diff --git a/app/backend/internal/api/deployments.go b/app/backend/internal/api/deployments.go
index b95df89..37a4fac 100644
--- a/app/backend/internal/api/deployments.go
+++ b/app/backend/internal/api/deployments.go
@@ -803,9 +803,15 @@ func splitImageReference(image, fallbackTag string) (string, string) {
 		return "", fallbackTag
 	}
 
+	// Digest-pinned refs (name[:tag]@sha256:…) carry no usable tag — the
+	// colon lives inside the digest and must not be split.
+	if strings.Contains(image, "@") {
+		return image, fallbackTag
+	}
+
 	lastSlash := strings.LastIndex(image, "/")
 	lastColon := strings.LastIndex(image, ":")
-	if lastColon > lastSlash && !strings.Contains(image[lastColon:], "@") {
+	if lastColon > lastSlash {
 		return image[:lastColon], image[lastColon+1:]
 	}
 
diff --git a/app/backend/internal/api/deployments_test.go b/app/backend/internal/api/deployments_test.go
new file mode 100644
index 0000000..a3f21f8
--- /dev/null
+++ b/app/backend/internal/api/deployments_test.go
@@ -0,0 +1,46 @@
+package api
+
+import "testing"
+
+func TestSplitImageReference(t *testing.T) {
+	cases := []struct {
+		name      string
+		image     string
+		fallback  string
+		wantImage string
+		wantTag   string
+	}{
+		{"empty uses fallback tag", "", "latest", "", "latest"},
+		{"bare image", "nginx", "latest", "nginx", "latest"},
+		{"tagged image", "nginx:1.27", "latest", "nginx", "1.27"},
+		{"registry with port untagged", "registry.local:5000/app", "latest", "registry.local:5000/app", "latest"},
+		{"registry with port tagged", "registry.local:5000/app:v2", "latest", "registry.local:5000/app", "v2"},
+		{"digest stays whole", "nginx@sha256:abc123", "latest", "nginx@sha256:abc123", "latest"},
+		{"tag and digest", "nginx:1.27@sha256:abc", "latest", "nginx:1.27@sha256:abc", "latest"},
+		{"namespaced tagged", "ghcr.io/owner/repo:dev", "latest", "ghcr.io/owner/repo", "dev"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			img, tag := splitImageReference(tc.image, tc.fallback)
+			if img != tc.wantImage || tag != tc.wantTag {
+				t.Fatalf("splitImageReference(%q, %q) = (%q, %q), want (%q, %q)",
+					tc.image, tc.fallback, img, tag, tc.wantImage, tc.wantTag)
+			}
+		})
+	}
+}
+
+func TestMapEngineStatusToDBStatus(t *testing.T) {
+	cases := map[string]string{
+		"running":   "deployed",
+		"building":  "building",
+		"failed":    "failed",
+		"cancelled": "cancelled",
+		"queued":    "queued",
+	}
+	for in, want := range cases {
+		if got := mapEngineStatusToDBStatus(in); got != want {
+			t.Fatalf("mapEngineStatusToDBStatus(%q) = %q, want %q", in, got, want)
+		}
+	}
+}