diff --git a/platform/service/distribution_build_execution.go b/platform/service/distribution_build_execution.go
index 13d37e9..1791122 100644
--- a/platform/service/distribution_build_execution.go
+++ b/platform/service/distribution_build_execution.go
@@ -234,6 +234,7 @@ func (svc *CoreService) runDistributionPackageContext(distribution domain.RunDis
 	} else if !errors.Is(bindingErr, repo.ErrNotFound) {
 		return runDistributionPackageContext{}, bindingErr
 	}
+	profileKey = defaultRunDistributionProfileKey(plugin, profileKey)
 	plan, err := runAutonomousLifecyclePlan(distribution, instance, plugin, profileKey, bindings)
 	if err != nil {
 		return runDistributionPackageContext{}, err
@@ -245,6 +246,20 @@ func (svc *CoreService) runDistributionPackageContext(distribution domain.RunDis
 	return runDistributionPackageContext{profileKey: profileKey, workspaceSeed: seed, autonomousLifecycle: plan}, nil
 }
 
+func defaultRunDistributionProfileKey(plugin domain.GamePlugin, profileKey string) string {
+	profileKey = strings.TrimSpace(profileKey)
+	if profileKey != "" {
+		if profile, ok := runtimeLifecycleProfileForKey(plugin.RuntimeProfiles, profileKey); ok {
+			return profile.Key
+		}
+		return profileKey
+	}
+	if len(plugin.RuntimeProfiles.LifecycleProfiles) == 0 {
+		return ""
+	}
+	return plugin.RuntimeProfiles.LifecycleProfiles[0].Key
+}
+
 func runAutonomousLifecyclePlan(distribution domain.RunDistribution, instance domain.ServerInstance, plugin domain.GamePlugin, profileKey string, bindings map[string]string) (*domain.RunAutonomousLifecyclePlan, error) {
 	plan := &domain.RunAutonomousLifecyclePlan{
 		SchemaVersion:      "1",
diff --git a/platform/service/distribution_build_execution_test.go b/platform/service/distribution_build_execution_test.go
index 90903c1..a21cb69 100644
--- a/platform/service/distribution_build_execution_test.go
+++ b/platform/service/distribution_build_execution_test.go
@@ -214,6 +214,55 @@ func hasAutonomousLogSource(sources []domain.RunAutonomousLogSource, kind string
 	return false
 }
 
+func TestCoreServiceRunDistributionDefaultsEmptyDeploymentProfileToPluginLifecycleProfile(t *testing.T) {
+	svc := newTestCoreService()
+	plugin := scumDeploymentTestPlugin()
+	plugin.Name = "SCUM"
+	plugin.Version = "0.1.1"
+	plugin.ServerType = "scum"
+	plugin.Status = domain.GamePluginStatusInstalled
+	plugin.SupportedOS = []string{"windows"}
+	plugin.DeclaredPermissions = []string{"server.run.distribution"}
+	plugin.LifecycleActions = domain.PluginLifecycleActions{Install: "actions/install.json", Start: "actions/start.json", Stop: "actions/stop.json", Status: "actions/status.json"}
+	plugin.RuntimeProfiles.LifecycleProfiles = []domain.RuntimeLifecycleProfile{{Key: "run-local", Mode: "local-process", Capabilities: []string{domain.LifecycleCapabilityInstall, domain.LifecycleCapabilityStart, domain.LifecycleCapabilityStop, domain.LifecycleCapabilityStatus}, ActionRefs: domain.PluginLifecycleActions{Install: "actions/install.json", Start: "actions/start.json", Stop: "actions/stop.json", Status: "actions/status.json"}, Platforms: []string{"windows"}}}
+	requireManualSCUMRuntimeBindings(&plugin, "run-local")
+	if err := svc.store.GamePlugins().Create(plugin); err != nil {
+		t.Fatalf("create SCUM plugin: %v", err)
+	}
+	session := createServiceUserAndLogin(t, svc, domain.User{ID: "scum-default-profile-owner", DisplayName: "SCUM Default Profile Owner", Email: "scum-default-profile@example.test", Roles: []string{"server-owner"}, PasswordHash: "secret-password"})
+	created, err := svc.CreateServerInstanceWorkflowForSession(session, domain.ServerLifecycleCreate{
+		ID: "scum-default-profile-package", PluginID: plugin.ID, Name: "SCUM Default Profile Package", IdempotencyKey: "scum-default-profile-package-create",
+		Deployment: domain.ServerDeploymentDefinition{Mode: domain.ServerDeploymentModeGuided, ServerRoot: `D:\scum-default-profile`, CreateInputs: map[string]string{"serverName": "Moon", "gamePort": "27000", "queryPort": "27015", "maxPlayers": "128"}},
+	})
+	if err != nil {
+		t.Fatalf("create SCUM guided draft without explicit profile: %v", err)
+	}
+	if created.Instance.Deployment.ProfileKey != "run-local" {
+		t.Fatalf("expected create defaults to persist plugin lifecycle profile, got %+v", created.Instance.Deployment)
+	}
+
+	legacy := created.Instance
+	legacy.Deployment.ProfileKey = ""
+	if err := svc.store.ServerInstances().Update(legacy); err != nil {
+		t.Fatalf("simulate legacy empty deployment profile: %v", err)
+	}
+	inputs := make(chan domain.DistributionBuildInput, 1)
+	svc.ConfigureDistributionBuilder(captureDistributionBuilder{inputs: inputs, payload: []byte("profile-default-build")})
+	if _, err := svc.GenerateRunDistributionForSession(session, domain.RunDistributionGenerateRequest{ServerInstanceID: legacy.ID, TargetOS: "windows", TargetArch: "amd64", IdempotencyKey: "scum-default-profile-package"}); err != nil {
+		t.Fatalf("generate Run distribution with empty deployment profile: %v", err)
+	}
+	var platformInput domain.DistributionBuildInput
+	select {
+	case platformInput = <-inputs:
+	case <-time.After(time.Second):
+		t.Fatal("platform builder did not receive profile-defaulted input")
+	}
+	plan := platformInput.AutonomousLifecycle
+	if platformInput.ProfileKey != "run-local" || plan == nil || plan.ProfileKey != "run-local" || plan.Deployment == nil || plan.Deployment.ProfileKey != "run-local" {
+		t.Fatalf("expected package context to default empty deployment profile to run-local, input=%+v plan=%+v", platformInput, plan)
+	}
+}
+
 func TestCoreServiceBuildsWithoutRegisteredDistributionWorker(t *testing.T) {
 	svc, session, instance := newDistributionTestFixture(t)
 	bootstrapEndpoint, err := svc.store.RunEndpoints().Get(instance.RunEndpointID)
diff --git a/platform/service/log_ingest.go b/platform/service/log_ingest.go
index 1e016fa..3532bdc 100644
--- a/platform/service/log_ingest.go
+++ b/platform/service/log_ingest.go
@@ -150,7 +150,7 @@ func (svc *CoreService) ensureRunLogStreamForBatch(batch domain.LogBatchIngest,
 		expectedStreamID = runSessionLogStreamID(batch.RunEndpointID, batch.ServerInstanceID, batch.LogSessionID, batch.StreamKey)
 	}
 	if batch.LogStreamID != expectedStreamID {
-		if !legacyAutonomousLogStream(batch) {
+		if !legacySessionRunLogStream(batch) && !legacyAutonomousLogStream(batch) {
 			return repo.ErrNotFound
 		}
 	}
@@ -168,6 +168,10 @@ func (svc *CoreService) ensureRunLogStreamForBatch(batch domain.LogBatchIngest,
 	return err
 }
 
+func legacySessionRunLogStream(batch domain.LogBatchIngest) bool {
+	return batch.LogSessionID != "" && batch.LogStreamID == runLogStreamID(batch.RunEndpointID, batch.ServerInstanceID, batch.StreamKey)
+}
+
 func legacyAutonomousLogStream(batch domain.LogBatchIngest) bool {
 	jobID, ok := jobIDFromLogBatch(batch)
 	return ok && strings.HasPrefix(jobID, "autonomous-")
diff --git a/platform/service/log_ingest_test.go b/platform/service/log_ingest_test.go
index 8bf1a88..c43441a 100644
--- a/platform/service/log_ingest_test.go
+++ b/platform/service/log_ingest_test.go
@@ -463,6 +463,28 @@ func TestCoreServiceAcceptsSessionMetadataOnLegacyAutonomousStreamID(t *testing.
 	}
 }
 
+func TestCoreServiceAcceptsSessionMetadataOnLegacyRunStreamID(t *testing.T) {
+	svc, sessionToken := newRegisteredLogIngestService(t)
+	batch := validLogBatch(t, sessionToken, 1, 1)
+	batch.LogStreamID = runLogStreamID("run-local", "server-1", "stdout")
+	batch.LogSessionID = "session-a"
+	batch.SessionStartedAt = time.Date(2026, 7, 3, 12, 30, 0, 0, time.UTC)
+	ack, err := svc.IngestLogBatch(batch)
+	if err != nil {
+		t.Fatalf("ingest session-scoped legacy run stream: %v", err)
+	}
+	if !ack.Accepted || ack.LogStreamID != batch.LogStreamID || ack.LatestSeq != batch.LastSeq {
+		t.Fatalf("unexpected legacy run session ack: %+v", ack)
+	}
+	stream, err := svc.GetLogStream(batch.LogStreamID)
+	if err != nil {
+		t.Fatalf("get session-scoped legacy run stream: %v", err)
+	}
+	if stream.LogSessionID != batch.LogSessionID || !stream.SessionStartedAt.Equal(batch.SessionStartedAt) {
+		t.Fatalf("session metadata was not persisted: %+v", stream)
+	}
+}
+
 func TestCoreServiceRejectsOutOfOrderAndConflictingLogBatches(t *testing.T) {
 	svc, sessionToken := newRegisteredLogIngestService(t)
 	createLogStreamFixture(t, svc)
diff --git a/platform/service/server_lifecycle.go b/platform/service/server_lifecycle.go
index 6da2fb7..0d2f7af 100644
--- a/platform/service/server_lifecycle.go
+++ b/platform/service/server_lifecycle.go
@@ -57,7 +57,9 @@ func (svc *CoreService) CreateServerInstanceWorkflow(create domain.ServerLifecyc
 		instance.State = domain.ServerInstanceStateDraft
 	}
 	if instance.Deployment.Mode != "" {
-		instance.Deployment.ProfileKey = create.ProfileKey
+		if strings.TrimSpace(create.ProfileKey) != "" {
+			instance.Deployment.ProfileKey = create.ProfileKey
+		}
 		instance.Deployment.RuntimeBindings = domain.CopyStringMap(create.Bindings)
 		instance.Deployment.Revision = maxInt(1, instance.Deployment.Revision)
 		instance.Deployment.UpdatedAt = stamp