diff --git a/internal/k8s/job_helpers_test.go b/internal/k8s/job_helpers_test.go
index c7dec1d..b732499 100644
--- a/internal/k8s/job_helpers_test.go
+++ b/internal/k8s/job_helpers_test.go
@@ -46,6 +46,12 @@ func TestJobSupportHelpersCoverFallbackAndFormattingBranches(t *testing.T) {
 	if got := parseBoolWithDefault("yes", false); got != true {
 		t.Fatalf("expected explicit true parse, got %v", got)
 	}
+	if got := parseBoolWithDefault("0", true); got != false {
+		t.Fatalf("expected numeric false parse, got %v", got)
+	}
+	if got := parseBoolWithDefault("maybe", false); got != false {
+		t.Fatalf("expected unknown value to fall back, got %v", got)
+	}
 }
 
 func TestJobNameBackupCommandAndResticEnvCoverRemainingBranches(t *testing.T) {
diff --git a/internal/k8s/jobs_test.go b/internal/k8s/jobs_test.go
index 877ba9f..1d4bd93 100644
--- a/internal/k8s/jobs_test.go
+++ b/internal/k8s/jobs_test.go
@@ -167,6 +167,15 @@ func TestResolvePVCMountedNodeIgnoresDeadPodsAndFindsMountedClaim(t *testing.T)
 	if err != nil || nodeName != "" {
 		t.Fatalf("expected missing pvc mount to return empty node, got %q %v", nodeName, err)
 	}
+
+	clientset := k8sfake.NewSimpleClientset()
+	clientset.PrependReactor("list", "pods", func(action k8stesting.Action) (bool, runtime.Object, error) {
+		return true, nil, errors.New("resolve pods exploded")
+	})
+	client = &Client{Clientset: clientset}
+	if _, err := client.resolvePVCMountedNode(context.Background(), "apps", "data"); err == nil || !strings.Contains(err.Error(), "resolve pods exploded") {
+		t.Fatalf("expected pod list error, got %v", err)
+	}
 }
 
 func TestReadBackupJobLogCoversSuccessAndListFailures(t *testing.T) {
diff --git a/internal/server/restore_handlers_test.go b/internal/server/restore_handlers_test.go
index 354910d..eebeec4 100644
--- a/internal/server/restore_handlers_test.go
+++ b/internal/server/restore_handlers_test.go
@@ -528,6 +528,9 @@ func TestExecuteRestoreResticAndHelperFunctions(t *testing.T) {
 		if got := targetPVCName("", "Data_PVC"); got != "restore-data-pvc" {
 			t.Fatalf("expected default restore prefix, got %q", got)
 		}
+		if got := targetPVCName("___", "Data_PVC"); got != "restore-data-pvc" {
+			t.Fatalf("expected sanitized-empty prefix to fall back to restore, got %q", got)
+		}
 		if got := targetPVCName("drill", "cache"); got != "drill-cache" {
 			t.Fatalf("expected explicit prefix, got %q", got)
 		}
diff --git a/internal/server/server_test.go b/internal/server/server_test.go
index ecac3eb..0eeaa4a 100644
--- a/internal/server/server_test.go
+++ b/internal/server/server_test.go
@@ -1097,6 +1097,55 @@ func TestParseResticStoredBytesFromJSONSummary(t *testing.T) {
 	}
 }
 
+func TestParseResticStoredBytesRejectsEmptyAndInvalidSummaries(t *testing.T) {
+	testCases := []string{
+		"",
+		`{"message_type":"summary","data_added":"not-a-number"}`,
+		`Added to the repository: 120.500 MiB (not-a-size stored)`,
+	}
+
+	for _, logBody := range testCases {
+		if value, ok := parseResticStoredBytes(logBody); ok || value != 0 {
+			t.Fatalf("expected invalid summary to fail parse, got value=%f ok=%v for %q", value, ok, logBody)
+		}
+	}
+}
+
+func TestHandleUICoversMethodNilRendererAndIndexErrors(t *testing.T) {
+	t.Run("method not allowed", func(t *testing.T) {
+		srv := &Server{}
+		req := httptest.NewRequest(http.MethodPost, "/", nil)
+		res := httptest.NewRecorder()
+
+		srv.handleUI(res, req)
+		if res.Code != http.StatusMethodNotAllowed {
+			t.Fatalf("expected method not allowed, got %d", res.Code)
+		}
+	})
+
+	t.Run("nil renderer", func(t *testing.T) {
+		srv := &Server{}
+		req := httptest.NewRequest(http.MethodGet, "/", nil)
+		res := httptest.NewRecorder()
+
+		srv.handleUI(res, req)
+		if res.Code != http.StatusInternalServerError || !strings.Contains(res.Body.String(), "UI renderer is unavailable") {
+			t.Fatalf("expected nil renderer error, got %d %q", res.Code, res.Body.String())
+		}
+	})
+
+	t.Run("index render failure", func(t *testing.T) {
+		srv := &Server{ui: &uiRenderer{}}
+		req := httptest.NewRequest(http.MethodGet, "/", nil)
+		res := httptest.NewRecorder()
+
+		srv.handleUI(res, req)
+		if res.Code != http.StatusInternalServerError || !strings.Contains(res.Body.String(), "UI assets are not available") {
+			t.Fatalf("expected ui index error, got %d %q", res.Code, res.Body.String())
+		}
+	})
+}
+
 func TestMetricsStayPublic(t *testing.T) {
 	srv := &Server{
 		cfg:      &config.Config{AuthRequired: true, AllowedGroups: []string{"admin"}},