Persist dashboard backup metrics separately

internal/service/safety_test.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"git.casaderoll.de/michael/urbm/internal/model"
+	"git.casaderoll.de/michael/urbm/internal/store"
 )
 
 func TestRepositoryLockHonorsContextCancellation(t *testing.T) {
@@ -25,6 +26,40 @@ func TestRepositoryLockHonorsContextCancellation(t *testing.T) {
 	unlock()
 }
 
+func TestBackupMetricsSurviveClearedRunSnapshot(t *testing.T) {
+	st := store.New(t.TempDir())
+	if err := st.Init(); err != nil {
+		t.Fatal(err)
+	}
+	s := &Service{store: st, persistRuns: make(chan []model.Run, 1)}
+	finished := time.Date(2026, 7, 13, 1, 30, 0, 0, time.UTC)
+	run := model.Run{ID: "run-1", JobID: "job-1", TaskType: "backup", Status: "success", FinishedAt: &finished, BytesProcessed: 1024, FilesProcessed: 12}
+	s.queuePersistence([]model.Run{run})
+	s.queuePersistence(nil)
+	metrics := s.BackupMetrics()
+	if len(metrics) != 1 || metrics[0].RunID != run.ID || metrics[0].FilesProcessed != 12 {
+		t.Fatalf("backup metrics after clear = %#v", metrics)
+	}
+}
+
+func TestBackupMetricsOnlyCaptureCompletedSuccessfulBackupsOnce(t *testing.T) {
+	st := store.New(t.TempDir())
+	s := &Service{store: st}
+	finished := time.Now().UTC()
+	valid := model.Run{ID: "valid", JobID: "job-1", TaskType: "backup", Status: "warning", FinishedAt: &finished}
+	s.captureBackupMetrics([]model.Run{
+		valid,
+		valid,
+		{ID: "failed", TaskType: "backup", Status: "failed", FinishedAt: &finished},
+		{ID: "active", TaskType: "backup", Status: "running"},
+		{ID: "rsync", TaskType: "rsync", Status: "success", FinishedAt: &finished},
+	})
+	metrics := s.BackupMetrics()
+	if len(metrics) != 1 || metrics[0].RunID != valid.ID {
+		t.Fatalf("captured backup metrics = %#v", metrics)
+	}
+}
+
 func TestPersistentRunLogsAreWrittenAndPruned(t *testing.T) {
 	dir := t.TempDir()
 	config := model.DefaultConfig()