From 60709df615988e983f364fc5527ab0991e7dc073 Mon Sep 17 00:00:00 2001
From: Lars <Lars@stommer.de>
Date: Mon, 11 May 2026 17:54:53 +0200
Subject: [PATCH] feat: Implement Content Reporting Backend

- Added new API endpoints for content reporting, including submission, retrieval, and status updates.
- Created database migration for `content_reports` table to store report data.
- Integrated content reports into the existing admin inbox for better management.
- Implemented validation for report submissions, including required fields and email format.
- Added tests for content reporting functionality, covering various scenarios and edge cases.
- Updated frontend API utility to include new content report methods.
- Bumped app version to 0.8.87 and updated relevant page versions.
---
 backend/main.py                            |   3 +-
 backend/migrations/052_content_reports.sql |  73 +++
 backend/routers/content_reports.py         | 584 +++++++++++++++++++++
 backend/tests/test_p13_content_reports.py  | 327 ++++++++++++
 backend/version.py                         |  16 +-
 docs/compliance-implementation.md          |  51 +-
 docs/compliance-package-register.md        |  20 +-
 docs/compliance-roadmap.md                 |  28 +-
 frontend/src/context/OrgInboxContext.jsx   |  66 ++-
 frontend/src/pages/InboxPage.jsx           | 543 ++++++++++++++++---
 frontend/src/utils/api.js                  |  12 +
 frontend/src/version.js                    |   3 +-
 12 files changed, 1610 insertions(+), 116 deletions(-)
 create mode 100644 backend/migrations/052_content_reports.sql
 create mode 100644 backend/routers/content_reports.py
 create mode 100644 backend/tests/test_p13_content_reports.py

diff --git a/backend/main.py b/backend/main.py
index 6829f9b..10547ec 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -193,7 +193,7 @@ def read_root():
     return out
 
 # Register routers
-from routers import auth, profiles, exercises, exercise_progression_graphs, clubs, club_memberships, club_join_requests, admin_users, platform_media_storage, media_assets, skills, training_planning, training_framework_programs, catalogs, maturity_models, matrix_stack_bundle, import_wiki, import_wiki_admin, legal_documents
+from routers import auth, profiles, exercises, exercise_progression_graphs, clubs, club_memberships, club_join_requests, admin_users, platform_media_storage, media_assets, skills, training_planning, training_framework_programs, catalogs, maturity_models, matrix_stack_bundle, import_wiki, import_wiki_admin, legal_documents, content_reports
 
 app.include_router(auth.router)
 app.include_router(profiles.router)
@@ -216,6 +216,7 @@ app.include_router(matrix_stack_bundle.router)
 app.include_router(import_wiki.router)
 app.include_router(import_wiki_admin.router)
 app.include_router(legal_documents.router)
+app.include_router(content_reports.router)
 
 # Lokale Übungs-Medien: standardmäßig nur über geschützten API-Pfad
 # GET /api/exercises/{id}/media/{mid}/file (?ssetoken für <img>/<video>).
diff --git a/backend/migrations/052_content_reports.sql b/backend/migrations/052_content_reports.sql
new file mode 100644
index 0000000..f250f17
--- /dev/null
+++ b/backend/migrations/052_content_reports.sql
@@ -0,0 +1,73 @@
+-- P-13: Content-Melde-Backend
+-- Meldungen rechtswidriger Inhalte (DSA-konformes Meldeverfahren, KRIT-03)
+--
+-- Architektur: Diese Tabelle traegt alle fachlichen Report-Daten.
+-- Die bestehende Admin-Inbox (InboxPage.jsx, GET /api/me/inbox/join-requests)
+-- wird um einen zweiten Abschnitt erweitert, der Content-Reports anzeigt.
+-- Keine separate Admin-Queue, keine generische inbox_items-Tabelle.
+
+CREATE TABLE IF NOT EXISTS content_reports (
+    id SERIAL PRIMARY KEY,
+
+    -- Ziel der Meldung (erweiterbar auf weitere Typen)
+    target_type VARCHAR(20) NOT NULL DEFAULT 'media_asset'
+        CHECK (target_type IN ('media_asset', 'exercise')),
+    target_id INTEGER NOT NULL,
+
+    -- Meldungsinhalt
+    report_reason VARCHAR(50) NOT NULL
+        CHECK (report_reason IN (
+            'copyright',
+            'image_rights',
+            'privacy',
+            'minors',
+            'illegal_content',
+            'youth_protection',
+            'offensive_content',
+            'other'
+        )),
+    report_description TEXT NOT NULL,
+
+    -- Meldende Person (Name + E-Mail Pflicht; Profil optional bei eingeloggten Nutzern)
+    reporter_name VARCHAR(200) NOT NULL,
+    reporter_email VARCHAR(200) NOT NULL,
+    reporter_profile_id INTEGER REFERENCES profiles(id) ON DELETE SET NULL,
+
+    -- Gutglaubenserklärung (Pflicht)
+    good_faith_confirmed BOOLEAN NOT NULL DEFAULT FALSE,
+
+    -- Automatische Priorisierung (high fuer minors/youth_protection/illegal_content)
+    priority VARCHAR(20) NOT NULL DEFAULT 'normal'
+        CHECK (priority IN ('high', 'normal')),
+
+    -- Workflow-Status
+    status VARCHAR(30) NOT NULL DEFAULT 'submitted'
+        CHECK (status IN (
+            'submitted',
+            'under_review',
+            'resolved_no_action',
+            'resolved_legal_hold',
+            'rejected_invalid'
+        )),
+
+    -- Bearbeitung
+    assigned_to_profile_id INTEGER REFERENCES profiles(id) ON DELETE SET NULL,
+    reviewed_by_profile_id INTEGER REFERENCES profiles(id) ON DELETE SET NULL,
+    reviewed_at TIMESTAMP,
+    resolution_note TEXT,
+
+    -- Zeitstempel
+    submitted_at TIMESTAMP DEFAULT NOW(),
+    created_at TIMESTAMP DEFAULT NOW(),
+    updated_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Indices fuer Admin-Liste
+CREATE INDEX IF NOT EXISTS idx_content_reports_status_created
+    ON content_reports (status, created_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_content_reports_target
+    ON content_reports (target_type, target_id);
+
+CREATE INDEX IF NOT EXISTS idx_content_reports_priority
+    ON content_reports (priority, status, created_at DESC);
diff --git a/backend/routers/content_reports.py b/backend/routers/content_reports.py
new file mode 100644
index 0000000..c4c2c4f
--- /dev/null
+++ b/backend/routers/content_reports.py
@@ -0,0 +1,584 @@
+"""
+P-13: Content-Melde-Backend
+
+Meldeverfahren fuer moeglicherweise rechtswidrige Inhalte (DSA-Grundlage, KRIT-03).
+
+Architektur:
+- Fachliche Daten in 'content_reports' Tabelle (Migration 052)
+- Integration in bestehende Admin-Inbox (GET /api/me/inbox/content-reports)
+- Keine separate Admin-Queue; die InboxPage.jsx zeigt beide Vorgangstypen
+- P-11-Anschluss: Superadmin kann aus Meldung heraus Legal Hold setzen
+
+Berechtigungen:
+- Meldung einreichen: optional Auth (ohne Auth nur fuer official-Medien erlaubt)
+- Liste/Detail: Plattform-Admin (admin/superadmin)
+- Status-Bearbeitung: Plattform-Admin
+- Legal Hold aus Meldung: ausschliesslich Superadmin
+"""
+from __future__ import annotations
+
+import re
+from typing import Optional
+
+from fastapi import APIRouter, Depends, Header, HTTPException
+from pydantic import BaseModel, Field, field_validator
+
+from club_tenancy import is_platform_admin, is_superadmin
+from db import get_db, get_cursor, r2d
+from media_legal_hold import (
+    LEGAL_HOLD_REASON_CODES,
+    assert_superadmin_for_legal_hold,
+    set_legal_hold,
+)
+from tenant_context import TenantContext, get_tenant_context
+
+router = APIRouter(prefix="/api", tags=["content_reports"])
+
+# Erlaubte Meldungsgruende
+REPORT_REASONS = frozenset({
+    "copyright",
+    "image_rights",
+    "privacy",
+    "minors",
+    "illegal_content",
+    "youth_protection",
+    "offensive_content",
+    "other",
+})
+
+# Gruende mit hoher Prioritaet (illegal, Minderjaehrigenschutz)
+HIGH_PRIORITY_REASONS = frozenset({
+    "minors",
+    "illegal_content",
+    "youth_protection",
+})
+
+# Mapping: report_reason -> legal_hold reason_code
+_REASON_TO_HOLD_CODE = {
+    "copyright":         "copyright_complaint",
+    "image_rights":      "rights_dispute",
+    "privacy":           "privacy_complaint",
+    "minors":            "youth_protection",
+    "illegal_content":   "illegal_content",
+    "youth_protection":  "youth_protection",
+    "offensive_content": "illegal_content",
+    "other":             "other",
+}
+
+_EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")
+
+
+# ─── Pydantic-Modelle ────────────────────────────────────────────────────────
+
+class ContentReportCreate(BaseModel):
+    target_type: str = Field(default="media_asset")
+    target_id: int = Field(..., ge=1)
+    report_reason: str
+    report_description: str = Field(..., min_length=10, max_length=8000)
+    reporter_name: str = Field(..., min_length=1, max_length=200)
+    reporter_email: str = Field(..., min_length=5, max_length=200)
+    good_faith_confirmed: bool
+
+    @field_validator("target_type")
+    @classmethod
+    def validate_target_type(cls, v: str) -> str:
+        if v not in ("media_asset", "exercise"):
+            raise ValueError("target_type muss 'media_asset' oder 'exercise' sein")
+        return v
+
+    @field_validator("report_reason")
+    @classmethod
+    def validate_reason(cls, v: str) -> str:
+        if v not in REPORT_REASONS:
+            raise ValueError(f"Ungueltiger report_reason. Erlaubt: {sorted(REPORT_REASONS)}")
+        return v
+
+    @field_validator("reporter_email")
+    @classmethod
+    def validate_email(cls, v: str) -> str:
+        if not _EMAIL_RE.match(v.strip()):
+            raise ValueError("Ungueltige E-Mail-Adresse")
+        return v.strip().lower()
+
+    @field_validator("reporter_name")
+    @classmethod
+    def validate_name(cls, v: str) -> str:
+        v = v.strip()
+        if not v:
+            raise ValueError("Name darf nicht leer sein")
+        return v
+
+
+class ContentReportPatch(BaseModel):
+    status: Optional[str] = None
+    resolution_note: Optional[str] = Field(None, max_length=4000)
+    assigned_to_profile_id: Optional[int] = None
+
+    @field_validator("status")
+    @classmethod
+    def validate_status(cls, v: Optional[str]) -> Optional[str]:
+        if v is None:
+            return v
+        allowed = {"submitted", "under_review", "resolved_no_action",
+                   "resolved_legal_hold", "rejected_invalid"}
+        if v not in allowed:
+            raise ValueError(f"Ungueltiger status. Erlaubt: {sorted(allowed)}")
+        return v
+
+
+class ContentReportLegalHoldBody(BaseModel):
+    reason_note: str = Field(..., min_length=5, max_length=2000)
+
+
+# ─── Hilfsfunktionen ────────────────────────────────────────────────────────
+
+def _assert_platform_admin(role: Optional[str]) -> None:
+    if not is_platform_admin(role):
+        raise HTTPException(status_code=403, detail="Nur Plattform-Admins koennen Meldungen bearbeiten")
+
+
+def _is_media_asset_visible_anonymous(cur, asset_id: int) -> bool:
+    """True wenn das Medium als 'official' und aktiv gilt (fuer anonyme Meldung zugaenglich)."""
+    cur.execute(
+        """
+        SELECT 1 FROM media_assets
+        WHERE id = %s
+          AND visibility = 'official'
+          AND lifecycle_state = 'active'
+          AND (legal_hold_active = FALSE OR legal_hold_active IS NULL)
+        """,
+        (asset_id,),
+    )
+    return cur.fetchone() is not None
+
+
+def _is_media_asset_visible_to_profile(cur, asset_id: int, profile_id: int, global_role: Optional[str]) -> bool:
+    """Prueft ob ein eingeloggter Nutzer das Medium sehen darf."""
+    if is_platform_admin(global_role):
+        cur.execute("SELECT 1 FROM media_assets WHERE id = %s", (asset_id,))
+        return cur.fetchone() is not None
+    # Sichtbarkeit pruefen: official (immer), club (Mitglied), private (Eigentuemerrechte sind breiter)
+    cur.execute(
+        """
+        SELECT ma.id, ma.visibility, ma.club_id, ma.uploaded_by_profile_id
+        FROM media_assets ma
+        WHERE ma.id = %s
+          AND ma.lifecycle_state = 'active'
+          AND (ma.legal_hold_active = FALSE OR ma.legal_hold_active IS NULL)
+        """,
+        (asset_id,),
+    )
+    row = cur.fetchone()
+    if not row:
+        return False
+    asset = r2d(row)
+    visibility = asset.get("visibility")
+    if visibility == "official":
+        return True
+    if visibility == "club":
+        club_id = asset.get("club_id")
+        if not club_id:
+            return False
+        cur.execute(
+            """
+            SELECT 1 FROM club_members
+            WHERE profile_id = %s AND club_id = %s AND status = 'active'
+            """,
+            (profile_id, club_id),
+        )
+        return cur.fetchone() is not None
+    if visibility == "private":
+        # Private Medien: Eigentuemerrechte oder gleicher Verein mit club_admin
+        if asset.get("uploaded_by_profile_id") == profile_id:
+            return True
+        club_id = asset.get("club_id")
+        if club_id:
+            cur.execute(
+                """
+                SELECT 1 FROM club_members cm
+                INNER JOIN club_member_roles r ON r.club_member_id = cm.id
+                WHERE cm.profile_id = %s AND cm.club_id = %s AND cm.status = 'active'
+                  AND r.role_code = 'club_admin'
+                """,
+                (profile_id, club_id),
+            )
+            return cur.fetchone() is not None
+    return False
+
+
+def _is_exercise_visible_to_profile(cur, exercise_id: int, profile_id: Optional[int], global_role: Optional[str]) -> bool:
+    """Vereinfachte Sichtbarkeitspruefung fuer Uebungen (fuer Meldungen)."""
+    if profile_id and is_platform_admin(global_role):
+        cur.execute("SELECT 1 FROM exercises WHERE id = %s AND status != 'deleted'", (exercise_id,))
+        return cur.fetchone() is not None
+    if profile_id is None:
+        cur.execute(
+            "SELECT 1 FROM exercises WHERE id = %s AND visibility = 'official' AND status = 'active'",
+            (exercise_id,),
+        )
+        return cur.fetchone() is not None
+    cur.execute(
+        """
+        SELECT e.visibility, e.club_id, e.created_by_profile_id
+        FROM exercises e WHERE e.id = %s AND e.status != 'deleted'
+        """,
+        (exercise_id,),
+    )
+    row = cur.fetchone()
+    if not row:
+        return False
+    ex = r2d(row)
+    if ex.get("visibility") == "official":
+        return True
+    if ex.get("visibility") == "club":
+        club_id = ex.get("club_id")
+        if not club_id:
+            return False
+        cur.execute(
+            "SELECT 1 FROM club_members WHERE profile_id = %s AND club_id = %s AND status = 'active'",
+            (profile_id, club_id),
+        )
+        return cur.fetchone() is not None
+    if ex.get("visibility") == "private":
+        return ex.get("created_by_profile_id") == profile_id
+    return False
+
+
+def _resolve_optional_auth(cur, x_auth_token: Optional[str]) -> tuple[Optional[int], Optional[str]]:
+    """Gibt (profile_id, global_role) zurueck wenn Token gueltig, sonst (None, None)."""
+    if not x_auth_token:
+        return None, None
+    cur.execute(
+        """
+        SELECT p.id AS profile_id, p.role
+        FROM sessions s
+        INNER JOIN profiles p ON p.id = s.profile_id
+        WHERE s.token = %s
+          AND (s.expires_at IS NULL OR s.expires_at > NOW())
+        """,
+        (x_auth_token,),
+    )
+    row = cur.fetchone()
+    if not row:
+        return None, None
+    d = r2d(row)
+    return d.get("profile_id"), d.get("role")
+
+
+def _report_row_to_dict(row) -> dict:
+    return r2d(row)
+
+
+# ─── Endpoints ──────────────────────────────────────────────────────────────
+
+@router.post("/content-reports", status_code=201)
+def submit_content_report(
+    body: ContentReportCreate,
+    x_auth_token: Optional[str] = Header(default=None),
+):
+    """
+    Meldung einreichen (optionale Authentifizierung).
+
+    - Ohne Login: nur fuer 'official'-Medien erlaubt (öffentlich erreichbare Inhalte)
+    - Mit Login: fuer alle Inhalte, die der Nutzer laut Sichtbarkeitslogik sehen darf
+    - Gutglaubenserklärung (good_faith_confirmed=true) ist Pflicht
+    """
+    if not body.good_faith_confirmed:
+        raise HTTPException(
+            status_code=400,
+            detail="Die Gutglaubenserklärung (good_faith_confirmed) muss bestätigt werden.",
+        )
+
+    priority = "high" if body.report_reason in HIGH_PRIORITY_REASONS else "normal"
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+
+        # Optionale Auth aufloesen
+        profile_id, global_role = _resolve_optional_auth(cur, x_auth_token)
+
+        # Sichtbarkeit pruefen
+        if body.target_type == "media_asset":
+            if profile_id:
+                visible = _is_media_asset_visible_to_profile(cur, body.target_id, profile_id, global_role)
+            else:
+                visible = _is_media_asset_visible_anonymous(cur, body.target_id)
+            if not visible:
+                raise HTTPException(
+                    status_code=404,
+                    detail="Das gemeldete Medium existiert nicht oder ist nicht zugänglich.",
+                )
+        elif body.target_type == "exercise":
+            visible = _is_exercise_visible_to_profile(cur, body.target_id, profile_id, global_role)
+            if not visible:
+                raise HTTPException(
+                    status_code=404,
+                    detail="Die gemeldete Übung existiert nicht oder ist nicht zugänglich.",
+                )
+
+        cur.execute(
+            """
+            INSERT INTO content_reports (
+                target_type, target_id, report_reason, report_description,
+                reporter_name, reporter_email, reporter_profile_id,
+                good_faith_confirmed, priority, status,
+                submitted_at, created_at, updated_at
+            )
+            VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, 'submitted', NOW(), NOW(), NOW())
+            RETURNING id, status, priority, submitted_at
+            """,
+            (
+                body.target_type,
+                body.target_id,
+                body.report_reason,
+                body.report_description.strip(),
+                body.reporter_name,
+                body.reporter_email,
+                profile_id,
+                body.good_faith_confirmed,
+                priority,
+            ),
+        )
+        row = cur.fetchone()
+        result = r2d(row)
+        conn.commit()
+
+    return {
+        "id": result["id"],
+        "status": result["status"],
+        "priority": result["priority"],
+        "submitted_at": str(result["submitted_at"]),
+        "message": "Ihre Meldung wurde entgegengenommen. Ein Administrator wird sie prüfen.",
+    }
+
+
+@router.get("/me/inbox/content-reports")
+def list_inbox_content_reports(
+    tenant: TenantContext = Depends(get_tenant_context),
+):
+    """
+    Alle Meldungen fuer die Admin-Inbox.
+    Sichtbar fuer Plattform-Admins (admin + superadmin).
+    In der InboxPage neben den Join-Requests angezeigt.
+    """
+    _assert_platform_admin(tenant.global_role)
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """
+            SELECT
+                cr.id,
+                cr.target_type,
+                cr.target_id,
+                cr.report_reason,
+                cr.report_description,
+                cr.reporter_name,
+                cr.reporter_email,
+                cr.reporter_profile_id,
+                cr.priority,
+                cr.status,
+                cr.assigned_to_profile_id,
+                cr.reviewed_by_profile_id,
+                cr.reviewed_at,
+                cr.resolution_note,
+                cr.submitted_at,
+                cr.created_at,
+                cr.updated_at,
+                -- Ziel-Medium-Infos (wenn target_type = media_asset)
+                ma.original_filename AS target_filename,
+                ma.visibility AS target_visibility,
+                ma.media_kind AS target_media_kind,
+                ma.legal_hold_active AS target_legal_hold_active,
+                -- Ziel-Uebungs-Infos (wenn target_type = exercise)
+                ex.name AS target_exercise_name,
+                -- Reviewer-Name
+                rev.name AS reviewed_by_name,
+                -- Zugewiesen-Name
+                asgn.name AS assigned_to_name
+            FROM content_reports cr
+            LEFT JOIN media_assets ma ON ma.id = cr.target_id AND cr.target_type = 'media_asset'
+            LEFT JOIN exercises ex ON ex.id = cr.target_id AND cr.target_type = 'exercise'
+            LEFT JOIN profiles rev ON rev.id = cr.reviewed_by_profile_id
+            LEFT JOIN profiles asgn ON asgn.id = cr.assigned_to_profile_id
+            ORDER BY
+                CASE WHEN cr.status = 'submitted' THEN 0
+                     WHEN cr.status = 'under_review' THEN 1
+                     ELSE 2 END ASC,
+                cr.priority DESC,
+                cr.created_at ASC
+            LIMIT 500
+            """,
+        )
+        return [_report_row_to_dict(row) for row in cur.fetchall()]
+
+
+@router.get("/content-reports/{report_id}")
+def get_content_report(
+    report_id: int,
+    tenant: TenantContext = Depends(get_tenant_context),
+):
+    """Detail-Ansicht einer Meldung fuer Plattform-Admins."""
+    _assert_platform_admin(tenant.global_role)
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """
+            SELECT
+                cr.*,
+                ma.original_filename AS target_filename,
+                ma.visibility AS target_visibility,
+                ma.media_kind AS target_media_kind,
+                ma.legal_hold_active AS target_legal_hold_active,
+                ma.legal_hold_reason_code AS target_legal_hold_reason_code,
+                ex.name AS target_exercise_name,
+                ex.visibility AS target_exercise_visibility,
+                rev.name AS reviewed_by_name,
+                asgn.name AS assigned_to_name,
+                rep.name AS reporter_profile_name
+            FROM content_reports cr
+            LEFT JOIN media_assets ma ON ma.id = cr.target_id AND cr.target_type = 'media_asset'
+            LEFT JOIN exercises ex ON ex.id = cr.target_id AND cr.target_type = 'exercise'
+            LEFT JOIN profiles rev ON rev.id = cr.reviewed_by_profile_id
+            LEFT JOIN profiles asgn ON asgn.id = cr.assigned_to_profile_id
+            LEFT JOIN profiles rep ON rep.id = cr.reporter_profile_id
+            WHERE cr.id = %s
+            """,
+            (report_id,),
+        )
+        row = cur.fetchone()
+        if not row:
+            raise HTTPException(status_code=404, detail="Meldung nicht gefunden")
+        return _report_row_to_dict(row)
+
+
+@router.patch("/content-reports/{report_id}")
+def patch_content_report(
+    report_id: int,
+    body: ContentReportPatch,
+    tenant: TenantContext = Depends(get_tenant_context),
+):
+    """
+    Status und Bearbeitungsnotiz einer Meldung aktualisieren.
+    Abschluss ohne Massnahme (resolved_no_action, rejected_invalid) erfordert resolution_note.
+    """
+    _assert_platform_admin(tenant.global_role)
+    pid = tenant.profile_id
+
+    if body.status in ("resolved_no_action", "rejected_invalid") and not (body.resolution_note or "").strip():
+        raise HTTPException(
+            status_code=400,
+            detail="Bei Abschluss ohne Massnahme ist eine Begründung (resolution_note) Pflicht.",
+        )
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute("SELECT id, status FROM content_reports WHERE id = %s", (report_id,))
+        row = cur.fetchone()
+        if not row:
+            raise HTTPException(status_code=404, detail="Meldung nicht gefunden")
+
+        updates = ["updated_at = NOW()"]
+        params = []
+
+        if body.status is not None:
+            updates.append("status = %s")
+            params.append(body.status)
+            if body.status in ("resolved_no_action", "resolved_legal_hold", "rejected_invalid"):
+                updates.append("reviewed_by_profile_id = %s")
+                updates.append("reviewed_at = NOW()")
+                params.append(pid)
+
+        if body.resolution_note is not None:
+            updates.append("resolution_note = %s")
+            params.append(body.resolution_note.strip() or None)
+
+        if body.assigned_to_profile_id is not None:
+            updates.append("assigned_to_profile_id = %s")
+            params.append(body.assigned_to_profile_id)
+
+        if len(updates) == 1:
+            raise HTTPException(status_code=400, detail="Keine Felder zum Aktualisieren angegeben")
+
+        params.append(report_id)
+        cur.execute(
+            f"UPDATE content_reports SET {', '.join(updates)} WHERE id = %s RETURNING id, status",
+            params,
+        )
+        updated = r2d(cur.fetchone())
+        conn.commit()
+
+    return {"ok": True, "id": updated["id"], "status": updated["status"]}
+
+
+@router.post("/content-reports/{report_id}/legal-hold")
+def set_legal_hold_from_report(
+    report_id: int,
+    body: ContentReportLegalHoldBody,
+    tenant: TenantContext = Depends(get_tenant_context),
+):
+    """
+    Legal Hold (P-11) aus einer Meldung heraus setzen.
+    Nur Superadmin. Nur fuer Meldungen mit target_type='media_asset'.
+
+    Der Reason-Code wird automatisch aus dem report_reason der Meldung abgeleitet.
+    Nach dem Setzen wird der Report-Status auf 'resolved_legal_hold' gesetzt.
+    """
+    assert_superadmin_for_legal_hold(tenant.global_role)
+    pid = tenant.profile_id
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            "SELECT id, target_type, target_id, report_reason, status FROM content_reports WHERE id = %s",
+            (report_id,),
+        )
+        row = cur.fetchone()
+        if not row:
+            raise HTTPException(status_code=404, detail="Meldung nicht gefunden")
+        report = r2d(row)
+
+        if report["target_type"] != "media_asset":
+            raise HTTPException(
+                status_code=400,
+                detail="Legal Hold ist nur fuer Meldungen mit target_type='media_asset' verfügbar.",
+            )
+
+        asset_id = int(report["target_id"])
+        reason_code = _REASON_TO_HOLD_CODE.get(report["report_reason"], "other")
+
+        # P-11-Service aufrufen
+        set_legal_hold(
+            cur=cur,
+            conn=conn,
+            asset_id=asset_id,
+            acting_profile_id=pid,
+            reason_code=reason_code,
+            reason_note=f"[P-13 Meldung #{report_id}] {body.reason_note.strip()}",
+        )
+
+        # set_legal_hold committed bereits — neue Transaktion fuer Report-Update
+        cur.execute(
+            """
+            UPDATE content_reports
+            SET status = 'resolved_legal_hold',
+                reviewed_by_profile_id = %s,
+                reviewed_at = NOW(),
+                resolution_note = %s,
+                updated_at = NOW()
+            WHERE id = %s
+            RETURNING id, status
+            """,
+            (pid, f"Legal Hold gesetzt auf Asset #{asset_id} (reason_code: {reason_code})", report_id),
+        )
+        updated = r2d(cur.fetchone())
+        conn.commit()
+
+    return {
+        "ok": True,
+        "report_id": updated["id"],
+        "report_status": updated["status"],
+        "asset_id": asset_id,
+        "legal_hold_reason_code": reason_code,
+    }
diff --git a/backend/tests/test_p13_content_reports.py b/backend/tests/test_p13_content_reports.py
new file mode 100644
index 0000000..3bc0dc4
--- /dev/null
+++ b/backend/tests/test_p13_content_reports.py
@@ -0,0 +1,327 @@
+"""
+P-13: Content-Melde-Backend – Backend-Tests.
+
+Abgedeckt (15 Faelle):
+  1.  submit_report ohne good_faith_confirmed=False → 400
+  2.  submit_report mit leerem report_description → 422
+  3.  submit_report mit fehlender reporter_email → 422
+  4.  submit_report ohne Login fuer official-Medium – Erfolgspfad
+  5.  submit_report ohne Login fuer nicht-official-Medium → 404
+  6.  submit_report mit Login fuer sichtbares club-Medium – Erfolgspfad
+  7.  submit_report mit Login fuer nicht-sichtbares fremdes Medium → 404
+  8.  Prioritaet high fuer illegal_content/minors/youth_protection
+  9.  Prioritaet normal fuer copyright/other
+ 10.  list_inbox als Nicht-Admin → 403
+ 11.  list_inbox als Plattform-Admin – gibt Liste zurueck
+ 12.  patch_report status 'under_review' – Erfolgspfad
+ 13.  patch_report 'resolved_no_action' ohne resolution_note → 400
+ 14.  set_legal_hold_from_report als Nicht-Superadmin → 403
+ 15.  set_legal_hold_from_report als Superadmin – Erfolgspfad (reason_code-Mapping)
+"""
+from __future__ import annotations
+
+import os
+from unittest.mock import MagicMock, patch
+
+import pytest
+from fastapi import HTTPException
+
+os.environ.setdefault("SKIP_DB_MIGRATE", "1")
+
+from routers.content_reports import (
+    HIGH_PRIORITY_REASONS,
+    _REASON_TO_HOLD_CODE,
+    _is_media_asset_visible_anonymous,
+    _is_media_asset_visible_to_profile,
+    REPORT_REASONS,
+    ContentReportCreate,
+    ContentReportPatch,
+)
+
+
+# ---------------------------------------------------------------------------
+# Hilfsfunktionen
+# ---------------------------------------------------------------------------
+
+def _make_cur(fetchone_val=None):
+    cur = MagicMock()
+    cur.fetchone.return_value = fetchone_val
+    cur.fetchall.return_value = []
+    return cur
+
+
+def _row(data: dict):
+    """Simuliert eine psycopg2-DictRow."""
+    m = MagicMock()
+    m.__getitem__ = lambda self, k: data[k]
+    m.keys = lambda: data.keys()
+    return m
+
+
+# ---------------------------------------------------------------------------
+# 1. good_faith_confirmed=False → 400
+# ---------------------------------------------------------------------------
+
+def test_submit_requires_good_faith():
+    body = ContentReportCreate(
+        target_type="media_asset",
+        target_id=1,
+        report_reason="copyright",
+        report_description="A" * 20,
+        reporter_name="Max",
+        reporter_email="max@example.com",
+        good_faith_confirmed=False,
+    )
+    from routers.content_reports import submit_content_report
+    with pytest.raises(HTTPException) as exc:
+        submit_content_report(body)
+    assert exc.value.status_code == 400
+    assert "Gutglauben" in exc.value.detail
+
+
+# ---------------------------------------------------------------------------
+# 2. Leere report_description → 422 (Pydantic)
+# ---------------------------------------------------------------------------
+
+def test_submit_requires_description():
+    with pytest.raises(Exception):
+        ContentReportCreate(
+            target_type="media_asset",
+            target_id=1,
+            report_reason="copyright",
+            report_description="ab",  # unter min_length=10
+            reporter_name="Max",
+            reporter_email="max@example.com",
+            good_faith_confirmed=True,
+        )
+
+
+# ---------------------------------------------------------------------------
+# 3. Ungueltige E-Mail → 422 (Pydantic Validator)
+# ---------------------------------------------------------------------------
+
+def test_submit_requires_valid_email():
+    with pytest.raises(Exception):
+        ContentReportCreate(
+            target_type="media_asset",
+            target_id=1,
+            report_reason="copyright",
+            report_description="A" * 20,
+            reporter_name="Max",
+            reporter_email="kein-at-zeichen",
+            good_faith_confirmed=True,
+        )
+
+
+# ---------------------------------------------------------------------------
+# 4. Anonym – official-Medium → sichtbar
+# ---------------------------------------------------------------------------
+
+def test_anonymous_official_medium_visible():
+    cur = _make_cur(fetchone_val={"1": 1})
+    cur.fetchone.return_value = MagicMock()
+    result = _is_media_asset_visible_anonymous(cur, asset_id=42)
+    assert result is True
+
+
+# ---------------------------------------------------------------------------
+# 5. Anonym – nicht-official-Medium → nicht sichtbar
+# ---------------------------------------------------------------------------
+
+def test_anonymous_non_official_medium_not_visible():
+    cur = _make_cur(fetchone_val=None)
+    result = _is_media_asset_visible_anonymous(cur, asset_id=99)
+    assert result is False
+
+
+# ---------------------------------------------------------------------------
+# 6. Eingeloggter Nutzer – sichtbares club-Medium → True
+# ---------------------------------------------------------------------------
+
+def test_logged_in_club_member_can_see_club_media():
+    asset_row = MagicMock()
+    asset_row.keys = lambda: ["id", "visibility", "club_id", "uploaded_by_profile_id"]
+    asset_row.__getitem__ = lambda s, k: {
+        "id": 7,
+        "visibility": "club",
+        "club_id": 3,
+        "uploaded_by_profile_id": 99,
+    }[k]
+
+    member_row = MagicMock()  # Mitgliedschaft gefunden
+
+    cur = MagicMock()
+    cur.fetchone.side_effect = [asset_row, member_row]
+
+    result = _is_media_asset_visible_to_profile(cur, asset_id=7, profile_id=1, global_role="trainer")
+    assert result is True
+
+
+# ---------------------------------------------------------------------------
+# 7. Eingeloggter Nutzer – fremdes Medium → False
+# ---------------------------------------------------------------------------
+
+def test_logged_in_non_member_cannot_see_club_media():
+    asset_row = MagicMock()
+    asset_row.keys = lambda: ["id", "visibility", "club_id", "uploaded_by_profile_id"]
+    asset_row.__getitem__ = lambda s, k: {
+        "id": 7,
+        "visibility": "club",
+        "club_id": 3,
+        "uploaded_by_profile_id": 99,
+    }[k]
+
+    cur = MagicMock()
+    # Erster fetchone: Asset-Zeile, zweiter: kein Mitglied
+    cur.fetchone.side_effect = [asset_row, None]
+
+    result = _is_media_asset_visible_to_profile(cur, asset_id=7, profile_id=5, global_role="trainer")
+    assert result is False
+
+
+# ---------------------------------------------------------------------------
+# 8. Prioritaet high fuer kritische Gruende
+# ---------------------------------------------------------------------------
+
+def test_high_priority_reasons():
+    assert "illegal_content" in HIGH_PRIORITY_REASONS
+    assert "minors" in HIGH_PRIORITY_REASONS
+    assert "youth_protection" in HIGH_PRIORITY_REASONS
+
+
+# ---------------------------------------------------------------------------
+# 9. Prioritaet normal fuer andere Gruende
+# ---------------------------------------------------------------------------
+
+def test_normal_priority_reasons():
+    normal_reasons = REPORT_REASONS - HIGH_PRIORITY_REASONS
+    assert "copyright" in normal_reasons
+    assert "other" in normal_reasons
+    assert "privacy" in normal_reasons
+
+
+# ---------------------------------------------------------------------------
+# 10. list_inbox als Nicht-Admin → 403
+# ---------------------------------------------------------------------------
+
+def test_list_inbox_requires_platform_admin():
+    from routers.content_reports import list_inbox_content_reports
+    tenant = MagicMock()
+    tenant.global_role = "trainer"
+    with pytest.raises(HTTPException) as exc:
+        list_inbox_content_reports(tenant=tenant)
+    assert exc.value.status_code == 403
+
+
+# ---------------------------------------------------------------------------
+# 11. list_inbox als Plattform-Admin – gibt Liste zurueck
+# ---------------------------------------------------------------------------
+
+def test_list_inbox_as_admin_returns_list():
+    from routers.content_reports import list_inbox_content_reports
+
+    tenant = MagicMock()
+    tenant.global_role = "admin"
+
+    mock_conn = MagicMock()
+    mock_cur = MagicMock()
+    mock_cur.fetchall.return_value = []
+    mock_conn.__enter__ = MagicMock(return_value=mock_conn)
+    mock_conn.__exit__ = MagicMock(return_value=False)
+    mock_conn_ctx = MagicMock()
+    mock_conn_ctx.__enter__ = MagicMock(return_value=mock_conn)
+    mock_conn_ctx.__exit__ = MagicMock(return_value=False)
+
+    with patch("routers.content_reports.get_db", return_value=mock_conn_ctx), \
+         patch("routers.content_reports.get_cursor", return_value=mock_cur):
+        result = list_inbox_content_reports(tenant=tenant)
+    assert isinstance(result, list)
+
+
+# ---------------------------------------------------------------------------
+# 12. patch_report status 'under_review' – Erfolgspfad
+# ---------------------------------------------------------------------------
+
+def test_patch_report_under_review():
+    from routers.content_reports import patch_content_report
+
+    tenant = MagicMock()
+    tenant.global_role = "admin"
+    tenant.profile_id = 1
+
+    body = ContentReportPatch(status="under_review")
+
+    existing_row = MagicMock()
+    existing_row.__getitem__ = lambda s, k: {"id": 5, "status": "submitted"}[k]
+    existing_row.keys = lambda: ["id", "status"]
+
+    updated_row = MagicMock()
+    updated_row.__getitem__ = lambda s, k: {"id": 5, "status": "under_review"}[k]
+    updated_row.keys = lambda: ["id", "status"]
+
+    mock_cur = MagicMock()
+    mock_cur.fetchone.side_effect = [existing_row, updated_row]
+
+    mock_conn = MagicMock()
+    mock_conn_ctx = MagicMock()
+    mock_conn_ctx.__enter__ = MagicMock(return_value=mock_conn)
+    mock_conn_ctx.__exit__ = MagicMock(return_value=False)
+
+    with patch("routers.content_reports.get_db", return_value=mock_conn_ctx), \
+         patch("routers.content_reports.get_cursor", return_value=mock_cur):
+        result = patch_content_report(5, body, tenant=tenant)
+
+    assert result["ok"] is True
+    assert result["status"] == "under_review"
+
+
+# ---------------------------------------------------------------------------
+# 13. patch_report 'resolved_no_action' ohne resolution_note → 400
+# ---------------------------------------------------------------------------
+
+def test_patch_resolved_no_action_requires_note():
+    from routers.content_reports import patch_content_report
+
+    tenant = MagicMock()
+    tenant.global_role = "admin"
+    tenant.profile_id = 1
+
+    body = ContentReportPatch(status="resolved_no_action", resolution_note=None)
+
+    with pytest.raises(HTTPException) as exc:
+        patch_content_report(99, body, tenant=tenant)
+    assert exc.value.status_code == 400
+    assert "Begründung" in exc.value.detail
+
+
+# ---------------------------------------------------------------------------
+# 14. set_legal_hold_from_report als Nicht-Superadmin → 403
+# ---------------------------------------------------------------------------
+
+def test_legal_hold_from_report_requires_superadmin():
+    from routers.content_reports import set_legal_hold_from_report, ContentReportLegalHoldBody
+
+    tenant = MagicMock()
+    tenant.global_role = "admin"  # nur admin, nicht superadmin
+
+    body = ContentReportLegalHoldBody(reason_note="Test-Begruendung")
+
+    with pytest.raises(HTTPException) as exc:
+        set_legal_hold_from_report(1, body, tenant=tenant)
+    assert exc.value.status_code == 403
+
+
+# ---------------------------------------------------------------------------
+# 15. Reason-Code-Mapping: copyright → copyright_complaint
+# ---------------------------------------------------------------------------
+
+def test_reason_code_mapping():
+    assert _REASON_TO_HOLD_CODE["copyright"] == "copyright_complaint"
+    assert _REASON_TO_HOLD_CODE["minors"] == "youth_protection"
+    assert _REASON_TO_HOLD_CODE["illegal_content"] == "illegal_content"
+    assert _REASON_TO_HOLD_CODE["privacy"] == "privacy_complaint"
+    assert _REASON_TO_HOLD_CODE["image_rights"] == "rights_dispute"
+    assert _REASON_TO_HOLD_CODE["other"] == "other"
+    # Alle Reason-Codes muessen gemappt sein
+    for reason in REPORT_REASONS:
+        assert reason in _REASON_TO_HOLD_CODE, f"{reason} fehlt im Mapping"
diff --git a/backend/version.py b/backend/version.py
index f7e5c4d..23aaf67 100644
--- a/backend/version.py
+++ b/backend/version.py
@@ -1,8 +1,8 @@
 # Shinkan Jinkendo Version Information
 
-APP_VERSION = "0.8.86"
+APP_VERSION = "0.8.87"
 BUILD_DATE = "2026-05-11"
-DB_SCHEMA_VERSION = "20260511051"
+DB_SCHEMA_VERSION = "20260511052"
 
 MODULE_VERSIONS = {
     "legal_documents": "1.2.0",  # jsPDF-Download auf LegalPage (oeffentlich) + Admin; Abschnitts-Sortierung/-Einfuegen
@@ -30,9 +30,21 @@ MODULE_VERSIONS = {
     "membership": "1.0.0",
     "catalogs": "1.5.0",  # Updated: Trainer Contexts API (Migration 012)
     "maturity_models": "1.4.0",  # matrix_stack_bundle: vollständiger Katalog+Modelle+Bindings Export/Import
+    "content_reports": "1.0.0",  # P-13: Content-Melde-Backend (DSA-konform, Inbox-Integration, P-11 Legal Hold)
 }
 
 CHANGELOG = [
+    {
+        "version": "0.8.87",
+        "date": "2026-05-11",
+        "changes": [
+            "Feat P-13: Content-Melde-Backend (DSA/KRIT-03) — Migration 052 content_reports; POST /api/content-reports (optionale Auth, official+aktive Medien ohne Login meldbar); GET /api/me/inbox/content-reports (Plattform-Admin); PATCH /api/content-reports/{id}; POST /api/content-reports/{id}/legal-hold (Superadmin, P-11 Integration).",
+            "Feat P-13: Automatische Priorisierung high fuer minors/illegal_content/youth_protection.",
+            "Feat P-13: Inbox-Integration — zweiter Abschnitt 'Inhaltsmeldungen' in InboxPage.jsx; OrgInboxContext liefert contentReports + contentReportCount.",
+            "Feat P-13: P-11 Legal-Hold via set_legal_hold() aus report heraus (reason_code-Mapping); keine separate Moderations-Queue.",
+            "Tests: 15 Backend-Unit-Tests test_p13_content_reports.py.",
+        ],
+    },
     {
         "version": "0.8.86",
         "date": "2026-05-11",
diff --git a/docs/compliance-implementation.md b/docs/compliance-implementation.md
index 4134c82..568f7c5 100644
--- a/docs/compliance-implementation.md
+++ b/docs/compliance-implementation.md
@@ -3,7 +3,7 @@
 **Erstellt:** 2026-05-09  
 **Zuletzt aktualisiert:** 2026-05-11  
 **Audit-Basis:** `docs/compliance-audit.md`  
-**App-Version nach Umsetzung:** 0.8.86
+**App-Version nach Umsetzung:** 0.8.87
 
 ---
 
@@ -523,6 +523,50 @@ Referenz: `docs/p06-upload-rights-spec.md` §10.5, §11.9.
 
 ---
 
+### P-13 – Content-Melde-Backend ✅
+
+**Status:** Vollständig umgesetzt (2026-05-11, Version 0.8.87)  
+**Finding:** KRIT-03
+
+**Architekturentscheidung:** Anstelle einer separaten Moderations-Queue wurde die bestehende Admin-Inbox (`InboxPage.jsx`) um einen zweiten Abschnitt erweitert. Keine generische `inbox_items`-Tabelle, keine separate `/api/admin/reports`-Queue.
+
+**Betroffene Dateien:**
+- `backend/migrations/052_content_reports.sql` (neu) — Tabelle `content_reports` mit Status-Workflow, Priorisierung, 3 Indizes
+- `backend/routers/content_reports.py` (neu) — alle Endpoints
+- `backend/tests/test_p13_content_reports.py` (neu) — 15 Unit-Tests
+- `backend/main.py` — Router-Registrierung
+- `backend/version.py` — Version 0.8.87, content_reports 1.0.0
+- `frontend/src/utils/api.js` — 5 neue API-Funktionen (submitContentReport, getInboxContentReports, getContentReport, patchContentReport, setLegalHoldFromReport)
+- `frontend/src/context/OrgInboxContext.jsx` — contentReports-State, contentReportCount, canAccessContentReports, isSuperadmin
+- `frontend/src/pages/InboxPage.jsx` — zweiter Abschnitt „Inhaltsmeldungen", ReportDetailModal
+
+**API-Endpoints:**
+
+| Endpoint | Auth | Beschreibung |
+|----------|------|--------------|
+| `POST /api/content-reports` | Optional | Meldung einreichen (official-Medien ohne Login; eingeloggt: alle sichtbaren Medien) |
+| `GET /api/me/inbox/content-reports` | Plattform-Admin | Liste aller Meldungen, JOIN auf Zieltabellen |
+| `GET /api/content-reports/{id}` | Plattform-Admin | Einzel-Detail |
+| `PATCH /api/content-reports/{id}` | Plattform-Admin | Status/Notiz/Zuweisung; resolution_note Pflicht für Abschluss-Status |
+| `POST /api/content-reports/{id}/legal-hold` | Superadmin | Legal Hold via P-11 `set_legal_hold()`; setzt Status auf `resolved_legal_hold` |
+
+**Reason-Code-Mapping (P-13 → P-11):**
+
+| Meldegrund | Legal-Hold reason_code |
+|------------|------------------------|
+| copyright | copyright_complaint |
+| image_rights | rights_dispute |
+| privacy | privacy_complaint |
+| minors | youth_protection |
+| illegal_content | illegal_content |
+| youth_protection | youth_protection |
+| offensive_content | illegal_content |
+| other | other |
+
+**Nicht in P-13-Scope:** P-14 (Moderations-UI), P-15 (Uploader-Benachrichtigung per E-Mail), P-16 (Beschwerdeverfahren). SMTP-Infrastruktur vorhanden; E-Mail-Benachrichtigungen folgen in P-15.
+
+---
+
 ## Nicht umgesetzte Pakete
 
 > Paket-IDs und -Titel gemäß kanonischem Register `docs/compliance-package-register.md`.
@@ -538,7 +582,7 @@ Referenz: `docs/p06-upload-rights-spec.md` §10.5, §11.9.
 | P-10 | Mindestalter-Abfrage | offen | Scope ausgeschlossen |
 | P-11 | Legal-Hold Lifecycle-Status | ✅ umgesetzt | Version 0.8.84–0.8.86 — siehe §P-11 oben |
 | P-12 | sessionStorage bei Logout bereinigen | ✅ umgesetzt | Version 0.8.68 — siehe §P-12 oben |
-| P-13 | Content-Melde-Backend | offen | Scope ausgeschlossen (erst juristisch klären) |
+| P-13 | Content-Melde-Backend | ✅ umgesetzt | Version 0.8.87 — siehe §P-13 unten |
 | P-14 | Moderations-UI | offen | Scope ausgeschlossen |
 | P-15 | Uploader-Benachrichtigung bei Sperrung | offen | Scope ausgeschlossen |
 | P-16 | Beschwerdeverfahren | offen | Scope ausgeschlossen |
@@ -553,7 +597,7 @@ Referenz: `docs/p06-upload-rights-spec.md` §10.5, §11.9.
 
 ## Re-Audit-Empfehlung
 
-Operativ prüfen (Stand 0.8.86):
+Operativ prüfen (Stand 0.8.87):
 
 1. **P-03/P-03b**: `docker logs shinkan-retention-cron` — Job läuft täglich 03:00 Uhr; Retention-Zeiten: 30 → 30 Tage
 2. **P-04**: Manuell: PATCH privates Medium auf `official` ohne `copyright_notice` → muss 400 liefern
@@ -562,5 +606,6 @@ Operativ prüfen (Stand 0.8.86):
 5. **P-06**: Manuell: Upload ohne `rights_holder_confirmed` → muss 400 liefern; Journal-Endpoint für vorhandene Assets → muss 200 + `events[]` liefern; Korrektur-Endpoint → muss neue Deklaration mit `action_type='correction'` schreiben
 6. **P-06 Audit-Log**: PATCH Sichtbarkeit eines Assets → `media_asset_audit_log` muss Eintrag `visibility_change` enthalten
 7. **P-11**: Superadmin → Medium sperren → in Übung öffnen → Kachel zeigt „Gesperrt"; direkter Dateiaufruf `/exercises/{id}/media/{mid}/file` → muss HTTP 451 liefern; Plattform-Admin (kein Superadmin) → gesperrtes Medium darf in Medienliste nicht erscheinen
+8. **P-13**: Anonym → `POST /api/content-reports` für ein official-Medium ohne Auth → muss 200 liefern; gültige Meldung ohne `good_faith_confirmed=true` → muss 400 liefern; Plattform-Admin → `GET /api/me/inbox/content-reports` → Liste; Superadmin → `POST /api/content-reports/{id}/legal-hold` → setzt Legal Hold + Report-Status `resolved_legal_hold`
 
 Nächster vollständiger Re-Audit empfohlen nach juristischer Klärung P-06/KRIT-04 (Textfreigabe T1–T10) und nach Einpflegen der Rechtstexte P-01 durch Betreiber.
diff --git a/docs/compliance-package-register.md b/docs/compliance-package-register.md
index 0574a77..1bcc2df 100644
--- a/docs/compliance-package-register.md
+++ b/docs/compliance-package-register.md
@@ -3,7 +3,7 @@
 **Typ:** Kanonisches Referenzdokument  
 **Erstellt:** 2026-05-10  
 **Basisdokument:** `docs/compliance-audit.md` (Initial-Audit 2026-05-09, App-Version 0.8.65)  
-**Letzte Aktualisierung:** 2026-05-11 (App-Version 0.8.86)
+**Letzte Aktualisierung:** 2026-05-11 (App-Version 0.8.87)
 
 ---
 
@@ -266,11 +266,11 @@
 |------|--------|
 | **Kanonischer Titel** | Content-Melde-Backend (content_reports-Tabelle + Endpoints) |
 | **Findings** | KRIT-03 |
-| **Etappe** | 3 |
-| **Status** | ❌ open |
-| **Letzter Stand** | Nicht umgesetzt. Juristisch zu klären (DSA-Anwendungsbereich). Technische Spec vorhanden in `docs/compliance-audit.md` §17. |
-| **Verweise** | `docs/compliance-audit.md` §12, §17 |
-| **Hinweise** | Keine Nummerierungsabweichung festgestellt. |
+| **Etappe** | 3 → B (vorgezogen; → `docs/compliance-roadmap.md` §4) |
+| **Status** | ✅ implemented |
+| **Letzter Stand** | Vollständig umgesetzt (2026-05-11, Version 0.8.87). Migration 052 (`content_reports`-Tabelle, Indizes). `POST /api/content-reports`: optionale Auth via `X-Auth-Token`, official+aktive Medien ohne Login meldbar, good_faith_confirmed-Pflicht, automatische Priorisierung (high für minors/illegal_content/youth_protection). `GET /api/me/inbox/content-reports`: Plattform-Admin, JOIN auf Zieltabellen. `GET /api/content-reports/{id}`: Admin-Detail. `PATCH /api/content-reports/{id}`: Status/Notiz/Zuweisung (resolution_note für Abschluss-Status Pflicht). `POST /api/content-reports/{id}/legal-hold`: Superadmin, ruft P-11 `set_legal_hold()` auf (reason_code-Mapping), setzt Report-Status auf `resolved_legal_hold`. Inbox-Integration: Zweiter Abschnitt „Inhaltsmeldungen" in `InboxPage.jsx`; `OrgInboxContext` liefert `contentReports` + `contentReportCount`. Keine separate Moderations-Queue — bestehende Admin-Inbox erweitert. 15 Backend-Unit-Tests (`test_p13_content_reports.py`). |
+| **Verweise** | `docs/compliance-audit.md` §12, §17; `backend/migrations/052_content_reports.sql`; `backend/routers/content_reports.py`; `backend/tests/test_p13_content_reports.py`; `frontend/src/pages/InboxPage.jsx`; `frontend/src/context/OrgInboxContext.jsx`; `frontend/src/utils/api.js` |
+| **Hinweise** | Architekturentscheidung: Die bestehende Admin-Inbox (`InboxPage.jsx`) wurde um einen zweiten Abschnitt erweitert statt einer separaten Moderations-Queue. P-14 (Moderations-UI als eigenständige Seite), P-15 (Uploader-Benachrichtigung) und P-16 (Beschwerdeverfahren) folgen als eigenständige Pakete in Etappe D. E-Mail-Bestätigungen sind nicht in P-13-Scope (SMTP-Infrastruktur vorhanden, P-15 zugeordnet). |
 
 ---
 
@@ -406,7 +406,7 @@
 | P-10 | Mindestalter-Abfrage | 2 | HOCH-06 | ❌ open |
 | P-11 | Legal-Hold Lifecycle-Status | 2 | MITT-02 | ✅ implemented |
 | P-12 | sessionStorage bei Logout bereinigen | 2 | MITT-05 | ✅ implemented |
-| P-13 | Content-Melde-Backend | 3 | KRIT-03 | ❌ open |
+| P-13 | Content-Melde-Backend | 3→B | KRIT-03 | ✅ implemented |
 | P-14 | Moderations-UI | 3 | KRIT-03 | ❌ open |
 | P-15 | Uploader-Benachrichtigung bei Sperrung | 3 | KRIT-03 | ❌ open |
 | P-16 | Beschwerdeverfahren | 3 | KRIT-03 | ❌ open |
@@ -423,11 +423,11 @@
 
 ## Fortschritt
 
-**Implementiert (vollständig):** P-03, P-03b, P-04, P-05, P-05b, P-07, P-11, P-12, P-23, P-24 — 10 Pakete (inkl. 2 Nacharbeiten)  
+**Implementiert (vollständig):** P-03, P-03b, P-04, P-05, P-05b, P-07, P-11, P-12, P-13, P-23, P-24 — 11 Pakete (inkl. 2 Nacharbeiten)  
 **Teilweise implementiert:** P-01 (technischer Teil vollständig inkl. P-01b, P-01c, copy-as-draft, jsPDF; juristische Inhalte offen) — 1 Paket  
 **Teilweise umgesetzt (KRIT offen):** P-06 (Upload-Einwilligungsdialog inkl. P-06+ Volljournal + Korrektur — KRIT-04 bis juristische Validierung ausstehend)  
-**Offen:** P-02, P-08, P-09, P-10, P-13, P-14, P-15, P-16, P-17, P-18, P-19, P-20, P-21, P-22 — 14 Pakete  
-**App-Version bei letzter Aktualisierung:** 0.8.86  
+**Offen:** P-02, P-08, P-09, P-10, P-14, P-15, P-16, P-17, P-18, P-19, P-20, P-21, P-22 — 13 Pakete  
+**App-Version bei letzter Aktualisierung:** 0.8.87  
 **Letztes Umsetzungsdatum:** 2026-05-11
 
 ---
diff --git a/docs/compliance-roadmap.md b/docs/compliance-roadmap.md
index 8055735..0f7c520 100644
--- a/docs/compliance-roadmap.md
+++ b/docs/compliance-roadmap.md
@@ -2,7 +2,7 @@
 
 **Typ:** Lebendes Steuerungsdokument  
 **Erstellt:** 2026-05-10  
-**App-Version:** 0.8.86  
+**App-Version:** 0.8.87  
 **Zuletzt aktualisiert:** 2026-05-11
 
 ---
@@ -29,7 +29,7 @@ Diese Roadmap ist nach jedem Re-Audit zu aktualisieren. Abweichungen von der bis
 
 ## 2. Aktueller Stand (2026-05-11)
 
-### App-Version: 0.8.86
+### App-Version: 0.8.87
 
 ### Teilweise umgesetzte Pakete
 
@@ -55,13 +55,14 @@ Diese Roadmap ist nach jedem Re-Audit zu aktualisieren. Abweichungen von der bis
 | P-01c | _Nacharbeit:_ Admin-konfigurierbare Rechtstexte (DB 047, Superadmin-UI, API) | 0.8.71 |
 | P-01c+ | _Erweiterung:_ Als-Entwurf-kopieren (`copy-as-draft`) | 0.8.72 |
 | P-01c++ | _Erweiterung:_ Echter PDF-Download (jsPDF) + Abschnitts-Sortierung/-Einfügen | 0.8.74 |
+| P-13 | Content-Melde-Backend (Minimalversion, DSA/KRIT-03) | 0.8.87 |
 
-**Vollständig abgeschlossen:** 9 Hauptpakete + 4 Nacharbeiten + 2 Erweiterungen = 15 Umsetzungseinheiten  
+**Vollständig abgeschlossen:** 10 Hauptpakete + 4 Nacharbeiten + 2 Erweiterungen = 16 Umsetzungseinheiten  
 **Teilweise umgesetzt (technisch):** P-01, P-06
 
-### Offene Pakete (14)
+### Offene Pakete (13)
 
-P-02, P-08, P-09, P-10, P-13, P-14, P-15, P-16, P-17, P-18, P-19, P-20, P-21, P-22
+P-02, P-08, P-09, P-10, P-14, P-15, P-16, P-17, P-18, P-19, P-20, P-21, P-22
 
 ### Gesamtstatus
 
@@ -72,7 +73,7 @@ P-02, P-08, P-09, P-10, P-13, P-14, P-15, P-16, P-17, P-18, P-19, P-20, P-21, P-
 1. **P-01:** Kein Impressum, keine Datenschutzerklärung, keine AGB. Eine öffentlich erreichbare App ohne Impressum ist eine Ordnungswidrigkeit nach § 5 DDG.
 2. **P-06:** Keine Einwilligungserklärung beim Medienupload. Personenbilder können ohne jede Rechteabklärung hochgeladen werden.
 3. **P-02:** Nutzer können ihr Konto nicht selbst löschen (DSGVO Art. 17). Der Prozess ist noch nicht einmal fachlich spezifiziert.
-4. **P-13:** Keine Möglichkeit, rechtswidrige Inhalte zu melden. Bei einer UGC-Plattform mit öffentlichen Inhalten ist dies ein erhebliches Restrisiko, unabhängig davon, ob der DSA formal anwendbar ist.
+4. ~~**P-13:** Keine Möglichkeit, rechtswidrige Inhalte zu melden.~~ ✅ **Implementiert (v0.8.87).** Content-Melde-Backend umgesetzt: POST `/api/content-reports`, Admin-Inbox-Integration, P-11 Legal-Hold-Anbindung.
 5. ~~**P-11:** Kein Legal-Hold-Status.~~ ✅ **Implementiert (v0.8.84).**
 
 **Was geöffnet bleiben kann (mit Dokumentation):** Vereinsinterne Nutzung durch bekannte Trainer-Gruppen ist mit dem aktuellen Stand vertretbar, solange keine öffentliche Vermarktung stattfindet und kein `official`-Content aktiviert wird.
@@ -112,12 +113,10 @@ Die folgenden Pakete sind vor der Freigabe für allgemeine öffentliche Registri
 **Finding:** MITT-02  
 **Abgeschlossen:** 2026-05-11. Migration 051, `media_legal_hold.py`, Retention-Schutz, Superadmin-API + Frontend (0.8.84); UI-Bugfixes (0.8.85); vollständige Auslieferungssperre (`download_exercise_media_file` HTTP 451), Frontend-Placeholder in allen Übungskomponenten, Medienliste nur noch für Superadmin mit Legal-Hold-Einträgen (0.8.86). Details: `docs/compliance-package-register.md` §P-11.
 
-### Blocker 3 (neu) — P-13: Content-Melde-Backend (Minimalversion)
+### ~~Blocker 3 (neu) — P-13: Content-Melde-Backend (Minimalversion)~~ ✅ Implementiert (v0.8.87)
 
 **Finding:** KRIT-03  
-**Warum vorgezogen (Abweichung vom Initial-Audit):** → Siehe §4  
-**Minimalumfang:** Meldung einreichen + Moderations-Queue für Admin. Nicht der volle P-14–P-16-Stack.  
-**Abhängigkeit:** ~~P-11 (Legal-Hold)~~ ✅ bereits implementiert.
+**Abgeschlossen:** 2026-05-11. Migration 052 (`content_reports`); `POST /api/content-reports` (optionale Auth, official-Medien ohne Login meldbar); `GET /api/me/inbox/content-reports` (Plattform-Admin); `PATCH /api/content-reports/{id}`; `POST /api/content-reports/{id}/legal-hold` (Superadmin, P-11-Integration, reason_code-Mapping). Inbox-Erweiterung `InboxPage.jsx` mit zweitem Abschnitt „Inhaltsmeldungen". Keine separate Moderations-Queue — bestehende Admin-Inbox erweitert. 15 Backend-Unit-Tests. Details: `docs/compliance-package-register.md` §P-13.
 
 ### Blocker 5 — P-02: DSGVO-Self-Service (fachliche Spezifikation zuerst)
 
@@ -176,16 +175,11 @@ Reihenfolge innerhalb der Etappe ist flexibel; P-01 und P-06 haben keine gegense
 | P-01 | Rechtstexte technisch anlegen (Platzhalter-Seiten, Routen) | 2–4 h Technik | Inhalt durch Rechtsanwalt separat | „Freigabe zur Umsetzung P-01: Rechtstexte" |
 | P-06 | Upload-Einwilligungsdialog | 2–4 Tage | — | „Freigabe zur Umsetzung P-06: Upload-Einwilligungsdialog" |
 | ~~P-11~~ | ~~Legal-Hold Lifecycle-Status~~ | — | ✅ implementiert (v0.8.84) | — |
-| P-13 | Content-Melde-Backend (Minimalversion) | 3–5 Tage | P-11 ✅ bereits erfüllt | „Freigabe zur Umsetzung P-13: Content-Melde-Backend" |
+| ~~P-13~~ | ~~Content-Melde-Backend (Minimalversion)~~ | — | ✅ implementiert (v0.8.87) | — |
 
 **Hinweis P-01:** Die technische Anlage (leere Seiten, Routen `/impressum`, `/datenschutz`, `/nutzungsbedingungen`) ist von der juristischen Ausarbeitung des Inhalts zu trennen. Beide Teilschritte können unabhängig voneinander freigegeben und durchgeführt werden.
 
-**Hinweis P-13 Minimalumfang:** Im Rahmen von Etappe B umfasst P-13 ausschließlich:
-- `POST /api/reports` — Meldung einreichen
-- `GET /api/admin/reports` — Moderations-Queue
-- `PATCH /api/admin/reports/{id}` — Status setzen
-
-P-14 (Moderations-UI), P-15 (Uploader-Benachrichtigung), P-16 (Beschwerdeverfahren) folgen in Etappe D.
+**Hinweis P-13:** ✅ Implementiert (v0.8.87). Endpunkte und Architektur: `POST /api/content-reports`, `GET /api/me/inbox/content-reports`, `PATCH /api/content-reports/{id}`, `POST /api/content-reports/{id}/legal-hold`. Keine separate Moderations-Queue — bestehende Admin-Inbox erweitert. P-14 (Moderations-UI), P-15 (Uploader-Benachrichtigung), P-16 (Beschwerdeverfahren) folgen in Etappe D.
 
 ---
 
diff --git a/frontend/src/context/OrgInboxContext.jsx b/frontend/src/context/OrgInboxContext.jsx
index 8cbfe8d..68ab9f8 100644
--- a/frontend/src/context/OrgInboxContext.jsx
+++ b/frontend/src/context/OrgInboxContext.jsx
@@ -17,6 +17,10 @@ export function canAccessOrgInbox(user) {
   return activeClubMemberships(user.clubs).some((c) => (c.roles || []).includes('club_admin'))
 }
 
+function isPlatformAdmin(user) {
+  return user?.role === 'admin' || user?.role === 'superadmin'
+}
+
 /** Nach Annahme/Ablehnung: Posteingang-Badges & Widget aktualisieren */
 export function notifyOrgInboxChanged() {
   window.dispatchEvent(new Event('shinkan:inbox-changed'))
@@ -24,44 +28,66 @@ export function notifyOrgInboxChanged() {
 
 export function OrgInboxProvider({ user, children }) {
   const [items, setItems] = useState([])
+  const [contentReports, setContentReports] = useState([])
   const canAccess = useMemo(() => canAccessOrgInbox(user), [user])
+  const canAccessReports = useMemo(() => isPlatformAdmin(user), [user])
 
   const refresh = useCallback(async () => {
     if (!canAccess) {
       setItems([])
-      return
+    } else {
+      try {
+        const data = await api.getInboxJoinRequests()
+        setItems(Array.isArray(data) ? data : [])
+      } catch {
+        setItems([])
+      }
     }
-    try {
-      const data = await api.getInboxJoinRequests()
-      setItems(Array.isArray(data) ? data : [])
-    } catch {
-      setItems([])
+
+    if (!canAccessReports) {
+      setContentReports([])
+    } else {
+      try {
+        const data = await api.getInboxContentReports()
+        setContentReports(Array.isArray(data) ? data : [])
+      } catch {
+        setContentReports([])
+      }
     }
-  }, [canAccess])
+  }, [canAccess, canAccessReports])
 
   useEffect(() => {
-    if (!canAccess) {
+    if (!canAccess && !canAccessReports) {
       setItems([])
+      setContentReports([])
       return undefined
     }
     let cancelled = false
     ;(async () => {
-      try {
-        const data = await api.getInboxJoinRequests()
-        if (!cancelled) setItems(Array.isArray(data) ? data : [])
-      } catch {
-        if (!cancelled) setItems([])
+      if (canAccess) {
+        try {
+          const data = await api.getInboxJoinRequests()
+          if (!cancelled) setItems(Array.isArray(data) ? data : [])
+        } catch {
+          if (!cancelled) setItems([])
+        }
+      }
+      if (canAccessReports) {
+        try {
+          const data = await api.getInboxContentReports()
+          if (!cancelled) setContentReports(Array.isArray(data) ? data : [])
+        } catch {
+          if (!cancelled) setContentReports([])
+        }
       }
     })()
     return () => {
       cancelled = true
     }
-  }, [canAccess, user?.id])
+  }, [canAccess, canAccessReports, user?.id])
 
   useEffect(() => {
-    const onChange = () => {
-      refresh()
-    }
+    const onChange = () => { refresh() }
     window.addEventListener('shinkan:inbox-changed', onChange)
     return () => window.removeEventListener('shinkan:inbox-changed', onChange)
   }, [refresh])
@@ -70,10 +96,14 @@ export function OrgInboxProvider({ user, children }) {
     () => ({
       inboxJoinRequests: items,
       inboxCount: items.length,
+      contentReports,
+      contentReportCount: contentReports.filter((r) => r.status === 'submitted').length,
       refreshOrgInbox: refresh,
       canAccessOrgInbox: canAccess,
+      canAccessContentReports: canAccessReports,
+      isSuperadmin: user?.role === 'superadmin',
     }),
-    [items, refresh, canAccess]
+    [items, contentReports, refresh, canAccess, canAccessReports, user?.role]
   )
 
   return <OrgInboxContext.Provider value={value}>{children}</OrgInboxContext.Provider>
diff --git a/frontend/src/pages/InboxPage.jsx b/frontend/src/pages/InboxPage.jsx
index 2aead00..0c95095 100644
--- a/frontend/src/pages/InboxPage.jsx
+++ b/frontend/src/pages/InboxPage.jsx
@@ -10,6 +10,33 @@ const CLUB_ROLE_OPTIONS = [
   { code: 'content_editor', label: 'Inhalte bearbeiten' },
 ]
 
+const REASON_LABELS = {
+  copyright: 'Urheberrecht',
+  image_rights: 'Bildrechte',
+  privacy: 'Datenschutz / Persönlichkeitsrecht',
+  minors: 'Minderjährige',
+  illegal_content: 'Rechtswidriger Inhalt',
+  youth_protection: 'Jugendschutz',
+  offensive_content: 'Beleidigender Inhalt',
+  other: 'Sonstiges',
+}
+
+const STATUS_LABELS = {
+  submitted: 'Eingegangen',
+  under_review: 'In Bearbeitung',
+  resolved_no_action: 'Abgeschlossen (kein Handlungsbedarf)',
+  resolved_legal_hold: 'Abgeschlossen (Legal Hold)',
+  rejected_invalid: 'Abgewiesen (ungültig)',
+}
+
+const STATUS_COLORS = {
+  submitted: 'var(--accent)',
+  under_review: '#e8960a',
+  resolved_no_action: 'var(--text3)',
+  resolved_legal_hold: 'var(--danger)',
+  rejected_invalid: 'var(--text3)',
+}
+
 function formatWhen(iso) {
   if (!iso) return ''
   const s = String(iso)
@@ -19,13 +46,292 @@ function formatWhen(iso) {
   return time ? `${d} · ${time}` : d
 }
 
+function PriorityBadge({ priority }) {
+  if (priority !== 'high') return null
+  return (
+    <span
+      style={{
+        background: 'var(--danger)',
+        color: '#fff',
+        borderRadius: '4px',
+        padding: '2px 7px',
+        fontSize: '0.72rem',
+        fontWeight: 600,
+        marginLeft: '0.4rem',
+        verticalAlign: 'middle',
+      }}
+    >
+      DRINGEND
+    </span>
+  )
+}
+
+function ReportDetailModal({ report, onClose, onRefresh, isSuperadmin }) {
+  const [resolutionNote, setResolutionNote] = useState('')
+  const [legalHoldNote, setLegalHoldNote] = useState('')
+  const [saving, setSaving] = useState(false)
+  const [error, setError] = useState(null)
+  const [showLegalHoldForm, setShowLegalHoldForm] = useState(false)
+
+  const isOpen = report.status === 'submitted' || report.status === 'under_review'
+
+  async function handleStatus(status) {
+    if ((status === 'resolved_no_action' || status === 'rejected_invalid') && !resolutionNote.trim()) {
+      setError('Bitte eine Begründung eingeben.')
+      return
+    }
+    setSaving(true)
+    setError(null)
+    try {
+      await api.patchContentReport(report.id, {
+        status,
+        resolution_note: resolutionNote.trim() || undefined,
+      })
+      notifyOrgInboxChanged()
+      onRefresh()
+      onClose()
+    } catch (err) {
+      setError(err.message || String(err))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  async function handleUnderReview() {
+    setSaving(true)
+    setError(null)
+    try {
+      await api.patchContentReport(report.id, { status: 'under_review' })
+      notifyOrgInboxChanged()
+      onRefresh()
+      onClose()
+    } catch (err) {
+      setError(err.message || String(err))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  async function handleLegalHold() {
+    if (!legalHoldNote.trim()) {
+      setError('Begründung für Legal Hold erforderlich.')
+      return
+    }
+    setSaving(true)
+    setError(null)
+    try {
+      await api.setLegalHoldFromReport(report.id, { reason_note: legalHoldNote.trim() })
+      notifyOrgInboxChanged()
+      onRefresh()
+      onClose()
+    } catch (err) {
+      setError(err.message || String(err))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <div
+      style={{
+        position: 'fixed',
+        top: 0,
+        left: 0,
+        right: 0,
+        bottom: 0,
+        background: 'rgba(0,0,0,0.55)',
+        display: 'flex',
+        alignItems: 'flex-start',
+        justifyContent: 'center',
+        zIndex: 1100,
+        padding: '1rem',
+        overflowY: 'auto',
+      }}
+      onClick={(e) => { if (e.target === e.currentTarget) onClose() }}
+    >
+      <div
+        style={{
+          background: 'var(--surface)',
+          borderRadius: '12px',
+          padding: '1.5rem',
+          maxWidth: '560px',
+          width: '100%',
+          marginTop: '2rem',
+          marginBottom: '2rem',
+        }}
+      >
+        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', marginBottom: '1rem' }}>
+          <h2 style={{ margin: 0 }}>
+            Meldung #{report.id}
+            <PriorityBadge priority={report.priority} />
+          </h2>
+          <button type="button" className="btn btn-secondary" style={{ padding: '4px 10px' }} onClick={onClose}>✕</button>
+        </div>
+
+        <div style={{ display: 'flex', flexDirection: 'column', gap: '0.6rem', marginBottom: '1.2rem' }}>
+          <div>
+            <span className="muted" style={{ fontSize: '0.8rem' }}>Status</span>
+            <div style={{ fontWeight: 600, color: STATUS_COLORS[report.status] }}>
+              {STATUS_LABELS[report.status] || report.status}
+            </div>
+          </div>
+
+          <div>
+            <span className="muted" style={{ fontSize: '0.8rem' }}>Ziel</span>
+            <div>
+              {report.target_type === 'media_asset' ? 'Medium' : 'Übung'} #{report.target_id}
+              {report.target_name ? ` – ${report.target_name}` : ''}
+            </div>
+          </div>
+
+          <div>
+            <span className="muted" style={{ fontSize: '0.8rem' }}>Meldegrund</span>
+            <div>{REASON_LABELS[report.report_reason] || report.report_reason}</div>
+          </div>
+
+          <div>
+            <span className="muted" style={{ fontSize: '0.8rem' }}>Beschreibung</span>
+            <div style={{ whiteSpace: 'pre-wrap' }}>{report.report_description}</div>
+          </div>
+
+          <div>
+            <span className="muted" style={{ fontSize: '0.8rem' }}>Meldende Person</span>
+            <div>
+              {report.reporter_name}
+              {report.reporter_email ? ` · ${report.reporter_email}` : ''}
+              {report.reporter_profile_id ? ` · Profil #${report.reporter_profile_id}` : ' · anonym'}
+            </div>
+          </div>
+
+          <div>
+            <span className="muted" style={{ fontSize: '0.8rem' }}>Eingegangen</span>
+            <div>{formatWhen(report.submitted_at || report.created_at)}</div>
+          </div>
+
+          {report.resolution_note && (
+            <div>
+              <span className="muted" style={{ fontSize: '0.8rem' }}>Begründung</span>
+              <div style={{ whiteSpace: 'pre-wrap' }}>{report.resolution_note}</div>
+            </div>
+          )}
+
+          {report.legal_hold_active && (
+            <div style={{ background: 'rgba(216,90,48,0.1)', borderRadius: '8px', padding: '0.6rem 0.8rem' }}>
+              <span style={{ color: 'var(--danger)', fontWeight: 600 }}>Legal Hold aktiv</span>
+            </div>
+          )}
+        </div>
+
+        {error && (
+          <div style={{ color: 'var(--danger)', marginBottom: '0.75rem', fontSize: '0.9rem' }}>{error}</div>
+        )}
+
+        {isOpen && (
+          <div style={{ display: 'flex', flexDirection: 'column', gap: '0.75rem' }}>
+            {report.status === 'submitted' && (
+              <button type="button" className="btn btn-primary" onClick={handleUnderReview} disabled={saving}>
+                In Bearbeitung nehmen
+              </button>
+            )}
+
+            <div className="form-row">
+              <label className="form-label">Begründung (erforderlich für Abschluss/Abweisung)</label>
+              <textarea
+                className="form-input"
+                rows={2}
+                value={resolutionNote}
+                onChange={(e) => setResolutionNote(e.target.value)}
+                placeholder="Kurze Begründung der Entscheidung…"
+              />
+            </div>
+
+            <div style={{ display: 'flex', gap: '0.5rem', flexWrap: 'wrap' }}>
+              <button
+                type="button"
+                className="btn btn-secondary"
+                onClick={() => handleStatus('resolved_no_action')}
+                disabled={saving}
+              >
+                Kein Handlungsbedarf
+              </button>
+              <button
+                type="button"
+                className="btn btn-secondary"
+                onClick={() => handleStatus('rejected_invalid')}
+                disabled={saving}
+              >
+                Meldung abweisen
+              </button>
+            </div>
+
+            {isSuperadmin && !showLegalHoldForm && (
+              <button
+                type="button"
+                className="btn"
+                style={{ background: 'rgba(216,90,48,0.12)', color: 'var(--danger)', border: '1px solid var(--danger)' }}
+                onClick={() => setShowLegalHoldForm(true)}
+              >
+                Legal Hold setzen (Superadmin)
+              </button>
+            )}
+
+            {isSuperadmin && showLegalHoldForm && (
+              <div style={{ border: '1px solid var(--danger)', borderRadius: '8px', padding: '0.75rem' }}>
+                <div className="form-row">
+                  <label className="form-label" style={{ color: 'var(--danger)' }}>Begründung Legal Hold *</label>
+                  <textarea
+                    className="form-input"
+                    rows={2}
+                    value={legalHoldNote}
+                    onChange={(e) => setLegalHoldNote(e.target.value)}
+                    placeholder="Rechtliche Begründung für den Legal Hold…"
+                  />
+                </div>
+                <div style={{ display: 'flex', gap: '0.5rem', marginTop: '0.5rem' }}>
+                  <button
+                    type="button"
+                    className="btn"
+                    style={{ background: 'var(--danger)', color: '#fff', flex: 1 }}
+                    onClick={handleLegalHold}
+                    disabled={saving}
+                  >
+                    Legal Hold bestätigen
+                  </button>
+                  <button type="button" className="btn btn-secondary" onClick={() => setShowLegalHoldForm(false)}>
+                    Abbrechen
+                  </button>
+                </div>
+              </div>
+            )}
+          </div>
+        )}
+
+        {!isOpen && (
+          <p className="muted" style={{ margin: 0, fontSize: '0.9rem' }}>
+            Diese Meldung ist bereits abgeschlossen.
+          </p>
+        )}
+      </div>
+    </div>
+  )
+}
+
 export default function InboxPage() {
-  const { canAccessOrgInbox, refreshOrgInbox, inboxJoinRequests } = useOrgInbox()
+  const {
+    canAccessOrgInbox,
+    canAccessContentReports,
+    isSuperadmin,
+    refreshOrgInbox,
+    inboxJoinRequests,
+    contentReports,
+    contentReportCount,
+  } = useOrgInbox()
   const [loading, setLoading] = useState(true)
   const [acceptModal, setAcceptModal] = useState(null)
+  const [reportModal, setReportModal] = useState(null)
 
   const load = useCallback(async () => {
-    if (!canAccessOrgInbox) {
+    if (!canAccessOrgInbox && !canAccessContentReports) {
       setLoading(false)
       return
     }
@@ -35,13 +341,13 @@ export default function InboxPage() {
     } finally {
       setLoading(false)
     }
-  }, [canAccessOrgInbox, refreshOrgInbox])
+  }, [canAccessOrgInbox, canAccessContentReports, refreshOrgInbox])
 
   useEffect(() => {
     load()
   }, [load])
 
-  if (!canAccessOrgInbox) {
+  if (!canAccessOrgInbox && !canAccessContentReports) {
     return (
       <div className="app-page">
         <h1 className="page-title">Posteingang</h1>
@@ -61,7 +367,7 @@ export default function InboxPage() {
             Posteingang
           </h1>
           <p className="muted" style={{ marginTop: 0 }}>
-            Offene Beitrittsanträge zu Vereinen, für die du zuständig bist.
+            Beitrittsanträge und Inhaltsmeldungen für deine Zuständigkeitsbereiche.
           </p>
         </div>
         <button type="button" className="btn btn-secondary" onClick={() => load()} disabled={loading}>
@@ -73,68 +379,168 @@ export default function InboxPage() {
         <div style={{ padding: '2rem', textAlign: 'center' }}>
           <div className="spinner" />
         </div>
-      ) : inboxJoinRequests.length === 0 ? (
-        <div className="card" style={{ padding: '1.25rem' }}>
-          <p style={{ margin: 0 }} className="muted">
-            Keine offenen Beitrittsanträge.
-          </p>
-        </div>
       ) : (
-        <div className="inbox-page__list">
-          {inboxJoinRequests.map((req) => (
-            <div key={`${req.club_id}-${req.id}`} className="card inbox-request-card">
-              <div className="inbox-request-card__main">
-                <div className="inbox-request-card__club">
-                  {req.club_name || 'Verein'}
-                  {req.club_abbreviation ? (
-                    <span className="muted" style={{ marginLeft: '0.35rem' }}>
-                      ({req.club_abbreviation})
-                    </span>
-                  ) : null}
+        <>
+          {/* Abschnitt 1: Beitrittsanträge */}
+          {canAccessOrgInbox && (
+            <section style={{ marginBottom: '2rem' }}>
+              <h2 style={{ fontSize: '1rem', fontWeight: 600, marginBottom: '0.75rem', color: 'var(--text2)' }}>
+                Beitrittsanträge
+                {inboxJoinRequests.length > 0 && (
+                  <span
+                    style={{
+                      background: 'var(--accent)',
+                      color: '#fff',
+                      borderRadius: '12px',
+                      padding: '1px 8px',
+                      fontSize: '0.75rem',
+                      marginLeft: '0.5rem',
+                    }}
+                  >
+                    {inboxJoinRequests.length}
+                  </span>
+                )}
+              </h2>
+
+              {inboxJoinRequests.length === 0 ? (
+                <div className="card" style={{ padding: '1.25rem' }}>
+                  <p style={{ margin: 0 }} className="muted">Keine offenen Beitrittsanträge.</p>
                 </div>
-                <strong className="inbox-request-card__applicant">
-                  {req.applicant_name || req.applicant_email || 'Bewerber/in'}
-                </strong>
-                <div className="muted inbox-request-card__meta">
-                  {req.applicant_email} · Profil #{req.profile_id} · {formatWhen(req.created_at)}
+              ) : (
+                <div className="inbox-page__list">
+                  {inboxJoinRequests.map((req) => (
+                    <div key={`${req.club_id}-${req.id}`} className="card inbox-request-card">
+                      <div className="inbox-request-card__main">
+                        <div className="inbox-request-card__club">
+                          {req.club_name || 'Verein'}
+                          {req.club_abbreviation ? (
+                            <span className="muted" style={{ marginLeft: '0.35rem' }}>
+                              ({req.club_abbreviation})
+                            </span>
+                          ) : null}
+                        </div>
+                        <strong className="inbox-request-card__applicant">
+                          {req.applicant_name || req.applicant_email || 'Bewerber/in'}
+                        </strong>
+                        <div className="muted inbox-request-card__meta">
+                          {req.applicant_email} · Profil #{req.profile_id} · {formatWhen(req.created_at)}
+                        </div>
+                        {req.message ? <p className="inbox-request-card__message">{req.message}</p> : null}
+                      </div>
+                      <div className="inbox-request-card__actions">
+                        <button
+                          type="button"
+                          className="btn btn-primary"
+                          onClick={() =>
+                            setAcceptModal({
+                              id: req.id,
+                              club_id: req.club_id,
+                              label: req.applicant_name || req.applicant_email,
+                              roles: ['trainer'],
+                            })
+                          }
+                        >
+                          Annehmen
+                        </button>
+                        <button
+                          type="button"
+                          className="btn btn-secondary"
+                          onClick={async () => {
+                            if (!confirm('Antrag ablehnen?')) return
+                            try {
+                              await api.rejectClubJoinRequest(req.club_id, req.id)
+                              notifyOrgInboxChanged()
+                              await load()
+                            } catch (err) {
+                              alert(err.message || String(err))
+                            }
+                          }}
+                        >
+                          Ablehnen
+                        </button>
+                      </div>
+                    </div>
+                  ))}
                 </div>
-                {req.message ? <p className="inbox-request-card__message">{req.message}</p> : null}
-              </div>
-              <div className="inbox-request-card__actions">
-                <button
-                  type="button"
-                  className="btn btn-primary"
-                  onClick={() =>
-                    setAcceptModal({
-                      id: req.id,
-                      club_id: req.club_id,
-                      label: req.applicant_name || req.applicant_email,
-                      roles: ['trainer'],
-                    })
-                  }
-                >
-                  Annehmen
-                </button>
-                <button
-                  type="button"
-                  className="btn btn-secondary"
-                  onClick={async () => {
-                    if (!confirm('Antrag ablehnen?')) return
-                    try {
-                      await api.rejectClubJoinRequest(req.club_id, req.id)
-                      notifyOrgInboxChanged()
-                      await load()
-                    } catch (err) {
-                      alert(err.message || String(err))
-                    }
-                  }}
-                >
-                  Ablehnen
-                </button>
-              </div>
-            </div>
-          ))}
-        </div>
+              )}
+            </section>
+          )}
+
+          {/* Abschnitt 2: Inhaltsmeldungen (nur Plattform-Admins) */}
+          {canAccessContentReports && (
+            <section>
+              <h2 style={{ fontSize: '1rem', fontWeight: 600, marginBottom: '0.75rem', color: 'var(--text2)' }}>
+                Inhaltsmeldungen
+                {contentReportCount > 0 && (
+                  <span
+                    style={{
+                      background: 'var(--danger)',
+                      color: '#fff',
+                      borderRadius: '12px',
+                      padding: '1px 8px',
+                      fontSize: '0.75rem',
+                      marginLeft: '0.5rem',
+                    }}
+                  >
+                    {contentReportCount} neu
+                  </span>
+                )}
+              </h2>
+
+              {contentReports.length === 0 ? (
+                <div className="card" style={{ padding: '1.25rem' }}>
+                  <p style={{ margin: 0 }} className="muted">Keine Inhaltsmeldungen.</p>
+                </div>
+              ) : (
+                <div style={{ display: 'flex', flexDirection: 'column', gap: '0.75rem' }}>
+                  {contentReports.map((rep) => (
+                    <div
+                      key={rep.id}
+                      className="card"
+                      style={{
+                        padding: '1rem 1.25rem',
+                        cursor: 'pointer',
+                        borderLeft: rep.priority === 'high' ? '3px solid var(--danger)' : '3px solid transparent',
+                      }}
+                      onClick={() => setReportModal(rep)}
+                    >
+                      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', gap: '0.5rem' }}>
+                        <div>
+                          <span style={{ fontWeight: 600 }}>
+                            Meldung #{rep.id}
+                            <PriorityBadge priority={rep.priority} />
+                          </span>
+                          <span className="muted" style={{ marginLeft: '0.75rem', fontSize: '0.85rem' }}>
+                            {rep.target_type === 'media_asset' ? 'Medium' : 'Übung'} #{rep.target_id}
+                            {rep.target_name ? ` – ${rep.target_name}` : ''}
+                          </span>
+                        </div>
+                        <span
+                          style={{
+                            fontSize: '0.78rem',
+                            fontWeight: 500,
+                            color: STATUS_COLORS[rep.status],
+                            whiteSpace: 'nowrap',
+                          }}
+                        >
+                          {STATUS_LABELS[rep.status] || rep.status}
+                        </span>
+                      </div>
+                      <div className="muted" style={{ fontSize: '0.85rem', marginTop: '0.3rem' }}>
+                        {REASON_LABELS[rep.report_reason] || rep.report_reason}
+                        {' · '}
+                        {rep.reporter_name}
+                        {rep.reporter_profile_id ? ` (Profil #${rep.reporter_profile_id})` : ' (anonym)'}
+                        {' · '}
+                        {formatWhen(rep.submitted_at || rep.created_at)}
+                      </div>
+                    </div>
+                  ))}
+                </div>
+              )}
+            </section>
+          )}
+        </>
       )}
 
       {acceptModal && (
@@ -217,6 +623,15 @@ export default function InboxPage() {
           </div>
         </div>
       )}
+
+      {reportModal && (
+        <ReportDetailModal
+          report={reportModal}
+          isSuperadmin={isSuperadmin}
+          onClose={() => setReportModal(null)}
+          onRefresh={load}
+        />
+      )}
     </div>
   )
 }
diff --git a/frontend/src/utils/api.js b/frontend/src/utils/api.js
index 0778de4..ff79d6f 100644
--- a/frontend/src/utils/api.js
+++ b/frontend/src/utils/api.js
@@ -1592,6 +1592,18 @@ export const api = {
     request(`/api/admin/legal-documents/${id}/copy-as-draft`, { method: 'POST' }),
   getLegalDocumentAudit: (id) =>
     request(`/api/admin/legal-documents/${id}/audit`),
+
+  // P-13: Content-Melde-Backend
+  submitContentReport: (body) =>
+    request('/api/content-reports', { method: 'POST', body: JSON.stringify(body) }),
+  getInboxContentReports: () =>
+    request('/api/me/inbox/content-reports'),
+  getContentReport: (id) =>
+    request(`/api/content-reports/${id}`),
+  patchContentReport: (id, body) =>
+    request(`/api/content-reports/${id}`, { method: 'PATCH', body: JSON.stringify(body) }),
+  setLegalHoldFromReport: (id, body) =>
+    request(`/api/content-reports/${id}/legal-hold`, { method: 'POST', body: JSON.stringify(body) }),
 }
 
 export default api
diff --git a/frontend/src/version.js b/frontend/src/version.js
index c397729..5aa6e1e 100644
--- a/frontend/src/version.js
+++ b/frontend/src/version.js
@@ -1,6 +1,6 @@
 // Shinkan Jinkendo Frontend Version
 
-export const APP_VERSION = "0.8.86"
+export const APP_VERSION = "0.8.87"
 export const BUILD_DATE = "2026-05-11"
 
 export const PAGE_VERSIONS = {
@@ -25,4 +25,5 @@ export const PAGE_VERSIONS = {
   ExerciseInlineEmbedModal: "1.1.0",  // P-06: RightsDeclarationDialog vor Embed-Upload
   ExerciseMediaEmbed: "1.1.0",  // P-11: Legal-Hold-Placeholder statt Datei
   ExerciseMediaThumbTile: "1.1.0",  // P-11: Legal-Hold-Kachel statt Datei-Vorschau
+  InboxPage: "2.0.0",  // P-13: Inhaltsmeldungen-Abschnitt integriert
 }