Persist dashboard backup metrics separately

internal/store/store_test.go

@@ -3,6 +3,7 @@ package store
 import (
 	"os"
 	"testing"
+	"time"
 
 	"git.casaderoll.de/michael/urbm/internal/model"
 )
@@ -28,3 +29,32 @@ func TestStoreInitializesAndPersists(t *testing.T) {
 		t.Fatalf("config mode = %o", info.Mode().Perm())
 	}
 }
+
+func TestBackupMetricsPersistSeparatelyFromRuns(t *testing.T) {
+	s := New(t.TempDir())
+	if err := s.Init(); err != nil {
+		t.Fatal(err)
+	}
+	finished := time.Date(2026, 7, 13, 1, 30, 0, 0, time.UTC)
+	metrics := []model.BackupMetric{{SchemaVersion: model.SchemaVersion, RunID: "run-1", JobID: "job-1", FinishedAt: finished, Status: "success", BytesProcessed: 42, FilesProcessed: 7}}
+	if err := s.SaveBackupMetrics(metrics); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.SaveRuns(nil); err != nil {
+		t.Fatal(err)
+	}
+	loaded, err := s.LoadBackupMetrics()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(loaded) != 1 || loaded[0].RunID != "run-1" || loaded[0].BytesProcessed != 42 {
+		t.Fatalf("backup metrics = %#v", loaded)
+	}
+	info, err := os.Stat(s.backupMetricsPath())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if info.Mode().Perm() != 0600 {
+		t.Fatalf("backup metrics mode = %o", info.Mode().Perm())
+	}
+}