diff --git a/server/backend/internal/store/store.go b/server/backend/internal/store/store.go
index 1d70f8e..a1fb64a 100644
--- a/server/backend/internal/store/store.go
+++ b/server/backend/internal/store/store.go
@@ -34,6 +34,12 @@ type Screen struct {
 	CreatedAt   time.Time `json:"created_at"`
 }
 
+type ScreenStatus struct {
+	ScreenID     string    `json:"screen_id"`
+	DisplayState string    `json:"display_state"`
+	ReportedAt   time.Time `json:"reported_at"`
+}
+
 type MediaAsset struct {
 	ID          string    `json:"id"`
 	TenantID    string    `json:"tenant_id"`
@@ -310,6 +316,18 @@ func scanScreen(row interface {
 	return &sc, nil
 }
 
+// UpsertDisplayState speichert den zuletzt gemeldeten Display-Zustand eines Screens.
+func (s *ScreenStore) UpsertDisplayState(ctx context.Context, screenID, displayState string) error {
+	_, err := s.pool.Exec(ctx,
+		`insert into screen_status (screen_id, display_state, reported_at)
+		 values ($1, $2, now())
+		 on conflict (screen_id) do update
+		   set display_state = excluded.display_state,
+		       reported_at   = excluded.reported_at`,
+		screenID, displayState)
+	return err
+}
+
 // ------------------------------------------------------------------
 // MediaStore
 // ------------------------------------------------------------------