     }
 }

app/src/main/kotlin/com/subtracks/playback/Scrobbler.kt

@@ -1,6 +1,7 @@
 package com.subtracks.playback
 
 import com.subtracks.data.source.ServerActionSink
+import com.subtracks.log.Log
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -128,22 +129,28 @@ class Scrobbler(
     private suspend fun submit(event: Scrobble) {
         when (event) {
             is Scrobble.NowPlaying -> {
-                attempt { sink.nowPlaying(event.songId) }
+                Log.i("scrobble", "now playing ${event.songId}")
+                attempt("now playing ${event.songId}") { sink.nowPlaying(event.songId) }
             }
 
             is Scrobble.Submission -> {
-                attempt { recordPlay(event.songId, event.time / 1000) }
-                attempt { sink.scrobble(event.songId, event.time) }
+                Log.i("scrobble", "submitting ${event.songId}")
+                attempt("record play ${event.songId}") { recordPlay(event.songId, event.time / 1000) }
+                attempt("scrobble ${event.songId}") { sink.scrobble(event.songId, event.time) }
             }
         }
     }
 
-    private suspend fun attempt(block: suspend () -> Unit) {
+    private suspend fun attempt(
+        label: String,
+        block: suspend () -> Unit,
+    ) {
         try {
             block()
         } catch (cancellation: CancellationException) {
             throw cancellation
-        } catch (_: Exception) {
+        } catch (failure: Exception) {
+            Log.w("scrobble", "$label failed", failure)
         }
     }
 }

app/src/main/kotlin/com/subtracks/ui/components/Components.kt

@@ -87,9 +87,11 @@ fun CoverArt(
     colorFilter: ColorFilter? = null,
 ) {
     val context = LocalPlatformContext.current
-    var failed by remember(ref, thumbnailRef) { mutableStateOf(false) }
-    var thumbnailLoaded by remember(ref, thumbnailRef) { mutableStateOf(false) }
-    var thumbnailRatio by remember(ref, thumbnailRef) { mutableStateOf(thumbnailRef?.cacheKey?.let(ArtworkRatioCache::get)) }
+    val refKey = ref?.cacheKey
+    val thumbnailKey = thumbnailRef?.cacheKey
+    var failed by remember(refKey, thumbnailKey) { mutableStateOf(false) }
+    var thumbnailLoaded by remember(refKey, thumbnailKey) { mutableStateOf(false) }
+    var thumbnailRatio by remember(refKey, thumbnailKey) { mutableStateOf(thumbnailKey?.let(ArtworkRatioCache::get)) }
     val letterScheme =
         if (showPlaceholder || (failed && !thumbnailLoaded)) {
             remember(name) { artworkColorsFromSeed(placeholderSeed(name)).scheme }
@@ -102,7 +104,7 @@ fun CoverArt(
             .background(letterScheme?.primaryContainer ?: MaterialTheme.colorScheme.surfaceVariant)
 
     if (square) {
-        val model = remember(ref, thumbnailRef) { ref?.let { imageRequest(context, it, crossfade = true) } }
+        val model = remember(refKey, thumbnailKey) { ref?.let { imageRequest(context, it, crossfade = true) } }
         Box(modifier.then(frameModifier)) {
             CoverArtContent(
                 ref = ref,
@@ -147,7 +149,7 @@ fun CoverArt(
             val painter =
                 rememberAsyncImagePainter(
                     model =
-                        remember(ref, thumbnailRef, target) {
+                        remember(refKey, thumbnailKey, target) {
                             ref?.let {
                                 imageRequest(
                                     context,
@@ -231,7 +233,7 @@ private fun BoxScope.CoverArtContent(
     }
     if (thumbnailRef != null && thumbnailRef != ref) {
         AsyncImage(
-            model = remember(thumbnailRef) { imageRequest(context, thumbnailRef, crossfade = false) },
+            model = remember(thumbnailRef.cacheKey) { imageRequest(context, thumbnailRef, crossfade = false) },
             contentDescription = null,
             contentScale = contentScale,
             colorFilter = colorFilter,

app/src/main/kotlin/com/subtracks/ui/settings/SettingsScreen.kt

@@ -1,6 +1,7 @@
 package com.subtracks.ui.settings
 
 import android.content.res.Resources
+import android.widget.Toast
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
@@ -27,6 +28,7 @@ import androidx.compose.material.icons.rounded.Edit
 import androidx.compose.material.icons.rounded.Favorite
 import androidx.compose.material.icons.rounded.Info
 import androidx.compose.material.icons.rounded.Language
+import androidx.compose.material.icons.rounded.Share
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Button
 import androidx.compose.material3.ExperimentalMaterial3Api
@@ -47,11 +49,13 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalResources
 import androidx.compose.ui.platform.LocalUriHandler
 import androidx.compose.ui.res.stringResource
@@ -62,10 +66,14 @@ import com.subtracks.BuildConfig
 import com.subtracks.R
 import com.subtracks.data.model.Source
 import com.subtracks.data.prefs.StreamQuality
+import com.subtracks.log.Log
 import com.subtracks.ui.components.DismissOnRequest
 import com.subtracks.ui.components.rememberViewportFill
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.emptyFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.koin.compose.viewmodel.koinViewModel
 
 private val bitrateOptions = listOf(0, 24, 32, 64, 96, 128, 192, 256, 320)
@@ -95,6 +103,9 @@ fun SettingsRoute(
     val downloadOverMetered by viewModel.downloadOverMetered.collectAsStateWithLifecycle()
     val scrobbling by viewModel.scrobbling.collectAsStateWithLifecycle()
     val offline by viewModel.offline.collectAsStateWithLifecycle()
+    val verboseLogging by viewModel.verboseLogging.collectAsStateWithLifecycle()
+    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
     SettingsScreen(
         sources = sources,
         activeSourceId = activeSourceId,
@@ -105,6 +116,7 @@ fun SettingsRoute(
         downloadOverMetered = downloadOverMetered,
         scrobbling = scrobbling,
         offline = offline,
+        verboseLogging = verboseLogging,
         onSelectSource = viewModel::selectSource,
         onEditServer = onEditServer,
         onWifiQualityChange = viewModel::setWifiQuality,
@@ -114,9 +126,27 @@ fun SettingsRoute(
         onDownloadOverMeteredChange = viewModel::setDownloadOverMetered,
         onScrobblingChange = viewModel::setScrobbling,
         onOfflineChange = viewModel::setOfflineMode,
+        onVerboseLoggingChange = viewModel::setVerboseLogging,
         onAddServer = onAddServer,
         onOpenDownloads = onOpenDownloads,
         onOpenLicenses = onOpenLicenses,
+        onShareLogs = {
+            scope.launch {
+                val result =
+                    runCatching {
+                        val zip = withContext(Dispatchers.IO) { Log.exportZip() }
+                        if (zip != null) Log.share(context, zip)
+                        zip
+                    }
+                val message =
+                    when {
+                        result.isFailure -> R.string.settings_about_share_logs_failed
+                        result.getOrNull() == null -> R.string.settings_about_share_logs_empty
+                        else -> null
+                    }
+                message?.let { Toast.makeText(context, it, Toast.LENGTH_SHORT).show() }
+            }
+        },
         onBack = onBack,
         dismissals = dismissals,
     )
@@ -135,6 +165,7 @@ fun SettingsScreen(
     scrobbling: Boolean,
     modifier: Modifier = Modifier,
     offline: Boolean = false,
+    verboseLogging: Boolean = false,
     onSelectSource: (Long) -> Unit,
     onEditServer: (Long) -> Unit,
     onWifiQualityChange: (StreamQuality) -> Unit,
@@ -144,9 +175,11 @@ fun SettingsScreen(
     onDownloadOverMeteredChange: (Boolean) -> Unit,
     onScrobblingChange: (Boolean) -> Unit,
     onOfflineChange: (Boolean) -> Unit = {},
+    onVerboseLoggingChange: (Boolean) -> Unit = {},
     onAddServer: () -> Unit,
     onOpenDownloads: () -> Unit,
     onOpenLicenses: () -> Unit,
+    onShareLogs: () -> Unit,
     onBack: () -> Unit,
     dismissals: Flow<Unit> = emptyFlow(),
 ) {
@@ -321,6 +354,35 @@ fun SettingsScreen(
                     colors = ListItemDefaults.colors(containerColor = Color.Transparent),
                 )
             }
+            item { SectionHeader(stringResource(R.string.settings_troubleshooting_name)) }
+            item {
+                ListItem(
+                    headlineContent = { Text(stringResource(R.string.settings_about_actions_share_logs)) },
+                    leadingContent = { Icon(Icons.Rounded.Share, contentDescription = null) },
+                    modifier = Modifier.clickable(onClick = onShareLogs),
+                    colors = ListItemDefaults.colors(containerColor = Color.Transparent),
+                )
+            }
+            item {
+                ListItem(
+                    headlineContent = { Text(stringResource(R.string.settings_about_verbose_logging)) },
+                    supportingContent = { Text(stringResource(R.string.settings_about_verbose_logging_description)) },
+                    trailingContent = {
+                        Switch(
+                            checked = verboseLogging,
+                            onCheckedChange = onVerboseLoggingChange,
+                            colors =
+                                SwitchDefaults.colors(
+                                    uncheckedThumbColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                                    uncheckedTrackColor = MaterialTheme.colorScheme.surfaceVariant,
+                                    uncheckedBorderColor = MaterialTheme.colorScheme.outline,
+                                ),
+                        )
+                    },
+                    modifier = Modifier.clickable { onVerboseLoggingChange(!verboseLogging) },
+                    colors = ListItemDefaults.colors(containerColor = Color.Transparent),
+                )
+            }
             item { SectionHeader(stringResource(R.string.settings_about_name)) }
             item {
                 ListItem(

app/src/main/kotlin/com/subtracks/ui/settings/SettingsViewModel.kt

@@ -55,10 +55,19 @@ class SettingsViewModel(
 
     val offline: StateFlow<Boolean> = sourceRepository.offline
 
+    val verboseLogging: StateFlow<Boolean> =
+        userPreferences
+            .verboseLogging()
+            .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), false)
+
     fun setOfflineMode(enabled: Boolean) {
         sourceRepository.setOfflineMode(enabled)
     }
 
+    fun setVerboseLogging(enabled: Boolean) {
+        viewModelScope.launch { userPreferences.setVerboseLogging(enabled) }
+    }
+
     fun selectSource(id: Long) {
         viewModelScope.launch { sourceRepository.selectSource(id) }
     }

app/src/main/res/values-b+pt+BR/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Pesquisar</string>
     <string name="settings_about_actions_licenses">Licenças</string>
     <string name="settings_about_actions_project_homepage">Página do projeto</string>
+    <string name="settings_about_actions_share_logs">Compartilhar logs</string>
     <string name="settings_about_actions_support">Apoie o desenvolvedor</string>
     <string name="settings_about_name">Sobre</string>
     <string name="settings_about_version">Versão %1$s</string>

app/src/main/res/values-b+zh+Hans/strings.xml

@@ -28,6 +28,7 @@
     <string name="search_input_placeholder">搜索</string>
     <string name="settings_about_actions_licenses">许可</string>
     <string name="settings_about_actions_project_homepage">项目地址</string>
+    <string name="settings_about_actions_share_logs">分享日志</string>
     <string name="settings_about_actions_support">支持开发者</string>
     <string name="settings_about_name">关于</string>
     <string name="settings_about_version">版本 %1$s</string>

app/src/main/res/values-b+zh+Hant/strings.xml

@@ -28,6 +28,7 @@
     <string name="search_input_placeholder">搜尋</string>
     <string name="settings_about_actions_licenses">許可</string>
     <string name="settings_about_actions_project_homepage">專案首頁</string>
+    <string name="settings_about_actions_share_logs">分享日誌</string>
     <string name="settings_about_actions_support">支援開發者</string>
     <string name="settings_about_name">關於</string>
     <string name="settings_about_version">版本 %1$s</string>

app/src/main/res/values-de/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Suche</string>
     <string name="settings_about_actions_licenses">Lizenzen</string>
     <string name="settings_about_actions_project_homepage">Projektseite</string>
+    <string name="settings_about_actions_share_logs">Protokolle teilen</string>
     <string name="settings_about_actions_support">Den Entwickler unterstützen</string>
     <string name="settings_about_name">Über</string>
     <string name="settings_about_version">Version %1$s</string>

app/src/main/res/values-es/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Buscar</string>
     <string name="settings_about_actions_licenses">Licencias</string>
     <string name="settings_about_actions_project_homepage">Página de inicio del proyecto</string>
+    <string name="settings_about_actions_share_logs">Compartir registros</string>
     <string name="settings_about_actions_support">Apoya al desarrollador</string>
     <string name="settings_about_name">Información</string>
     <string name="settings_about_version">versión %1$s</string>

app/src/main/res/values-eu/strings.xml

@@ -29,6 +29,7 @@
     <string name="search_input_placeholder">Bilatu</string>
     <string name="settings_about_actions_licenses">Lizentziak</string>
     <string name="settings_about_actions_project_homepage">Proiektuaren webgunea</string>
+    <string name="settings_about_actions_share_logs">Partekatu erregistroak</string>
     <string name="settings_about_actions_support">Lagundu garatzaileari</string>
     <string name="settings_about_name">Honi buruz</string>
     <string name="settings_about_version">%1$s bertsioa</string>

app/src/main/res/values-fr/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Recherche</string>
     <string name="settings_about_actions_licenses">Licences</string>
     <string name="settings_about_actions_project_homepage">Page d\'accueil du projet</string>
+    <string name="settings_about_actions_share_logs">Partager les logs</string>
     <string name="settings_about_actions_support">Soutenir le développeur</string>
     <string name="settings_about_name">À propos</string>
     <string name="settings_about_version">version %1$s</string>

app/src/main/res/values-gl/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Buscar</string>
     <string name="settings_about_actions_licenses">Licenzas</string>
     <string name="settings_about_actions_project_homepage">Web do Proxecto</string>
+    <string name="settings_about_actions_share_logs">Compartir rexistros</string>
     <string name="settings_about_actions_support">Axuda ao desenvolvemento</string>
     <string name="settings_about_name">Acerca de</string>
     <string name="settings_about_version">versión %1$s</string>

app/src/main/res/values-hu/strings.xml

@@ -25,6 +25,7 @@
     <string name="search_input_placeholder">Keresés</string>
     <string name="settings_about_actions_licenses">Licenszek</string>
     <string name="settings_about_actions_project_homepage">Projekt weboldal</string>
+    <string name="settings_about_actions_share_logs">Logfájlok megosztása</string>
     <string name="settings_about_actions_support">Támogasd a fejlesztőt</string>
     <string name="settings_about_name">Az alkalmazásról</string>
     <string name="settings_about_version">%1$s verzió</string>

app/src/main/res/values-it/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Ricerca</string>
     <string name="settings_about_actions_licenses">Licenze</string>
     <string name="settings_about_actions_project_homepage">Pagina principale del progetto</string>
+    <string name="settings_about_actions_share_logs">Condividi i log</string>
     <string name="settings_about_actions_support">Sostieni lo sviluppatore</string>
     <string name="settings_about_name">Informazioni</string>
     <string name="settings_about_version">versione %1$s</string>

app/src/main/res/values-ko/strings.xml

@@ -28,6 +28,7 @@
     <string name="search_input_placeholder">검색</string>
     <string name="settings_about_actions_licenses">저작권</string>
     <string name="settings_about_actions_project_homepage">프로젝트 홈페이지</string>
+    <string name="settings_about_actions_share_logs">로그 공유</string>
     <string name="settings_about_actions_support">개발자 지원하기</string>
     <string name="settings_about_name">subtracks에 대하여</string>
     <string name="settings_about_version">버전: %1$s</string>

app/src/main/res/values-nb/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Søk</string>
     <string name="settings_about_actions_licenses">Lisenser</string>
     <string name="settings_about_actions_project_homepage">Prosjekthjemmeside</string>
+    <string name="settings_about_actions_share_logs">Dele logger</string>
     <string name="settings_about_actions_support">Støtt utvikleren</string>
     <string name="settings_about_name">Om</string>
     <string name="settings_about_version">versjon %1$s</string>

app/src/main/res/values-ru/strings.xml

@@ -32,6 +32,7 @@
     <string name="search_input_placeholder">Поиск</string>
     <string name="settings_about_actions_licenses">Лицензии</string>
     <string name="settings_about_actions_project_homepage">Сайт проекта</string>
+    <string name="settings_about_actions_share_logs">Поделиться журналами</string>
     <string name="settings_about_actions_support">Поддержать разработчика</string>
     <string name="settings_about_name">О Subtracks</string>
     <string name="settings_about_version">версия %1$s</string>

app/src/main/res/values-sv/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Sök</string>
     <string name="settings_about_actions_licenses">Licenser</string>
     <string name="settings_about_actions_project_homepage">Projekthemsida</string>
+    <string name="settings_about_actions_share_logs">Dela loggarna</string>
     <string name="settings_about_actions_support">Stöd utvecklaren</string>
     <string name="settings_about_name">Om</string>
     <string name="settings_about_version">version %1$s</string>

app/src/main/res/values-ta/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">தேடல்</string>
     <string name="settings_about_actions_licenses">உரிமங்கள்</string>
     <string name="settings_about_actions_project_homepage">திட்ட முகப்புப்பக்கம்</string>
+    <string name="settings_about_actions_share_logs">பதிவுகளைப் பகிரவும்</string>
     <string name="settings_about_actions_support">டெவலப்பரை ஆதரிக்கவும்</string>
     <string name="settings_about_name">பற்றி</string>
     <string name="settings_about_version">பதிப்பு %1$s</string>

app/src/main/res/values-th/strings.xml

@@ -28,6 +28,7 @@
     <string name="search_input_placeholder">ค้นหา</string>
     <string name="settings_about_actions_licenses">ใบอนุญาต</string>
     <string name="settings_about_actions_project_homepage">โฮมเพจของโครงการ</string>
+    <string name="settings_about_actions_share_logs">แบ่งปันล็อกไฟล์</string>
     <string name="settings_about_actions_support">ให้การสนับสนุนผู้พัฒนา</string>
     <string name="settings_about_name">เกี่ยวกับ</string>
     <string name="settings_about_version">เวอร์ชั่น %1$s</string>

app/src/main/res/values-tr/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Ara</string>
     <string name="settings_about_actions_licenses">Lisanslar</string>
     <string name="settings_about_actions_project_homepage">Proje Ana Sayfası</string>
+    <string name="settings_about_actions_share_logs">Günlükleri paylaş</string>
     <string name="settings_about_actions_support">Geliştiriciyi destekleyin</string>
     <string name="settings_about_name">Hakkında</string>
     <string name="settings_about_version">sürüm %1$s</string>

app/src/main/res/values-uk/strings.xml

@@ -30,6 +30,7 @@
     <string name="search_input_placeholder">Введіть заголовок/опис</string>
     <string name="settings_about_actions_licenses">Ліцензії</string>
     <string name="settings_about_actions_project_homepage">Головна сторінка проєкту</string>
+    <string name="settings_about_actions_share_logs">Поділитися журналами</string>
     <string name="settings_about_actions_support">Підтримайте розробника</string>
     <string name="settings_about_name">Про застосунок</string>
     <string name="settings_about_version">версія %1$s</string>

app/src/main/res/values-vi/strings.xml

@@ -28,6 +28,7 @@
     <string name="search_input_placeholder">Tìm kiếm</string>
     <string name="settings_about_actions_licenses">Bản quyền</string>
     <string name="settings_about_actions_project_homepage">Trang chủ dự án</string>
+    <string name="settings_about_actions_share_logs">Chia sẻ log</string>
     <string name="settings_about_actions_support">Hỗ trợ nhà phát triển</string>
     <string name="settings_about_name">Về ứng dụng</string>
     <string name="settings_about_version">phiên bản %1$s</string>

app/src/main/res/values/strings.xml

@@ -57,8 +57,15 @@
 
     <string name="settings_about_actions_licenses">Licenses</string>
     <string name="settings_about_actions_project_homepage">Project homepage</string>
+    <string name="settings_about_actions_share_logs">Share logs</string>
     <string name="settings_about_actions_support">Support the developer</string>
     <string name="settings_about_name">About</string>
+    <string name="settings_troubleshooting_name">Troubleshooting</string>
+    <string name="settings_about_share_logs_empty">No logs to send yet</string>
+    <string name="settings_about_share_logs_failed">Couldn\'t prepare the logs</string>
+    <string name="settings_about_share_logs_subject">Subtracks logs</string>
+    <string name="settings_about_verbose_logging">Verbose logging</string>
+    <string name="settings_about_verbose_logging_description">Log extra detail for troubleshooting</string>
     <string name="settings_about_version">Version %1$s</string>
     <string name="settings_music_name">Playback</string>
     <string name="settings_music_options_scrobble_description_on">Send now playing and play counts</string>

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+    <cache-path name="log_dumps" path="log_dumps/" />
+</paths>

app/src/nightly/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,29 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="299.84"
+    android:viewportHeight="219.51">
+  <group android:scaleX="0.43"
+      android:scaleY="0.3147989"
+      android:translateX="85.4544"
+      android:translateY="75.20425">
+    <path
+        android:pathData="m23.84,-0c-12.76,0 -23.44,13 -23.65,25.12 -0.42,79.03 0,160.73 0,170.4 0,12.59 9.8,23.99 23.41,23.99l253.58,0c11.4,0 22.66,-12.38 22.66,-22.79L299.84,24.12c0,-10.8 -10.24,-23.81 -21.84,-23.81 -11.6,0 -254.16,-0.31 -254.16,-0.31zM39.05,25.28c0,0 217.71,0.71 223.67,0.71 6.07,0 12.17,6.83 12.17,12.06l0,142.25c0,8.97 -6.97,14.63 -12.48,14.64l-33.42,0.07c-5.32,0.01 -9.93,-7.19 -11.35,-10.61 -1.89,-4.55 -11.08,-25.75 -12.1,-28.1 -0.6,-1.38 -2.9,-2.83 -5.89,-2.83L98.33,153.45c-2.68,0 -4.89,2.87 -5.67,4.71 -1.12,2.66 -9.02,21.39 -11.63,27.57 -2.73,6.46 -4.37,9.06 -11.47,9.06l-30.97,0c-7.44,0 -13.69,-7.17 -13.67,-15.18l0.28,-139.51c0,-6.88 5.54,-14.83 13.85,-14.83z"
+        android:strokeWidth="0.9"
+        android:fillColor="#FFB300"
+        android:fillType="nonZero"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M90.09,95.03m-32.1,0a32.42,32.1 90,1 1,64.21 0a32.42,32.1 90,1 1,-64.21 0"
+        android:strokeWidth="0.86"
+        android:fillColor="#FFB300"
+        android:fillType="nonZero"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M209.94,95.03m-32.1,0a32.42,32.1 90,1 1,64.21 0a32.42,32.1 90,1 1,-64.21 0"
+        android:strokeWidth="0.86"
+        android:fillColor="#FFB300"
+        android:fillType="nonZero"
+        android:strokeColor="#00000000"/>
+  </group>
+</vector>

app/src/nightly/res/values/ic_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#1A1200</color>
+</resources>

app/src/test/kotlin/com/subtracks/UserAgentTest.kt

@@ -0,0 +1,30 @@
+package com.subtracks
+
+import android.os.Build
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import okhttp3.Request
+import okhttp3.mockwebserver.MockResponse
+import okhttp3.mockwebserver.MockWebServer
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class UserAgentTest {
+    @Test
+    fun theSharedClientSendsTheSubtracksUserAgent() {
+        val server = MockWebServer()
+        server.enqueue(MockResponse())
+        server.start()
+
+        UserAgent
+            .httpClient()
+            .newCall(Request.Builder().url(server.url("/")).build())
+            .execute()
+            .close()
+        val header = server.takeRequest().getHeader("User-Agent")
+        server.shutdown()
+
+        assertEquals("subtracks (Android ${Build.VERSION.RELEASE}; ${BuildConfig.VERSION_NAME})", header)
+    }
+}

app/src/test/kotlin/com/subtracks/data/db/DbLoggingTest.kt

@@ -0,0 +1,150 @@
+package com.subtracks.data.db
+
+import androidx.room3.migration.Migration
+import androidx.sqlite.SQLiteConnection
+import androidx.sqlite.SQLiteDriver
+import androidx.sqlite.driver.bundled.BundledSQLiteDriver
+import androidx.sqlite.execSQL
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertNotNull
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class DbLoggingTest {
+    private val executions = mutableListOf<SqlExecution>()
+
+    private fun driver() = LoggingSQLiteDriver(BundledSQLiteDriver()) { executions += it }
+
+    @Test
+    fun forwardsConnectionPoolFlag() {
+        assertTrue(LoggingSQLiteDriver(FakeDriver(hasConnectionPool = true)) {}.hasConnectionPool)
+        assertFalse(LoggingSQLiteDriver(FakeDriver(hasConnectionPool = false)) {}.hasConnectionPool)
+    }
+
+    @Test
+    fun recordsOneExecutionPerBatchedWriteRow() {
+        driver().open(":memory:").use { connection ->
+            connection.prepare("CREATE TABLE t (id INTEGER PRIMARY KEY, name TEXT)").use { it.step() }
+            connection.prepare("INSERT INTO t (name) VALUES (?)").use { statement ->
+                repeat(3) { index ->
+                    statement.bindText(1, "row$index")
+                    statement.step()
+                    statement.reset()
+                    statement.clearBindings()
+                }
+            }
+        }
+        assertEquals(3, executions.count { it.sql.startsWith("INSERT") })
+    }
+
+    @Test
+    fun recordsSuccessfulSelect() {
+        driver().open(":memory:").use { connection ->
+            connection.prepare("CREATE TABLE t (id INTEGER PRIMARY KEY, name TEXT)").use { it.step() }
+            connection.prepare("INSERT INTO t (name) VALUES (?)").use {
+                it.bindText(1, "a")
+                it.step()
+            }
+            connection.prepare("SELECT * FROM t").use { statement ->
+                while (statement.step()) {
+                }
+            }
+        }
+        val select = executions.last { it.sql.startsWith("SELECT") }
+        assertNull(select.error)
+        assertEquals(1L, select.rows)
+        assertTrue(select.durationNanos > 0)
+    }
+
+    @Test
+    fun doesNotCountIdleTimeBetweenReuses() {
+        driver().open(":memory:").use { connection ->
+            connection.prepare("CREATE TABLE t (id INTEGER PRIMARY KEY, name TEXT)").use { it.step() }
+            connection.prepare("INSERT INTO t (name) VALUES (?)").use { statement ->
+                statement.bindText(1, "a")
+                statement.step()
+                statement.reset()
+                Thread.sleep(250)
+                statement.bindText(1, "b")
+                statement.step()
+                statement.reset()
+            }
+        }
+        val inserts = executions.filter { it.sql.startsWith("INSERT") }
+        assertEquals(2, inserts.size)
+        inserts.forEach { assertTrue("${it.durationMillis}ms", it.durationNanos < 100_000_000) }
+    }
+
+    @Test
+    fun recordsPrepareError() {
+        driver().open(":memory:").use { connection ->
+            runCatching { connection.prepare("THIS IS NOT SQL") }
+        }
+        val failed = executions.single()
+        assertNotNull(failed.error)
+        assertEquals("THIS IS NOT SQL", failed.sql)
+    }
+
+    @Test
+    fun recordsStepError() {
+        driver().open(":memory:").use { connection ->
+            connection.prepare("CREATE TABLE t (id INTEGER PRIMARY KEY)").use { it.step() }
+            connection.prepare("INSERT INTO t (id) VALUES (1)").use { it.step() }
+            runCatching {
+                connection.prepare("INSERT INTO t (id) VALUES (1)").use { it.step() }
+            }
+        }
+        val failed = executions.last { it.error != null }
+        assertTrue(failed.sql.startsWith("INSERT"))
+    }
+
+    @Test
+    fun loggedMigrationRunsDelegate() =
+        runTest {
+            val driver = LoggingSQLiteDriver(BundledSQLiteDriver()) {}
+            val migration =
+                LoggedMigration(
+                    object : Migration(1, 2) {
+                        override suspend fun migrate(connection: SQLiteConnection) {
+                            connection.execSQL("CREATE TABLE m (id INTEGER)")
+                        }
+                    },
+                )
+            driver.open(":memory:").use { connection ->
+                migration.migrate(connection)
+                connection.prepare("SELECT count(*) FROM m").use { statement ->
+                    statement.step()
+                    assertEquals(0L, statement.getLong(0))
+                }
+            }
+        }
+
+    @Test
+    fun loggedMigrationRethrows() =
+        runTest {
+            val driver = LoggingSQLiteDriver(BundledSQLiteDriver()) {}
+            val migration =
+                LoggedMigration(
+                    object : Migration(1, 2) {
+                        override suspend fun migrate(connection: SQLiteConnection) {
+                            error("nope")
+                        }
+                    },
+                )
+            driver.open(":memory:").use { connection ->
+                assertTrue(runCatching { migration.migrate(connection) }.isFailure)
+            }
+        }
+}
+
+private class FakeDriver(
+    override val hasConnectionPool: Boolean,
+) : SQLiteDriver {
+    override fun open(fileName: String): SQLiteConnection = error("open should not be called")
+}

app/src/test/kotlin/com/subtracks/data/db/QueryTimingMeasurementTest.kt

@@ -0,0 +1,312 @@
+package com.subtracks.data.db
+
+import android.content.Context
+import androidx.paging.PagingSource
+import androidx.room3.Room
+import androidx.sqlite.driver.bundled.BundledSQLiteDriver
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.data.model.Album
+import com.subtracks.data.model.Artist
+import com.subtracks.data.model.Playlist
+import com.subtracks.data.model.PlaylistSong
+import com.subtracks.data.model.Song
+import com.subtracks.data.model.Source
+import com.subtracks.data.source.MusicSource
+import com.subtracks.data.source.StarType
+import com.subtracks.data.sync.SyncService
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.test.runTest
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+import java.util.Collections
+import kotlin.math.max
+
+@RunWith(AndroidJUnit4::class)
+class QueryTimingMeasurementTest {
+    private val executions: MutableList<SqlExecution> = Collections.synchronizedList(mutableListOf())
+    private val timings = linkedMapOf<String, MutableList<Double>>()
+    private lateinit var db: SubtracksDatabase
+
+    @Before
+    fun setUp() {
+        val context = ApplicationProvider.getApplicationContext<Context>()
+        val driver = LoggingSQLiteDriver(BundledSQLiteDriver()) { executions += it }
+        db = Room.inMemoryDatabaseBuilder(context, SubtracksDatabase::class.java).setDriver(driver).build()
+    }
+
+    @After
+    fun tearDown() = db.close()
+
+    @Test
+    fun measure() =
+        runTest {
+            val songCount = System.getProperty("measure.songs")?.toIntOrNull() ?: 20_000
+            val items = items(songCount)
+            db.sourcesDao().upsertSource(
+                Source(id = 1, name = "bench", address = "http://localhost", isActive = true, createdAt = 0),
+            )
+            val source = FakeSource(items)
+
+            executions.clear()
+            val firstSyncMs = wall { SyncService(db, source).sync() }
+            val firstSyncExecutions = executions.toList()
+
+            executions.clear()
+            val secondSyncMs = wall { SyncService(db, source).sync() }
+            val secondSyncExecutions = executions.toList()
+
+            executions.clear()
+            measureReads()
+            val readExecutions = executions.toList()
+
+            val report =
+                buildReport(
+                    songCount = songCount,
+                    firstSyncMs = firstSyncMs,
+                    secondSyncMs = secondSyncMs,
+                    firstSyncExecutions = firstSyncExecutions,
+                    secondSyncExecutions = secondSyncExecutions,
+                    readExecutions = readExecutions,
+                )
+            val out = File("build/query-timing.txt")
+            out.parentFile?.mkdirs()
+            out.writeText(report)
+            print(report)
+        }
+
+    private suspend fun measureReads() {
+        val dao = db.libraryDao()
+        timed("albums first page (name)") { dao.albumsByName(1, 0, "").firstPage() }
+        timed("albums first page (artist)") { dao.albumsByArtist(1, 0, "").firstPage() }
+        timed("albums first page (year)") { dao.albumsByYear(1, 0, "").firstPage() }
+        timed("albums first page (added)") { dao.albumsByRecentlyAdded(1, 0, "").firstPage() }
+        timed("albums first page (starred)") { dao.albumsByStarred(1, 0, "").firstPage() }
+        timed("albums first page (frequent)") { dao.albumsByFrequent(1, 0, "").firstPage() }
+        timed("albums first page (recent)") { dao.albumsByRecent(1, 0, "").firstPage() }
+        timed("artists first page (name)") { dao.artistsByName(1, 0, "").firstPage() }
+        timed("artists first page (frequent)") { dao.artistsByFrequent(1, 0, "").firstPage() }
+        timed("playlists first page (name)") { dao.playlistsByName(1, "").firstPage() }
+        timed("albums deep page") { dao.albumsByName(1, 0, "").deepPage(1000) }
+        timed("albums search FTS") { dao.albumsByName(1, 0, "Album 1").firstPage() }
+        timed("albums search short") { dao.albumsByName(1, 0, "al").firstPage() }
+        timed("songs search FTS") { dao.searchSongs(1, "Song", 50).first() }
+        timed("home recently played") { dao.recentlyPlayedAlbums(1, 20).first() }
+        timed("home most played") { dao.mostPlayedAlbums(1, 20).first() }
+        timed("home recently added") { dao.recentlyAddedAlbums(1, 20).first() }
+        timed("home recently starred") { dao.recentlyStarredSongs(1, 20).first() }
+        timed("home genres") { dao.genresByMostPlayed(1).first() }
+        timed("home decades") { dao.decades(1).first() }
+        timed("recompute play data") { dao.recomputePlayData(1) }
+    }
+
+    private suspend fun <T : Any> PagingSource<Int, T>.firstPage(): List<T> =
+        (
+            load(
+                PagingSource.LoadParams.Refresh(key = null, loadSize = 100, placeholdersEnabled = false),
+            ) as PagingSource.LoadResult.Page
+        ).data
+
+    private suspend fun <T : Any> PagingSource<Int, T>.deepPage(offset: Int): List<T> =
+        (
+            load(
+                PagingSource.LoadParams.Append(key = offset, loadSize = 100, placeholdersEnabled = false),
+            ) as PagingSource.LoadResult.Page
+        ).data
+
+    private suspend fun <T> timed(
+        name: String,
+        iterations: Int = 10,
+        block: suspend () -> T,
+    ) {
+        runCatching { block() }
+        val samples = timings.getOrPut(name) { mutableListOf() }
+        repeat(iterations) {
+            val start = System.nanoTime()
+            val result = runCatching { block() }
+            if (result.isSuccess) samples += (System.nanoTime() - start) / 1e6
+        }
+    }
+
+    private suspend fun wall(block: suspend () -> Unit): Double {
+        val start = System.nanoTime()
+        block()
+        return (System.nanoTime() - start) / 1e6
+    }
+
+    private fun buildReport(
+        songCount: Int,
+        firstSyncMs: Double,
+        secondSyncMs: Double,
+        firstSyncExecutions: List<SqlExecution>,
+        secondSyncExecutions: List<SqlExecution>,
+        readExecutions: List<SqlExecution>,
+    ): String =
+        buildString {
+            appendLine("SQL query timing measurement")
+            appendLine("songs=$songCount  albums=${songCount / 10}  artists=${max(1, songCount / 200)}")
+            appendLine()
+            appendLine("sync: first=%.1fms  second(no-op)=%.1fms".format(firstSyncMs, secondSyncMs))
+            appendLine()
+            appendLine("=== named measurements (ms) ===")
+            appendLine("%-32s %6s %8s %8s %8s %8s".format("measurement", "n", "p50", "p95", "p99", "max"))
+            timings.forEach { (name, samples) ->
+                if (samples.isEmpty()) return@forEach
+                val sorted = samples.sorted()
+                appendLine(
+                    "%-32s %6d %8.2f %8.2f %8.2f %8.2f".format(
+                        name,
+                        sorted.size,
+                        pct(sorted, 50),
+                        pct(sorted, 95),
+                        pct(sorted, 99),
+                        sorted.last(),
+                    ),
+                )
+            }
+            appendLine()
+            appendLine("=== driver executions ===")
+            appendLine(overThresholds("first sync", firstSyncExecutions))
+            appendLine(overThresholds("second sync", secondSyncExecutions))
+            appendLine(overThresholds("reads", readExecutions))
+            appendLine()
+            appendLine("=== slowest first-sync executions ===")
+            firstSyncExecutions.sortedByDescending { it.durationMillis }.take(15).forEach {
+                appendLine("  %8.2fms rows=%-6d %s".format(it.durationMillis, it.rows, it.sql.replace(Regex("\\s+"), " ").take(140)))
+            }
+            appendLine("=== slowest read executions ===")
+            readExecutions.sortedByDescending { it.durationMillis }.take(15).forEach {
+                appendLine("  %8.2fms rows=%-6d %s".format(it.durationMillis, it.rows, it.sql.replace(Regex("\\s+"), " ").take(140)))
+            }
+        }
+
+    private fun overThresholds(
+        label: String,
+        records: List<SqlExecution>,
+    ): String {
+        val thresholds = listOf(10, 25, 50, 100, 250, 500)
+        val counts = thresholds.joinToString { t -> ">${t}ms=${records.count { it.durationMillis > t }}" }
+        return "$label: n=${records.size} $counts"
+    }
+
+    private fun pct(
+        sorted: List<Double>,
+        percentile: Int,
+    ): Double = sorted[((percentile / 100.0) * (sorted.size - 1)).toInt()]
+
+    internal data class Items(
+        val artists: List<Artist>,
+        val albums: List<Album>,
+        val songs: List<Song>,
+        val playlists: List<Playlist>,
+        val playlistSongs: List<PlaylistSong>,
+    )
+
+    private fun items(songCount: Int): Items {
+        val words = listOf("Midnight", "Abbey", "Blue", "Golden", "Silent", "Rolling", "Purple", "Electric")
+        val artistCount = max(1, songCount / 200)
+        val albumCount = max(1, songCount / 10)
+        val artists =
+            (0 until artistCount).map { i ->
+                Artist(sourceId = 1, id = "ar$i", name = "Artist ${words[i % words.size]} $i", albumCount = 10, starred = null)
+            }
+        val albums =
+            (0 until albumCount).map { i ->
+                Album(
+                    sourceId = 1,
+                    id = "al$i",
+                    artistId = "ar${i / 20}",
+                    name = "${words[i % words.size]} Album $i",
+                    albumArtist = "Artist ${i / 20}",
+                    created = 1_000_000L + i,
+                    coverArt = null,
+                    genre = null,
+                    year = (1950 + i % 60).toLong(),
+                    starred = if (i % 11 == 0) 100L + i else null,
+                    songCount = 10,
+                )
+            }
+        val songs =
+            (0 until songCount).map { i ->
+                Song(
+                    sourceId = 1,
+                    id = "s$i",
+                    albumId = "al${i / 10}",
+                    artistId = "ar${i / 200}",
+                    title = "${words[i % words.size]} Song $i",
+                    album = "Album ${i / 10}",
+                    artist = "Artist ${i / 200}",
+                    duration = 200,
+                    track = (i % 10 + 1).toLong(),
+                    disc = 1,
+                    starred = if (i % 7 == 0) 1000L + i else null,
+                    genre = null,
+                    created = 1_000_000L + i,
+                    playCount = (i % 13).toLong(),
+                    played = if (i % 5 == 0) 1_700_000_000_000L + i else null,
+                    genres = listOf("genre${i % 50}"),
+                )
+            }
+        val playlistCount = max(1, songCount / 100)
+        val playlists =
+            (0 until playlistCount).map { i ->
+                Playlist(
+                    sourceId = 1,
+                    id = "pl$i",
+                    name = "Playlist $i",
+                    comment = null,
+                    coverArt = null,
+                    songCount = 20,
+                    created = 1_000_000L + i,
+                    changed = 2_000_000L + i,
+                    duration = 3600,
+                )
+            }
+        val playlistSongs =
+            (0 until playlistCount).flatMap { p ->
+                (0 until 20).map { s -> PlaylistSong(1, "pl$p", "s${(p * 20 + s) % songCount}", s.toLong()) }
+            }
+        return Items(artists, albums, songs, playlists, playlistSongs)
+    }
+}
+
+private class FakeSource(
+    private val items: QueryTimingMeasurementTest.Items,
+    private val batchSize: Int = 500,
+) : MusicSource {
+    override val id: Long = 1
+
+    override suspend fun ping() = Unit
+
+    override suspend fun setStar(
+        type: StarType,
+        id: String,
+        starred: Boolean,
+    ) = Unit
+
+    override suspend fun scrobble(
+        songId: String,
+        submission: Boolean,
+        time: Long?,
+    ) = Unit
+
+    override fun artists(): Flow<List<Artist>> = batches(items.artists)
+
+    override fun albums(): Flow<List<Album>> = batches(items.albums)
+
+    override fun songs(): Flow<List<Song>> = batches(items.songs)
+
+    override fun playlists(): Flow<List<Playlist>> = batches(items.playlists)
+
+    override fun playlistSongs(playlistIds: List<String>): Flow<List<PlaylistSong>> = batches(items.playlistSongs)
+
+    private fun <T> batches(list: List<T>): Flow<List<T>> =
+        flow {
+            list.chunked(batchSize).forEach { emit(it) }
+        }
+}

app/src/test/kotlin/com/subtracks/data/prefs/UserPreferencesTest.kt

@@ -173,6 +173,21 @@ class UserPreferencesTest {
             prefs.setLastSeed(ArtworkSeedValue("art:2", 0xFF778899.toInt(), null))
             assertEquals(ArtworkSeedValue("art:2", 0xFF778899.toInt(), null), prefs.lastSeed())
 
+            file.delete()
+        }
+
+    @Test
+    fun verboseLoggingDefaultsOffAndRoundTrips() =
+        runTest {
+            val file = File.createTempFile("user-prefs", ".preferences_pb").apply { delete() }
+            val store = PreferenceDataStoreFactory.create(scope = backgroundScope) { file }
+            val prefs = UserPreferences(store)
+
+            assertEquals(false, prefs.verboseLogging().first())
+
+            prefs.setVerboseLogging(true)
+            assertEquals(true, prefs.verboseLogging().first())
+
             file.delete()
         }
 }

app/src/test/kotlin/com/subtracks/log/LogFileStoreTest.kt

@@ -0,0 +1,189 @@
+package com.subtracks.log
+
+import com.subtracks.data.db.SqlExecution
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TemporaryFolder
+import java.io.File
+import java.util.zip.ZipFile
+
+class LogFileStoreTest {
+    @get:Rule
+    val folder = TemporaryFolder()
+
+    private val root: File by lazy { folder.newFolder("logs") }
+
+    @Test
+    fun writesFormattedLine() {
+        val store = LogFileStore(root, LogLevel.VERBOSE)
+        store.write(LogLevel.INFO, "sync", "hello world", null)
+        store.flush()
+        val text = store.files().single().readText()
+        assertTrue(text, Regex("""\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} I sync hello world""").containsMatchIn(text))
+    }
+
+    @Test
+    fun redactsSubsonicParams() {
+        val store = LogFileStore(root, LogLevel.VERBOSE)
+        store.write(LogLevel.INFO, "http", "http://host/rest/stream?u=alice&p=hunter2&s=salt&t=tok&id=7", null)
+        store.flush()
+        val text = store.files().single().readText()
+        assertTrue(text, text.contains("u=REDACTED"))
+        assertTrue(text, text.contains("p=REDACTED"))
+        assertTrue(text, text.contains("&id=7"))
+        assertFalse(text, text.contains("hunter2"))
+        assertFalse(text, text.contains("salt"))
+        assertFalse(text, text.contains("tok"))
+    }
+
+    @Test
+    fun redactsBasicAuth() {
+        val store = LogFileStore(root, LogLevel.VERBOSE)
+        store.write(LogLevel.INFO, "http", "http://alice:hunter2@music.example.org/rest/ping", null)
+        store.flush()
+        val text = store.files().single().readText()
+        assertTrue(text, text.contains("http://REDACTED@music.example.org/rest/ping"))
+        assertFalse(text, text.contains("hunter2"))
+    }
+
+    @Test
+    fun includesStackTrace() {
+        val store = LogFileStore(root, LogLevel.VERBOSE)
+        store.write(LogLevel.ERROR, "sql", "boom", IllegalStateException("kaboom"))
+        store.flush()
+        val text = store.files().single().readText()
+        assertTrue(text, text.contains("IllegalStateException: kaboom"))
+    }
+
+    @Test
+    fun redactsCredentialsInThrowable() {
+        val store = LogFileStore(root, LogLevel.VERBOSE)
+        store.write(
+            LogLevel.ERROR,
+            "http",
+            "failed",
+            IllegalStateException("GET http://alice:secret@host/x?u=bob&p=hunter2 failed"),
+        )
+        store.flush()
+        val text = store.files().single().readText()
+        assertTrue(text, text.contains("REDACTED@host"))
+        assertFalse(text, text.contains("secret"))
+        assertFalse(text, text.contains("hunter2"))
+    }
+
+    @Test
+    fun dropsBelowMinimumLevel() {
+        val store = LogFileStore(root, LogLevel.WARN)
+        store.write(LogLevel.INFO, "x", "quiet", null)
+        store.write(LogLevel.WARN, "x", "loud", null)
+        store.flush()
+        val text = store.files().single().readText()
+        assertFalse(text, text.contains("quiet"))
+        assertTrue(text, text.contains("loud"))
+    }
+
+    @Test
+    fun setMinLevelChangesWhatIsWritten() {
+        val store = LogFileStore(root, LogLevel.WARN)
+        store.setMinLevel(LogLevel.VERBOSE)
+        store.write(LogLevel.VERBOSE, "x", "verbose-line", null)
+        store.setMinLevel(LogLevel.ERROR)
+        store.write(LogLevel.INFO, "x", "info-line", null)
+        store.flush()
+        val text = store.files().single().readText()
+        assertTrue(text, text.contains("verbose-line"))
+        assertFalse(text, text.contains("info-line"))
+    }
+
+    @Test
+    fun rotatesWhenFileExceedsCap() {
+        val store = LogFileStore(root, LogLevel.VERBOSE, maxFileBytes = 1)
+        repeat(4) { store.write(LogLevel.INFO, "x", "line $it", null) }
+        store.flush()
+        assertEquals(4, store.files().size)
+    }
+
+    @Test
+    fun prunesToMaxFiles() {
+        val store = LogFileStore(root, LogLevel.VERBOSE, maxFileBytes = 1, maxFiles = 3)
+        repeat(10) { store.write(LogLevel.INFO, "x", "line $it", null) }
+        store.flush()
+        assertEquals(3, store.files().size)
+    }
+
+    @Test
+    fun exportZipContainsLogs() {
+        val store = LogFileStore(root, LogLevel.VERBOSE)
+        store.write(LogLevel.INFO, "x", "one", null)
+        store.flush()
+        val zip = store.exportZip(folder.newFolder("out"))
+        assertTrue(zip != null)
+        ZipFile(zip!!).use { archive ->
+            assertEquals(1, archive.size())
+            assertTrue(
+                archive
+                    .entries()
+                    .nextElement()
+                    .name
+                    .endsWith(".log"),
+            )
+        }
+    }
+
+    @Test
+    fun exportZipIsNullWhenEmpty() {
+        val store = LogFileStore(root, LogLevel.VERBOSE)
+        assertNull(store.exportZip(folder.newFolder("out")))
+    }
+
+    @Test
+    fun slowQueryPredicateExcludesNonQueriesAndInternalSql() {
+        assertTrue(isSlowQuery(execution(150.0, "SELECT * FROM songs"), 100.0))
+        assertFalse(isSlowQuery(execution(50.0, "SELECT * FROM songs"), 100.0))
+        assertFalse(isSlowQuery(execution(150.0, "BEGIN IMMEDIATE TRANSACTION"), 100.0))
+        assertFalse(isSlowQuery(execution(150.0, "SELECT * FROM room_table_modification_log WHERE invalidated = 1"), 100.0))
+    }
+
+    @Test
+    fun classifiesDataStatements() {
+        assertTrue(isDataStatement("insert into t values (1)"))
+        assertTrue(isDataStatement("  SELECT 1"))
+        assertFalse(isDataStatement("PRAGMA user_version"))
+        assertFalse(isDataStatement("END TRANSACTION"))
+    }
+
+    @Test
+    fun classifiesReadStatements() {
+        assertTrue(isReadStatement("select * from songs"))
+        assertTrue(isReadStatement("WITH x AS (SELECT 1) SELECT * FROM x"))
+        assertFalse(isReadStatement("INSERT INTO t VALUES (1)"))
+    }
+
+    @Test
+    fun detectsUpsertConflictErrors() {
+        assertTrue(
+            isUpsertConflict(
+                "INSERT INTO playback_cursor (id) VALUES (?)",
+                IllegalStateException("UNIQUE constraint failed: playback_cursor.id"),
+            ),
+        )
+        assertTrue(
+            isUpsertConflict(
+                "INSERT OR ABORT INTO t VALUES (?)",
+                IllegalStateException("PRIMARY KEY constraint failed"),
+            ),
+        )
+        assertFalse(isUpsertConflict("UPDATE t SET x = 1", IllegalStateException("UNIQUE constraint failed: t.x")))
+        assertFalse(isUpsertConflict("SELECT * FROM t", IllegalStateException("no such table: t")))
+        assertFalse(isUpsertConflict("INSERT INTO t VALUES (?)", IllegalStateException("Error code: 1555")))
+    }
+
+    private fun execution(
+        milliseconds: Double,
+        sql: String,
+    ) = SqlExecution(sql, (milliseconds * 1_000_000).toLong(), 0, null)
+}

app/src/test/kotlin/com/subtracks/ui/AppScreenshotTest.kt

@@ -362,6 +362,7 @@ class AppScreenshotTest {
                     onAddServer = {},
                     onOpenDownloads = {},
                     onOpenLicenses = {},
+                    onShareLogs = {},
                     onBack = {},
                 )
             }

app/src/test/kotlin/com/subtracks/ui/components/CoverArtReloadTest.kt

@@ -0,0 +1,106 @@
+package com.subtracks.ui.components
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.Color
+import androidx.activity.ComponentActivity
+import androidx.compose.foundation.layout.size
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.test.junit4.v2.createAndroidComposeRule
+import androidx.compose.ui.unit.dp
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import coil3.ImageLoader
+import coil3.SingletonImageLoader
+import coil3.annotation.DelicateCoilApi
+import coil3.asImage
+import coil3.test.FakeImageLoaderEngine
+import com.subtracks.data.model.CoverArtRef
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.annotation.GraphicsMode
+import java.util.concurrent.atomic.AtomicInteger
+
+@OptIn(DelicateCoilApi::class)
+@RunWith(AndroidJUnit4::class)
+@GraphicsMode(GraphicsMode.Mode.NATIVE)
+class CoverArtReloadTest {
+    @get:Rule
+    val composeRule = createAndroidComposeRule<ComponentActivity>()
+
+    private val requests = AtomicInteger(0)
+
+    @Before
+    fun installImageLoader() {
+        SingletonImageLoader.reset()
+        val image = Bitmap.createBitmap(8, 8, Bitmap.Config.ARGB_8888).apply { eraseColor(Color.RED) }.asImage()
+        val engine =
+            FakeImageLoaderEngine
+                .Builder()
+                .requestTransformer {
+                    requests.incrementAndGet()
+                    it
+                }.default(image)
+                .build()
+        SingletonImageLoader.setUnsafe(
+            ImageLoader
+                .Builder(ApplicationProvider.getApplicationContext<Context>())
+                .components { add(engine) }
+                .build(),
+        )
+    }
+
+    @After
+    fun resetImageLoader() {
+        SingletonImageLoader.reset()
+    }
+
+    @Test
+    fun aNewSaltedUrlForTheSameArtworkDoesNotRestartTheSquareLoad() {
+        assertANewSaltedUrlDoesNotReload(square = true, thumbnail = false)
+    }
+
+    @Test
+    fun aNewSaltedUrlForTheSameArtworkDoesNotRestartTheNonSquareLoad() {
+        assertANewSaltedUrlDoesNotReload(square = false, thumbnail = false)
+    }
+
+    @Test
+    fun aNewSaltedUrlForTheSameArtworkDoesNotRestartTheThumbnailLoad() {
+        assertANewSaltedUrlDoesNotReload(square = true, thumbnail = true)
+    }
+
+    private fun assertANewSaltedUrlDoesNotReload(
+        square: Boolean,
+        thumbnail: Boolean,
+    ) {
+        val refState = mutableStateOf(CoverArtRef(url = "http://host/art?id=1&s=one", cacheKey = "1:art:false"))
+        val thumbnailState: MutableState<CoverArtRef>? =
+            if (thumbnail) mutableStateOf(CoverArtRef(url = "http://host/art?id=1&t=one", cacheKey = "1:art:true")) else null
+        val expected = if (thumbnail) 2 else 1
+        composeRule.setContent {
+            CoverArt(
+                ref = refState.value,
+                name = "Kid A",
+                thumbnailRef = thumbnailState?.value,
+                square = square,
+                modifier = Modifier.size(64.dp),
+            )
+        }
+        composeRule.waitUntil(timeoutMillis = 5_000) { requests.get() == expected }
+
+        refState.value = CoverArtRef(url = "http://host/art?id=1&s=two", cacheKey = "1:art:false")
+        thumbnailState?.value = CoverArtRef(url = "http://host/art?id=1&t=two", cacheKey = "1:art:true")
+        composeRule.waitForIdle()
+        composeRule.mainClock.advanceTimeBy(500)
+        composeRule.waitForIdle()
+
+        assertEquals("a fresh salt for the same artwork must not rebuild the image request", expected, requests.get())
+    }
+}

app/src/test/kotlin/com/subtracks/ui/settings/LicensesScreenTest.kt

@@ -67,6 +67,7 @@ class LicensesScreenTest {
                     onAddServer = {},
                     onOpenDownloads = {},
                     onOpenLicenses = { opened = true },
+                    onShareLogs = {},
                     onBack = {},
                 )
             }

gradle.properties

@@ -3,6 +3,7 @@ org.gradle.parallel=true
 org.gradle.caching=true
 org.gradle.configuration-cache=true
 org.gradle.configuration-cache.problems=warn
+org.gradle.daemon.idletimeout=600000
 
 android.useAndroidX=true
 android.nonTransitiveRClass=true