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+# User-spezifische Medien für Restricted Users — Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Restricted Users sehen und verwalten nur eigene Medien; Admins/screen_users sehen alle Medien mit Toggle zum Ein-/Ausblenden von Restricted-Medien.
+
+**Architecture:** Ownership-Feld in DB, Filter im Store-Layer (LEFT JOIN für owner-Info), Rolle-basierte Handler-Logik, clientseitiger JS-Toggle. Neue Hilfsfunktion `canDeleteMedia` für isoliert testbare Berechtigungslogik.
+
+**Tech Stack:** Go (pgx, net/http), PostgreSQL, Go-Templates, Vanilla JS, Bulma CSS
+
+---
+
+## Betroffene Dateien
+
+| Datei | Art |
+|---|---|
+| `server/backend/db/migrations/007_media_owner.sql` | Neu |
+| `server/backend/internal/store/store.go` | Modify — MediaAsset, scanMedia, scanMediaFull, List, Create, Get |
+| `server/backend/internal/httpapi/manage/media.go` | Modify — canDeleteMedia + Handler |
+| `server/backend/internal/httpapi/manage/media_test.go` | Neu — Tests |
+| `server/backend/internal/httpapi/manage/ui.go` | Modify — HandleManageUI, HandleUploadMediaUI, HandleDeleteMediaUI |
+| `server/backend/internal/httpapi/tenant/tenant.go` | Modify — HandleTenantDashboard, HandleTenantUpload |
+| `server/backend/internal/httpapi/manage/templates.go` | Modify — Badge, Toggle, JS |
+| `docs/SCHEMA.md` | Modify |
+| `docs/API-ENDPOINTS.md` | Modify |
+
+---
+
+### Task 1: DB Migration — `created_by_user_id`
+
+**Files:**
+- Create: `server/backend/db/migrations/007_media_owner.sql`
+
+- [ ] **Step 1: Migrationsdatei anlegen**
+
+```sql
+-- 007_media_owner.sql
+-- Fügt Besitzer-Referenz zu media_assets hinzu.
+-- ON DELETE SET NULL: Medium bleibt erhalten wenn User gelöscht wird.
+
+ALTER TABLE media_assets
+  ADD COLUMN created_by_user_id text NULL
+  REFERENCES users(id) ON DELETE SET NULL;
+
+CREATE INDEX idx_media_assets_created_by_user_id
+  ON media_assets(created_by_user_id);
+```
+
+- [ ] **Step 2: Migration ausführen (lokal gegen Dev-DB)**
+
+```bash
+docker compose -f compose/server-stack.yml exec -T db \
+  psql -U morz -d morz -f /dev/stdin < server/backend/db/migrations/007_media_owner.sql
+```
+
+Erwartet: `ALTER TABLE`, `CREATE INDEX`, kein ERROR.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add server/backend/db/migrations/007_media_owner.sql
+git commit -m "feat(db): created_by_user_id zu media_assets hinzufügen"
+```
+
+---
+
+### Task 2: Store-Layer — Struct, Scan, List, Create, Get
+
+**Files:**
+- Modify: `server/backend/internal/store/store.go`
+
+Kontext: `MediaAsset` liegt bei ca. Zeile 52. `scanMedia` bei Zeile 416, `List` bei 370, `Create` bei 400, `Get` bei 391.
+
+- [ ] **Step 1: `MediaAsset`-Struct erweitern**
+
+Aktuelles Struct (Zeilen 52–63) ersetzen durch:
+
+```go
+type MediaAsset struct {
+	ID                string    `json:"id"`
+	TenantID          string    `json:"tenant_id"`
+	Title             string    `json:"title"`
+	Type              string    `json:"type"` // image | video | pdf | web
+	StoragePath       string    `json:"storage_path,omitempty"`
+	OriginalURL       string    `json:"original_url,omitempty"`
+	MimeType          string    `json:"mime_type,omitempty"`
+	SizeBytes         int64     `json:"size_bytes,omitempty"`
+	Enabled           bool      `json:"enabled"`
+	CreatedAt         time.Time `json:"created_at"`
+	CreatedByUserID   string    `json:"created_by_user_id,omitempty"`
+	OwnerIsRestricted bool      `json:"owner_is_restricted,omitempty"`
+	OwnerUsername     string    `json:"owner_username,omitempty"`
+}
+```
+
+- [ ] **Step 2: `scanMedia` aktualisieren (11 Felder, +`created_by_user_id`)**
+
+```go
+func scanMedia(row interface {
+	Scan(dest ...any) error
+}) (*MediaAsset, error) {
+	var m MediaAsset
+	err := row.Scan(&m.ID, &m.TenantID, &m.Title, &m.Type,
+		&m.StoragePath, &m.OriginalURL, &m.MimeType, &m.SizeBytes,
+		&m.Enabled, &m.CreatedAt, &m.CreatedByUserID)
+	if err != nil {
+		return nil, fmt.Errorf("scan media: %w", err)
+	}
+	return &m, nil
+}
+```
+
+- [ ] **Step 3: Neue Funktion `scanMediaFull` direkt nach `scanMedia` einfügen (13 Felder)**
+
+```go
+func scanMediaFull(row interface {
+	Scan(dest ...any) error
+}) (*MediaAsset, error) {
+	var m MediaAsset
+	var ownerRole string
+	err := row.Scan(&m.ID, &m.TenantID, &m.Title, &m.Type,
+		&m.StoragePath, &m.OriginalURL, &m.MimeType, &m.SizeBytes,
+		&m.Enabled, &m.CreatedAt, &m.CreatedByUserID,
+		&ownerRole, &m.OwnerUsername)
+	if err != nil {
+		return nil, fmt.Errorf("scan media full: %w", err)
+	}
+	m.OwnerIsRestricted = ownerRole == "restricted"
+	return &m, nil
+}
+```
+
+- [ ] **Step 4: `MediaStore.List` ersetzen — neue Signatur + LEFT JOIN**
+
+```go
+func (s *MediaStore) List(ctx context.Context, tenantID, ownerUserID string) ([]*MediaAsset, error) {
+	const base = `
+		SELECT m.id, m.tenant_id, m.title, m.type,
+		       coalesce(m.storage_path,''), coalesce(m.original_url,''),
+		       coalesce(m.mime_type,''), coalesce(m.size_bytes,0),
+		       m.enabled, m.created_at, coalesce(m.created_by_user_id,''),
+		       coalesce(u.role,''), coalesce(u.username,'')
+		  FROM media_assets m
+		  LEFT JOIN users u ON m.created_by_user_id = u.id
+		 WHERE m.tenant_id=$1`
+
+	var rows pgx.Rows
+	var err error
+	if ownerUserID != "" {
+		rows, err = s.pool.Query(ctx, base+` AND m.created_by_user_id=$2 ORDER BY m.created_at DESC`, tenantID, ownerUserID)
+	} else {
+		rows, err = s.pool.Query(ctx, base+` ORDER BY m.created_at DESC`, tenantID)
+	}
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []*MediaAsset
+	for rows.Next() {
+		m, err := scanMediaFull(rows)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, m)
+	}
+	return out, rows.Err()
+}
+```
+
+- [ ] **Step 5: `MediaStore.Create` — `createdByUserID` Parameter hinzufügen**
+
+```go
+func (s *MediaStore) Create(ctx context.Context, tenantID, title, assetType, storagePath, originalURL, mimeType, createdByUserID string, sizeBytes int64) (*MediaAsset, error) {
+	row := s.pool.QueryRow(ctx,
+		`INSERT INTO media_assets(tenant_id, title, type, storage_path, original_url, mime_type, size_bytes, created_by_user_id)
+		 VALUES($1,$2,$3,nullif($4,''),nullif($5,''),nullif($6,''),nullif($7,0),nullif($8,''))
+		 RETURNING id, tenant_id, title, type, coalesce(storage_path,''),
+		           coalesce(original_url,''), coalesce(mime_type,''), coalesce(size_bytes,0),
+		           enabled, created_at, coalesce(created_by_user_id,'')`,
+		tenantID, title, assetType, storagePath, originalURL, mimeType, sizeBytes, createdByUserID)
+	return scanMedia(row)
+}
+```
+
+- [ ] **Step 6: `MediaStore.Get` — `created_by_user_id` zur Query hinzufügen**
+
+```go
+func (s *MediaStore) Get(ctx context.Context, id string) (*MediaAsset, error) {
+	row := s.pool.QueryRow(ctx,
+		`SELECT id, tenant_id, title, type, coalesce(storage_path,''),
+		        coalesce(original_url,''), coalesce(mime_type,''), coalesce(size_bytes,0),
+		        enabled, created_at, coalesce(created_by_user_id,'')
+		   FROM media_assets WHERE id=$1`, id)
+	return scanMedia(row)
+}
+```
+
+- [ ] **Step 7: Build prüfen**
+
+```bash
+cd server/backend && go build ./...
+```
+
+Erwartet: keine Fehler. Compilerfehler zeigen alle Call-Sites die noch auf alte Signaturen zeigen.
+
+- [ ] **Step 8: Commit**
+
+```bash
+git add server/backend/internal/store/store.go
+git commit -m "feat(store): MediaAsset-Ownership — List/Create/Get mit created_by_user_id"
+```
+
+---
+
+### Task 3: `manage/media.go` — Handler + `canDeleteMedia` + Tests
+
+**Files:**
+- Modify: `server/backend/internal/httpapi/manage/media.go`
+- Create: `server/backend/internal/httpapi/manage/media_test.go`
+
+- [ ] **Step 1: `canDeleteMedia` Hilfsfunktion am Ende von `media.go` hinzufügen**
+
+```go
+// canDeleteMedia prüft ob User u das Medium asset löschen darf.
+// admin:       immer erlaubt
+// screen_user: Tenant-Match reicht
+// restricted:  Tenant-Match UND Besitzer-Match
+func canDeleteMedia(u *store.User, asset *store.MediaAsset) bool {
+	if u.Role == "admin" {
+		return true
+	}
+	if u.TenantID != asset.TenantID {
+		return false
+	}
+	if u.Role == "restricted" {
+		return asset.CreatedByUserID == u.ID
+	}
+	return true
+}
+```
+
+- [ ] **Step 2: Testdatei anlegen und failing Tests schreiben**
+
+`server/backend/internal/httpapi/manage/media_test.go`:
+
+```go
+package manage
+
+import (
+	"testing"
+
+	"git.az-it.net/az/morz-infoboard/server/backend/internal/store"
+)
+
+func TestCanDeleteMedia(t *testing.T) {
+	asset := &store.MediaAsset{TenantID: "t1", CreatedByUserID: "u1"}
+
+	tests := []struct {
+		name    string
+		user    *store.User
+		allowed bool
+	}{
+		{
+			name:    "admin darf immer",
+			user:    &store.User{Role: "admin", TenantID: "t2", ID: "x"},
+			allowed: true,
+		},
+		{
+			name:    "screen_user eigener Tenant",
+			user:    &store.User{Role: "screen_user", TenantID: "t1", ID: "x"},
+			allowed: true,
+		},
+		{
+			name:    "screen_user fremder Tenant",
+			user:    &store.User{Role: "screen_user", TenantID: "t2", ID: "x"},
+			allowed: false,
+		},
+		{
+			name:    "restricted eigenes Medium",
+			user:    &store.User{Role: "restricted", TenantID: "t1", ID: "u1"},
+			allowed: true,
+		},
+		{
+			name:    "restricted fremdes Medium gleicher Tenant",
+			user:    &store.User{Role: "restricted", TenantID: "t1", ID: "u2"},
+			allowed: false,
+		},
+		{
+			name:    "restricted fremder Tenant",
+			user:    &store.User{Role: "restricted", TenantID: "t2", ID: "u1"},
+			allowed: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := canDeleteMedia(tt.user, asset)
+			if got != tt.allowed {
+				t.Errorf("canDeleteMedia() = %v, want %v", got, tt.allowed)
+			}
+		})
+	}
+}
+```
+
+- [ ] **Step 3: Tests ausführen — müssen FAIL wegen fehlendem `canDeleteMedia`**
+
+```bash
+cd server/backend && go test ./internal/httpapi/manage/... -run TestCanDeleteMedia -v
+```
+
+Erwartet: FAIL (undefined: canDeleteMedia) oder compile error.
+
+- [ ] **Step 4: `canDeleteMedia` ist bereits in Step 1 geschrieben — Tests nochmal ausführen**
+
+```bash
+cd server/backend && go test ./internal/httpapi/manage/... -run TestCanDeleteMedia -v
+```
+
+Erwartet: 6/6 PASS.
+
+- [ ] **Step 5: `HandleListMedia` aktualisieren — ownerUserID nach Rolle setzen**
+
+```go
+func HandleListMedia(tenants *store.TenantStore, media *store.MediaStore) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		tenant, err := tenants.Get(r.Context(), r.PathValue("tenantSlug"))
+		if err != nil {
+			http.Error(w, "tenant not found", http.StatusNotFound)
+			return
+		}
+		u := reqcontext.UserFromContext(r.Context())
+		ownerUserID := ""
+		if u != nil && u.Role == "restricted" {
+			ownerUserID = u.ID
+		}
+		assets, err := media.List(r.Context(), tenant.ID, ownerUserID)
+		if err != nil {
+			http.Error(w, "db error", http.StatusInternalServerError)
+			return
+		}
+		if assets == nil {
+			assets = []*store.MediaAsset{}
+		}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(assets) //nolint:errcheck
+	}
+}
+```
+
+- [ ] **Step 6: `HandleUploadMedia` aktualisieren — user.ID an Create übergeben**
+
+Beide `media.Create`-Aufrufe in der Funktion müssen `createdByUserID` erhalten. Den User am Anfang der Funktion extrahieren, dann an beide Create-Calls anhängen:
+
+```go
+func HandleUploadMedia(tenants *store.TenantStore, media *store.MediaStore, uploadDir string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		tenant, err := tenants.Get(r.Context(), r.PathValue("tenantSlug"))
+		if err != nil {
+			http.Error(w, "tenant not found", http.StatusNotFound)
+			return
+		}
+		tenantID := tenant.ID
+
+		u := reqcontext.UserFromContext(r.Context())
+		createdByUserID := ""
+		if u != nil {
+			createdByUserID = u.ID
+		}
+
+		// W3: MaxBytesReader begrenzt den gesamten Request-Body auf maxUploadSize.
+		r.Body = http.MaxBytesReader(w, r.Body, maxUploadSize)
+		if err := r.ParseMultipartForm(maxUploadSize); err != nil {
+			http.Error(w, "request too large or not multipart", http.StatusBadRequest)
+			return
+		}
+
+		assetType := strings.TrimSpace(r.FormValue("type"))
+		title := strings.TrimSpace(r.FormValue("title"))
+
+		switch assetType {
+		case "web":
+			url := strings.TrimSpace(r.FormValue("url"))
+			if url == "" {
+				http.Error(w, "url required for type=web", http.StatusBadRequest)
+				return
+			}
+			if title == "" {
+				title = url
+			}
+			asset, err := media.Create(r.Context(), tenantID, title, "web", "", url, "", createdByUserID, 0)
+			if err != nil {
+				http.Error(w, "db error", http.StatusInternalServerError)
+				return
+			}
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusCreated)
+			json.NewEncoder(w).Encode(asset) //nolint:errcheck
+			return
+
+		case "image", "video", "pdf":
+			file, header, err := r.FormFile("file")
+			if err != nil {
+				http.Error(w, "file required for type="+assetType, http.StatusBadRequest)
+				return
+			}
+			defer file.Close()
+
+			mimeType := header.Header.Get("Content-Type")
+			if detectedType := mimeToAssetType(mimeType); detectedType != "" {
+				assetType = detectedType
+			}
+			if title == "" {
+				title = strings.TrimSuffix(header.Filename, filepath.Ext(header.Filename))
+			}
+
+			storagePath, size, err := fileutil.SaveUploadedFile(file, header.Filename, title, uploadDir, r.PathValue("tenantSlug"))
+			if err != nil {
+				http.Error(w, "storage error", http.StatusInternalServerError)
+				return
+			}
+
+			asset, err := media.Create(r.Context(), tenantID, title, assetType, storagePath, "", mimeType, createdByUserID, size)
+			if err != nil {
+				http.Error(w, "db error", http.StatusInternalServerError)
+				return
+			}
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusCreated)
+			json.NewEncoder(w).Encode(asset) //nolint:errcheck
+
+		default:
+			http.Error(w, "type must be one of: image, video, pdf, web", http.StatusBadRequest)
+		}
+	}
+}
+```
+
+- [ ] **Step 7: `HandleDeleteMedia` aktualisieren — `canDeleteMedia` verwenden**
+
+Den aktuellen K3-Block (ab `u := reqcontext...`) ersetzen:
+
+```go
+func HandleDeleteMedia(media *store.MediaStore, uploadDir string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		id := r.PathValue("id")
+		asset, err := media.Get(r.Context(), id)
+		if err != nil {
+			http.Error(w, "not found", http.StatusNotFound)
+			return
+		}
+
+		// K3: Rolle-bewusste Berechtigungsprüfung.
+		u := reqcontext.UserFromContext(r.Context())
+		if u == nil || !canDeleteMedia(u, asset) {
+			http.Error(w, "Forbidden", http.StatusForbidden)
+			return
+		}
+
+		if asset.StoragePath != "" {
+			filename := filepath.Base(asset.StoragePath)
+			os.Remove(filepath.Join(uploadDir, filename)) //nolint:errcheck
+		}
+
+		if err := media.Delete(r.Context(), id); err != nil {
+			http.Error(w, "db error", http.StatusInternalServerError)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}
+}
+```
+
+- [ ] **Step 8: Build + Tests**
+
+```bash
+cd server/backend && go build ./... && go test ./internal/httpapi/manage/... -v
+```
+
+Erwartet: kein Compilerfehler, alle Tests PASS.
+
+- [ ] **Step 9: Commit**
+
+```bash
+git add server/backend/internal/httpapi/manage/media.go \
+        server/backend/internal/httpapi/manage/media_test.go
+git commit -m "feat(manage): canDeleteMedia + handler role-awareness für restricted users"
+```
+
+---
+
+### Task 4: `manage/ui.go` — HandleManageUI, HandleUploadMediaUI, HandleDeleteMediaUI
+
+**Files:**
+- Modify: `server/backend/internal/httpapi/manage/ui.go`
+
+- [ ] **Step 1: `HandleManageUI` — `media.List` Call anpassen (ca. Zeile 397)**
+
+Den Block:
+```go
+assets, err := media.List(r.Context(), screen.TenantID)
+```
+ersetzen durch:
+```go
+ownerUserID := ""
+if u := reqcontext.UserFromContext(r.Context()); u != nil && u.Role == "restricted" {
+    ownerUserID = u.ID
+}
+assets, err := media.List(r.Context(), screen.TenantID, ownerUserID)
+```
+
+Hinweis: `u` wird weiter unten (Zeile ~437) nochmal aus Context gelesen — das ist kein Problem, `reqcontext.UserFromContext` ist idempotent.
+
+- [ ] **Step 2: `HandleUploadMediaUI` — `createdByUserID` an Create-Aufrufe übergeben**
+
+Am Anfang des Handlers (nach dem Tenant-Slug-Block, ca. Zeile 622) existiert bereits:
+```go
+if u := reqcontext.UserFromContext(r.Context()); u != nil && u.TenantSlug != "" {
+    tenantSlug = u.TenantSlug
+}
+```
+
+Direkt danach `createdByUserID` extrahieren:
+```go
+createdByUserID := ""
+if u := reqcontext.UserFromContext(r.Context()); u != nil {
+    createdByUserID = u.ID
+}
+```
+
+Dann beide `media.Create`-Aufrufe (Zeilen 640 und 658) anpassen:
+
+```go
+// web-Zweig (Zeile ~640):
+_, err = media.Create(r.Context(), screen.TenantID, title, "web", "", url, "", createdByUserID, 0)
+
+// file-Zweig (Zeile ~658):
+_, err = media.Create(r.Context(), screen.TenantID, title, assetType, storagePath, "", mimeType, createdByUserID, size)
+```
+
+- [ ] **Step 3: `HandleDeleteMediaUI` — K3-Check für restricted users hinzufügen**
+
+Nach dem `asset, err := media.Get(...)` Block (ca. Zeile 862) einfügen:
+
+```go
+// K3: Restricted User darf nur eigene Medien löschen.
+if u := reqcontext.UserFromContext(r.Context()); u != nil && !canDeleteMedia(u, asset) {
+    http.Error(w, "Forbidden", http.StatusForbidden)
+    return
+}
+```
+
+- [ ] **Step 4: Build**
+
+```bash
+cd server/backend && go build ./...
+```
+
+Erwartet: kein Fehler.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add server/backend/internal/httpapi/manage/ui.go
+git commit -m "feat(ui): manage-Handler — restricted-aware List/Create/Delete"
+```
+
+---
+
+### Task 5: `tenant/tenant.go` — HandleTenantDashboard + HandleTenantUpload
+
+**Files:**
+- Modify: `server/backend/internal/httpapi/tenant/tenant.go`
+
+- [ ] **Step 1: `HandleTenantDashboard` — List-Call anpassen (Zeile ~76)**
+
+```go
+// Vorher:
+assets, err := mediaStore.List(r.Context(), tenant.ID)
+
+// Nachher:
+assets, err := mediaStore.List(r.Context(), tenant.ID, "")
+```
+
+Tenant-Dashboard wird nur von Admins und screen_users genutzt (restricted users landen auf `/manage/{screenSlug}`), daher kein ownerUserID-Filter nötig.
+
+- [ ] **Step 2: `HandleTenantUpload` — `createdByUserID` an Create-Aufrufe übergeben**
+
+Am Anfang des Handlers (nach `tenantSlug` Extraktion) einfügen:
+
+```go
+createdByUserID := ""
+if u := reqcontext.UserFromContext(r.Context()); u != nil {
+    createdByUserID = u.ID
+}
+```
+
+Beide `mediaStore.Create`-Aufrufe (Zeilen ~161 und ~185) anpassen:
+
+```go
+// web-Zweig (~Zeile 161):
+_, err = mediaStore.Create(r.Context(), tenant.ID, title, "web", "", url, "", createdByUserID, 0)
+
+// file-Zweig (~Zeile 185):
+_, err = mediaStore.Create(r.Context(), tenant.ID, title, assetType, storagePath, "", mimeType, createdByUserID, size)
+```
+
+- [ ] **Step 3: Build**
+
+```bash
+cd server/backend && go build ./...
+```
+
+Erwartet: kein Fehler.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add server/backend/internal/httpapi/tenant/tenant.go
+git commit -m "feat(tenant): List/Create mit owner-Feld aktualisiert"
+```
+
+---
+
+### Task 6: `templates.go` — Badge, Toggle, JS
+
+**Files:**
+- Modify: `server/backend/internal/httpapi/manage/templates.go`
+
+Kontext: Die Medienbibliothek liegt ab ca. Zeile 1083. Zeilen-Nummern können abweichen — suche nach `<!-- Library -->` als Anker.
+
+- [ ] **Step 1: CSS für versteckte Restricted-Medien hinzufügen**
+
+Suche die Upload-Zone CSS-Sektion (ca. Zeile 779, `.upload-zone { ... }`). Direkt **danach** einfügen:
+
+```css
+/* Restricted-Medien: standardmäßig ausgeblendet */
+.lib-card[data-owner-restricted="true"] { display: none; }
+.show-restricted .lib-card[data-owner-restricted="true"] { display: flex; }
+```
+
+- [ ] **Step 2: Toggle-Button und Medienbibliothek-Header anpassen**
+
+Suche den Block `<!-- Library -->` (enthält `<h2 class="title is-6 mb-3">Medienbibliothek</h2>`).
+
+Den `<div class="box">` Block ersetzen durch:
+
+```html
+<div class="box">
+  <div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem">
+    <h2 class="title is-6 mb-0">Medienbibliothek</h2>
+    {{if ne .UserRole "restricted"}}
+    <button id="toggle-restricted-btn" class="button is-small is-light"
+      onclick="toggleRestrictedMedia(this)"
+      style="font-size:.75rem">
+      Restricted-Medien anzeigen
+    </button>
+    {{end}}
+  </div>
+```
+
+- [ ] **Step 3: `lib-card` mit `data-owner-restricted` und Besitzer-Badge versehen**
+
+Den `<div class="lib-card">` innerhalb von `{{range .Assets}}` ersetzen durch:
+
+```html
+<div class="lib-card" data-owner-restricted="{{.OwnerIsRestricted}}">
+```
+
+In `<div class="lib-info">` nach dem `<div class="lib-title"...>` folgendes einfügen:
+
+```html
+<div class="lib-badge">{{typeIcon .Type}} {{.Type}}
+  {{if .OwnerIsRestricted}}<span class="tag is-info is-light ml-1" style="font-size:.65rem">{{.OwnerUsername}}</span>{{end}}
+  {{if and (eq $.UserRole "admin") (not .CreatedByUserID)}}<span class="tag is-warning is-light ml-1" style="font-size:.65rem">Kein Besitzer</span>{{end}}
+</div>
+```
+
+Hinweis: `not` ist eine eingebaute Go-Template-Funktion. Alternativ `{{if eq .CreatedByUserID ""}}`.
+
+- [ ] **Step 4: `not` Template-Funktion prüfen — Go-Templates haben kein `not`**
+
+Go-Templates kennen kein `not`. Den Ausdruck von Step 3 für "Kein Besitzer" ersetzen durch:
+
+```html
+{{if and (eq $.UserRole "admin") (eq .CreatedByUserID "")}}<span class="tag is-warning is-light ml-1" style="font-size:.65rem">Kein Besitzer</span>{{end}}
+```
+
+- [ ] **Step 5: JS-Toggle-Funktion hinzufügen**
+
+Suche die vorhandene JS-Sektion (ca. Zeile 652, enthält `var texts = {...}`). Direkt am Ende des `<script>`-Blocks (vor `</script>`) einfügen:
+
+```javascript
+function toggleRestrictedMedia(btn) {
+  var lib = document.querySelector('.lib-grid');
+  if (!lib) return;
+  var showing = lib.classList.toggle('show-restricted');
+  btn.textContent = showing ? 'Restricted-Medien ausblenden' : 'Restricted-Medien anzeigen';
+  btn.classList.toggle('is-info', showing);
+  btn.classList.toggle('is-light', !showing);
+}
+```
+
+- [ ] **Step 6: Build + Template-Syntax prüfen**
+
+```bash
+cd server/backend && go build ./...
+```
+
+Erwartet: kein Fehler. Go-Templates werden erst zur Laufzeit geparst — Syntax-Fehler erscheinen erst beim ersten Request.
+
+- [ ] **Step 7: Manuell testen**
+
+```bash
+docker compose -f compose/server-stack.yml up --build -d backend
+```
+
+1. Als Restricted User einloggen → Upload ein Medium → nur eigenes Medium sichtbar, kein Toggle-Button
+2. Als Admin einloggen → alle Medien sehen → Toggle-Button vorhanden → anklicken → Restricted-Medien erscheinen mit Besitzer-Badge → Legacy-Medien haben "Kein Besitzer" Badge
+3. Als screen_user einloggen → Restricted-Medien ausgeblendet → Toggle zeigt sie an mit Besitzer-Namen
+
+- [ ] **Step 8: Commit**
+
+```bash
+git add server/backend/internal/httpapi/manage/templates.go
+git commit -m "feat(ui): Restricted-Medien Toggle + Besitzer-Badge + Kein-Besitzer-Badge"
+```
+
+---
+
+### Task 7: Dokumentation
+
+**Files:**
+- Modify: `docs/SCHEMA.md`
+- Modify: `docs/API-ENDPOINTS.md`
+
+- [ ] **Step 1: `docs/SCHEMA.md` — `created_by_user_id` bei `media_assets` ergänzen**
+
+Die `media_assets`-Spalten-Liste (ca. Zeile 258–280 in SCHEMA.md) um folgende Zeile ergänzen:
+
+```
+created_by_user_id text null references users(id) on delete set null
+```
+
+Direkt nach `tenant_id`. Außerdem unter "Wichtige Indizes" ergänzen:
+
+```sql
+create index idx_media_assets_created_by_user_id on media_assets(created_by_user_id);
+```
+
+- [ ] **Step 2: `docs/API-ENDPOINTS.md` — Media-Endpoints dokumentieren**
+
+Im Abschnitt "Media" (falls nicht vorhanden: anlegen nach dem bestehenden Abschnitt) hinzufügen:
+
+```markdown
+## Media
+
+### GET /api/v1/tenants/{tenantSlug}/media
+
+Listet alle Medien eines Tenants.
+
+**Rolle `restricted`:** Gibt nur Medien zurück, die der eingeloggte User selbst hochgeladen hat (`created_by_user_id = user.id`).
+
+**Alle anderen Rollen:** Alle Medien des Tenants. Response-Felder `owner_is_restricted` und `owner_username` sind befüllt wenn das Medium von einem Restricted-User hochgeladen wurde.
+
+### POST /api/v1/tenants/{tenantSlug}/media
+
+Lädt ein Medium hoch oder registriert eine URL. Setzt `created_by_user_id` auf die ID des eingeloggten Users.
+
+### DELETE /api/v1/media/{id}
+
+Löscht ein Medium.
+
+- **Admin:** immer erlaubt
+- **screen_user:** erlaubt wenn `asset.tenant_id == user.tenant_id`
+- **restricted:** erlaubt nur wenn `asset.created_by_user_id == user.id` (eigenes Medium)
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add docs/SCHEMA.md docs/API-ENDPOINTS.md
+git commit -m "docs: media_assets.created_by_user_id + Berechtigungslogik dokumentiert"
+```