Fix timer edge cases: thread safety, duplicate dialogs, concurrent timers

- Remove background thread mutation of logbook.logs during merge to
  prevent ConcurrentModificationException crashes
- Cancel ongoing timer when user enters manual duration to prevent
  orphaned ongoing events
- Prevent duplicate timer dialogs when tapping ongoing event in list
- Block starting a second timer while another is already running
- Track old fingerprint on event edit to prevent merge re-adding
  the old version

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt

@@ -329,18 +329,38 @@ class MainActivity : AppCompatActivity() {
     }
 
     fun startBreastfeedingTimer(eventType: String) {
-        // Check if timer already running
+        // Check if timer already running locally
         if (bfTimerType != null) {
             Toast.makeText(this, R.string.breastfeeding_timer_already_running, Toast.LENGTH_SHORT).show()
             return
         }
+        if (sleepTimerStartTime > 0) {
+            Toast.makeText(this, R.string.another_timer_already_running, Toast.LENGTH_SHORT).show()
+            return
+        }
 
-        // Save timer state
-        bfTimerStartTime = System.currentTimeMillis()
+        // Check logbook for existing ongoing breastfeeding event (from another device)
+        val existingOngoing = logbook?.logs?.let { LunaEvent.findOngoingBreastfeeding(it) }
+        if (existingOngoing != null) {
+            bfTimerStartTime = existingOngoing.time * 1000
+            bfTimerType = existingOngoing.type
+            saveBreastfeedingTimerState()
+            showBreastfeedingTimerDialog(existingOngoing.type)
+            return
+        }
+
+        // Create ongoing event and save to logbook (syncs via WebDAV)
+        val event = LunaEvent(eventType)
+        event.ongoing = true
+        event.signature = signature
+        bfTimerStartTime = event.time * 1000
         bfTimerType = eventType
         saveBreastfeedingTimerState()
 
-        // Show timer dialog
+        logbook?.logs?.add(0, event)
+        recyclerView.adapter?.notifyItemInserted(0)
+        saveLogbook()
+
         showBreastfeedingTimerDialog(eventType)
     }
 
@@ -383,13 +403,19 @@ class MainActivity : AppCompatActivity() {
     fun stopBreastfeedingTimer() {
         bfTimerHandler?.removeCallbacks(bfTimerRunnable!!)
 
-        val durationMillis = System.currentTimeMillis() - bfTimerStartTime
-        val durationMinutes = Math.max(1, (durationMillis / 60000).toInt()) // Minimum 1 minute
-
+        val ongoingEvent = logbook?.logs?.let { LunaEvent.findOngoingBreastfeeding(it) }
         val eventType = bfTimerType
         clearBreastfeedingTimerState()
 
-        if (eventType != null) {
+        if (ongoingEvent != null) {
+            ongoingEvent.finalizeOngoing(System.currentTimeMillis())
+            logbook?.sort()
+            recyclerView.adapter?.notifyDataSetChanged()
+            saveLogbook()
+        } else if (eventType != null) {
+            // Fallback: no ongoing event found (sync issue), create event the old way
+            val durationMillis = System.currentTimeMillis() - bfTimerStartTime
+            val durationMinutes = Math.max(1, (durationMillis / 60000).toInt())
             logEvent(LunaEvent(eventType, durationMinutes))
         }
     }
@@ -397,9 +423,23 @@ class MainActivity : AppCompatActivity() {
     fun cancelBreastfeedingTimer() {
         bfTimerHandler?.removeCallbacks(bfTimerRunnable!!)
         clearBreastfeedingTimerState()
+
+        // Remove ongoing event from logbook
+        val ongoingEvent = logbook?.logs?.let { LunaEvent.findOngoingBreastfeeding(it) }
+        if (ongoingEvent != null) {
+            logbook?.removedSinceLoad?.add(ongoingEvent.fingerprint())
+            logbook?.logs?.remove(ongoingEvent)
+            recyclerView.adapter?.notifyDataSetChanged()
+            saveLogbook()
+        }
     }
 
     fun askBreastfeedingDuration(eventType: String) {
+        // Cancel any running timer to avoid orphaned ongoing events
+        if (bfTimerType != null) {
+            cancelBreastfeedingTimer()
+        }
+
         val d = AlertDialog.Builder(this)
         val dialogView = layoutInflater.inflate(R.layout.breastfeeding_duration_dialog, null)
         d.setTitle(R.string.breastfeeding_duration_title)
@@ -443,17 +483,36 @@ class MainActivity : AppCompatActivity() {
 
     // Sleep timer methods
     fun startSleepTimer() {
-        // Check if timer already running
+        // Check if timer already running locally
         if (sleepTimerStartTime > 0) {
             Toast.makeText(this, R.string.sleep_timer_already_running, Toast.LENGTH_SHORT).show()
             return
         }
+        if (bfTimerType != null) {
+            Toast.makeText(this, R.string.another_timer_already_running, Toast.LENGTH_SHORT).show()
+            return
+        }
 
-        // Save timer state
-        sleepTimerStartTime = System.currentTimeMillis()
+        // Check logbook for existing ongoing sleep event (from another device)
+        val existingOngoing = logbook?.logs?.let { LunaEvent.findOngoing(it, LunaEvent.TYPE_SLEEP) }
+        if (existingOngoing != null) {
+            sleepTimerStartTime = existingOngoing.time * 1000
+            saveSleepTimerState()
+            showSleepTimerDialog()
+            return
+        }
+
+        // Create ongoing event and save to logbook (syncs via WebDAV)
+        val event = LunaEvent(LunaEvent.TYPE_SLEEP)
+        event.ongoing = true
+        event.signature = signature
+        sleepTimerStartTime = event.time * 1000
         saveSleepTimerState()
 
-        // Show timer dialog
+        logbook?.logs?.add(0, event)
+        recyclerView.adapter?.notifyItemInserted(0)
+        saveLogbook()
+
         showSleepTimerDialog()
     }
 
@@ -499,20 +558,42 @@ class MainActivity : AppCompatActivity() {
     fun stopSleepTimer() {
         sleepTimerHandler?.removeCallbacks(sleepTimerRunnable!!)
 
-        val durationMillis = System.currentTimeMillis() - sleepTimerStartTime
-        val durationMinutes = Math.max(1, (durationMillis / 60000).toInt()) // Minimum 1 minute
-
+        val ongoingEvent = logbook?.logs?.let { LunaEvent.findOngoing(it, LunaEvent.TYPE_SLEEP) }
         clearSleepTimerState()
 
-        logEvent(LunaEvent(LunaEvent.TYPE_SLEEP, durationMinutes))
+        if (ongoingEvent != null) {
+            ongoingEvent.finalizeOngoing(System.currentTimeMillis())
+            logbook?.sort()
+            recyclerView.adapter?.notifyDataSetChanged()
+            saveLogbook()
+        } else {
+            // Fallback: no ongoing event found (sync issue), create event the old way
+            val durationMillis = System.currentTimeMillis() - sleepTimerStartTime
+            val durationMinutes = Math.max(1, (durationMillis / 60000).toInt())
+            logEvent(LunaEvent(LunaEvent.TYPE_SLEEP, durationMinutes))
+        }
     }
 
     fun cancelSleepTimer() {
         sleepTimerHandler?.removeCallbacks(sleepTimerRunnable!!)
         clearSleepTimerState()
+
+        // Remove ongoing event from logbook
+        val ongoingEvent = logbook?.logs?.let { LunaEvent.findOngoing(it, LunaEvent.TYPE_SLEEP) }
+        if (ongoingEvent != null) {
+            logbook?.removedSinceLoad?.add(ongoingEvent.fingerprint())
+            logbook?.logs?.remove(ongoingEvent)
+            recyclerView.adapter?.notifyDataSetChanged()
+            saveLogbook()
+        }
     }
 
     fun askSleepDuration() {
+        // Cancel any running timer to avoid orphaned ongoing events
+        if (sleepTimerStartTime > 0) {
+            cancelSleepTimer()
+        }
+
         val d = AlertDialog.Builder(this)
         val dialogView = layoutInflater.inflate(R.layout.sleep_duration_dialog, null)
         d.setTitle(R.string.sleep_duration_title)
@@ -829,6 +910,27 @@ class MainActivity : AppCompatActivity() {
     }
 
     fun showEventDetailDialog(event: LunaEvent, items: ArrayList<LunaEvent>) {
+        // If event is ongoing, show the appropriate timer dialog instead
+        if (event.ongoing) {
+            if (event.type in LunaEvent.BREASTFEEDING_TYPES) {
+                if (bfTimerDialog?.isShowing == true) return
+                if (bfTimerType == null) {
+                    bfTimerStartTime = event.time * 1000
+                    bfTimerType = event.type
+                    saveBreastfeedingTimerState()
+                }
+                showBreastfeedingTimerDialog(event.type)
+            } else if (event.type == LunaEvent.TYPE_SLEEP) {
+                if (sleepTimerDialog?.isShowing == true) return
+                if (sleepTimerStartTime == 0L) {
+                    sleepTimerStartTime = event.time * 1000
+                    saveSleepTimerState()
+                }
+                showSleepTimerDialog()
+            }
+            return
+        }
+
         // Do not update list while the detail is shown, to avoid changing the object below while it is changed by the user
         pauseLogbookUpdate = true
         val d = AlertDialog.Builder(this)
@@ -857,6 +959,8 @@ class MainActivity : AppCompatActivity() {
                 TimePickerDialog(this, { _, hour, minute ->
                     val pickedDateTime = Calendar.getInstance()
                     pickedDateTime.set(year, month, day, hour, minute)
+                    // Track old fingerprint so merge doesn't re-add the old version
+                    logbook?.removedSinceLoad?.add(event.fingerprint())
                     // Save event and move it to the right position in the logbook
                     event.time = pickedDateTime.time.time / 1000 // Seconds since epoch
                     dateTextView.text = String.format(getString(R.string.dialog_event_detail_datetime_icon), DateUtils.formatDateTime(event.time))
@@ -898,6 +1002,8 @@ class MainActivity : AppCompatActivity() {
                 pickerDialog.setPositiveButton(android.R.string.ok) { _, _ ->
                     val newQuantity = picker.value
                     if (newQuantity != oldQuantity) {
+                        // Track old fingerprint so merge doesn't re-add the old version
+                        logbook?.removedSinceLoad?.add(event.fingerprint())
                         // Adjust end time based on duration change (duration reduced = end time earlier)
                         event.time = event.time - (oldQuantity - newQuantity) * 60L
                         event.quantity = newQuantity
@@ -1225,6 +1331,7 @@ class MainActivity : AppCompatActivity() {
                     findViewById<View>(R.id.no_connection_screen).visibility = View.GONE
                     logbook = lb
                     showLogbook()
+                    checkForOngoingEvents()
 
                     if (DEBUG_CHECK_LOGBOOK_CONSISTENCY) {
                         for (e in logbook?.logs ?: listOf()) {
@@ -1283,6 +1390,71 @@ class MainActivity : AppCompatActivity() {
         })
     }
 
+    fun checkForOngoingEvents() {
+        val logs = logbook?.logs ?: return
+        val now = System.currentTimeMillis() / 1000
+        val maxOngoingSeconds = 24 * 60 * 60 // 24 hours
+
+        // Check for stale ongoing events (>24h)
+        for (event in logs.toList()) {
+            if (event.ongoing && (now - event.time) > maxOngoingSeconds) {
+                showStaleTimerDialog(event)
+                return
+            }
+        }
+
+        // Breastfeeding timer sync
+        val ongoingBf = LunaEvent.findOngoingBreastfeeding(logs)
+        if (bfTimerType == null) {
+            // Adopt ongoing timer from another device
+            if (ongoingBf != null) {
+                bfTimerStartTime = ongoingBf.time * 1000
+                bfTimerType = ongoingBf.type
+                saveBreastfeedingTimerState()
+                showBreastfeedingTimerDialog(ongoingBf.type)
+            }
+        } else if (ongoingBf == null) {
+            // Timer running locally but cancelled/stopped on other device
+            bfTimerHandler?.removeCallbacks(bfTimerRunnable!!)
+            bfTimerDialog?.dismiss()
+            clearBreastfeedingTimerState()
+        }
+
+        // Sleep timer sync
+        val ongoingSleep = LunaEvent.findOngoing(logs, LunaEvent.TYPE_SLEEP)
+        if (sleepTimerStartTime == 0L) {
+            // Adopt ongoing timer from another device
+            if (ongoingSleep != null) {
+                sleepTimerStartTime = ongoingSleep.time * 1000
+                saveSleepTimerState()
+                showSleepTimerDialog()
+            }
+        } else if (ongoingSleep == null) {
+            // Timer running locally but cancelled/stopped on other device
+            sleepTimerDialog?.dismiss()
+            clearSleepTimerState()
+        }
+    }
+
+    fun showStaleTimerDialog(event: LunaEvent) {
+        val d = AlertDialog.Builder(this)
+        d.setTitle(R.string.stale_timer_title)
+        d.setMessage(R.string.stale_timer_message)
+        d.setPositiveButton(R.string.stale_timer_finalize) { _, _ ->
+            event.finalizeOngoing(System.currentTimeMillis())
+            logbook?.sort()
+            recyclerView.adapter?.notifyDataSetChanged()
+            saveLogbook()
+        }
+        d.setNegativeButton(R.string.stale_timer_delete) { _, _ ->
+            logbook?.removedSinceLoad?.add(event.fingerprint())
+            logbook?.logs?.remove(event)
+            recyclerView.adapter?.notifyDataSetChanged()
+            saveLogbook()
+        }
+        d.create().show()
+    }
+
     fun logEvent(event: LunaEvent) {
         savingEvent(true)
 
@@ -1306,6 +1478,7 @@ class MainActivity : AppCompatActivity() {
 
         // Update data
         setLoading(true)
+        logbook?.removedSinceLoad?.add(event.fingerprint())
         logbook?.logs?.remove(event)
         recyclerView.adapter?.notifyDataSetChanged()
         saveLogbook()

app/src/main/java/it/danieleverducci/lunatracker/adapters/LunaEventRecyclerAdapter.kt

@@ -59,6 +59,21 @@ class LunaEventRecyclerAdapter: RecyclerView.Adapter<LunaEventRecyclerAdapter.Lu
             LunaEvent.TYPE_CUSTOM -> item.notes
             else -> item.getTypeDescription(context)
         }
+        if (item.ongoing) {
+            // Show ongoing timer info
+            val elapsedSeconds = (System.currentTimeMillis() / 1000) - item.time
+            val minutes = elapsedSeconds / 60
+            val hours = minutes / 60
+            holder.time.text = if (hours > 0) {
+                String.format("%dh %02dm", hours, minutes % 60)
+            } else {
+                String.format("%d min", minutes)
+            }
+            holder.quantity.text = context.getString(R.string.event_ongoing)
+            holder.quantity.setTextColor(ContextCompat.getColor(context, R.color.accent))
+            return
+        }
+
         holder.time.text = DateUtils.formatTimeAgo(context, item.time)
         var quantityText = numericUtils.formatEventQuantity(item)
 

app/src/main/java/it/danieleverducci/lunatracker/entities/Logbook.kt

@@ -5,6 +5,7 @@ class Logbook(val name: String) {
         const val MAX_SAFE_LOGBOOK_SIZE = 30000
     }
     val logs = ArrayList<LunaEvent>()
+    val removedSinceLoad = mutableSetOf<String>()
 
     fun isTooBig(): Boolean {
         return logs.size > MAX_SAFE_LOGBOOK_SIZE

app/src/main/java/it/danieleverducci/lunatracker/entities/LunaEvent.kt

@@ -31,6 +31,20 @@ class LunaEvent: Comparable<LunaEvent> {
         const val TYPE_PUKE = "PUKE"
         const val TYPE_BATH = "BATH"
         const val TYPE_SLEEP = "SLEEP"
+
+        val BREASTFEEDING_TYPES = listOf(
+            TYPE_BREASTFEEDING_LEFT_NIPPLE,
+            TYPE_BREASTFEEDING_BOTH_NIPPLE,
+            TYPE_BREASTFEEDING_RIGHT_NIPPLE
+        )
+
+        fun findOngoing(events: List<LunaEvent>, type: String): LunaEvent? {
+            return events.firstOrNull { it.ongoing && it.type == type }
+        }
+
+        fun findOngoingBreastfeeding(events: List<LunaEvent>): LunaEvent? {
+            return events.firstOrNull { it.ongoing && it.type in BREASTFEEDING_TYPES }
+        }
     }
 
     private val jo: JSONObject
@@ -62,6 +76,14 @@ class LunaEvent: Comparable<LunaEvent> {
             if (value.isNotEmpty())
                 jo.put("signature", value)
         }
+    var ongoing: Boolean
+        get() = jo.optInt("ongoing", 0) == 1
+        set(value) {
+            if (value)
+                jo.put("ongoing", 1)
+            else
+                jo.remove("ongoing")
+        }
 
     constructor(jo: JSONObject) {
         this.jo = jo
@@ -138,6 +160,29 @@ class LunaEvent: Comparable<LunaEvent> {
         }
     }
 
+    fun fingerprint(): String {
+        return "${time}_${type}_${quantity}_${notes}_${signature}_${ongoing}"
+    }
+
+    /**
+     * Returns the approximate start time for timer events.
+     * For ongoing events: time IS the start time.
+     * For finalized events: start = time - quantity * 60 (time=end, quantity=duration in min).
+     */
+    fun approximateStartTime(): Long {
+        return if (ongoing) time else time - quantity * 60L
+    }
+
+    fun finalizeOngoing(endTimeMillis: Long) {
+        if (!ongoing) return
+        val startTimeSeconds = this.time
+        val endTimeSeconds = endTimeMillis / 1000
+        val durationMinutes = Math.max(1, ((endTimeSeconds - startTimeSeconds) / 60).toInt())
+        this.time = endTimeSeconds
+        this.quantity = durationMinutes
+        this.ongoing = false
+    }
+
     fun toJson(): JSONObject {
         return jo
     }

app/src/main/java/it/danieleverducci/lunatracker/repository/WebDAVLogbookRepository.kt

@@ -133,21 +133,125 @@ class WebDAVLogbookRepository(val webDavURL: String, val username: String, val p
     }
 
     private fun saveLogbook(context: Context, logbook: Logbook) {
-        // Lock logbook on WebDAV to avoid concurrent changes
-        //sardine.lock(getUrl())
-        // Reload logbook from WebDAV
-        // Merge logbooks (based on time)
-        // Write logbook
-        // Unlock logbook on WebDAV
-        //sardine.unlock(getUrl())
+        // Take a snapshot of local events (UI thread may modify logbook.logs concurrently)
+        val localSnapshot = ArrayList(logbook.logs)
+        val removedFingerprints = HashSet(logbook.removedSinceLoad)
+
+        // Load remote logbook and merge before saving to avoid overwriting
+        // events added by other devices
+        val mergedEvents = ArrayList(localSnapshot)
+        try {
+            val remoteLogbook = loadLogbook(logbook.name)
+            val added = mergeRemoteEvents(mergedEvents, remoteLogbook, removedFingerprints)
+            if (added > 0) {
+                Log.d(TAG, "Merged $added remote events, saving ${mergedEvents.size} total")
+            }
+            // Merged events will appear in UI on next periodic load (max 60s)
+        } catch (e: Exception) {
+            // Remote not available (404, network error, etc.) - save local version as-is
+            Log.w(TAG, "Could not load remote logbook for merge: $e")
+        }
 
         val ja = JSONArray()
-        for (l in logbook.logs) {
+        for (l in mergedEvents) {
             ja.put(l.toJson())
         }
         sardine.put(getUrl(logbook.name), ja.toString().toByteArray())
     }
 
+    /**
+     * Merges remote events into the local event list.
+     * - Events already in local (by fingerprint) are skipped
+     * - Events in removedSinceLoad are skipped (deliberately deleted/cancelled locally)
+     * - Ongoing events that were finalized locally are skipped
+     * - Duplicate finalized timer events (same type + similar start time) are skipped
+     * @return number of events added
+     */
+    private fun mergeRemoteEvents(
+        localEvents: ArrayList<LunaEvent>,
+        remote: Logbook,
+        removedFingerprints: Set<String>
+    ): Int {
+        val localFingerprints = localEvents.map { it.fingerprint() }.toHashSet()
+        var added = 0
+
+        for (remoteEvent in remote.logs) {
+            val fingerprint = remoteEvent.fingerprint()
+
+            // Already exists locally with exact same state
+            if (localFingerprints.contains(fingerprint)) {
+                continue
+            }
+
+            // Was deliberately removed locally (cancel/delete)
+            if (removedFingerprints.contains(fingerprint)) {
+                continue
+            }
+
+            // Remote ongoing event was finalized locally
+            if (remoteEvent.ongoing && hasMatchingTimerEvent(remoteEvent, localEvents)) {
+                continue
+            }
+
+            // Remote finalized timer event that duplicates a local one
+            // (both devices stopped the same timer → slightly different end times)
+            if (!remoteEvent.ongoing && isDuplicateTimerEvent(remoteEvent, localEvents)) {
+                continue
+            }
+
+            localEvents.add(remoteEvent)
+            localFingerprints.add(fingerprint)
+            added++
+        }
+
+        if (added > 0) {
+            localEvents.sortWith(compareByDescending { it.time })
+        }
+        return added
+    }
+
+    /**
+     * Checks if there's a local timer event (ongoing or finalized) with
+     * approximately the same start time as the given event.
+     */
+    private fun hasMatchingTimerEvent(event: LunaEvent, localEvents: List<LunaEvent>): Boolean {
+        val startTime = event.approximateStartTime()
+        for (local in localEvents) {
+            if (local.type != event.type) continue
+            if (Math.abs(startTime - local.approximateStartTime()) < 120) {
+                return true
+            }
+        }
+        return false
+    }
+
+    /**
+     * Checks if a finalized timer event is a duplicate of an existing local event
+     * (same timer stopped on two devices → slightly different end times).
+     * Only applies to timer-type events (sleep, breastfeeding) with duration > 0.
+     */
+    private fun isDuplicateTimerEvent(event: LunaEvent, localEvents: List<LunaEvent>): Boolean {
+        if (event.quantity <= 0) return false
+        val timerTypes = setOf(
+            LunaEvent.TYPE_SLEEP,
+            LunaEvent.TYPE_BREASTFEEDING_LEFT_NIPPLE,
+            LunaEvent.TYPE_BREASTFEEDING_BOTH_NIPPLE,
+            LunaEvent.TYPE_BREASTFEEDING_RIGHT_NIPPLE
+        )
+        if (event.type !in timerTypes) return false
+
+        val startTime = event.approximateStartTime()
+        for (local in localEvents) {
+            if (local.ongoing) continue
+            if (local.type != event.type) continue
+            if (local.quantity <= 0) continue
+            if (Math.abs(startTime - local.approximateStartTime()) < 120) {
+                return true
+            }
+        }
+        return false
+    }
+
     /**
      * Connect to server and check if a logbook already exists.
      * If it does not exist, try to upload the local one.

app/src/main/java/utils/StatisticsCalculator.kt

@@ -79,14 +79,14 @@ class StatisticsCalculator(private val events: List<LunaEvent>) {
     }
 
     private fun getEventsInRange(startUnix: Long, endUnix: Long): List<LunaEvent> {
-        return events.filter { it.time >= startUnix && it.time < endUnix }
+        return events.filter { it.time >= startUnix && it.time < endUnix && !it.ongoing }
     }
 
     private fun getEventsForDays(days: Int): List<LunaEvent> {
         val now = System.currentTimeMillis() / 1000
         val startOfToday = getStartOfDay(now)
         val startTime = startOfToday - (days - 1) * 24 * 60 * 60
-        return events.filter { it.time >= startTime }
+        return events.filter { it.time >= startTime && !it.ongoing }
     }
 
     /**

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

@@ -104,6 +104,7 @@
     <string name="breastfeeding_timer_stop">Stopp</string>
     <string name="breastfeeding_timer_hint">Tippe Stopp wenn fertig</string>
     <string name="breastfeeding_timer_already_running">Es läuft bereits eine Stillsitzung</string>
+    <string name="another_timer_already_running">Es läuft bereits ein anderer Timer</string>
     <string name="breastfeeding_duration_title">Stilldauer</string>
     <string name="breastfeeding_duration_description">Dauer in Minuten eingeben</string>
 
@@ -236,6 +237,13 @@
     <string name="import_success">%d Ereignisse importiert</string>
     <string name="import_error">Import fehlgeschlagen</string>
 
+    <!-- Laufende Events (geräteübergreifende Timer-Synchronisierung) -->
+    <string name="event_ongoing">läuft…</string>
+    <string name="stale_timer_title">Abgelaufener Timer</string>
+    <string name="stale_timer_message">Ein Timer läuft seit über 24 Stunden. Wurde er vergessen?</string>
+    <string name="stale_timer_finalize">Mit aktueller Dauer speichern</string>
+    <string name="stale_timer_delete">Löschen</string>
+
     <!-- Logbook-Verwaltung -->
     <string name="edit_logbook_title">Logbook bearbeiten</string>
     <string name="edit_logbook_name_hint">Logbook-Name</string>

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

@@ -104,6 +104,7 @@
     <string name="breastfeeding_timer_stop">Arrêter</string>
     <string name="breastfeeding_timer_hint">Appuyez sur Arrêter quand terminé</string>
     <string name="breastfeeding_timer_already_running">Une session d\'allaitement est déjà en cours</string>
+    <string name="another_timer_already_running">Un autre minuteur est déjà en cours</string>
     <string name="breastfeeding_duration_title">Durée d\'allaitement</string>
     <string name="breastfeeding_duration_description">Entrez la durée en minutes</string>
 
@@ -204,6 +205,13 @@
     <string name="import_success">%d événements importés</string>
     <string name="import_error">Échec de l\'import</string>
 
+    <!-- Événements en cours (synchronisation minuterie inter-appareils) -->
+    <string name="event_ongoing">en cours…</string>
+    <string name="stale_timer_title">Minuterie expirée</string>
+    <string name="stale_timer_message">Une minuterie est active depuis plus de 24 heures. A-t-elle été oubliée ?</string>
+    <string name="stale_timer_finalize">Enregistrer avec la durée actuelle</string>
+    <string name="stale_timer_delete">Supprimer</string>
+
     <!-- Gestion du journal -->
     <string name="edit_logbook_title">Modifier le journal</string>
     <string name="edit_logbook_name_hint">Nom du journal</string>

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

@@ -104,6 +104,7 @@
     <string name="breastfeeding_timer_stop">Stop</string>
     <string name="breastfeeding_timer_hint">Premi Stop quando hai finito</string>
     <string name="breastfeeding_timer_already_running">Una sessione di allattamento è già in corso</string>
+    <string name="another_timer_already_running">Un altro timer è già in corso</string>
     <string name="breastfeeding_duration_title">Durata allattamento</string>
     <string name="breastfeeding_duration_description">Inserisci la durata in minuti</string>
 
@@ -204,6 +205,13 @@
     <string name="import_success">%d eventi importati</string>
     <string name="import_error">Importazione fallita</string>
 
+    <!-- Eventi in corso (sincronizzazione timer tra dispositivi) -->
+    <string name="event_ongoing">in corso…</string>
+    <string name="stale_timer_title">Timer scaduto</string>
+    <string name="stale_timer_message">Un timer è attivo da oltre 24 ore. È stato dimenticato?</string>
+    <string name="stale_timer_finalize">Salva con la durata attuale</string>
+    <string name="stale_timer_delete">Elimina</string>
+
     <!-- Gestione diario -->
     <string name="edit_logbook_title">Modifica diario</string>
     <string name="edit_logbook_name_hint">Nome del diario</string>

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

@@ -162,6 +162,7 @@
     <string name="breastfeeding_timer_stop">Stop</string>
     <string name="breastfeeding_timer_hint">Tap Stop when finished</string>
     <string name="breastfeeding_timer_already_running">A breastfeeding session is already in progress</string>
+    <string name="another_timer_already_running">Another timer is already running</string>
     <string name="breastfeeding_duration_title">Breastfeeding duration</string>
     <string name="breastfeeding_duration_description">Enter the duration in minutes</string>
     <string name="measurement_unit_time_minutes" translatable="false">min</string>
@@ -262,6 +263,13 @@
     <string name="import_success">Imported %d events</string>
     <string name="import_error">Import failed</string>
 
+    <!-- Ongoing events (cross-device timer sync) -->
+    <string name="event_ongoing">running…</string>
+    <string name="stale_timer_title">Expired timer</string>
+    <string name="stale_timer_message">A timer has been running for more than 24 hours. Was it forgotten?</string>
+    <string name="stale_timer_finalize">Save with current duration</string>
+    <string name="stale_timer_delete">Delete</string>
+
     <!-- Logbook management -->
     <string name="edit_logbook_title">Edit Logbook</string>
     <string name="edit_logbook_name_hint">Logbook name</string>