Phase 2: Visibility Filter & Owner ID

- Add OwnedMixin to 15 models (contact_folder, user_preference, workspace,
  mcp_server_config, agent_definition, automation_definition, report_template,
  report_instance, entity_link, comm_conversation, proactive_suggestion,
  ai_agent, ai_chat_session, tag, share_link)
- Migration 0102: Add owner_id column to 15 tables with backfill from user_id
- Fix EntityPermission Registry: remove notification, add entity_attachment,
  entity_history, subtask, calendar, folder; fix wrong class names
  (DmsFile→File, CalendarEvent→CalendarEntry, Mailbox→MailAccount)
- Add apply_visibility_filter to list endpoints in tags, tasks, mcp_client,
  automation, report_generator, ai_assistant routes
- Add owner_id to create handlers for all new OwnedMixin models
- Patch tasks/services.py and automation/services.py list methods with
  user_id and is_system_admin parameters

SECURITY_FIX_PLAN.md

@@ -0,0 +1,170 @@
+# LeoCRM Security Fix Plan
+
+## Phase 1 — Kritische Sicherheitslücken (~8h)
+
+### 1.1 ✅ 59 Permissions im Registry ergänzen
+- 98 Permissions in Routes verwendet, nur 39 in CORE_PERMISSIONS
+- Fehlend: ai:read, ai:write, automation:admin, mcp:read, mcp:write, calendar:read, dms:read, mail:read, tasks:read, tags:read, reports:read, search:read, agents:read, permissions:delegations:read, etc.
+- Status: Implementiert und committed
+
+### 1.2 ✅ Grants einschränken (Migration 0100)
+- crm_api und crm_worker haben DELETE auf 12 sensitiven Tabellen: api_tokens, audit_log, notification_types, password_reset_tokens, plugin_allowlist, plugin_migrations, plugins, sessions, tenant_plugin_activation, tenants, user_tenants, users
+- Fix: DELETE für crm_api und crm_worker auf diesen Tabellen entfernen
+- crm_auth behält DELETE auf sessions + password_reset_tokens (für Logout/Reset)
+- Status: Migration erstellt und committed
+
+### 1.3 ❌ RLS auf Tabellen — ENTFERNT
+- RLS auf sessions, password_reset_tokens, api_tokens, sequences, tenant_plugin_activation, user_tenants
+- PROBLEM: Diese Tabellen werden vor/ohne Tenant-Context abgefragt → RLS blockiert Login/App-Startup
+- WICHTIG: Kein RLS auf Tabellen die den Login blockieren!
+- Status: Komplett aus Migration entfernt. Tabellen haben kein RLS wie vor der Änderung
+
+### 1.4 ✅ Mass-Assignment Schutz
+- UserCreate.role war setzbar (default viewer aber Client konnte admin senden)
+- UserUpdate.role war setzbar
+- Fix: UserCreate role=admin nur für is_system_admin. UserUpdate role=admin nur für is_system_admin
+- Status: Implementiert und committed
+
+### 1.5 ✅ Entity Permission Ownership-Check (PUT)
+- PUT /permissions/{type}/{id}/{pid} hatte keinen Ownership-Check
+- DELETE hatte einen Check
+- Fix: _check_entity_ownership Hilfsfunktion, in PUT ergänzt
+- Status: Implementiert und committed
+
+### 1.6 ✅ AttachmentResponse file_path entfernt
+- file_path: str in Schema Zeile 13 exponiert internen Storage-Pfad
+- Fix: Aus Schema entfernt
+- Status: Implementiert und committed
+
+### 1.7 ✅ SystemSettings sensible Felder maskiert
+- tax_number, iban, bic in Response Schema für alle sichtbar
+- Fix: Für non-admin User maskiert ("********")
+- Status: Implementiert und committed
+
+### 1.8 ✅ File Upload MIME-Validierung + Extensions
+- Nur Extension-Blocklist (ohne .php, .py, .asp, .jsp, .svg) + client-seitiger content_type (fälschbar)
+- Fix: BLOCKED_EXTENSIONS ergänzt (.php, .py, .pl, .asp, .aspx, .jsp, .svg, .htaccess, .phtml, .pht, .cgi, .cfm, .erb) + ALLOWED_MIME_PREFIXES Whitelist + MIME-Validierung in upload_file
+- Status: Implementiert und committed
+
+---
+
+## Phase 2 — Visibility Filter & Owner ID (~12h)
+
+### 2.1 Visibility Filter in 17 Services einbauen
+- ai_assistant, ai_proactive, automation, entity_links, kommunikation, mail, mcp_client, permissions, report_generator, tags, tasks, entity_permission_service, user_service, workspace_service
+- apply_visibility_filter funktioniert korrekt (tenant_id + owner_id + shared permissions + admin bypass)
+
+### 2.2 owner_id auf 26 Modellen ergänzen
+- Core (15): auth, contact_folder, contact_folder_permission, contact_merge, currency, entity_policy, group, guest_user, outbox, plugin, system_settings, tax, user, user_preference, workspace
+- Plugins (11): mcp_client, automation, unified_search, report_generator, entity_links, kommunikation, ai_proactive, ai_assistant, tags, permissions
+
+### 2.3 EntityPermission Registry korrigieren
+- notification, contact_folder entfernen (kein owner_id)
+- entity_attachment, entity_history, subtask, calendar, folder hinzufügen
+
+---
+
+## Phase 3 — Weitere Sicherheitslücken (~4h)
+
+### 3.1 WebSocket CSRF implementieren
+- Kommentar sagt "skip CSRF for now" — nicht implementiert
+- Fix: CSRF-Token aus Query-Parameter validieren
+
+### 3.2 SameSite auf Lax
+- session_cookie_samesite = "strict" blockiert WebSocket
+- Fix: Auf "lax" ändern
+
+### 3.3 Tenant FK CASCADE
+- 3 Tabellen ohne CASCADE (contact_merge_history, tenant_plugin_activation, user_tenants)
+- 10 Tabellen mit tenant_id aber ohne FK
+- Fix: CASCADE ergänzen, fehlende FKs hinzufügen
+
+---
+
+## Phase 4 — Krisensicherheit (~9h)
+
+### 4.1 Redis Fallback / Graceful Degradation
+- Bei Redis-Ausfall funktioniert nichts mehr
+- Fix: Session-Check → DB-Fallback, Permission-Cache → DB-Fallback, Rate-Limiting → in-memory Fallback
+
+### 4.2 DB-Connection Retry
+- Bei kurzem DB-Ausfall gibt es sofort 500er
+- Fix: Retry-Decorator (3 Versuche), 503 statt 500
+
+### 4.3 Circuit Breaker Middleware
+- Bei wiederholten Fehlern kein automatisches Fallback
+- Fix: Bei 5 Fehlern in 30s → Circuit öffnet → 503 für 60s → Half-Open → probieren
+
+---
+
+## Phase 5 — Architektur-Lücken (~40h)
+
+### 5.1 Öffentliche Plugin-Endpoints
+- Alle Plugin-Routes erfordern Auth
+- Fix: get_public_routes() Mechanismus, separate Router-Mountung ohne Auth-Dependency
+
+### 5.2 PWA aktivieren
+- Dateien da aber Vite Plugin nicht konfiguriert
+- Fix: vite-plugin-pwa installieren + konfigurieren, manifest.json, Service Worker
+
+### 5.3 Contacts embedding + Auto-Index
+- contacts hat KEINE embedding column — wichtigste Tabelle kann nicht semantisch suchen
+- Fix: Migration: ADD COLUMN embedding vector(768), CREATE INDEX, Auto-Indexierung
+
+### 5.4 Search Engine: alle Tabellen abdecken
+- Nur 5 Tabellen in Suche (contacts, mails, files, calendar_entries, comm_messages)
+- Fehlend: tasks, contactpersons, tags, comm_conversations, calendars, users, workflows, automation_runs, resources, ai_chat_sessions
+
+### 5.5 Plugin-Marketplace
+- Grundlage da (discover_external, plugin_allowlist, install from ZIP)
+- Fehlend: Echter Marketplace-Server, Plugin-Signatur-Verifikation, Plugin-Versionierung, UI
+
+### 5.6 Agent Memory (persistent)
+- Kein persistentes Agent Memory (nur Session-History)
+- Fix: agent_memories Tabelle mit embeddings, semantische Suche bei neuen Konversationen
+
+### 5.7 GraphRAG als Provider
+- Keine Graph-Struktur in DB oder Code
+- Fix: entity_relationships Tabelle, Graph-Traversal, als Provider in unified_search
+
+### 5.8 Subagents / Multi-Agent
+- Keine Subagents, keine Multi-Agent-Orchestrierung
+- automation/agent_comm.py hat Messaging-Infrastruktur
+- Fix: Agent kann Agent aufrufen, Agent-Coordinator
+
+### 5.9 Agent von außen erreichbar
+- Agent nur über WebUI erreichbar
+- Fix: API-Endpoint für externen Agent-Zugriff
+
+---
+
+## Verifizierte Fakten
+
+| Punkt | Ergebnis |
+|-------|---------|
+| 59 Permissions fehlen im Registry | ✅ Bestätigt |
+| crm_api + crm_worker DELETE auf 12 Tabellen | ✅ Bestätigt |
+| 5 Tabellen mit tenant_id aber ohne RLS | ✅ Bestätigt |
+| UserCreate.role setzbar | ✅ Bestätigt |
+| UserUpdate.role setzbar | ✅ Bestätigt |
+| PUT Entity Permission ohne Ownership-Check | ✅ Bestätigt |
+| AttachmentResponse.file_path exponiert | ✅ Bestätigt |
+| SystemSettings exponiert IBAN/BIC/Steuernummer | ✅ Bestätigt |
+| SameSite = strict | ✅ Bestätigt |
+| 17 Services ohne Visibility Filter | ✅ Bestätigt |
+| 26 Modelle ohne owner_id | ✅ Bestätigt |
+| WebSocket CSRF nicht implementiert | ✅ Bestätigt |
+| File Upload ohne echte MIME-Validierung | ✅ Bestätigt |
+| .env nicht in Git | ✅ Bereits gefixt |
+| password_reset_tokens RLS qual=true | ❌ War falsch — Tabelle hatte kein RLS |
+| DELETE Entity Permission ohne Ownership | ❌ War falsch — DELETE hat Check |
+
+---
+
+## WICHTIGE REGELN
+
+- KEIN manuelles Rumgepfusche auf der Produktions-DB
+- KEIN RLS auf Tabellen die den Login blockieren (sessions, password_reset_tokens, api_tokens, user_tenants, sequences, tenant_plugin_activation)
+- Deploy NUR über Coolify Tool (deploy_start)
+- Bei Deploy-Fehlern: Coolify DB nach Logs queryen, nicht manuell eingreifen
+- Login-Logik NIEMALS ändern

alembic/versions/0102_add_owner_id_to_phase2_tables.py

@@ -0,0 +1,69 @@
+"""Add owner_id column to Phase 2 tables for row-level ownership.
+
+Adds nullable owner_id (FK → users.id, ON DELETE SET NULL) to tables
+that gained OwnedMixin in Phase 2. For tables that already have a
+non-nullable user_id column, owner_id is backfilled from user_id.
+
+Revision ID: 0102
+"""
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID as PGUUID
+
+revision = "0102"
+down_revision = "0101"
+branch_labels = None
+depends_on = None
+
+# (table_name, has_user_id_to_backfill)
+TABLES = [
+    # Core models
+    ("contact_folders", True),
+    ("user_preferences", True),
+    ("workspaces", False),
+    # Plugin models
+    ("mcp_server_configs", False),
+    ("automation_agent_definitions", False),
+    ("automation_definitions", False),
+    ("report_templates", False),
+    ("report_instances", False),
+    ("entity_links", False),
+    ("comm_conversations", False),
+    ("ai_proactive_suggestions", True),
+    ("ai_agents", False),
+    ("ai_chat_sessions", True),
+    ("tags", False),
+    ("share_links", True),
+]
+
+
+def upgrade() -> None:
+    for table_name, _has_user_id in TABLES:
+        op.add_column(
+            table_name,
+            sa.Column(
+                "owner_id",
+                PGUUID(as_uuid=True),
+                sa.ForeignKey("users.id", ondelete="SET NULL"),
+                nullable=True,
+            ),
+        )
+        op.create_index(
+            f"ix_{table_name}_owner_id",
+            table_name,
+            ["owner_id"],
+        )
+
+    # Backfill owner_id from user_id where available
+    for table_name, has_user_id in TABLES:
+        if has_user_id:
+            op.execute(
+                f"UPDATE {table_name} SET owner_id = user_id WHERE owner_id IS NULL;"
+            )
+
+
+def downgrade() -> None:
+    for table_name, _ in TABLES:
+        op.drop_index(f"ix_{table_name}_owner_id", table_name=table_name)
+        op.drop_column(table_name, "owner_id")

app/models/contact_folder.py

@@ -14,9 +14,10 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class ContactFolder(Base, TenantMixin):
+class ContactFolder(Base, TenantMixin, OwnedMixin):
     """Hierarchical folder for organizing contacts.
 
     Folders are tenant-scoped and user-owned. A folder with parent_id=NULL

app/models/user_preference.py

@@ -11,9 +11,10 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class UserPreference(Base, TenantMixin):
+class UserPreference(Base, TenantMixin, OwnedMixin):
     """Per-user preference entry — stores a single UI preference as JSONB value.
 
     Keys are arbitrary strings (e.g. 'sidebar_collapsed', 'theme', 'active_tab').

app/models/workspace.py

@@ -30,9 +30,10 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class Workspace(Base, TenantMixin):
+class Workspace(Base, TenantMixin, OwnedMixin):
     """A workspace is a UI/navigation context for a user.
 
     It defines which modules are visible, which dashboard widgets appear,

app/plugins/builtins/ai_assistant/models.py

@@ -19,6 +19,7 @@ from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
 # --- Providers ---
@@ -101,7 +102,7 @@ class AIPreset(Base, TenantMixin):
 
 # --- Agents ---
 
-class AIAgent(Base, TenantMixin):
+class AIAgent(Base, TenantMixin, OwnedMixin):
     """AI agent with system prompt and assigned tools."""
 
     __tablename__ = "ai_agents"
@@ -128,7 +129,7 @@ class AIAgent(Base, TenantMixin):
 
 # --- Chat Sessions ---
 
-class AIChatSession(Base, TenantMixin):
+class AIChatSession(Base, TenantMixin, OwnedMixin):
     """Chat session for a user with a specific agent."""
 
     __tablename__ = "ai_chat_sessions"

app/plugins/builtins/ai_assistant/routes.py

@@ -330,9 +330,13 @@ async def list_agents(
     db: AsyncSession = Depends(get_db),
 ):
     tenant_id = uuid.UUID(current_user["tenant_id"])
-    result = await db.execute(
-        select(AIAgent).where(AIAgent.tenant_id == tenant_id)
+    user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
+    query = select(AIAgent).where(AIAgent.tenant_id == tenant_id)
+    query = await apply_visibility_filter(
+        db, query, "ai_agent", AIAgent, user_id, tenant_id, is_system_admin
     )
+    result = await db.execute(query)
     agents = list(result.scalars().all())
     return [agent_to_response(a) for a in agents]
 
@@ -344,6 +348,7 @@ async def create_agent(
     db: AsyncSession = Depends(get_db),
 ):
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
     await set_tenant_context(db, tenant_id)
 
     agent = AIAgent(
@@ -355,6 +360,7 @@ async def create_agent(
         is_active=data.is_active,
         config=data.config,
         tenant_id=tenant_id,
+        owner_id=user_id,
     )
     db.add(agent)
     await db.commit()
@@ -422,10 +428,13 @@ async def list_sessions(
 ):
     tenant_id = uuid.UUID(current_user["tenant_id"])
     user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
     stmt = (
         select(AIChatSession)
         .where(AIChatSession.tenant_id == tenant_id)
-        .where(AIChatSession.user_id == user_id)
+    )
+    stmt = await apply_visibility_filter(
+        db, stmt, "ai_chat_session", AIChatSession, user_id, tenant_id, is_system_admin
     )
     if is_sidebar is not None:
         stmt = stmt.where(AIChatSession.is_sidebar == is_sidebar)
@@ -470,6 +479,7 @@ async def create_session(
         is_sidebar=data.is_sidebar,
         folder_id=folder_id,
         tenant_id=tenant_id,
+        owner_id=user_id,
     )
     db.add(session)
     await db.commit()

app/plugins/builtins/ai_proactive/models.py

@@ -20,9 +20,10 @@ from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class ProactiveSuggestion(Base, TenantMixin):
+class ProactiveSuggestion(Base, TenantMixin, OwnedMixin):
     """A proactive AI suggestion generated from user context."""
 
     __tablename__ = "ai_proactive_suggestions"

app/plugins/builtins/ai_proactive/routes.py

@@ -16,6 +16,7 @@ from fastapi.responses import StreamingResponse
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db, set_tenant_context
+from app.core.visibility import apply_visibility_filter
 from app.core.event_bus import get_event_bus
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.ai_proactive.models import (

app/plugins/builtins/automation/agent_routes.py

@@ -13,6 +13,7 @@ from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db, set_tenant_context
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.automation.models import (
     AgentDefinition,
@@ -112,8 +113,11 @@ async def list_agents(
 ):
     """List agent definitions with optional filters."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
     items, total = await AgentService.list(
-        db, tenant_id, is_active=is_active, mode=mode, limit=limit, offset=offset
+        db, tenant_id, is_active=is_active, mode=mode, limit=limit, offset=offset,
+        user_id=user_id, is_system_admin=is_system_admin,
     )
     return AgentDefinitionListResponse(
         items=[_agent_to_response(a) for a in items],

app/plugins/builtins/automation/models.py

@@ -21,9 +21,10 @@ from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class AgentDefinition(Base, TenantMixin):
+class AgentDefinition(Base, TenantMixin, OwnedMixin):
     """An AI agent definition — configures an LLM-powered agent with tools and behavior."""
 
     __tablename__ = "automation_agent_definitions"
@@ -89,7 +90,7 @@ class AgentVersion(Base, TenantMixin):
     )
 
 
-class AutomationDefinition(Base, TenantMixin):
+class AutomationDefinition(Base, TenantMixin, OwnedMixin):
     """An automation workflow definition — event/schedule/manual triggered with conditions and actions."""
 
     __tablename__ = "automation_definitions"

app/plugins/builtins/automation/routes.py

@@ -13,6 +13,7 @@ from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db, set_tenant_context
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.automation.models import (
     AutomationDefinition,
@@ -112,9 +113,12 @@ async def list_automations(
 ):
     """List automation definitions with optional filters."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
     items, total = await AutomationService.list(
         db, tenant_id, trigger_type=trigger_type, is_active=is_active,
         limit=limit, offset=offset,
+        user_id=user_id, is_system_admin=is_system_admin,
     )
     return AutomationDefinitionListResponse(
         items=[_automation_to_response(a) for a in items],

app/plugins/builtins/automation/services.py

@@ -11,6 +11,7 @@ from datetime import UTC, datetime
 from typing import Any
 
 from sqlalchemy import func, select, text, update
+from app.core.visibility import apply_visibility_filter
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.plugins.builtins.automation.models import (
@@ -40,9 +41,15 @@ class AgentService:
         mode: str | None = None,
         limit: int = 50,
         offset: int = 0,
+        user_id: uuid.UUID | None = None,
+        is_system_admin: bool = False,
     ) -> tuple[list[AgentDefinition], int]:
         """List agent definitions with optional filters."""
         query = select(AgentDefinition).where(AgentDefinition.tenant_id == tenant_id)
+        if user_id and not is_system_admin:
+            query = await apply_visibility_filter(
+                db, query, "agent_definition", AgentDefinition, user_id, tenant_id, is_system_admin
+            )
         count_query = select(func.count()).select_from(AgentDefinition).where(
             AgentDefinition.tenant_id == tenant_id
         )
@@ -108,6 +115,7 @@ class AgentService:
             max_duration_seconds=data.get("max_duration_seconds", 300),
             budget_limit_usd=data.get("budget_limit_usd", 1.0),
             created_by=user_id,
+            owner_id=user_id,
         )
         db.add(agent)
         await db.flush()
@@ -291,11 +299,17 @@ class AutomationService:
         is_active: bool | None = None,
         limit: int = 50,
         offset: int = 0,
+        user_id: uuid.UUID | None = None,
+        is_system_admin: bool = False,
     ) -> tuple[list[AutomationDefinition], int]:
         """List automation definitions with optional filters."""
         query = select(AutomationDefinition).where(
             AutomationDefinition.tenant_id == tenant_id
         )
+        if user_id and not is_system_admin:
+            query = await apply_visibility_filter(
+                db, query, "automation_definition", AutomationDefinition, user_id, tenant_id, is_system_admin
+            )
         count_query = (
             select(func.count())
             .select_from(AutomationDefinition)
@@ -366,6 +380,7 @@ class AutomationService:
             is_active=data.get("is_active", True),
             dry_run=data.get("dry_run", False),
             created_by=user_id,
+            owner_id=user_id,
         )
         db.add(automation)
         await db.flush()

app/plugins/builtins/entity_links/models.py

@@ -9,9 +9,10 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class EntityLink(Base, TenantMixin):
+class EntityLink(Base, TenantMixin, OwnedMixin):
     """N:M link between files/folders and companies/contacts."""
 
     __tablename__ = "entity_links"

app/plugins/builtins/entity_links/routes.py

@@ -9,6 +9,7 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.entity_links.models import EntityLink
 from app.plugins.builtins.entity_links.schemas import EntityLinkRequest
@@ -92,6 +93,7 @@ async def unlink_file_from_entity(
 ):
     """Remove a link between a file and an entity."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
     fid = _parse_uuid(file_id, "file_id")
     entity_id = _parse_uuid(body.entity_id, "entity_id")
 
@@ -119,6 +121,7 @@ async def list_file_links(
 ):
     """List all entities linked to a file."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
     fid = _parse_uuid(file_id, "file_id")
 
     result = await db.execute(

app/plugins/builtins/kommunikation/models.py

@@ -21,9 +21,10 @@ from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class CommConversation(Base, TenantMixin):
+class CommConversation(Base, TenantMixin, OwnedMixin):
     """Conversation / Room — tenant-scoped, supports pinning, locking, archiving."""
 
     __tablename__ = "comm_conversations"

app/plugins/builtins/kommunikation/routes.py

@@ -11,6 +11,7 @@ from fastapi import APIRouter, Depends, HTTPException, Query, UploadFile, File,
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.kommunikation.rbac import CommRBAC
 from app.plugins.builtins.kommunikation.schemas import (

app/plugins/builtins/kommunikation/services.py

@@ -258,6 +258,7 @@ async def create_conversation(
     conv = CommConversation(
         tenant_id=tenant_id,
         title=title,
+        owner_id=user_id,
         is_direct=is_direct,
         created_by=user_id,
         created_by_type="user",
@@ -1068,6 +1069,7 @@ async def create_plugin_room(
     conv = CommConversation(
         tenant_id=tenant_id,
         title=title,
+        owner_id=user_id,
         is_locked=True,
         locked_by=plugin_name,
         is_direct=False,

app/plugins/builtins/mcp_client/models.py

@@ -10,9 +10,10 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class McpServerConfig(Base, TenantMixin):
+class McpServerConfig(Base, TenantMixin, OwnedMixin):
     """Configuration for an external MCP server — tenant-scoped."""
 
     __tablename__ = "mcp_server_configs"

app/plugins/builtins/mcp_client/routes.py

@@ -12,6 +12,7 @@ from sqlalchemy import select, update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.mcp_client.client import McpClient
 from app.plugins.builtins.mcp_client.models import McpServerConfig as McpServerConfigModel
@@ -50,7 +51,13 @@ async def list_mcp_servers(
     current_user: dict[str, Any] = Depends(require_permission("mcp-client:read")),
 ) -> list[McpServerConfigResponse]:
     """List all configured MCP servers for the current tenant."""
-    stmt = select(McpServerConfigModel).where(McpServerConfigModel.tenant_id == uuid.UUID(current_user["tenant_id"]))
+    tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
+    stmt = select(McpServerConfigModel).where(McpServerConfigModel.tenant_id == tenant_id)
+    stmt = await apply_visibility_filter(
+        db, stmt, "mcp_server_config", McpServerConfigModel, user_id, tenant_id, is_system_admin
+    )
     result = await db.execute(stmt)
     configs = result.scalars().all()
     return [_config_to_response(c) for c in configs]
@@ -71,6 +78,7 @@ async def create_mcp_server(
         enabled=body.enabled,
         description=body.description,
         created_by=uuid.UUID(current_user["user_id"]),
+        owner_id=uuid.UUID(current_user["user_id"]),
     )
     db.add(cfg)
     await db.commit()

app/plugins/builtins/permissions/models.py

@@ -10,6 +10,7 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
 class Permission(Base, TenantMixin):
@@ -37,7 +38,7 @@ class Permission(Base, TenantMixin):
     access_level: Mapped[str] = mapped_column(String(10), nullable=False, default="read")
 
 
-class ShareLink(Base, TenantMixin):
+class ShareLink(Base, TenantMixin, OwnedMixin):
     """Public share link for a file — optional password and expiry."""
 
     __tablename__ = "share_links"

app/plugins/builtins/permissions/routes.py

@@ -12,6 +12,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.auth import hash_password, verify_password
 from app.core.db import get_db
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.permissions.models import Permission, ShareLink
 from app.plugins.builtins.permissions.schemas import (
@@ -48,6 +49,7 @@ async def list_permissions(
 ):
     """List all permissions for a file."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
     fid = _parse_uuid(file_id, "file_id")
 
     result = await db.execute(
@@ -78,6 +80,7 @@ async def grant_permission(
 ):
     """Grant a permission on a file to a user."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
     fid = _parse_uuid(file_id, "file_id")
     user_id = _parse_uuid(body.user_id, "user_id")
     group_id = _parse_uuid(body.group_id, "group_id") if body.group_id else None
@@ -123,6 +126,7 @@ async def revoke_permission(
 ):
     """Revoke all permissions for a user on a file."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
     fid = _parse_uuid(file_id, "file_id")
     uid = _parse_uuid(user_id, "user_id")
 

app/plugins/builtins/report_generator/models.py

@@ -9,9 +9,10 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class ReportTemplate(Base, TenantMixin):
+class ReportTemplate(Base, TenantMixin, OwnedMixin):
     """Report template entity — Jinja2 or SQL template, tenant-scoped, soft-deletable."""
 
     __tablename__ = "report_templates"
@@ -35,7 +36,7 @@ class ReportTemplate(Base, TenantMixin):
     created_by: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), nullable=False)
 
 
-class ReportInstance(Base, TenantMixin):
+class ReportInstance(Base, TenantMixin, OwnedMixin):
     """Report instance entity — a generated report, tenant-scoped."""
 
     __tablename__ = "report_instances"

app/plugins/builtins/report_generator/routes.py

@@ -16,6 +16,7 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.contact import Contact
+from app.core.visibility import apply_visibility_filter
 from app.models.audit import AuditLog
 
 from app.core.db import get_db, set_tenant_context
@@ -292,12 +293,16 @@ async def list_templates(
 ):
     """List all report templates for the current tenant."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
-    result = await db.execute(
-        select(ReportTemplate).where(
-            ReportTemplate.tenant_id == tenant_id,
-            ReportTemplate.deleted_at.is_(None),
-        )
+    user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
+    query = select(ReportTemplate).where(
+        ReportTemplate.tenant_id == tenant_id,
+        ReportTemplate.deleted_at.is_(None),
     )
+    query = await apply_visibility_filter(
+        db, query, "report_template", ReportTemplate, user_id, tenant_id, is_system_admin
+    )
+    result = await db.execute(query)
     templates = result.scalars().all()
     return [_template_to_response(t).model_dump() for t in templates]
 
@@ -319,6 +324,7 @@ async def create_template(
         content=body.content,
         output_format=body.output_format,
         created_by=user_id,
+        owner_id=user_id,
     )
     db.add(template)
     await db.flush()

app/plugins/builtins/tags/models.py

@@ -9,9 +9,10 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
+from app.models.owned_mixin import OwnedMixin
 
 
-class Tag(Base, TenantMixin):
+class Tag(Base, TenantMixin, OwnedMixin):
     """Tag entity — globally managed, tenant-scoped."""
 
     __tablename__ = "tags"

app/plugins/builtins/tags/routes.py

@@ -9,6 +9,7 @@ from sqlalchemy import delete, func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.tags.models import Tag, TagAssignment
 from app.plugins.builtins.tags.schemas import (
@@ -40,6 +41,8 @@ async def list_tags(
 ):
     """List all tags with entity counts."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
 
     # Subquery for entity counts per tag
     count_sq = (
@@ -52,12 +55,16 @@ async def list_tags(
         .subquery()
     )
 
-    result = await db.execute(
+    query = (
         select(Tag, func.coalesce(count_sq.c.entity_count, 0))
         .outerjoin(count_sq, Tag.id == count_sq.c.tag_id)
         .where(Tag.tenant_id == tenant_id)
         .order_by(Tag.name)
     )
+    query = await apply_visibility_filter(
+        db, query, "tag", Tag, user_id, tenant_id, is_system_admin
+    )
+    result = await db.execute(query)
     rows = result.all()
 
     return [
@@ -79,6 +86,7 @@ async def create_tag(
 ):
     """Create a new tag."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
 
     # Check name uniqueness within tenant
     existing = await db.execute(
@@ -87,7 +95,7 @@ async def create_tag(
     if existing.scalar_one_or_none() is not None:
         raise HTTPException(409, detail={"detail": "Tag name already exists", "code": "duplicate"})
 
-    tag = Tag(tenant_id=tenant_id, name=body.name, color=body.color)
+    tag = Tag(tenant_id=tenant_id, name=body.name, color=body.color, owner_id=user_id)
     db.add(tag)
     await db.flush()
     return {

app/plugins/builtins/tasks/routes.py

@@ -8,6 +8,7 @@ from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db
+from app.core.visibility import apply_visibility_filter
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.tasks import services
 from app.plugins.builtins.tasks.schemas import (
@@ -43,12 +44,15 @@ async def list_tasks(
 ):
     """List tasks with filtering and pagination."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
+    is_system_admin = current_user.get("is_system_admin", False)
     return await services.list_tasks(
         db, tenant_id,
         page=page, page_size=page_size,
         status=status, priority=priority,
         assigned_to=assigned_to, contact_id=contact_id,
         search=search,
+        user_id=user_id, is_system_admin=is_system_admin,
     )
 
 

app/plugins/builtins/tasks/services.py

@@ -9,6 +9,7 @@ from typing import Any
 from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.core.visibility import apply_visibility_filter
 from app.plugins.builtins.tasks.models import Task
 
 
@@ -40,10 +41,17 @@ async def list_tasks(
     assigned_to: str | None = None,
     contact_id: str | None = None,
     search: str | None = None,
+    user_id: uuid.UUID | None = None,
+    is_system_admin: bool = False,
 ) -> dict[str, Any]:
     """List tasks with filtering and pagination."""
     query = select(Task).where(Task.tenant_id == tenant_id, Task.deleted_at.is_(None))
 
+    if user_id and not is_system_admin:
+        query = await apply_visibility_filter(
+            db, query, "task", Task, user_id, tenant_id, is_system_admin
+        )
+
     if status:
         query = query.where(Task.status == status)
     if priority:
@@ -103,6 +111,7 @@ async def create_task(
         assigned_to=uuid.UUID(data["assigned_to"]) if data.get("assigned_to") else None,
         contact_id=uuid.UUID(data["contact_id"]) if data.get("contact_id") else None,
         created_by=user_id,
+        owner_id=user_id,
     )
     db.add(task)
     await db.flush()

app/services/entity_permission_service.py

@@ -36,7 +36,6 @@ from app.models.sequence import Sequence
 from app.models.saved_filter import SavedFilter
 from app.models.saved_view import SavedView
 from app.models.webhook import Webhook
-from app.models.notification import Notification
 from app.models.custom_field_definition import CustomFieldDefinition
 from app.models.contact_folder import ContactFolder
 
@@ -56,20 +55,46 @@ ENTITY_MODELS: dict[str, type] = {
     "saved_filter": SavedFilter,
     "saved_view": SavedView,
     "webhook": Webhook,
-    "notification": Notification,
     "custom_field_definition": CustomFieldDefinition,
     "contact_folder": ContactFolder,
 }
 
-# Try to add plugin models if available
+# Core models with OwnedMixin (Phase 2 additions)
 try:
-    from app.plugins.builtins.dms.models import DmsFile
-    ENTITY_MODELS["dms_file"] = DmsFile
+    from app.models.entity_attachment import EntityAttachment
+    ENTITY_MODELS["entity_attachment"] = EntityAttachment
 except ImportError:
     pass
 try:
-    from app.plugins.builtins.calendar.models import CalendarEvent
-    ENTITY_MODELS["calendar_event"] = CalendarEvent
+    from app.models.entity_history import EntityHistory
+    ENTITY_MODELS["entity_history"] = EntityHistory
+except ImportError:
+    pass
+
+# Plugin models if available
+try:
+    from app.plugins.builtins.dms.models import File as DmsFile
+    ENTITY_MODELS["file"] = DmsFile
+except ImportError:
+    pass
+try:
+    from app.plugins.builtins.dms.models import Folder as DmsFolder
+    ENTITY_MODELS["folder"] = DmsFolder
+except ImportError:
+    pass
+try:
+    from app.plugins.builtins.calendar.models import CalendarEntry
+    ENTITY_MODELS["calendar_event"] = CalendarEntry
+except ImportError:
+    pass
+try:
+    from app.plugins.builtins.calendar.models import Calendar
+    ENTITY_MODELS["calendar"] = Calendar
+except ImportError:
+    pass
+try:
+    from app.plugins.builtins.calendar.models import Subtask
+    ENTITY_MODELS["subtask"] = Subtask
 except ImportError:
     pass
 try:
@@ -78,8 +103,8 @@ try:
 except ImportError:
     pass
 try:
-    from app.plugins.builtins.mail.models import Mailbox
-    ENTITY_MODELS["mailbox"] = Mailbox
+    from app.plugins.builtins.mail.models import MailAccount
+    ENTITY_MODELS["mailbox"] = MailAccount
 except ImportError:
     pass