diff --git a/backend/media_storage.py b/backend/media_storage.py
index b38275d..7eac9de 100644
--- a/backend/media_storage.py
+++ b/backend/media_storage.py
@@ -63,16 +63,17 @@ def library_storage_key(
     club_id: Optional[int],
     sha256_hex: str,
     ext: str,
+    *,
+    uploader_profile_id: Optional[int] = None,
 ) -> str:
     """
     Relativer Speicherpfad unter MEDIA_ROOT für lokale media_assets.
 
-    Layout (nach Verein gegliedert, globale Medien getrennt):
-    - private → library/club/c{club_id}/private/{sha256}{ext}
-    - club (Vereinssichtbarkeit) → library/club/c{club_id}/shared/{sha256}{ext}
     - official → library/official/{sha256}{ext}
+    - club (vereinsgeteilt) → library/club/c{club_id}/{sha256}{ext}
+    - private (nur Hochlader, Governance unverändert) → library/club/c{club_id}/u{profile}/{sha256}{ext}
 
-    club_id ist bei private/club zwingend (Vereinsordner); bei official nicht genutzt.
+    Kein Ordnername „private“ auf der Platte: Zuordnung erfolgt über Uploader unter dem Verein.
     """
     vis = (visibility or "private").strip().lower()
     if vis not in ("private", "club", "official"):
@@ -99,9 +100,14 @@ def library_storage_key(
     cid = int(club_id)
     if cid < 1:
         raise ValueError("club_id muss eine positive Ganzzahl sein")
-    if vis == "private":
-        return f"library/club/c{cid}/private/{blob}"
-    return f"library/club/c{cid}/shared/{blob}"
+    if vis == "club":
+        return f"library/club/c{cid}/{blob}"
+    if uploader_profile_id is None:
+        raise ValueError("uploader_profile_id ist für private Medien erforderlich (Ordner u{…} unter dem Verein)")
+    up = int(uploader_profile_id)
+    if up < 1:
+        raise ValueError("uploader_profile_id muss positiv sein")
+    return f"library/club/c{cid}/u{up}/{blob}"
 
 
 def relocate_local_media_file(media_root: Path, old_storage_key: str, new_storage_key: str) -> None:
diff --git a/backend/routers/exercises.py b/backend/routers/exercises.py
index 1c9413e..cf478e7 100644
--- a/backend/routers/exercises.py
+++ b/backend/routers/exercises.py
@@ -2415,13 +2415,23 @@ async def upload_exercise_media(
                     raise HTTPException(status_code=400, detail="Vereinsübung ohne club_id")
                 dedupe_club = int(ex_club)
 
-            cur.execute(
-                """SELECT id, storage_key, byte_size, lifecycle_state, original_filename FROM media_assets
-                   WHERE sha256 = %s AND lower(trim(visibility)) = %s
-                     AND (club_id IS NOT DISTINCT FROM %s)
-                   LIMIT 1""",
-                (full_sha, ex_vis, dedupe_club),
-            )
+            if ex_vis == "private":
+                cur.execute(
+                    """SELECT id, storage_key, byte_size, lifecycle_state, original_filename FROM media_assets
+                       WHERE sha256 = %s AND lower(trim(visibility)) = 'private'
+                         AND (club_id IS NOT DISTINCT FROM %s)
+                         AND (uploaded_by_profile_id IS NOT DISTINCT FROM %s)
+                       LIMIT 1""",
+                    (full_sha, dedupe_club, profile_id),
+                )
+            else:
+                cur.execute(
+                    """SELECT id, storage_key, byte_size, lifecycle_state, original_filename FROM media_assets
+                       WHERE sha256 = %s AND lower(trim(visibility)) = %s
+                         AND (club_id IS NOT DISTINCT FROM %s)
+                       LIMIT 1""",
+                    (full_sha, ex_vis, dedupe_club),
+                )
             existing_asset = cur.fetchone()
 
             if existing_asset:
@@ -2509,7 +2519,13 @@ async def upload_exercise_media(
                     )
             else:
                 try:
-                    storage_key = library_storage_key(ex_vis, dedupe_club if ex_vis != "official" else None, full_sha, ext)
+                    storage_key = library_storage_key(
+                        ex_vis,
+                        dedupe_club if ex_vis != "official" else None,
+                        full_sha,
+                        ext,
+                        uploader_profile_id=profile_id if ex_vis == "private" else None,
+                    )
                 except ValueError as e:
                     raise HTTPException(status_code=400, detail=str(e)) from e
                 dest_path = path_under_media_root(media_root, storage_key)
diff --git a/backend/routers/media_assets.py b/backend/routers/media_assets.py
index 5886a24..b5ed2a5 100644
--- a/backend/routers/media_assets.py
+++ b/backend/routers/media_assets.py
@@ -332,7 +332,15 @@ def _relocate_asset_file_if_governance_changed(
         return None
     ext = Path(old_key.replace("\\", "/")).suffix or ".bin"
     try:
-        new_key = library_storage_key(next_vis, next_club_id, sha, ext)
+        up = asset.get("uploaded_by_profile_id")
+        up_i = int(up) if up is not None else None
+        new_key = library_storage_key(
+            next_vis,
+            next_club_id if next_vis != "official" else None,
+            sha,
+            ext,
+            uploader_profile_id=up_i if next_vis == "private" else None,
+        )
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e)) from e
     old_norm = old_key.replace("\\", "/").lstrip("/")
@@ -557,13 +565,23 @@ def _ingest_library_media_file(
         raise HTTPException(status_code=400, detail=str(e)) from e
 
     full_sha = hashlib.sha256(raw).hexdigest()
-    cur.execute(
-        """SELECT id, storage_key, byte_size, lifecycle_state, original_filename FROM media_assets
-           WHERE sha256 = %s AND lower(trim(visibility)) = %s
-             AND (club_id IS NOT DISTINCT FROM %s)
-           LIMIT 1""",
-        (full_sha, vis, next_cid),
-    )
+    if vis == "private":
+        cur.execute(
+            """SELECT id, storage_key, byte_size, lifecycle_state, original_filename FROM media_assets
+               WHERE sha256 = %s AND lower(trim(visibility)) = %s
+                 AND (club_id IS NOT DISTINCT FROM %s)
+                 AND (uploaded_by_profile_id IS NOT DISTINCT FROM %s)
+               LIMIT 1""",
+            (full_sha, vis, next_cid, profile_id),
+        )
+    else:
+        cur.execute(
+            """SELECT id, storage_key, byte_size, lifecycle_state, original_filename FROM media_assets
+               WHERE sha256 = %s AND lower(trim(visibility)) = %s
+                 AND (club_id IS NOT DISTINCT FROM %s)
+               LIMIT 1""",
+            (full_sha, vis, next_cid),
+        )
     existing_asset = cur.fetchone()
 
     if existing_asset:
@@ -606,7 +624,13 @@ def _ingest_library_media_file(
 
     media_root = get_effective_media_root(cur)
     try:
-        storage_key = library_storage_key(vis, next_cid, full_sha, ext)
+        storage_key = library_storage_key(
+            vis,
+            next_cid,
+            full_sha,
+            ext,
+            uploader_profile_id=profile_id if vis == "private" else None,
+        )
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e)) from e
     dest_path = path_under_media_root(media_root, storage_key)
diff --git a/backend/tests/test_library_storage_key.py b/backend/tests/test_library_storage_key.py
index 127ec25..1cfe84e 100644
--- a/backend/tests/test_library_storage_key.py
+++ b/backend/tests/test_library_storage_key.py
@@ -8,25 +8,36 @@ from media_storage import library_storage_key
 _HEX64 = "a" * 64
 
 
-def test_library_storage_key_private_under_club() -> None:
-    assert library_storage_key("private", 7, _HEX64, ".jpg") == f"library/club/c7/private/{_HEX64}.jpg"
+def test_library_storage_key_private_is_uploader_under_club() -> None:
+    assert (
+        library_storage_key("private", 7, _HEX64, ".jpg", uploader_profile_id=99)
+        == f"library/club/c7/u99/{_HEX64}.jpg"
+    )
 
 
-def test_library_storage_key_shared_under_club() -> None:
-    assert library_storage_key("club", 42, _HEX64, ".png") == f"library/club/c42/shared/{_HEX64}.png"
+def test_library_storage_key_club_flat_under_club() -> None:
+    assert library_storage_key("club", 42, _HEX64, ".png") == f"library/club/c42/{_HEX64}.png"
 
 
 def test_library_storage_key_official() -> None:
-    assert library_storage_key("official", None, _HEX64, ".mp4") == f"library/official/{_HEX64}.mp4"
+    assert (
+        library_storage_key("official", None, _HEX64, ".mp4", uploader_profile_id=1)
+        == f"library/official/{_HEX64}.mp4"
+    )
 
 
 def test_library_storage_key_normalizes_visibility() -> None:
-    assert library_storage_key("  CLUB ", 1, _HEX64, "pdf") == f"library/club/c1/shared/{_HEX64}.pdf"
+    assert library_storage_key("  CLUB ", 1, _HEX64, "pdf") == f"library/club/c1/{_HEX64}.pdf"
+
+
+def test_library_storage_key_private_requires_uploader() -> None:
+    with pytest.raises(ValueError, match="uploader_profile_id"):
+        library_storage_key("private", 1, _HEX64, ".jpg")
 
 
 def test_library_storage_key_private_requires_club() -> None:
     with pytest.raises(ValueError, match="Verein"):
-        library_storage_key("private", None, _HEX64, ".jpg")
+        library_storage_key("private", None, _HEX64, ".jpg", uploader_profile_id=1)
 
 
 def test_library_storage_key_club_requires_id() -> None:
@@ -46,9 +57,9 @@ def test_library_storage_key_invalid_visibility() -> None:
 
 def test_library_storage_key_invalid_sha() -> None:
     with pytest.raises(ValueError, match="64"):
-        library_storage_key("private", 1, "deadbeef", ".jpg")
+        library_storage_key("private", 1, "deadbeef", ".jpg", uploader_profile_id=1)
 
 
-def test_library_storage_key_extension_sanitized() -> None:
+def test_library_storage_key_extension() -> None:
     with pytest.raises(ValueError):
-        library_storage_key("private", 1, _HEX64, "../x")
+        library_storage_key("private", 1, _HEX64, "../x", uploader_profile_id=1)
diff --git a/backend/tests/test_media_assets_archive.py b/backend/tests/test_media_assets_archive.py
index 070b010..979192d 100644
--- a/backend/tests/test_media_assets_archive.py
+++ b/backend/tests/test_media_assets_archive.py
@@ -18,7 +18,7 @@ from tenant_context import TenantContext, get_tenant_context
 # Gültige storage_key-Beispiele (64 Hex-Zeichen wie echter SHA-256)
 _SK_OFF_A = f"library/official/{'a' * 64}.jpg"
 _SK_OFF_B = f"library/official/{'b' * 64}.jpg"
-_SK_PRIV_C = f"library/club/c1/private/{'c' * 64}.mp4"
+_SK_PRIV_C = f"library/club/c1/u1/{'c' * 64}.mp4"
 
 
 @pytest.fixture
diff --git a/backend/version.py b/backend/version.py
index e4407b1..950a3be 100644
--- a/backend/version.py
+++ b/backend/version.py
@@ -1,8 +1,8 @@
 # Shinkan Jinkendo Version Information
 
-APP_VERSION = "0.8.53"
+APP_VERSION = "0.8.54"
 BUILD_DATE = "2026-05-08"
-DB_SCHEMA_VERSION = "20260508048"
+DB_SCHEMA_VERSION = "20260508049"
 
 MODULE_VERSIONS = {
     "auth": "1.2.1",  # Login-Rate-Limit 30/minute pro IP (vorher 5/minute)
@@ -13,11 +13,11 @@ MODULE_VERSIONS = {
     "club_join_requests": "1.0.1",  # Depends(get_tenant_context)
     "admin_users": "1.0.0",  # GET /api/admin/users
     "platform_media_storage": "1.0.0",  # GET/PUT /api/admin/platform-media-storage (Superadmin-Pfad unter MEDIA_ROOT)
-    "media_assets": "1.8.0",  # private unter library/club/c*/private; club → …/shared; Vereinskontext Pflicht
+    "media_assets": "1.9.0",  # club: flach unter library/club/c*; private: …/u{profile}/; Dedupe private + uploader
     "groups": "0.1.0",
     "skills": "0.1.0",
     "methods": "0.1.0",
-    "exercises": "2.17.1",  # Übungsmedien: dedupe_club für private aus Übung oder X-Active-Club-Id
+    "exercises": "2.17.2",  # Dedupe private + uploaded_by; storage_key mit uploader_profile_id
     "training_units": "0.2.0",
     "training_programs": "0.1.0",
     "planning": "0.8.1",  # Vorlagen Leseprüfung library_content_visible_to_profile
@@ -29,6 +29,13 @@ MODULE_VERSIONS = {
 }
 
 CHANGELOG = [
+    {
+        "version": "0.8.54",
+        "date": "2026-05-08",
+        "changes": [
+            "Medienpfade: vereinsgeteilt (club) direkt unter library/club/c{id}/; private unter library/club/c{id}/u{profile}/ (kein Ordner „private“/„shared“); Dedupe private inkl. uploaded_by_profile_id",
+        ],
+    },
     {
         "version": "0.8.53",
         "date": "2026-05-08",