Ergaenze Screen-ID-Filter (q=) fuer Uebersicht und Status-API

GET /api/v1/screens/status und GET /status akzeptieren jetzt q=<substring>
zum Filtern der Ergebnisliste nach ScreenID. Der Vergleich ist case-
insensitiv. Leerer Wert bedeutet kein Filter; jeder andere String ist gueltig
(keine Validierung noetig). Die Summary-Counts bleiben unveraendert und
beschreiben weiterhin den gesamten Store-Bestand.

Die Quick-Filter auf /status behalten den aktuellen q-Wert beim Klick, damit
der Textfilter nicht verloren geht wenn man z.B. von "All screens" auf
"Stale reports" wechselt.

Tests: FiltersByScreenIDSubstring, ScreenIDFilterIsCaseInsensitive

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/backend/internal/httpapi/playerstatus.go

@@ -158,6 +158,8 @@ func handleListLatestPlayerStatuses(store playerStatusStore) http.HandlerFunc {
 func buildScreenStatusOverview(store playerStatusStore, query url.Values) (screenStatusOverview, error) {
 	records := store.List()
 
+	screenIDFilter := strings.ToLower(strings.TrimSpace(query.Get("q")))
+
 	wantConnectivity := strings.TrimSpace(query.Get("server_connectivity"))
 	switch wantConnectivity {
 	case "", "online", "degraded", "offline", "unknown":
@@ -202,6 +204,9 @@ func buildScreenStatusOverview(store playerStatusStore, query url.Values) (scree
 		if records[i].Stale {
 			overview.Summary.Stale++
 		}
+		if screenIDFilter != "" && !strings.Contains(strings.ToLower(records[i].ScreenID), screenIDFilter) {
+			continue
+		}
 		if updatedSince != nil && !isUpdatedSince(records[i], *updatedSince) {
 			continue
 		}

server/backend/internal/httpapi/playerstatus_test.go

@@ -579,6 +579,55 @@ func TestHandleListLatestPlayerStatusesAppliesLimit(t *testing.T) {
 	}
 }
 
+func TestHandleListLatestPlayerStatusesFiltersByScreenIDSubstring(t *testing.T) {
+	store := newInMemoryPlayerStatusStore()
+	store.Save(playerStatusRecord{ScreenID: "info01-dev", Timestamp: "2026-03-22T16:00:00Z", Status: "running", ServerConnectivity: "online"})
+	store.Save(playerStatusRecord{ScreenID: "info02-dev", Timestamp: "2026-03-22T16:00:00Z", Status: "running", ServerConnectivity: "online"})
+	store.Save(playerStatusRecord{ScreenID: "lobby-main", Timestamp: "2026-03-22T16:00:00Z", Status: "running", ServerConnectivity: "online"})
+
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/status?q=info", nil)
+	w := httptest.NewRecorder()
+
+	handleListLatestPlayerStatuses(store)(w, req)
+
+	var response struct {
+		Screens []playerStatusRecord `json:"screens"`
+	}
+	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+
+	if got, want := len(response.Screens), 2; got != want {
+		t.Fatalf("len(response.Screens) = %d, want %d", got, want)
+	}
+}
+
+func TestHandleListLatestPlayerStatusesScreenIDFilterIsCaseInsensitive(t *testing.T) {
+	store := newInMemoryPlayerStatusStore()
+	store.Save(playerStatusRecord{ScreenID: "INFO01-DEV", Timestamp: "2026-03-22T16:00:00Z", Status: "running", ServerConnectivity: "online"})
+	store.Save(playerStatusRecord{ScreenID: "lobby-main", Timestamp: "2026-03-22T16:00:00Z", Status: "running", ServerConnectivity: "online"})
+
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/status?q=info01", nil)
+	w := httptest.NewRecorder()
+
+	handleListLatestPlayerStatuses(store)(w, req)
+
+	var response struct {
+		Screens []playerStatusRecord `json:"screens"`
+	}
+	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+
+	if got, want := len(response.Screens), 1; got != want {
+		t.Fatalf("len(response.Screens) = %d, want %d", got, want)
+	}
+
+	if got, want := response.Screens[0].ScreenID, "INFO01-DEV"; got != want {
+		t.Fatalf("response.Screens[0].ScreenID = %q, want %q", got, want)
+	}
+}
+
 func TestHandleListLatestPlayerStatusesRejectsInvalidServerConnectivity(t *testing.T) {
 	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/status?server_connectivity=garbage", nil)
 	w := httptest.NewRecorder()

server/backend/internal/httpapi/statuspage.go

@@ -19,6 +19,7 @@ type statusPageData struct {
 }
 
 type statusPageFilters struct {
+	ScreenIDFilter     string
 	ServerConnectivity string
 	Stale              string
 	UpdatedSince       string
@@ -499,6 +500,11 @@ var statusPageTemplate = template.Must(template.New("status-page").Funcs(statusT
         </div>
 
         <form class="filter-form" method="get" action="{{.StatusPagePath}}">
+          <div class="field full">
+            <label for="q">Screen ID contains</label>
+            <input id="q" name="q" type="text" placeholder="e.g. info01" value="{{.Filters.ScreenIDFilter}}">
+          </div>
+
           <div class="field">
             <label for="server_connectivity">Server connectivity</label>
             <select id="server_connectivity" name="server_connectivity">
@@ -786,6 +792,7 @@ func handleScreenDetailPage(store playerStatusStore) http.HandlerFunc {
 
 func buildStatusPageData(store playerStatusStore, query url.Values, overview screenStatusOverview) statusPageData {
 	filters := statusPageFilters{
+		ScreenIDFilter:     strings.TrimSpace(query.Get("q")),
 		ServerConnectivity: strings.TrimSpace(query.Get("server_connectivity")),
 		Stale:              strings.TrimSpace(query.Get("stale")),
 		UpdatedSince:       strings.TrimSpace(query.Get("updated_since")),
@@ -804,34 +811,35 @@ func buildStatusPageData(store playerStatusStore, query url.Values, overview scr
 }
 
 func buildStatusQuickFilters(filters statusPageFilters) []statusFilterLink {
+	base := statusPageFilters{ScreenIDFilter: filters.ScreenIDFilter, Limit: filters.Limit, UpdatedSince: filters.UpdatedSince}
 	return []statusFilterLink{
 		{
 			Label:  "All screens",
-			Href:   buildStatusPageHref(statusPageFilters{Limit: filters.Limit, UpdatedSince: filters.UpdatedSince}),
+			Href:   buildStatusPageHref(base),
 			Class:  "",
 			Active: filters.ServerConnectivity == "" && filters.Stale == "",
 		},
 		{
 			Label:  "Connectivity offline",
-			Href:   buildStatusPageHref(statusPageFilters{ServerConnectivity: "offline", Limit: filters.Limit, UpdatedSince: filters.UpdatedSince}),
+			Href:   buildStatusPageHref(statusPageFilters{ScreenIDFilter: base.ScreenIDFilter, ServerConnectivity: "offline", Limit: base.Limit, UpdatedSince: base.UpdatedSince}),
 			Class:  "offline",
 			Active: filters.ServerConnectivity == "offline" && filters.Stale == "",
 		},
 		{
 			Label:  "Connectivity degraded",
-			Href:   buildStatusPageHref(statusPageFilters{ServerConnectivity: "degraded", Limit: filters.Limit, UpdatedSince: filters.UpdatedSince}),
+			Href:   buildStatusPageHref(statusPageFilters{ScreenIDFilter: base.ScreenIDFilter, ServerConnectivity: "degraded", Limit: base.Limit, UpdatedSince: base.UpdatedSince}),
 			Class:  "degraded",
 			Active: filters.ServerConnectivity == "degraded" && filters.Stale == "",
 		},
 		{
 			Label:  "Stale reports",
-			Href:   buildStatusPageHref(statusPageFilters{Stale: "true", Limit: filters.Limit, UpdatedSince: filters.UpdatedSince}),
+			Href:   buildStatusPageHref(statusPageFilters{ScreenIDFilter: base.ScreenIDFilter, Stale: "true", Limit: base.Limit, UpdatedSince: base.UpdatedSince}),
 			Class:  "",
 			Active: filters.ServerConnectivity == "" && filters.Stale == "true",
 		},
 		{
 			Label:  "Fresh reports",
-			Href:   buildStatusPageHref(statusPageFilters{Stale: "false", Limit: filters.Limit, UpdatedSince: filters.UpdatedSince}),
+			Href:   buildStatusPageHref(statusPageFilters{ScreenIDFilter: base.ScreenIDFilter, Stale: "false", Limit: base.Limit, UpdatedSince: base.UpdatedSince}),
 			Class:  "online",
 			Active: filters.ServerConnectivity == "" && filters.Stale == "false",
 		},
@@ -844,6 +852,9 @@ func buildStatusPageHref(filters statusPageFilters) string {
 
 func buildOverviewPath(basePath string, filters statusPageFilters) string {
 	query := url.Values{}
+	if filters.ScreenIDFilter != "" {
+		query.Set("q", filters.ScreenIDFilter)
+	}
 	if filters.ServerConnectivity != "" {
 		query.Set("server_connectivity", filters.ServerConnectivity)
 	}