feat(android): a diagnostics page answers why the fleet row is stale

A stale "last seen" had no client-side answer: a dead worker, a down
claw, and a claw that drops writes all looked identical from the
settings screen. The new page separates them: the WorkManager jobs'
live state (a cancelled schedule renders as "not scheduled"), the two
clocks — the phone's last landed report against the claw's last stamp
— whose disagreement names the broken end, auto-detected system checks
(battery optimization, background restriction, notifications) with
jumps into the exact settings page, a report-now kick, and a 200-line
in-memory flight recorder where every worker run logs its outcome.

android/app/src/main/java/rs/rhema/phone/di/AppContainer.kt

@@ -2,6 +2,7 @@ package rs.rhema.phone.di
 
 import android.content.Context
 import rs.rhema.phone.data.AgentIdentityRepository
+import rs.rhema.phone.diagnostics.DiagLog
 import rs.rhema.phone.data.SessionCache
 import rs.rhema.phone.data.SettingsRepository
 import rs.rhema.phone.data.StatusRepository
@@ -38,5 +39,9 @@ class AppContainer(context: Context) {
 
     val notifier = Notifier(appContext)
 
+    // The workers' flight recorder: every run logs its outcome here, and
+    // the diagnostics screen reads it back.
+    val diag = DiagLog()
+
     fun schedulePeriodicWork() = schedulePeriodicWork(appContext)
 }

android/app/src/main/java/rs/rhema/phone/diagnostics/DiagLog.kt

@@ -0,0 +1,46 @@
+package rs.rhema.phone.diagnostics
+
+import rs.rhema.phone.net.ClawResult
+
+/**
+ * The app's in-memory flight recorder: a bounded ring of one-line events
+ * the workers and screens append to, newest last. It lives only as long
+ * as the process — which is exactly the point: "what did the background
+ * work actually do while nobody was watching" is the question the
+ * diagnostics screen answers from it, and a log that outlives the
+ * process would need storage and rotation this app does not otherwise
+ * want.
+ */
+class DiagLog(private val capacity: Int = 200) {
+
+    /** One recorded line: when it happened, and the line itself. */
+    data class Entry(val at: Long, val line: String)
+
+    private val lock = Any()
+    private val entries = ArrayDeque<Entry>()
+
+    /** Appends one line, dropping the oldest when the ring is full. */
+    fun log(line: String) {
+        val entry = Entry(System.currentTimeMillis(), line)
+        synchronized(lock) {
+            entries.addLast(entry)
+            while (entries.size > capacity) {
+                entries.removeFirst()
+            }
+        }
+    }
+
+    /** A copy of the ring, oldest first. */
+    fun snapshot(): List<Entry> = synchronized(lock) { entries.toList() }
+}
+
+/**
+ * The one failure vocabulary every worker logs: an HTTP status with the
+ * body's head (the claw's error shapes carry the reason there), or the
+ * network message. A token never appears here — bodies are error JSON.
+ */
+fun ClawResult<*>.diagText(): String = when (this) {
+    is ClawResult.HttpError -> "HTTP $code" + (body?.let { " — ${it.take(160)}" } ?: "")
+    is ClawResult.Network -> "network: $message"
+    is ClawResult.Ok -> "ok"
+}

android/app/src/main/java/rs/rhema/phone/ui/DiagnosticsScreen.kt

@@ -0,0 +1,388 @@
+package rs.rhema.phone.ui
+
+import android.app.ActivityManager
+import android.app.NotificationManager
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.PowerManager
+import android.provider.Settings
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Button
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.work.WorkInfo
+import androidx.work.WorkManager
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.isActive
+import rs.rhema.phone.R
+import rs.rhema.phone.di.AppContainer
+import rs.rhema.phone.net.ClawResult
+import rs.rhema.phone.work.PHONE_COMMANDS
+import rs.rhema.phone.work.PHONE_STATUS
+import rs.rhema.phone.work.NOTIFICATIONS
+import rs.rhema.phone.work.enqueuePhoneStatusNow
+
+/**
+ * The background-work health page: what the three scheduled jobs are
+ * doing, whether this phone's reports are actually landing on the claw
+ * (the two clocks' disagreement is the diagnosis between "the worker is
+ * dead", "the claw is down", and "the claw is up but not storing"), the
+ * system checks whose wrong setting silences the workers, and the
+ * workers' own log. Checks re-read on every ON_RESUME so returning from
+ * the settings app flips the row without a restart.
+ */
+@Composable
+fun DiagnosticsContent(container: AppContainer) {
+    val lifecycleOwner = LocalLifecycleOwner.current
+    var resumeKey by remember { mutableIntStateOf(0) }
+    DisposableEffect(lifecycleOwner) {
+        val observer = LifecycleEventObserver { _, event ->
+            if (event == Lifecycle.Event.ON_RESUME) resumeKey++
+        }
+        lifecycleOwner.lifecycle.addObserver(observer)
+        onDispose { lifecycleOwner.lifecycle.removeObserver(observer) }
+    }
+
+    // Four cards where every other settings page has one: the column owns
+    // the spacing the single-card pages never needed.
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(bottom = 24.dp),
+        verticalArrangement = Arrangement.spacedBy(16.dp),
+    ) {
+        WorkCard(container)
+        ClocksCard(container, resumeKey)
+        ChecksCard(resumeKey)
+        LogCard(container)
+    }
+}
+
+// ---------------------------------------------------------------- work
+
+/**
+ * The three periodic jobs' live state, straight from WorkManager. An
+ * empty info list is the loud answer: the schedule is gone (cancelled,
+ * force-stopped, never enqueued) — the exact "silent for days" state the
+ * rest of the app cannot show.
+ */
+@Composable
+private fun WorkCard(container: AppContainer) {
+    val context = LocalContext.current
+    val wm = remember { WorkManager.getInstance(context) }
+    val statusInfos by wm.getWorkInfosForUniqueWorkFlow(PHONE_STATUS).collectAsState(initial = null)
+    val notifyInfos by wm.getWorkInfosForUniqueWorkFlow(NOTIFICATIONS).collectAsState(initial = null)
+    val commandInfos by wm.getWorkInfosForUniqueWorkFlow(PHONE_COMMANDS).collectAsState(initial = null)
+
+    RhemaCard(title = stringResource(R.string.card_diag_work), meta = stringResource(R.string.diag_work_hint)) {
+        WorkRow(stringResource(R.string.diag_work_status), statusInfos, first = true)
+        WorkRow(stringResource(R.string.diag_work_notify), notifyInfos)
+        WorkRow(stringResource(R.string.diag_work_commands), commandInfos)
+        CardRow(
+            title = stringResource(R.string.diag_report_now_title),
+            description = stringResource(R.string.diag_report_now_desc),
+        ) {
+            Button(onClick = { enqueuePhoneStatusNow(context) }) {
+                Text(stringResource(R.string.diag_report_now))
+            }
+        }
+    }
+}
+
+@Composable
+private fun WorkRow(label: String, infos: List<WorkInfo>?, first: Boolean = false) {
+    // Periodic work holds one info; take the first for both the state and
+    // the next window. An empty list means the schedule itself is gone.
+    val info = infos?.firstOrNull()
+    val stateLabel = when {
+        infos == null -> stringResource(R.string.diag_state_checking)
+        info == null -> stringResource(R.string.diag_state_not_scheduled)
+        else -> when (info.state) {
+            WorkInfo.State.ENQUEUED -> stringResource(R.string.diag_state_enqueued)
+            WorkInfo.State.RUNNING -> stringResource(R.string.diag_state_running)
+            WorkInfo.State.SUCCEEDED -> stringResource(R.string.diag_state_enqueued)
+            WorkInfo.State.FAILED -> stringResource(R.string.diag_state_failed)
+            WorkInfo.State.BLOCKED -> stringResource(R.string.diag_state_blocked)
+            WorkInfo.State.CANCELLED -> stringResource(R.string.diag_state_cancelled)
+        }
+    }
+    val tint = when (info?.state) {
+        WorkInfo.State.RUNNING -> JadeiteOk
+        WorkInfo.State.FAILED, WorkInfo.State.CANCELLED -> JadeiteError
+        WorkInfo.State.BLOCKED -> JadeiteWarn
+        null -> JadeiteWarn
+        else -> JadeiteText3
+    }
+    val detail = when {
+        infos == null -> null
+        info == null -> null
+        else -> listOfNotNull(
+            info.nextScheduleTimeMillis
+                .takeIf { it > 0 && it != Long.MAX_VALUE }
+                ?.let { stringResource(R.string.diag_work_next_fmt, inMinutes(it)) },
+            info.runAttemptCount
+                .takeIf { it > 0 }
+                ?.let { stringResource(R.string.diag_work_attempts_fmt, it) },
+        ).joinToString(" · ").ifEmpty { null }
+    }
+    CardRow(title = label, description = detail, first = first) {
+        AppBadge(stateLabel, tint = tint)
+    }
+}
+
+// -------------------------------------------------------------- clocks
+
+/**
+ * The two ends of the reporting pipeline, one clock each: when this
+ * phone last landed a full report (its own record), and when the claw
+ * last stamped this device (the fleet row's `last_seen`, re-read live).
+ * The callout names the disagreement, because that disagreement is the
+ * whole diagnosis.
+ */
+@Composable
+private fun ClocksCard(container: AppContainer, resumeKey: Int) {
+    val lastReportAt by container.status.lastReportAt.collectAsState(initial = 0L)
+    // null = unchecked, -1 = checked and the claw has no row for us.
+    var clawSeen by remember { mutableStateOf<Long?>(null) }
+    var clawError by remember { mutableStateOf<String?>(null) }
+
+    LaunchedEffect(resumeKey, lastReportAt) {
+        when (val result = container.api.phones()) {
+            is ClawResult.Ok -> {
+                val deviceId = container.settings.deviceId()
+                clawSeen = result.value.phones
+                    .firstOrNull { it.device == deviceId }
+                    ?.lastSeen ?: -1L
+                clawError = null
+            }
+            is ClawResult.HttpError -> clawError = "HTTP ${result.code}"
+            is ClawResult.Network -> clawError = result.message
+        }
+    }
+
+    RhemaCard(title = stringResource(R.string.card_diag_clocks)) {
+        CardRow(
+            title = stringResource(R.string.diag_clock_phone),
+            description = stringResource(R.string.diag_clock_phone_desc),
+            first = true,
+        ) {
+            AppBadge(if (lastReportAt > 0) clock(lastReportAt) else stringResource(R.string.diag_clock_never))
+        }
+        CardRow(
+            title = stringResource(R.string.diag_clock_claw),
+            description = stringResource(R.string.diag_clock_claw_desc),
+        ) {
+            val seen = clawSeen
+            AppBadge(
+                when {
+                    clawError != null -> stringResource(R.string.diag_clock_unreachable)
+                    seen == null -> stringResource(R.string.diag_state_checking)
+                    seen < 0 -> stringResource(R.string.diag_clock_never)
+                    else -> clock(seen)
+                },
+            )
+        }
+
+        val currentError = clawError
+        val seen = clawSeen
+        when {
+            currentError != null -> AppCallout(
+                tone = CalloutTone.Error,
+                text = stringResource(R.string.diag_callout_unreachable, currentError),
+            )
+            // The claw is behind the phone by more than one cadence: posts
+            // are being sent and not stored. One cadence of drift is the
+            // schedule's normal jitter; anything more is a lie one of the
+            // two ends is telling.
+            seen != null && seen > 0 && lastReportAt > seen + NOT_LANDED_MS ->
+                AppCallout(
+                    tone = CalloutTone.Warn,
+                    text = stringResource(R.string.diag_callout_not_landing),
+                )
+            lastReportAt == 0L -> AppCallout(
+                tone = CalloutTone.Info,
+                text = stringResource(R.string.diag_callout_never_landed),
+            )
+        }
+    }
+}
+
+// -------------------------------------------------------------- checks
+
+/**
+ * The system settings that silence background work, each auto-detected
+ * and each answered with a jump into the exact settings page when the
+ * setting is wrong. Nothing OS buries these three; finding them by hand
+ * is the part nobody does.
+ */
+@Composable
+private fun ChecksCard(resumeKey: Int) {
+    val context = LocalContext.current
+    // Re-read on resume: the point of the fix buttons is coming back from
+    // the settings app, so the row must flip without a restart.
+    val powerOk = remember(resumeKey) {
+        context.getSystemService(PowerManager::class.java)
+            ?.isIgnoringBatteryOptimizations(context.packageName) == true
+    }
+    val backgroundOk = remember(resumeKey) {
+        // Background restriction is API 28+; below it the answer is "no
+        // such switch", which reads as fine.
+        Build.VERSION.SDK_INT < 28 ||
+            context.getSystemService(ActivityManager::class.java)?.isBackgroundRestricted != true
+    }
+    val notificationsOk = remember(resumeKey) {
+        context.getSystemService(NotificationManager::class.java)?.areNotificationsEnabled() == true
+    }
+
+    RhemaCard(title = stringResource(R.string.card_diag_checks)) {
+        CardRow(
+            title = stringResource(R.string.diag_check_battery),
+            description = stringResource(R.string.diag_check_battery_desc),
+            first = true,
+        ) {
+            if (powerOk) {
+                AppBadge(stringResource(R.string.diag_check_ok), tint = JadeiteOk)
+            } else {
+                OutlinedButton(onClick = {
+                    context.startActivity(Intent(Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS))
+                }) {
+                    Text(stringResource(R.string.diag_check_battery_fix))
+                }
+            }
+        }
+        CardRow(
+            title = stringResource(R.string.diag_check_background),
+            description = stringResource(R.string.diag_check_background_desc),
+        ) {
+            if (backgroundOk) {
+                AppBadge(stringResource(R.string.diag_check_ok), tint = JadeiteOk)
+            } else {
+                OutlinedButton(onClick = { openAppDetails(context) }) {
+                    Text(stringResource(R.string.diag_check_background_fix))
+                }
+            }
+        }
+        CardRow(
+            title = stringResource(R.string.diag_check_notifications),
+            description = stringResource(R.string.diag_check_notifications_desc),
+        ) {
+            if (notificationsOk) {
+                AppBadge(stringResource(R.string.diag_check_ok), tint = JadeiteOk)
+            } else {
+                OutlinedButton(onClick = {
+                    context.startActivity(
+                        Intent(Settings.ACTION_APP_NOTIFICATION_SETTINGS)
+                            .putExtra(Settings.EXTRA_APP_PACKAGE, context.packageName),
+                    )
+                }) {
+                    Text(stringResource(R.string.diag_check_notifications_fix))
+                }
+            }
+        }
+    }
+}
+
+// ----------------------------------------------------------------- log
+
+/** The workers' flight recorder, newest first, with a copy-out button. */
+@Composable
+private fun LogCard(container: AppContainer) {
+    var entries by remember { mutableStateOf(container.diag.snapshot()) }
+    // The ring only grows while workers run; a light poll keeps the tail
+    // live without wiring a flow through the recorder.
+    LaunchedEffect(Unit) {
+        while (isActive) {
+            entries = container.diag.snapshot()
+            delay(2_000)
+        }
+    }
+    val clipboard = LocalClipboardManager.current
+
+    RhemaCard(title = stringResource(R.string.card_diag_log), meta = stringResource(R.string.diag_log_hint)) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(16.dp),
+            verticalArrangement = Arrangement.spacedBy(4.dp),
+        ) {
+            if (entries.isEmpty()) {
+                Text(
+                    stringResource(R.string.diag_log_empty),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = JadeiteText3,
+                )
+            } else {
+                entries.reversed().take(60).forEach { entry ->
+                    Text(
+                        clock(entry.at) + "  " + entry.line,
+                        style = MaterialTheme.typography.bodySmall,
+                        fontFamily = JadeiteMono,
+                        color = JadeiteText2,
+                    )
+                }
+            }
+            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                if (entries.isNotEmpty()) {
+                    OutlinedButton(onClick = {
+                        clipboard.setText(
+                            AnnotatedString(entries.joinToString("\n") { "${clock(it.at)} ${it.line}" }),
+                        )
+                    }) {
+                        Text(stringResource(R.string.diag_log_copy))
+                    }
+                }
+            }
+        }
+    }
+}
+
+// ------------------------------------------------------------ helpers
+
+/** One cadence plus margin: more drift than this and the claw is lying. */
+private const val NOT_LANDED_MS = 45 * 60_000L
+
+/** The absolute stamp the diagnostics vocabulary speaks: local wall time. */
+private fun clock(millis: Long): String =
+    SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.getDefault()).format(Date(millis))
+
+/** "in 7m"-style relative label, floor zero. */
+private fun inMinutes(thenMillis: Long): String {
+    val minutes = ((thenMillis - System.currentTimeMillis()) / 60_000L).coerceAtLeast(0)
+    return "${minutes}m"
+}
+
+private fun openAppDetails(context: Context) {
+    context.startActivity(
+        Intent(
+            Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
+            android.net.Uri.fromParts("package", context.packageName, null),
+        ),
+    )
+}

android/app/src/main/java/rs/rhema/phone/ui/SettingsScreen.kt

@@ -72,6 +72,10 @@ fun SettingsScreen(container: AppContainer, onConnected: () -> Unit = {}) {
                 title = stringResource(R.string.settings_entry_devices),
                 onBack = { section = null },
             ) { PhonesCard(container) }
+            SECTION_DIAGNOSTICS -> SettingsPage(
+                title = stringResource(R.string.settings_entry_diagnostics),
+                onBack = { section = null },
+            ) { DiagnosticsContent(container) }
             SECTION_PROVIDERS -> SettingsPage(
                 title = stringResource(R.string.settings_entry_providers),
                 onBack = { section = null },
@@ -85,6 +89,7 @@ fun SettingsScreen(container: AppContainer, onConnected: () -> Unit = {}) {
 // rotation through them).
 private const val SECTION_REPORTING = "reporting"
 private const val SECTION_DEVICES = "devices"
+private const val SECTION_DIAGNOSTICS = "diagnostics"
 private const val SECTION_PROVIDERS = "providers"
 private const val SECTION_CONNECTION = "connection"
 
@@ -105,6 +110,11 @@ private val SECTIONS = listOf(
                 R.string.settings_entry_devices,
                 R.string.settings_entry_devices_desc,
             ),
+            SettingsEntry(
+                SECTION_DIAGNOSTICS,
+                R.string.settings_entry_diagnostics,
+                R.string.settings_entry_diagnostics_desc,
+            ),
         ),
     ),
     SettingsSection(

android/app/src/main/java/rs/rhema/phone/work/NotificationsWorker.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import androidx.work.CoroutineWorker
 import androidx.work.WorkerParameters
 import rs.rhema.phone.RhemaApp
+import rs.rhema.phone.diagnostics.diagText
 import rs.rhema.phone.net.ClawResult
 import kotlinx.coroutines.flow.first
 
@@ -18,9 +19,20 @@ class NotificationsWorker(context: Context, params: WorkerParameters) : Coroutin
         val since = container.status.notificationCursor.first()
 
         val notifications = when (val result = container.api.notifications(deviceId, since)) {
-            is ClawResult.Ok -> result.value
-            is ClawResult.HttpError -> return if (result.code >= 500) Result.retry() else Result.failure()
-            is ClawResult.Network -> return Result.retry()
+            is ClawResult.Ok -> {
+                container.diag.log(
+                    if (result.value.isEmpty()) "notify: idle" else "notify: ${result.value.size} delivered",
+                )
+                result.value
+            }
+            is ClawResult.HttpError -> {
+                container.diag.log("notify: ${result.diagText()}")
+                return if (result.code >= 500) Result.retry() else Result.failure()
+            }
+            is ClawResult.Network -> {
+                container.diag.log("notify: ${result.diagText()}")
+                return Result.retry()
+            }
         }
 
         for (notification in notifications) {

android/app/src/main/java/rs/rhema/phone/work/PhoneCommandWorker.kt

@@ -6,6 +6,7 @@ import androidx.work.CoroutineWorker
 import androidx.work.WorkerParameters
 import rs.rhema.phone.RhemaApp
 import rs.rhema.phone.di.AppContainer
+import rs.rhema.phone.diagnostics.diagText
 import rs.rhema.phone.net.ClawResult
 import rs.rhema.phone.net.PhoneCommand
 import kotlinx.serialization.json.JsonObject
@@ -23,16 +24,32 @@ class PhoneCommandWorker(context: Context, params: WorkerParameters) : Coroutine
         val deviceId = container.settings.deviceId()
 
         val commands = when (val result = container.api.phoneCommands(deviceId)) {
-            is ClawResult.Ok -> result.value
-            is ClawResult.HttpError -> return if (result.code >= 500) Result.retry() else Result.failure()
-            is ClawResult.Network -> return Result.retry()
+            is ClawResult.Ok -> {
+                container.diag.log(
+                    if (result.value.isEmpty()) "commands: idle" else "commands: ${result.value.size} queued",
+                )
+                result.value
+            }
+            is ClawResult.HttpError -> {
+                container.diag.log("commands: ${result.diagText()}")
+                return if (result.code >= 500) Result.retry() else Result.failure()
+            }
+            is ClawResult.Network -> {
+                container.diag.log("commands: ${result.diagText()}")
+                return Result.retry()
+            }
         }
 
         for (command in commands) {
             val (ok, detail) = execute(container, command)
+            container.diag.log(
+                "commands: ${command.action} -> " +
+                    (if (ok) "ok" else "failed: ${detail ?: "no detail"}"),
+            )
             // Stop at the first failed ack: the queue is ordered, later
             // commands must not jump ahead of an un-acked one.
             if (container.api.postPhoneCommandResult(command.id, ok, detail) !is ClawResult.Ok) {
+                container.diag.log("commands: ack failed: ${command.id}, retry next run")
                 return Result.retry()
             }
         }

android/app/src/main/java/rs/rhema/phone/work/PhoneStatusWorker.kt

@@ -11,6 +11,7 @@ import androidx.work.CoroutineWorker
 import androidx.work.WorkerParameters
 import rs.rhema.phone.RhemaApp
 import rs.rhema.phone.data.PhoneSnapshot
+import rs.rhema.phone.diagnostics.diagText
 import rs.rhema.phone.net.ClawResult
 import rs.rhema.phone.sensors.LocationFix
 import rs.rhema.phone.sensors.ForegroundApp
@@ -150,15 +151,28 @@ class PhoneStatusWorker(context: Context, params: WorkerParameters) : CoroutineW
             }
         }
 
+        // The start line is the liveness beacon: the diagnostics screen
+        // distinguishes "worker ran and failed" (this line, then a failure
+        // line) from "worker never ran" (neither).
+        container.diag.log(
+            "status: run battery=${snapshot.batteryLevel ?: "?"} " +
+                "charging=${snapshot.charging ?: "?"} network=${snapshot.network ?: "?"} " +
+                "transitions=${transitions.size}",
+        )
+
         for ((topic, payload) in transitions) {
             val result = container.api.ingest(SOURCE, "phone:$deviceId:$topic", payload)
             // The snapshot stays unsaved, so the next scheduled run re-derives
             // this whole transition set and posts it again. Retrying here
             // instead would push that run out on WorkManager's backoff, and a
             // phone in a pocket would go quiet for hours.
-            if (result !is ClawResult.Ok) return Result.success()
+            if (result !is ClawResult.Ok) {
+                container.diag.log("status: $topic failed: ${result.diagText()}")
+                return Result.success()
+            }
         }
         container.status.setSnapshot(snapshot)
+        container.diag.log("status: posted ${transitions.joinToString { it.first }}")
         return Result.success()
     }
 

android/app/src/main/java/rs/rhema/phone/work/Scheduling.kt

@@ -10,9 +10,11 @@ import androidx.work.PeriodicWorkRequestBuilder
 import androidx.work.WorkManager
 import java.time.Duration
 
-private const val PHONE_STATUS = "phone_status"
-private const val NOTIFICATIONS = "notifications"
-private const val PHONE_COMMANDS = "phone_commands"
+// The unique names double as the diagnostics screen's work rows: it reads
+// the live WorkInfo for each, so the spellings live here and nowhere else.
+internal const val PHONE_STATUS = "phone_status"
+internal const val NOTIFICATIONS = "notifications"
+internal const val PHONE_COMMANDS = "phone_commands"
 private const val PHONE_STATUS_KICK = "phone_status_kick"
 private const val PHONE_COMMANDS_KICK = "phone_commands_kick"
 

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

@@ -97,6 +97,51 @@
     <string name="reporting_on">on</string>
     <string name="reporting_allow">Allow</string>
 
+    <string name="settings_entry_diagnostics">Diagnostics</string>
+    <string name="settings_entry_diagnostics_desc">Background work, claw reachability, and the app log</string>
+    <string name="card_diag_work">Background work</string>
+    <string name="diag_work_hint">The scheduled jobs and their next window</string>
+    <string name="diag_work_status">Status reporting</string>
+    <string name="diag_work_notify">Notification poll</string>
+    <string name="diag_work_commands">Command queue</string>
+    <string name="diag_work_next_fmt">next run in %1$s</string>
+    <string name="diag_work_attempts_fmt">%1$d attempts</string>
+    <string name="diag_state_checking">checking</string>
+    <string name="diag_state_enqueued">waiting</string>
+    <string name="diag_state_running">running</string>
+    <string name="diag_state_failed">failed</string>
+    <string name="diag_state_blocked">blocked</string>
+    <string name="diag_state_cancelled">cancelled</string>
+    <string name="diag_state_not_scheduled">not scheduled</string>
+    <string name="diag_report_now_title">Report now</string>
+    <string name="diag_report_now_desc">Runs the status worker immediately, network permitting.</string>
+    <string name="diag_report_now">Run</string>
+    <string name="card_diag_clocks">Claw and phone clocks</string>
+    <string name="diag_clock_phone">Phone last landed</string>
+    <string name="diag_clock_phone_desc">When a full report last reached the claw, by this phone\'s own record.</string>
+    <string name="diag_clock_claw">Claw last heard</string>
+    <string name="diag_clock_claw_desc">When the claw last stamped this device, by its fleet row.</string>
+    <string name="diag_clock_never">never</string>
+    <string name="diag_clock_unreachable">unreachable</string>
+    <string name="diag_callout_unreachable">The claw is unreachable from this phone (%1$s). Reads and reports fail until it is back; nothing is lost — reporting resumes on the next run.</string>
+    <string name="diag_callout_not_landing">This phone is reporting, but the claw is not storing it. The claw is up but degraded — a full disk or a read-only database — or something between them swallows posts.</string>
+    <string name="diag_callout_never_landed">No full report has landed yet. The first run posts everything at once; until then this is normal.</string>
+    <string name="card_diag_checks">Checks</string>
+    <string name="diag_check_ok">ok</string>
+    <string name="diag_check_battery">Battery optimization</string>
+    <string name="diag_check_battery_desc">Unrestricted lets the 15-minute reports survive Doze and OEM app sleeping.</string>
+    <string name="diag_check_battery_fix">Unrestrict</string>
+    <string name="diag_check_background">Background restriction</string>
+    <string name="diag_check_background_desc">Android is blocking all background work for this app until it is lifted.</string>
+    <string name="diag_check_background_fix">Open app settings</string>
+    <string name="diag_check_notifications">Notifications</string>
+    <string name="diag_check_notifications_desc">Needed for the claw\'s alerts and questions to come through.</string>
+    <string name="diag_check_notifications_fix">Open settings</string>
+    <string name="card_diag_log">App log</string>
+    <string name="diag_log_hint">Newest first, last 60 of 200</string>
+    <string name="diag_log_empty">Nothing logged yet. A run appears here within 15 minutes of the app being alive — or tap Report now.</string>
+    <string name="diag_log_copy">Copy</string>
+
     <string name="sessions_group_interactive">Interactive</string>
     <string name="sessions_group_other">Other keys</string>