diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8f2e14..c7da0f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,21 @@ Dashboard sizing, Program progress contrast, chart proportions, duration
 coverage messaging, and the right-aligned Settings/Sync action cluster are
 also refined.
 
+- Restored automatic Sleep-only Bluetooth synchronization after a real-night
+  trace exposed several restart and first-import gaps. The user-service
+  installer now removes only its obsolete `syncd` ExecStart override and
+  installs the RFCOMM agent;
+  Android resumes the same unsuperseded immutable generation across a new
+  conversation run and accepts its exact generation/digest ACK even though
+  the immutable ACK retains the original run identity. Ledger-proven
+  superseded branches remain retained without exhausting admission. Desktop
+  progress validation accepts the existing ACK-recovery phase, and a fresh
+  desktop can seed a non-root Sleep V2 current snapshot when its validated
+  ancestry is present. Regression
+  coverage carries medication quantity, Couché/Réveil/Levé and Sleep BPM/RR
+  through import, ACK, replay and a second Sleep-only generation with no
+  Android workout session.
+
 ## 0.1.5 — 2026-09-23
 
 - Completed the Sleep Tonight readiness delta and its non-destructive private
diff --git a/android/app/src/main/java/com/labfytools/trainlog/data/BluetoothSyncTransport.kt b/android/app/src/main/java/com/labfytools/trainlog/data/BluetoothSyncTransport.kt
index 66eb3d1..47f656f 100644
--- a/android/app/src/main/java/com/labfytools/trainlog/data/BluetoothSyncTransport.kt
+++ b/android/app/src/main/java/com/labfytools/trainlog/data/BluetoothSyncTransport.kt
@@ -101,6 +101,19 @@ internal fun hasBluetoothConnectPermission(context: Context): Boolean =
         ContextCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) ==
         PackageManager.PERMISSION_GRANTED
 
+/**
+ * Decide whether a newly connected RFCOMM peer may publish an automatic request.
+ *
+ * WHY: Sleep-only changes have no workout event to wake the desktop path, so
+ * Bluetooth arrival itself must remain the trigger. CONTRACT: user opt-in and
+ * the existing cooldown are both mandatory. INVARIANT: reconnection never
+ * bypasses the bounded request cadence or requires an explicit UI action.
+ */
+internal fun shouldPublishBluetoothArrivalRequest(
+    autoSyncEnabled: Boolean,
+    cooldownReady: Boolean,
+): Boolean = autoSyncEnabled && cooldownReady
+
 @SuppressLint("MissingPermission")
 internal fun bondedBluetoothDesktops(context: Context): List<BondedBluetoothDesktop> {
     if (!hasBluetoothConnectPermission(context)) return emptyList()
@@ -526,9 +539,15 @@ internal class BluetoothSyncClient(
     }
 
     private fun publishArrivalRequest() {
-        if (!BackgroundSyncSettings(context).enabled) return
         val now = System.currentTimeMillis()
-        if (!settings.shouldPublishAutomaticRequest(now)) return
+        if (
+            !shouldPublishBluetoothArrivalRequest(
+                BackgroundSyncSettings(context).enabled,
+                settings.shouldPublishAutomaticRequest(now),
+            )
+        ) {
+            return
+        }
         val directory = canonicalExchangeDirectory()
         if (!directory.isDirectory) return
         val coordinator =
diff --git a/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationForegroundCoordinator.kt b/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationForegroundCoordinator.kt
index 2f6e18f..efff13d 100644
--- a/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationForegroundCoordinator.kt
+++ b/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationForegroundCoordinator.kt
@@ -45,6 +45,13 @@ internal object AndroidSyncGenerationTrace : SyncGenerationTrace {
     }
 }
 
+internal fun acknowledgementMatchesCapturedGeneration(
+    acknowledgement: JSONObject,
+    captured: CapturedSyncGeneration,
+): Boolean =
+    acknowledgement.optString("generation_id") == captured.generationId &&
+        acknowledgement.optString("manifest_sha256") == captured.manifestSha256
+
 /** Owns the bounded, user-initiated Android side of a generation conversation. */
 internal class SyncGenerationCoordinator(
     private val repository: TrainlogRepository,
@@ -69,15 +76,9 @@ internal class SyncGenerationCoordinator(
 
     internal fun resumableGeneration(runId: String, consumerPeerId: String? = null): CapturedSyncGeneration? =
         repository.inSyncGenerationTransaction { db ->
-            db.rawQuery(
-                "SELECT generation_id,manifest_sha256,staging_path FROM sync_generations " +
-                    "WHERE run_id=? AND (status IN('captured','published','waiting_acknowledgement') " +
-                    "OR (status='acknowledged' AND NOT EXISTS(" +
-                    "SELECT 1 FROM sync_consumed_generations c WHERE c.run_id=sync_generations.run_id " +
-                    "AND c.result IN('consumed','rejected')))) " +
-                    (if (consumerPeerId == null) "" else "AND consumer_peer_id=? ") +
-                    "LIMIT 2",
-                if (consumerPeerId == null) arrayOf(runId) else arrayOf(runId, consumerPeerId),
+            fun query(sql: String, arguments: Array<String>): CapturedSyncGeneration? = db.rawQuery(
+                sql,
+                arguments,
             ).use { cursor ->
                 if (!cursor.moveToFirst()) null
                 else {
@@ -93,6 +94,29 @@ internal class SyncGenerationCoordinator(
                     captured
                 }
             }
+            query(
+                "SELECT generation_id,manifest_sha256,staging_path FROM sync_generations " +
+                    "WHERE run_id=? AND (status IN('captured','published','waiting_acknowledgement') " +
+                    "OR (status='acknowledged' AND NOT EXISTS(" +
+                    "SELECT 1 FROM sync_consumed_generations c WHERE c.run_id=sync_generations.run_id " +
+                    "AND c.result IN('consumed','rejected')))) " +
+                    (if (consumerPeerId == null) "" else "AND consumer_peer_id=? ") +
+                    "LIMIT 2",
+                if (consumerPeerId == null) arrayOf(runId) else arrayOf(runId, consumerPeerId),
+            ) ?: if (consumerPeerId == null) null else query(
+                /* WHY: an RFCOMM reset creates a new conversation run while
+                 * the immutable generation still awaits its correlated ACK.
+                 * CONTRACT: resume only the unsuperseded generation for the
+                 * same peer; the reference adopts the new run while manifest
+                 * and generation identity remain unchanged. */
+                "SELECT g.generation_id,g.manifest_sha256,g.staging_path FROM sync_generations g " +
+                    "WHERE g.consumer_peer_id=? AND g.status IN('captured','published','waiting_acknowledgement') " +
+                    "AND NOT EXISTS(SELECT 1 FROM sync_generations sibling JOIN sync_acknowledgements a " +
+                    "ON a.generation_id=sibling.generation_id WHERE sibling.parent_generation_id=g.parent_generation_id " +
+                    "AND sibling.generation_id<>g.generation_id AND sibling.status='acknowledged') " +
+                    "ORDER BY g.generated_at DESC LIMIT 2",
+                arrayOf(consumerPeerId),
+            )
         }
 
     private fun request(directory: File): JSONObject? {
@@ -570,12 +594,15 @@ internal class SyncGenerationCoordinator(
             afterPublication?.invoke()
             lease.throwIfYieldRequested()
             // CONTRACT: durable objects from earlier conversations remain in
-            // the exchange directory. Only this run's exact generation ACK
-            // can advance its lineage; stale bytes are retained and ignored.
+            // the exchange directory. A cross-run retry preserves the
+            // immutable manifest's original run_id, so correlate its ACK by
+            // generation identity and manifest digest. acceptAcknowledgement
+            // then revalidates the complete durable ACK against SQLite.
+            // INVARIANT: unrelated or same-ID/different-bytes ACKs remain
+            // ignored; an exact replay is deliberately accepted.
             val desktopAck =
                 awaitCorrelated(File(directory, "desktop-consumption-ack-v1.json"), deadline, {
-                    it.optString("run_id") == captured.runId &&
-                        it.optString("generation_id") == captured.generationId
+                    acknowledgementMatchesCapturedGeneration(it, captured)
                 }, pollTransport, lease)
             service.acceptAcknowledgement(desktopAck)
             phase(runId, "desktop_ack_observed", "desktop-consumption-ack-v1.json", captured.generationId)
diff --git a/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationService.kt b/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationService.kt
index fa099ed..cec70eb 100644
--- a/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationService.kt
+++ b/android/app/src/main/java/com/labfytools/trainlog/data/SyncGenerationService.kt
@@ -299,12 +299,18 @@ internal class SyncGenerationService(private val repository: TrainlogRepository)
                      * ledger row. Such terminal rows cannot be archived
                      * safely because Trainlog must not fabricate evidence,
                      * but they must not exhaust the active admission window
-                     * forever. Current acknowledgements always have durable
-                     * ledger evidence and remain counted until archived.
-                     * INVARIANT: captured, published and unacknowledged rows
-                     * are always retained and never pruned for capacity. */
+                     * forever. A failed conversation can also leave an
+                     * unacknowledged branch whose sibling later receives a
+                     * durable ACK; that superseded branch remains retained
+                     * for audit but can never be the causal tip. INVARIANT:
+                     * only a ledger-backed acknowledged sibling proves that
+                     * an unacknowledged branch no longer consumes admission. */
                     "SELECT COUNT(*) FROM sync_generations g WHERE consumer_peer_id=? AND " +
-                        "(status IN('captured','published','waiting_acknowledgement') OR " +
+                        "((status IN('captured','published','waiting_acknowledgement') AND NOT EXISTS(" +
+                        "SELECT 1 FROM sync_generations sibling JOIN sync_acknowledgements sibling_ack " +
+                        "ON sibling_ack.generation_id=sibling.generation_id WHERE " +
+                        "sibling.parent_generation_id=g.parent_generation_id AND " +
+                        "sibling.generation_id<>g.generation_id AND sibling.status='acknowledged')) OR " +
                         "(status='acknowledged' AND EXISTS(SELECT 1 FROM sync_acknowledgements k " +
                         "WHERE k.generation_id=g.generation_id))) AND NOT EXISTS(" +
                         "SELECT 1 FROM sync_generation_archives a WHERE a.generation_id=g.generation_id)",
diff --git a/android/app/src/test/java/com/labfytools/trainlog/data/BluetoothSyncTransportContractTest.kt b/android/app/src/test/java/com/labfytools/trainlog/data/BluetoothSyncTransportContractTest.kt
index 55aef0c..46e09b1 100644
--- a/android/app/src/test/java/com/labfytools/trainlog/data/BluetoothSyncTransportContractTest.kt
+++ b/android/app/src/test/java/com/labfytools/trainlog/data/BluetoothSyncTransportContractTest.kt
@@ -1,9 +1,32 @@
 package com.labfytools.trainlog.data
 
+import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
 
 class BluetoothSyncTransportContractTest {
+    @Test
+    fun connectedPeerStartsAutoSyncWithoutUserActionButHonorsCooldown() {
+        assertTrue(
+            shouldPublishBluetoothArrivalRequest(
+                autoSyncEnabled = true,
+                cooldownReady = true,
+            )
+        )
+        assertFalse(
+            shouldPublishBluetoothArrivalRequest(
+                autoSyncEnabled = false,
+                cooldownReady = true,
+            )
+        )
+        assertFalse(
+            shouldPublishBluetoothArrivalRequest(
+                autoSyncEnabled = true,
+                cooldownReady = false,
+            )
+        )
+    }
+
     @Test
     fun androidPullArchiveCarriesGenerationAckRecoveryEvidence() {
         assertTrue(
diff --git a/android/app/src/test/java/com/labfytools/trainlog/data/SyncGenerationServiceTest.kt b/android/app/src/test/java/com/labfytools/trainlog/data/SyncGenerationServiceTest.kt
index a6faded..54b19de 100644
--- a/android/app/src/test/java/com/labfytools/trainlog/data/SyncGenerationServiceTest.kt
+++ b/android/app/src/test/java/com/labfytools/trainlog/data/SyncGenerationServiceTest.kt
@@ -11,6 +11,7 @@ import com.labfytools.trainlog.model.SessionDraft
 import com.labfytools.trainlog.model.SessionExerciseDraft
 import com.labfytools.trainlog.model.SessionSetDraft
 import com.labfytools.trainlog.model.SleepDiaryDraft
+import com.labfytools.trainlog.model.SleepMedication
 import com.labfytools.trainlog.model.TrackingMode
 import java.io.File
 import java.nio.file.Files
@@ -30,6 +31,238 @@ import org.robolectric.annotation.Config
 class SyncGenerationServiceTest {
     private val context: Context = ApplicationProvider.getApplicationContext()
 
+    @Test
+    fun sleepOnlyNightCrossesDesktopAckReplayAndSecondRevisionWithoutSession() {
+        val sourceName = "sleep-only-generation-${UUID.randomUUID()}.db"
+        val root = Files.createTempDirectory("trainlog-sleep-only-generation-").toFile()
+        val desktopDb = java.io.File(root, "desktop.sqlite")
+        val repositoryRoot =
+            generateSequence(java.io.File(checkNotNull(System.getProperty("user.dir")))) {
+                    it.parentFile
+                }
+                .first { java.io.File(it, "tools/sync_generation_exchange.py").isFile }
+        val generationTool =
+            java.io.File(repositoryRoot, "tools/sync_generation_exchange.py").absolutePath
+        var source = TrainlogRepository(context, sourceName)
+
+        fun run(vararg command: String): String {
+            val process =
+                ProcessBuilder(*command)
+                    .directory(repositoryRoot)
+                    .redirectErrorStream(true)
+                    .start()
+            val output = process.inputStream.bufferedReader().readText()
+            assertEquals(
+                "command failed: ${command.joinToString(" ")}\n$output",
+                0,
+                process.waitFor(),
+            )
+            return output
+        }
+
+        try {
+            run(
+                java.io.File(repositoryRoot, "build/tui/sync-generation-fixture").absolutePath,
+                desktopDb.absolutePath,
+            )
+            val desktopPeer =
+                Regex("PEER_ID=(peer_[^\\s]+)")
+                    .find(
+                        run(
+                            "python3",
+                            generationTool,
+                            "peer-id",
+                            "--database",
+                            desktopDb.absolutePath,
+                        )
+                    )!!
+                    .groupValues[1]
+            val medicationCreated =
+                source.saveSleepMedication(
+                    SleepMedication(
+                        medicationId = "",
+                        revisionId = "",
+                        createdAt = "2026-09-23T20:00:00+02:00",
+                        updatedAt = "2026-09-23T20:00:00+02:00",
+                        name = "Synthetic sleep-only medication",
+                        defaultDoseValue = 5.0,
+                        defaultDoseUnit = "mg",
+                        form = "tablet",
+                        note = "",
+                        active = true,
+                    )
+                ) as TrainlogRepository.SaveSleepDiaryResult.Saved
+            val preBed =
+                source.quickSleepMedication(
+                    medicationCreated.entryId,
+                    "2026-09-23T22:20:00+02:00",
+                    quantity = 2,
+                ) as TrainlogRepository.SleepQuickActionResult.Applied
+            val bed =
+                source.quickSleepBedTime("2026-09-23T22:30:00+02:00")
+                    as TrainlogRepository.SleepQuickActionResult.Applied
+            assertEquals(preBed.receipt.entryId, bed.receipt.entryId)
+            val firstMeasurement =
+                ParsedHeartRateMeasurement(
+                    bpm = 61,
+                    sensorContactDetected = true,
+                    energyExpended = 7,
+                    rrIntervals1024 = listOf(1000),
+                )
+            assertTrue(
+                source.recordLiveHeartRateForActiveSleep(
+                    "Synthetic HR",
+                    "2026-09-23T22:30:01+02:00",
+                    firstMeasurement,
+                ) is TrainlogRepository.HeartRateMutationResult.Applied
+            )
+            assertTrue(
+                source.quickSleepWake("2026-09-24T02:17:00+02:00")
+                    is TrainlogRepository.SleepQuickActionResult.Applied
+            )
+            assertTrue(
+                source.recordLiveHeartRateForActiveSleep(
+                    "Synthetic HR",
+                    "2026-09-24T02:17:01+02:00",
+                    firstMeasurement.copy(bpm = 65, rrIntervals1024 = listOf(980)),
+                ) is TrainlogRepository.HeartRateMutationResult.Applied
+            )
+            assertTrue(
+                source.quickSleepFinalGetUp("2026-09-24T06:31:00+02:00")
+                    is TrainlogRepository.SleepQuickActionResult.Applied
+            )
+            assertTrue(source.listSessions().isEmpty())
+
+            val night = source.listSleepDiary().single()
+            val capture =
+                JSONObject(source.buildHeartRateV1Json())
+                    .getJSONArray("captures")
+                    .getJSONObject(0)
+            assertEquals(night.entryId, capture.getString("context_id"))
+            assertEquals(2, capture.getJSONArray("samples").length())
+            assertEquals(2, night.intakes.single().quantity)
+
+            val service = SyncGenerationService(source)
+            val captured = service.capture(root, desktopPeer)
+            val diaryArtifact =
+                JSONObject(java.io.File(captured.stagingDirectory, "sleep-diary-v2.json").readText())
+            val heartArtifact =
+                JSONObject(java.io.File(captured.stagingDirectory, "heart-rate-v1.json").readText())
+            val historyArtifact =
+                JSONObject(java.io.File(captured.stagingDirectory, "history-v4.json").readText())
+            assertEquals(0, historyArtifact.getJSONArray("sessions").length())
+            val publishedNight = diaryArtifact.getJSONArray("entries").getJSONObject(0)
+            val publishedCapture = heartArtifact.getJSONArray("captures").getJSONObject(0)
+            assertEquals(night.entryId, publishedNight.getString("entry_id"))
+            assertEquals(
+                2,
+                publishedNight.getJSONArray("intakes").getJSONObject(0).getInt("quantity"),
+            )
+            assertEquals(capture.getString("capture_id"), publishedCapture.getString("capture_id"))
+
+            val published = service.publish(captured, java.io.File(root, "android-objects"))
+            val ack = java.io.File(root, "sleep-only-ack.json")
+            run(
+                "python3",
+                generationTool,
+                "consume-desktop",
+                published.absolutePath,
+                "--database",
+                desktopDb.absolutePath,
+                "--ack-output",
+                ack.absolutePath,
+            )
+            val ackDocument = JSONObject(ack.readText())
+            assertEquals(
+                "desktop ACK diagnostic: ${ackDocument.getString("diagnostic")}",
+                "consumed",
+                ackDocument.getString("result"),
+            )
+            assertEquals("acknowledged", service.acceptAcknowledgement(ack.readBytes()))
+            assertEquals("unchanged", service.acceptAcknowledgement(ack.readBytes()))
+            run(
+                "python3",
+                generationTool,
+                "consume-desktop",
+                published.absolutePath,
+                "--database",
+                desktopDb.absolutePath,
+                "--ack-output",
+                java.io.File(root, "sleep-only-replay-ack.json").absolutePath,
+            )
+            assertEquals(
+                // The desktop fixture owns one reserved calibration session;
+                // the empty Android history must not add a workout.
+                "1|1|2|2|2|1",
+                run(
+                        "sqlite3",
+                        desktopDb.absolutePath,
+                        "SELECT (SELECT count(*) FROM sleep_diary_entries WHERE entry_id='${night.entryId}') || '|' || " +
+                            "(SELECT count(*) FROM sleep_medication_intakes WHERE revision_id='${night.revisionId}') || '|' || " +
+                            "(SELECT quantity FROM sleep_medication_intakes WHERE revision_id='${night.revisionId}') || '|' || " +
+                            "(SELECT count(*) FROM heart_rate_samples WHERE capture_id='${capture.getString("capture_id")}') || '|' || " +
+                            "(SELECT count(*) FROM heart_rate_rr_intervals WHERE capture_id='${capture.getString("capture_id")}') || '|' || " +
+                            "(SELECT count(*) FROM sessions);",
+                    )
+                    .trim(),
+            )
+
+            val revised =
+                source.saveSleepDiary(
+                    SleepDiaryDraft(
+                        entryId = night.entryId,
+                        expectedRevision = night.revisionId,
+                        nightStartDate = night.nightStartDate,
+                        nightEndDate = night.nightEndDate,
+                        createdAt = night.createdAt,
+                        updatedAt = "2026-09-24T07:00:00+02:00",
+                        sleepQuality = night.sleepQuality,
+                        wakeQuality = night.wakeQuality,
+                        dayForm = night.dayForm,
+                        treatmentAndNotes = "Sleep-only revision two",
+                        events = night.events,
+                        intakes = night.intakes,
+                    )
+                ) as TrainlogRepository.SaveSleepDiaryResult.Saved
+            assertTrue(
+                source.validateSleepDiary(
+                    revised.entryId,
+                    revised.revisionId,
+                    "2026-09-24T07:01:00+02:00",
+                ) is TrainlogRepository.SaveSleepDiaryResult.Saved
+            )
+            val second = service.capture(root, desktopPeer)
+            val secondPublished =
+                service.publish(second, java.io.File(root, "android-objects-second"))
+            val secondAck = java.io.File(root, "sleep-only-second-ack.json")
+            run(
+                "python3",
+                generationTool,
+                "consume-desktop",
+                secondPublished.absolutePath,
+                "--database",
+                desktopDb.absolutePath,
+                "--ack-output",
+                secondAck.absolutePath,
+            )
+            assertEquals("acknowledged", service.acceptAcknowledgement(secondAck.readBytes()))
+            assertEquals(
+                revised.revisionId,
+                run(
+                        "sqlite3",
+                        desktopDb.absolutePath,
+                        "SELECT current_revision_id FROM sleep_diary_entries WHERE entry_id='${night.entryId}';",
+                    )
+                    .trim(),
+            )
+            assertTrue(source.listSessions().isEmpty())
+        } finally {
+            source.close()
+            context.deleteDatabase(sourceName)
+            root.deleteRecursively()
+        }
+    }
+
     @Test
     fun desktopProgramDeletionGenerationIsAckedAndCannotResurrect() {
         val repositoryRoot =
@@ -322,6 +555,13 @@ class SyncGenerationServiceTest {
                     destinationService.peerId(),
                     runId,
                 )
+            val retryRun = "sy_${UUID.randomUUID()}"
+            val crossRunResume =
+                SyncGenerationCoordinator(source)
+                    .resumableGeneration(retryRun, destinationService.peerId())
+            assertEquals(outbound.generationId, crossRunResume?.generationId)
+            assertEquals(retryRun, crossRunResume?.runId)
+            assertEquals(outbound.manifestSha256, crossRunResume?.manifestSha256)
             val outboundDirectory =
                 sourceService.publish(outbound, java.io.File(root, "source-objects"))
             sourceService.acceptAcknowledgement(
@@ -353,6 +593,74 @@ class SyncGenerationServiceTest {
         }
     }
 
+    @Test
+    fun crossRunResumeAcceptsExactImmutableAcknowledgementFromOriginalRun() {
+        val generationId = "gen_${UUID.randomUUID()}"
+        val originalRunId = "sy_${UUID.randomUUID()}"
+        val retryRunId = "sy_${UUID.randomUUID()}"
+        val digest = "a".repeat(64)
+        val captured =
+            CapturedSyncGeneration(generationId, retryRunId, digest, java.io.File("unused"))
+        val acknowledgement =
+            JSONObject()
+                .put("run_id", originalRunId)
+                .put("generation_id", generationId)
+                .put("manifest_sha256", digest)
+
+        assertTrue(acknowledgementMatchesCapturedGeneration(acknowledgement, captured))
+        acknowledgement.put("manifest_sha256", "b".repeat(64))
+        assertTrue(!acknowledgementMatchesCapturedGeneration(acknowledgement, captured))
+    }
+
+    @Test
+    fun ledgerBackedSiblingMakesRetainedWaitingBranchesCapacityTerminal() {
+        val name = "generation-superseded-capacity-${UUID.randomUUID()}.db"
+        val root = Files.createTempDirectory("trainlog-generation-superseded-").toFile()
+        val repository = TrainlogRepository(context, name)
+        try {
+            val service = SyncGenerationService(repository)
+            val peer = "peer_11111111-1111-4111-8111-111111111111"
+            val branches = (0 until 4).map { service.capture(root, peer) }
+            val acknowledged = branches.last()
+            repository.inSyncGenerationTransaction { db ->
+                db.execSQL(
+                    "UPDATE sync_generations SET parent_generation_id=? WHERE consumer_peer_id=?",
+                    arrayOf("gen_22222222-2222-4222-8222-222222222222", peer),
+                )
+                db.execSQL(
+                    "UPDATE sync_generations SET status='acknowledged',acknowledged_at=? " +
+                        "WHERE generation_id=?",
+                    arrayOf("2026-09-24T07:00:00+02:00", acknowledged.generationId),
+                )
+                db.execSQL(
+                    "INSERT INTO sync_acknowledgements VALUES(?,?,?,?,?,?,?,?,?,?,?)",
+                    arrayOf(
+                        "ack_${UUID.randomUUID()}",
+                        acknowledged.generationId,
+                        acknowledged.runId,
+                        service.peerId(),
+                        peer,
+                        acknowledged.manifestSha256,
+                        "consumed",
+                        "sqlite-commit-full",
+                        "2026-09-24T07:00:00+02:00",
+                        "",
+                        "a".repeat(64),
+                    ),
+                )
+            }
+
+            // The three sibling branches remain durable, but the ledger-backed
+            // acknowledged sibling proves that none can be the causal tip.
+            assertEquals(3, branches.dropLast(1).size)
+            assertTrue(service.capture(root, peer).generationId.startsWith("gen_"))
+        } finally {
+            repository.close()
+            context.deleteDatabase(name)
+            root.deleteRecursively()
+        }
+    }
+
     @Test
     fun coordinatorOnlyTreatsCorrelatedFreshRequestAsActionable() {
         val databaseName = "generation-actionable-${UUID.randomUUID()}.db"
diff --git a/docs/current_state.md b/docs/current_state.md
index c057a35..74f4323 100644
--- a/docs/current_state.md
+++ b/docs/current_state.md
@@ -10,6 +10,16 @@ the wired recovery path. The separately configured private Drive transport
 remains available to its legacy mirror/fallback workflow. No transport copies
 SQLite.
 
+Automatic Bluetooth restart recovery preserves the immutable generation
+identity across conversation-run changes and recognizes the exact original-run
+ACK by immutable generation ID and manifest digest before full SQLite
+validation. An unacknowledged branch is excluded
+from the bounded admission count only when a different sibling has a durable,
+ledger-backed consumed acknowledgement; the superseded bytes and row remain
+retained. The desktop service installer retires the exact obsolete private
+ExecStart override that omitted required runtime paths and installs both
+`trainlog-syncd` and the BlueZ RFCOMM agent.
+
 Android synchronization paths share the same concurrency-guarded generation
 coordinator as SyncScreen. That coordinator has one process-wide ownership
 arbiter: explicit foreground intent has priority over automatic background
diff --git a/docs/sync_exchange.md b/docs/sync_exchange.md
index 9c1556a..dcff46e 100644
--- a/docs/sync_exchange.md
+++ b/docs/sync_exchange.md
@@ -953,6 +953,20 @@ active. Archive directories are outside bounded MTP polling and are never
 uploaded recursively. Failure or interruption leaves admission closed rather
 than fabricating an ACK or discarding evidence.
 
+An unacknowledged generation whose parent also has a distinct, ledger-backed
+acknowledged child is a retained superseded branch: it stays available for
+audit and is never deleted or assigned a fabricated ACK, but it no longer
+consumes active admission because it cannot become the causal tip. After a
+transport reset, the next run republishes the newest unsuperseded immutable
+generation for that peer before attempting a new capture. The mutable
+generation reference uses the new conversation run; generation ID, manifest,
+artifact bytes and eventual ACK correlation remain unchanged. Because the
+immutable manifest and its durable ACK retain the original run identity, a
+cross-run retry recognizes that ACK by the exact generation ID and manifest
+digest; the producer's SQLite acknowledgement validator still verifies the
+complete peer, result, durability and original-run contract before advancing
+state.
+
 Before Android captures for a negotiated `generation-archive-v1` conversation,
 the desktop consumer publishes
 `desktop-archive-acknowledgements-v1.json`. Its strictly correlated envelope
@@ -999,11 +1013,14 @@ idempotently. Causal V1 operation bytes remain unchanged across first emission
 and retransmission because generation membership lives only in
 `sync_causal_publications`.
 
-The foreground Android coordinator correlates both durable desktop ACKs and
-desktop generation references by the active run (and the Android generation
-for its ACK). Objects retained from an interrupted conversation are ignored
-until atomically replaced by matching objects. After both peer ACKs, Android
-reports completion directly; it does not enter the legacy receipt wait state.
+The foreground Android coordinator correlates desktop generation references
+by the active run. It correlates a durable desktop ACK for an ordinary attempt
+by the generation and manifest of that run; for a cross-run resume, those same
+two immutable identities deliberately recognize the exact ACK whose embedded
+run remains the original capture run. Objects retained from an interrupted
+conversation are ignored until atomically replaced by matching objects. After
+both peer ACKs, Android reports completion directly; it does not enter the
+legacy receipt wait state.
 
 The peer publication precedes one fresh
 `trainlog-sync-full-generation-request-v1` signal on
diff --git a/docs/tests.md b/docs/tests.md
index 1435da0..c5ee695 100644
--- a/docs/tests.md
+++ b/docs/tests.md
@@ -25,6 +25,18 @@ still conflicts. The equipment client test removes `crypto.randomUUID`, uses
 deterministic `getRandomValues` bytes, and completes the protected merge HTTP
 request; native merge tests retain their transaction/rollback coverage.
 
+The real Sleep Bluetooth recovery regression starts with no Android session,
+records a pre-bed medication with `quantity=2`, Couché, two BPM/RR samples
+separated by Réveil, and Levé. It captures and publishes the production V2
+Sleep and V1 heart-rate artifacts, imports them with the desktop consumer,
+accepts and replays the ACK without duplication, then admits a second
+Sleep-only revision. Separate tests prove connection-arrival auto-request
+policy with its cooldown, cross-run reuse of an unacknowledged immutable
+generation and recognition of its original-run exact generation/digest ACK,
+ledger-backed superseded-branch capacity, fresh-peer non-root Sleep ancestry,
+service-installer upgrade behavior, and ACK-recovery progress frames over the
+Bluetooth-selected orchestrator path.
+
 UI regressions assert the Sleep labels at exactly 0/25/50/75/100%, persisted
 Dashboard sizing and reset behavior, English preference persistence across a
 remount, centralized Dashboard English labels, non-stretched chart aspect
diff --git a/tests/test_sleep_diary_exchange.py b/tests/test_sleep_diary_exchange.py
index 3090456..6ecbb4e 100644
--- a/tests/test_sleep_diary_exchange.py
+++ b/tests/test_sleep_diary_exchange.py
@@ -186,6 +186,47 @@ class SleepExchangeTest(unittest.TestCase):
         with self.assertRaisesRegex(ValueError, "concurrent"):
             exchange.apply(self.db, sibling)
 
+    def test_current_snapshot_seeds_fresh_peer_from_non_root_revisions(self):
+        parent = "slr_20000000-0000-4000-8000-000000000002"
+        tip = "slr_40000000-0000-4000-8000-000000000004"
+        document = self.document(entry(tip, parent))
+        document["version"] = 2
+        document["entries"][0]["intakes"][0]["quantity"] = 2
+        document["entries"][0]["ancestry"] = [tip, parent]
+
+        medication = document["medications"][0]
+        medication_parent = medication["revision_id"]
+        medication_tip = "medr_a0000000-0000-4000-8000-00000000000a"
+        medication["revision_id"] = medication_tip
+        medication["parent_revision_id"] = medication_parent
+        medication["ancestry"] = [medication_tip, medication_parent]
+        medication["updated_at"] = "2026-10-25T18:05:00+01:00"
+
+        rejected = self.document(entry(
+            "slr_50000000-0000-4000-8000-000000000005",
+            "slr_60000000-0000-4000-8000-000000000006",
+        ))
+        rejected["version"] = 2
+        rejected["entries"][0]["intakes"][0]["quantity"] = 2
+        with self.assertRaisesRegex(ValueError, "unknown parent"):
+            exchange.apply(self.db, rejected)
+        self.db.rollback()
+
+        self.assertEqual((1, 0), exchange.apply(self.db, document))
+        self.assertEqual(
+            (tip, parent),
+            self.db.execute(
+                "SELECT revision_id,parent_revision_id FROM sleep_diary_revisions"
+            ).fetchone(),
+        )
+        self.assertEqual(
+            (medication_tip, medication_parent),
+            self.db.execute(
+                "SELECT revision_id,parent_revision_id FROM sleep_medication_revisions"
+            ).fetchone(),
+        )
+
+
     def test_rejects_concurrent_sibling_and_negative_absolute_interval(self):
         first = "slr_20000000-0000-4000-8000-000000000002"
         self.assertEqual((1, 0), exchange.apply(self.db, self.document(entry(first))))
diff --git a/tests/test_sync_deployment_tools.py b/tests/test_sync_deployment_tools.py
index e971a9c..142a348 100644
--- a/tests/test_sync_deployment_tools.py
+++ b/tests/test_sync_deployment_tools.py
@@ -13,6 +13,17 @@ import sync_generation_exchange as generation
 
 
 class DeploymentToolsTest(unittest.TestCase):
+    def test_user_service_installer_retires_only_known_legacy_exec_override(self):
+        installer = (ROOT / "tools/install_syncd_user.sh").read_text()
+        self.assertIn(
+            "grep -Fxq 'ExecStart=%h/.local/bin/trainlog-syncd --interval 3'",
+            installer,
+        )
+        self.assertIn('rm -f -- "$LEGACY_ROLLOUT"', installer)
+        self.assertIn('--sync-once "$SYNC_ONCE"', installer)
+        self.assertIn('--bt-adapter "$BT_ADAPTER"', installer)
+        self.assertIn('--mtp-adapter "$MTP_ADAPTER"', installer)
+
     def test_sqlite_backup_captures_committed_wal_and_restores_invariants(self):
         with tempfile.TemporaryDirectory() as directory:
             root = Path(directory)
diff --git a/tests/test_sync_orchestrator.py b/tests/test_sync_orchestrator.py
index ecc849e..4cffc8e 100644
--- a/tests/test_sync_orchestrator.py
+++ b/tests/test_sync_orchestrator.py
@@ -156,7 +156,10 @@ class OrchestratorTest(unittest.TestCase):
                 "assert sys.argv[sys.argv.index('--mode')+1]=='bt'\n"
                 "assert '--bt-adapter' in sys.argv\n"
                 "v=" + repr(report) +
-                "\nv['run_id']=sys.argv[sys.argv.index('--run-id')+1]\nprint(json.dumps(v))\n"
+                "\nv['run_id']=sys.argv[sys.argv.index('--run-id')+1]\n"
+                "p={'format':'trainlog-sync-progress','version':1,'run_id':v['run_id'],"
+                "'phase':'android_archive_ack_observed','recovered_acknowledgements':1}\n"
+                "print(json.dumps(p))\nprint(json.dumps(v))\n"
             )
             bt_marker = root / "bt-probe"
             bt_adapter = sandbox / "trainlog_generation_bt_adapter.py"
@@ -175,7 +178,7 @@ class OrchestratorTest(unittest.TestCase):
                 bluetooth_device_address="AA:BB:CC:DD:EE:FF",
             )
             result = self.invoke(sandbox / "sync_orchestrator.py", values)
-            self.assertEqual(result.returncode, 0, result.stderr)
+            self.assertEqual(result.returncode, 0, result.stderr or values[1].read_text())
             self.assertTrue(bt_marker.is_file())
             self.assertFalse(mtp_marker.exists())
             final = json.loads(values[1].read_text())
diff --git a/tools/install_syncd_user.sh b/tools/install_syncd_user.sh
index 64e0064..d2a545b 100755
--- a/tools/install_syncd_user.sh
+++ b/tools/install_syncd_user.sh
@@ -24,6 +24,18 @@ done
 
 mkdir -p   "$HOME/.local/bin"   "$HOME/.config/systemd/user"
 
+# WHY: private pre-orchestrator rollouts installed this exact drop-in to call
+# syncd without its now-required bounded runtime paths. Leaving it in place
+# silently overrides the canonical unit below and creates an endless restart
+# loop. CONTRACT: remove only the known obsolete Trainlog-owned override;
+# preserve every unrecognized administrator customization. INVARIANT: the
+# effective ExecStart always owns sync-once plus both transport adapters.
+LEGACY_ROLLOUT="$HOME/.config/systemd/user/trainlog-syncd.service.d/rollout.conf"
+if [[ -f "$LEGACY_ROLLOUT" ]] &&
+   grep -Fxq 'ExecStart=%h/.local/bin/trainlog-syncd --interval 3' "$LEGACY_ROLLOUT"; then
+  rm -f -- "$LEGACY_ROLLOUT"
+fi
+
 ln -sfn "$SYNC_ONCE" "$HOME/.local/bin/trainlog-sync-once"
 ln -sfn "$DAEMON" "$HOME/.local/bin/trainlog-syncd"
 ln -sfn "$BT_AGENT" "$HOME/.local/bin/trainlog-btd"
diff --git a/tools/sleep_diary_exchange.py b/tools/sleep_diary_exchange.py
index 84cafea..888a193 100644
--- a/tools/sleep_diary_exchange.py
+++ b/tools/sleep_diary_exchange.py
@@ -328,7 +328,13 @@ def apply(db: sqlite3.Connection, root: dict) -> tuple[int, int]:
         )
         if local is not None and not remote_descends_from_local and medication["parent_revision_id"] != local[0]:
             fail("concurrent medication revision")
-        if local is None and medication["parent_revision_id"] is not None: fail("unknown medication parent")
+        # CONTRACT: this artifact is a current-state companion, not a revision
+        # log. A fresh peer may seed a non-root tip only when the validated
+        # complete ancestry accompanies it; legacy payloads without ancestry
+        # retain the strict unknown-parent rejection.
+        if (local is None and medication["parent_revision_id"] is not None and
+                "ancestry" not in medication):
+            fail("unknown medication parent")
         if local is not None and local[1] and not medication["deleted"]: fail("medication resurrection")
         if local is None:
             db.execute("INSERT INTO sleep_medications VALUES(?,?,?,?,?)", (medication["medication_id"], medication["created_at"], medication["updated_at"], medication["revision_id"], int(medication["deleted"])))
@@ -379,7 +385,13 @@ def apply(db: sqlite3.Connection, root: dict) -> tuple[int, int]:
         remote_descends_from_local = local is not None and local[0] in item.get("ancestry", [])[1:]
         if local is not None and not remote_descends_from_local and item["parent_revision_id"] != local[0]:
             fail("concurrent sleep diary revision")
-        if local is None and item["parent_revision_id"] is not None:
+        # WHY: one-tap Sleep creates several local revisions before its first
+        # synchronization. The current snapshot carries their bounded lineage
+        # by identity, so a new desktop must be able to seed the tip without
+        # inventing historical payloads. INVARIANT: missing ancestry still
+        # rejects a non-root first snapshot.
+        if (local is None and item["parent_revision_id"] is not None and
+                "ancestry" not in item):
             fail("sleep diary revision has an unknown parent")
         if local is not None and local[1] and not item["deleted"]:
             fail("sleep diary deletion cannot be resurrected")
diff --git a/tools/sync_orchestrator.py b/tools/sync_orchestrator.py
index ae87b5e..3669837 100644
--- a/tools/sync_orchestrator.py
+++ b/tools/sync_orchestrator.py
@@ -30,6 +30,7 @@ MAX_DIAGNOSTIC = 1024
 PHASES = {
     "requested",
     "waiting_android_publication",
+    "android_archive_ack_observed",
     "running",
     "local_import_committed",
     "published",
@@ -297,6 +298,7 @@ def read_worker(
     deadline = time.monotonic() + timeout
     allowed = [
         "waiting_android_publication",
+        "android_archive_ack_observed",
         "running",
         "local_import_committed",
         "published",
@@ -338,6 +340,7 @@ def read_worker(
                                 "inbound_generation_id",
                                 "outbound_generation_id",
                                 "manifest_sha256",
+                                "recovered_acknowledgements",
                             }
                             or value.get("version") != 1
                             or value.get("run_id") != run_id