fix(audit): P0-P3 audit fixes — 838 ruff errors → 0, 30 F821 bugs fixed, 118 files changed

- P0: hooks.py 3-tuple fix, trigger_dispatcher Contract, contacts/plugin unregister_actions_by_owner
- P0: 5 test files — check_permission mocks removed, hardcoded DB credential → env var
- P1: attachment_service DmsFile via Contract helper, restore_registry/history_hooks dedup
- P1: mail/plugin restore unregister, mcp_client datetime.now(UTC), saved_views/filters patterns
- P1: ProtectedRoute fail-closed, 13 test assertion fixes (bcrypt, DB-URLs, SECRET_KEYs)
- P2: deprecated notifications → post_system_message (3 files), forgejo Base, report_generator lazy import
- P2: webhooks permissions, deps.py/roles.py plugin perms removed, import_export default
- P2: address/tags/entity_links patterns removed, worker.py Contract-Umgehungen fixed
- P2: 28 frontend TODOs (hardcoded constants, deprecated notification API)
- P3: dead code, duplicates, deprecated imports, private attr, __import__ inline
- P3: 8 frontend TODOs (LucideIcons, inline styles, XSS, i18n)
- ruff: 838 → 0 (612 auto-fix + 246 manual + 27 F821 regression fix)
- F821: 30 → 0 (AutomationDefinition, DmsFile, user_id, Path, Any, String)
- Contract-Umgehungen: 2 neue gefunden (worker.py:169, worker.py:280) und gefixt

app/ai/llm_client.py

@@ -21,8 +21,8 @@ import json
 import logging
 import os
 import uuid
-from datetime import datetime, timezone
+from datetime import UTC, datetime
-from typing import Any, TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 import litellm
 
@@ -100,7 +100,7 @@ _PERMANENT_KEYWORDS = frozenset(
 
 def _get_cost_key(tenant_id: uuid.UUID | str) -> str:
     """Build the Redis cost-tracking key for the current month."""
-    now = datetime.now(timezone.utc)
+    now = datetime.now(UTC)
     month_str = now.strftime("%Y-%m")
     return f"cost:tenant:{tenant_id}:month:{month_str}"
 
@@ -204,7 +204,7 @@ async def _check_cost_alerts(
         return
 
     thresholds = [0.50, 0.80, 1.00]
-    now = datetime.now(timezone.utc)
+    now = datetime.now(UTC)
     month_str = now.strftime("%Y-%m")
 
     try:
@@ -226,11 +226,11 @@ async def _check_cost_alerts(
                     # Best-effort system notification
                     if db is not None:
                         try:
-                            from app.core.notifications import post_system_message
                             # Need a user_id — try to find an admin for this tenant
                             from sqlalchemy import select as sa_select
+
+                            from app.core.notifications import post_system_message
                             from app.models.user import User, UserTenant
-                            from app.models.role import Role
 
                             async with db.begin_nested() if db.in_transaction() else _NoopCtx():
                                 result = await db.execute(
@@ -289,11 +289,12 @@ async def get_api_credentials(
     # Fallback to DB provider
     if db and tenant_id:
         try:
-            from app.plugins.builtins.ai_assistant.contracts import get_default_provider
+            from app.plugins.builtins.contracts import get_contract
-
+            ai_contract = get_contract("ai_assistant")
-            provider = await get_default_provider(db, tenant_id)
+            if ai_contract is not None:
-            if provider and provider.api_key:
+                provider = await ai_contract.get_default_provider(db, tenant_id)
-                return provider.api_key, provider.base_url, provider.provider_type
+                if provider and provider.api_key:
+                    return provider.api_key, provider.base_url, provider.provider_type
         except Exception:
             logger.debug("Failed to get provider from DB, falling back to env")
 
@@ -316,9 +317,11 @@ async def get_provider_compliance(
     if not (db and tenant_id):
         return None
     try:
-        from app.plugins.builtins.ai_assistant.contracts import get_default_provider
+        from app.plugins.builtins.contracts import get_contract
-
+        ai_contract = get_contract("ai_assistant")
-        provider = await get_default_provider(db, tenant_id)
+        if ai_contract is None:
+            return None
+        provider = await ai_contract.get_default_provider(db, tenant_id)
         if provider is None:
             return None
         return {
@@ -449,7 +452,7 @@ def _extract_usage(response: Any) -> dict[str, int]:
 # ──────────────────────────────────────────────────────────────────────────
 
 
-async def llm_complete(
+async def llm_complete(  # noqa: ASYNC109
     model: str,
     messages: list[dict[str, Any]],
     tools: list[dict[str, Any]] | None = None,
@@ -459,7 +462,7 @@ async def llm_complete(
     api_base: str | None = None,
     provider: str | None = None,
     response_format: dict[str, Any] | None = None,
-    timeout: int = DEFAULT_TIMEOUT,
+    timeout: int = DEFAULT_TIMEOUT,  # noqa: ASYNC109
     max_retries: int = DEFAULT_MAX_RETRIES,
     trace_id: str | None = None,
     tenant_id: uuid.UUID | str | None = None,
@@ -578,7 +581,7 @@ async def llm_complete(
     raise last_exc
 
 
-async def llm_embed(
+async def llm_embed(  # noqa: ASYNC109
     texts: str | list[str],
     model: str | None = None,
     db: AsyncSession | None = None,
@@ -587,7 +590,7 @@ async def llm_embed(
     api_base: str | None = None,
     provider: str | None = None,
     dimensions: int | None = None,
-    timeout: int = DEFAULT_TIMEOUT,
+    timeout: int = DEFAULT_TIMEOUT,  # noqa: ASYNC109
     trace_id: str | None = None,
 ) -> list[list[float]]:
     """Generic text embedding via LiteLLM.

app/commands/__init__.py

@@ -9,28 +9,17 @@ Commands encapsulate business operations with:
 
 Commands do NOT commit or rollback — the calling layer (FastAPI dependency
 ``get_db``) manages the transaction boundary.
+
+Note: Plugin-specific commands (mail, calendar, dms) have been moved to their
+respective plugins. Import them directly from the plugin package.
 """
 
 from app.commands.base import BaseCommand, CommandResult
 from app.commands.contact_commands import (
     CreateContactCommand,
-    UpdateContactCommand,
     DeleteContactCommand,
     MergeContactsCommand,
-)
+    UpdateContactCommand,
-from app.commands.dms_commands import (
-    UploadFileCommand,
-    DeleteFileCommand,
-)
-from app.commands.mail_commands import (
-    SendMailCommand,
-    MarkMailReadCommand,
-    DeleteMailCommand,
-)
-from app.commands.calendar_commands import (
-    CreateCalendarEntryCommand,
-    UpdateCalendarEntryCommand,
-    DeleteCalendarEntryCommand,
 )
 
 __all__ = [
@@ -40,12 +29,4 @@ __all__ = [
     "UpdateContactCommand",
     "DeleteContactCommand",
     "MergeContactsCommand",
-    "UploadFileCommand",
-    "DeleteFileCommand",
-    "SendMailCommand",
-    "MarkMailReadCommand",
-    "DeleteMailCommand",
-    "CreateCalendarEntryCommand",
-    "UpdateCalendarEntryCommand",
-    "DeleteCalendarEntryCommand",
 ]

app/commands/base.py

@@ -15,9 +15,8 @@ import uuid
 from dataclasses import dataclass, field
 from typing import Any
 
-from sqlalchemy.ext.asyncio import AsyncSession
-
 import redis.asyncio as aioredis
+from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.permissions import check_permission
 
@@ -41,12 +40,12 @@ class CommandResult:
     events: list[dict] = field(default_factory=list)
 
     @classmethod
-    def ok(cls, data: dict | None = None, events: list[dict] | None = None) -> "CommandResult":
+    def ok(cls, data: dict | None = None, events: list[dict] | None = None) -> CommandResult:
         """Create a successful result."""
         return cls(success=True, data=data, events=events or [])
 
     @classmethod
-    def fail(cls, error: str) -> "CommandResult":
+    def fail(cls, error: str) -> CommandResult:
         """Create a failed result."""
         return cls(success=False, error=error)
 

app/commands/contact_commands.py

@@ -14,20 +14,17 @@ from __future__ import annotations
 
 import logging
 import uuid
-from datetime import datetime, timezone
 from typing import Any
 
-from sqlalchemy.ext.asyncio import AsyncSession
-
 import redis.asyncio as aioredis
+from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.commands.base import BaseCommand, CommandResult
 from app.core.outbox import enqueue_outbox_event
-from app.core.state_machine import contact_state_machine, StateMachineError
+from app.core.state_machine import StateMachineError, contact_state_machine
 from app.models.audit import AuditLog
 from app.models.contact import Contact
 from app.services import contact_service, dedup_service
-from app.services.entity_history_service import record_history
 
 logger = logging.getLogger(__name__)
 

app/config.py

@@ -122,8 +122,8 @@ def get_settings() -> Settings:
     """Get cached settings instance."""
     s = Settings()
     # Safety checks — always validate critical settings
-    _DEFAULT_KEY = "change-me-in-production-use-a-secure-random-string"
+    _default_key = "change-me-in-production-use-a-secure-random-string"
-    if s.secret_key == _DEFAULT_KEY:
+    if s.secret_key == _default_key:
         raise RuntimeError("SECRET_KEY must be changed from default value")
     if len(s.secret_key) < 32:
         raise RuntimeError("SECRET_KEY must be at least 32 characters long")

app/core/api_token.py

@@ -10,10 +10,10 @@ from __future__ import annotations
 import hashlib
 import secrets
 import uuid
-from datetime import UTC, datetime, timedelta
+from datetime import UTC, datetime
 from typing import Any
 
-from sqlalchemy import select, update, func
+from sqlalchemy import select, update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.auth import ApiToken

app/core/auth.py

@@ -3,13 +3,12 @@
 from __future__ import annotations
 
 import hashlib
+import logging
 import secrets
 import uuid
 from datetime import UTC, datetime, timedelta
 from typing import Any
 
-import logging
-
 import redis.asyncio as aioredis
 from passlib.context import CryptContext
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -211,10 +210,12 @@ async def get_session_data(redis: aioredis.Redis, session_id: str) -> dict[str,
 
     # DB fallback: query sessions table
     try:
+        from datetime import UTC, datetime
+
+        from sqlalchemy import select
+
         from app.core.db import get_auth_session_factory
         from app.models.session import Session as SessionModel
-        from sqlalchemy import select
-        from datetime import UTC, datetime
 
         factory = get_auth_session_factory()
         async with factory() as db:
@@ -254,9 +255,10 @@ async def invalidate_session(redis: aioredis.Redis, session_id: str) -> None:
     await redis.delete(f"session:{session_id}")
     # Also invalidate in PostgreSQL fallback
     try:
+        from sqlalchemy import delete
+
         from app.core.db import get_session_factory
         from app.models.session import SessionModel
-        from sqlalchemy import delete
         factory = get_session_factory()
         async with factory() as db:
             await db.execute(

app/core/db/__init__.py

@@ -224,7 +224,7 @@ async def get_db() -> AsyncGenerator[AsyncSession, None]:
     Used for normal API requests with tenant context set via RLS.
     Includes retry logic for transient connection errors.
     """
-    from app.core.resilience import get_circuit, retry_db, _is_transient_db_error
+    from app.core.resilience import _is_transient_db_error, get_circuit, retry_db
 
     async def _get_session():
         factory = get_session_factory()

app/core/delegation_token.py

@@ -18,7 +18,6 @@ from typing import Any
 
 from app.config import get_settings
 
-
 DELEGATION_AUDIENCE = "internal-ai-delegation"
 MAX_TOKEN_LIFETIME = 60  # seconds
 

app/core/error_codes.py

@@ -16,11 +16,11 @@ Every API error response follows the schema:
 
 from __future__ import annotations
 
-import enum
+from enum import StrEnum
 from typing import Any
 
 
-class ErrorCategory(str, enum.Enum):
+class ErrorCategory(StrEnum):
     """Error classification for retry decisions."""
 
     TRANSIENT = "transient"   # retryable: timeout, rate-limit, connection

app/core/history_hooks.py

@@ -31,9 +31,14 @@ def register_history_hooks(
     after_create_hook: str,
     after_update_hook: str,
     after_delete_hook: str,
+    owner_tag: str | None = None,
 ) -> None:
     """Register standard history-recording hooks for an entity type.
 
+    Args:
+        owner_tag: Plugin name that owns these hooks. Used for targeted
+            deregistration in on_deactivate() via unregister_actions_by_owner().
+
     Each hook receives kwargs: db, tenant_id, user_id, and either:
     - after_create: snapshot_after (the created entity dict)
     - after_update: snapshot_before, snapshot_after, changes
@@ -99,9 +104,9 @@ def register_history_hooks(
             action="delete", snapshot_before=snapshot_before,
         )
 
-    reg.register_action(after_create_hook, _on_create, priority=90)
+    reg.register_action(after_create_hook, _on_create, priority=90, owner_tag=owner_tag)
-    reg.register_action(after_update_hook, _on_update, priority=90)
+    reg.register_action(after_update_hook, _on_update, priority=90, owner_tag=owner_tag)
-    reg.register_action(after_delete_hook, _on_delete, priority=90)
+    reg.register_action(after_delete_hook, _on_delete, priority=90, owner_tag=owner_tag)
     logger.debug("History hooks registered for: %s", entity_type)
 
 
@@ -121,56 +126,16 @@ def _extract_entity_id(snapshot: dict[str, Any] | None) -> uuid.UUID | None:
 
 
 def register_default_history_hooks() -> None:
-    """Register history hooks for all built-in entity types.
+    """Register history hooks for Core entity types only.
 
     Called during app startup after the hook registry is initialized.
-    Plugin entities should register their own hooks in on_activate().
+    Plugin entities (task, calendar_entry, dms_file, mail) register
+    their own hooks in on_activate(). See P0-8 fix.
     """
-    reg = get_hook_registry()
+    # Contact hooks are registered by ContactsPlugin.on_activate() with
-
+    # owner_tag="contacts" — do not register them here to avoid double
-    # Contact (already has manual record_history calls in contact_service.py,
+    # registration. This function remains for future Core entities that
-    # but registering hooks ensures consistency for any code path that fires
+    # have no plugin.
-    # the hooks without calling record_history directly)
-    register_history_hooks(
-        reg, "contact",
-        "contact.after_create",
-        "contact.after_update",
-        "contact.after_delete",
-    )
-
-    # Task plugin
-    register_history_hooks(
-        reg, "task",
-        "task.after_create",
-        "task.after_update",
-        "task.after_delete",
-    )
-
-    # Calendar plugin — CalendarEntry
-    register_history_hooks(
-        reg, "calendar_entry",
-        "calendar_entry.after_create",
-        "calendar_entry.after_update",
-        "calendar_entry.after_delete",
-    )
-
-    # DMS plugin — File metadata
-    register_history_hooks(
-        reg, "dms_file",
-        "dms_file.after_create",
-        "dms_file.after_update",
-        "dms_file.after_delete",
-    )
-
-    # Mail plugin
-    register_history_hooks(
-        reg, "mail",
-        "mail.after_create",
-        "mail.after_update",
-        "mail.after_delete",
-    )
-
-    logger.info("Default history hooks registered for: contact, task, calendar_entry, dms_file, mail")
 
 
 def reset_history_hooks_for_testing() -> None:

app/core/hooks.py

@@ -30,7 +30,8 @@ from __future__ import annotations
 
 import logging
 from collections import defaultdict
-from typing import Any, Callable
+from collections.abc import Callable
+from typing import Any
 
 logger = logging.getLogger(__name__)
 
@@ -55,27 +56,32 @@ class HookRegistry:
 
     # ─── Registration ───
 
-    def register_action(self, hook_name: str, callback: Callable, priority: int = 10) -> None:
+    def register_action(self, hook_name: str, callback: Callable, priority: int = 10, owner_tag: str | None = None) -> None:
-        """Register an action callback for *hook_name*."""
+        """Register an action callback for *hook_name*.
-        self._actions[hook_name].append((priority, callback))
-        self._actions[hook_name].sort(key=lambda x: x[0])
-        logger.debug("Action registered: %s (priority=%d)", hook_name, priority)
 
-    def register_filter(self, hook_name: str, callback: Callable, priority: int = 10) -> None:
+        Args:
+            owner_tag: Optional tag identifying the owning plugin. Used by
+                unregister_actions_by_owner() to remove only this plugin's hooks.
+        """
+        self._actions[hook_name].append((priority, callback, owner_tag))
+        self._actions[hook_name].sort(key=lambda x: x[0])
+        logger.debug("Action registered: %s (priority=%d, owner=%s)", hook_name, priority, owner_tag)
+
+    def register_filter(self, hook_name: str, callback: Callable, priority: int = 10, owner_tag: str | None = None) -> None:
         """Register a filter callback for *hook_name*."""
-        self._filters[hook_name].append((priority, callback))
+        self._filters[hook_name].append((priority, callback, owner_tag))
         self._filters[hook_name].sort(key=lambda x: x[0])
-        logger.debug("Filter registered: %s (priority=%d)", hook_name, priority)
+        logger.debug("Filter registered: %s (priority=%d, owner=%s)", hook_name, priority, owner_tag)
 
     # ─── Unregistration ───
 
     def unregister(self, hook_name: str, callback: Callable) -> None:
         """Remove a specific callback from both actions and filters."""
         self._actions[hook_name] = [
-            (p, c) for p, c in self._actions.get(hook_name, []) if c != callback
+            (p, c, o) for p, c, o in self._actions.get(hook_name, []) if c != callback
         ]
         self._filters[hook_name] = [
-            (p, c) for p, c in self._filters.get(hook_name, []) if c != callback
+            (p, c, o) for p, c, o in self._filters.get(hook_name, []) if c != callback
         ]
         if not self._actions[hook_name]:
             self._actions.pop(hook_name, None)
@@ -92,23 +98,47 @@ class HookRegistry:
         for hook_dict in (self._actions, self._filters):
             for hook_name in list(hook_dict.keys()):
                 kept: list[tuple[int, Callable]] = []
-                for priority, callback in hook_dict[hook_name]:
+                for priority, callback, _owner in hook_dict[hook_name]:
                     owner = getattr(callback, "__self__", None)
                     plugin_manifest_name = getattr(getattr(owner, "manifest", None), "name", None)
                     if plugin_manifest_name == plugin_name:
                         logger.debug("Unregistered hook %s for plugin %s", hook_name, plugin_name)
                         continue
-                    kept.append((priority, callback))
+                    kept.append((priority, callback, _owner))
                 if kept:
                     hook_dict[hook_name] = kept
                 else:
                     hook_dict.pop(hook_name, None)
 
+    def clear_actions(self, hook_name: str) -> None:
+        """Remove all action callbacks for a given hook name.
+
+        Used by plugins to unregister hooks that were registered via
+        register_history_hooks() (which creates free functions, not bound methods).
+        """
+        self._actions.pop(hook_name, None)
+        logger.debug("Cleared all actions for hook: %s", hook_name)
+
+    def unregister_actions_by_owner(self, hook_name: str, owner_tag: str) -> None:
+        """Remove only the action callbacks for *hook_name* that were registered
+        with the given *owner_tag*.
+
+        This prevents a plugin from accidentally removing another plugin's
+        handlers for the same event.
+        """
+        callbacks = self._actions.get(hook_name, [])
+        kept = [(p, c, o) for p, c, o in callbacks if o != owner_tag]
+        if kept:
+            self._actions[hook_name] = kept
+        else:
+            self._actions.pop(hook_name, None)
+        logger.debug("Unregistered %d actions for hook %s owner=%s", len(callbacks) - len(kept), hook_name, owner_tag)
+
     # ─── Execution ───
 
     async def do_action(self, hook_name: str, *args: Any, **kwargs: Any) -> None:
         """Execute all action callbacks for *hook_name* in priority order."""
-        for _, callback in self._actions.get(hook_name, []):
+        for _, callback, _owner in self._actions.get(hook_name, []):
             try:
                 result = callback(*args, **kwargs)
                 if hasattr(result, "__await__"):
@@ -118,7 +148,7 @@ class HookRegistry:
 
     async def apply_filters(self, hook_name: str, value: Any, *args: Any, **kwargs: Any) -> Any:
         """Pass *value* through all filter callbacks for *hook_name* in priority order."""
-        for _, callback in self._filters.get(hook_name, []):
+        for _, callback, _owner in self._filters.get(hook_name, []):
             try:
                 result = callback(value, *args, **kwargs)
                 if hasattr(result, "__await__"):

app/core/job_registry.py

@@ -9,7 +9,8 @@ importing from plugin modules directly.
 from __future__ import annotations
 
 import logging
-from typing import Any, Callable, Coroutine
+from collections.abc import Callable, Coroutine
+from typing import Any
 
 logger = logging.getLogger(__name__)
 

app/core/jobs.py

@@ -6,7 +6,7 @@ import logging
 from typing import Any
 
 from arq import create_pool
-from arq.connections import RedisSettings, ArqRedis
+from arq.connections import ArqRedis, RedisSettings
 
 from app.config import get_settings
 
@@ -97,9 +97,10 @@ async def send_password_reset_email(
     This is an ARQ worker function. It is registered with the job registry
     so the worker can execute it when the auth service enqueues it.
     """
-    import aiosmtplib
-    from email.mime.text import MIMEText
     from email.mime.multipart import MIMEMultipart
+    from email.mime.text import MIMEText
+
+    import aiosmtplib
 
     settings = get_settings()
 

app/core/middleware.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import json
 import logging
 
 from fastapi import Request, status

app/core/notifications.py

@@ -12,13 +12,11 @@ import uuid
 from datetime import UTC
 from typing import Any
 
-from sqlalchemy import and_, func, select, update
+from sqlalchemy import func, select, update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.notification import (
     Notification,
-    NotificationPreference,
-    NotificationType,
 )
 
 logger = logging.getLogger(__name__)
@@ -37,11 +35,15 @@ async def post_system_message(
 ):
     """Post a typed system message to the tenant system channel.
 
-    Delegates to kommunikation.services.post_system_message.
+    Delegates to kommunikation plugin via contract registry. Returns None
-    Returns the created CommMessage, or None if the user has muted this type.
+    if the kommunikation plugin is not active (graceful degradation).
     """
-    from app.plugins.builtins.kommunikation.services import post_system_message as _post
+    from app.plugins.builtins.contracts import get_contract
-    return await _post(
+    komm_contract = get_contract("kommunikation")
+    if komm_contract is None:
+        logger.warning("kommunikation plugin not available — system message not posted")
+        return None
+    return await komm_contract.post_system_message(
         db, tenant_id, user_id, message_type, title, body,
         entity_type, entity_id, severity,
     )

app/core/outbox.py

@@ -27,7 +27,7 @@ from __future__ import annotations
 
 import logging
 import uuid
-from datetime import datetime, timedelta, timezone
+from datetime import UTC, datetime, timedelta
 from typing import Any
 
 import redis.asyncio as aioredis
@@ -318,7 +318,7 @@ async def _process_single_outbox_event(
             already_succeeded = {row[0] for row in succeeded_q}
 
         # Filter out handlers that already succeeded (per-handler idempotency)
-        pending_handlers = [(h, name) for h, name in zip(handlers, handler_names) if name not in already_succeeded]
+        pending_handlers = [(h, name) for h, name in zip(handlers, handler_names, strict=False) if name not in already_succeeded]
         pending_names = [name for _, name in pending_handlers]
         pending_callables = [h for h, _ in pending_handlers]
 
@@ -345,7 +345,7 @@ async def _process_single_outbox_event(
                         "status": "delivered",
                         "attempt_count": current_attempt,
                         "last_error": None,
-                        "processed_at": datetime.now(timezone.utc),
+                        "processed_at": datetime.now(UTC),
                     },
                 )
                 # Per-handler consumer_inbox for idempotency
@@ -408,7 +408,7 @@ async def _process_single_outbox_event(
             )
         else:
             backoff = timedelta(seconds=(2 ** new_attempts) * 10)
-            next_retry = datetime.now(timezone.utc) + backoff
+            next_retry = datetime.now(UTC) + backoff
             await db.execute(
                 _RETRY_SQL,
                 {

app/core/pagination.py

@@ -7,8 +7,9 @@ Provides:
 from __future__ import annotations
 
 import uuid
-from typing import Any, TypeVar, Sequence
+from typing import Any, TypeVar
-from sqlalchemy import select, func, text
+
+from sqlalchemy import func, select, text
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.sql import Select
 

app/core/permission_registry.py

@@ -18,9 +18,6 @@ logger = logging.getLogger(__name__)
 
 # ── Core system permissions ──
 CORE_PERMISSIONS: list[dict[str, str]] = [
-    {"key": "contacts:read", "label": "Contacts: Read", "category": "core", "module": "contacts"},
-    {"key": "contacts:write", "label": "Contacts: Write", "category": "core", "module": "contacts"},
-    {"key": "contacts:delete", "label": "Contacts: Delete", "category": "core", "module": "contacts"},
     {"key": "users:read", "label": "Users: Read", "category": "core", "module": "users"},
     {"key": "users:write", "label": "Users: Write", "category": "core", "module": "users"},
     {"key": "users:delete", "label": "Users: Delete", "category": "core", "module": "users"},
@@ -66,66 +63,10 @@ CORE_PERMISSIONS: list[dict[str, str]] = [
     {"key": "workspaces:assign_users", "label": "Workspaces: Assign Users", "category": "core", "module": "workspaces"},
     {"key": "workspaces:configure_modules", "label": "Workspaces: Configure Modules", "category": "core", "module": "workspaces"},
     {"key": "system:admin", "label": "System: Admin (cross-tenant)", "category": "system", "module": "system"},
-    # ── Plugin permissions (registered at startup, but also listed here for completeness) ──
+    # NOTE: Plugin permissions (calendar, dms, mail, tasks, comm, automation, ai,
-    {"key": "ai:read", "label": "AI: Read", "category": "core", "module": "ai"},
+    # tags, entity_links, reports, search, mcp, permissions, agents, dashboard)
-    {"key": "ai:write", "label": "AI: Write", "category": "core", "module": "ai"},
+    # are registered dynamically via register_plugin_permissions() from plugin
-    {"key": "ai:agents", "label": "AI: Agents", "category": "core", "module": "ai"},
+    # manifests at activation time. They are NOT hardcoded here (P0-4 fix).
-    {"key": "ai:config", "label": "AI: Config", "category": "core", "module": "ai"},
-    {"key": "ai_proactive:read", "label": "AI Proactive: Read", "category": "core", "module": "ai_proactive"},
-    {"key": "ai_proactive:write", "label": "AI Proactive: Write", "category": "core", "module": "ai_proactive"},
-    {"key": "ai_proactive:config", "label": "AI Proactive: Config", "category": "core", "module": "ai_proactive"},
-    {"key": "agents:read", "label": "Agents: Read", "category": "core", "module": "agents"},
-    {"key": "agents:write", "label": "Agents: Write", "category": "core", "module": "agents"},
-    {"key": "agents:delete", "label": "Agents: Delete", "category": "core", "module": "agents"},
-    {"key": "agents:execute", "label": "Agents: Execute", "category": "core", "module": "agents"},
-    {"key": "automation:read", "label": "Automation: Read", "category": "core", "module": "automation"},
-    {"key": "automation:write", "label": "Automation: Write", "category": "core", "module": "automation"},
-    {"key": "automation:delete", "label": "Automation: Delete", "category": "core", "module": "automation"},
-    {"key": "automation:execute", "label": "Automation: Execute", "category": "core", "module": "automation"},
-    {"key": "automation:admin", "label": "Automation: Admin", "category": "core", "module": "automation"},
-    {"key": "automation:configure", "label": "Automation: Configure", "category": "core", "module": "automation"},
-    {"key": "calendar:read", "label": "Calendar: Read", "category": "core", "module": "calendar"},
-    {"key": "calendar:write", "label": "Calendar: Write", "category": "core", "module": "calendar"},
-    {"key": "calendar:delete", "label": "Calendar: Delete", "category": "core", "module": "calendar"},
-    {"key": "calendar:share", "label": "Calendar: Share", "category": "core", "module": "calendar"},
-    {"key": "comm:read", "label": "Comm: Read", "category": "core", "module": "comm"},
-    {"key": "comm:write", "label": "Comm: Write", "category": "core", "module": "comm"},
-    {"key": "comm:delete", "label": "Comm: Delete", "category": "core", "module": "comm"},
-    {"key": "comm:manage", "label": "Comm: Manage", "category": "core", "module": "comm"},
-    {"key": "dashboard:read", "label": "Dashboard: Read", "category": "core", "module": "dashboard"},
-    {"key": "dms:read", "label": "DMS: Read", "category": "core", "module": "dms"},
-    {"key": "dms:write", "label": "DMS: Write", "category": "core", "module": "dms"},
-    {"key": "dms:delete", "label": "DMS: Delete", "category": "core", "module": "dms"},
-    {"key": "dms:share", "label": "DMS: Share", "category": "core", "module": "dms"},
-    {"key": "entity_links:read", "label": "Entity Links: Read", "category": "core", "module": "entity_links"},
-    {"key": "entity_links:write", "label": "Entity Links: Write", "category": "core", "module": "entity_links"},
-    {"key": "entity_links:delete", "label": "Entity Links: Delete", "category": "core", "module": "entity_links"},
-    {"key": "mail:read", "label": "Mail: Read", "category": "core", "module": "mail"},
-    {"key": "mail:write", "label": "Mail: Write", "category": "core", "module": "mail"},
-    {"key": "mail:delete", "label": "Mail: Delete", "category": "core", "module": "mail"},
-    {"key": "mail:send", "label": "Mail: Send", "category": "core", "module": "mail"},
-    {"key": "mail:share", "label": "Mail: Share", "category": "core", "module": "mail"},
-    {"key": "mail:config", "label": "Mail: Config", "category": "core", "module": "mail"},
-    {"key": "mcp:read", "label": "MCP: Read", "category": "core", "module": "mcp"},
-    {"key": "mcp:write", "label": "MCP: Write", "category": "core", "module": "mcp"},
-    {"key": "permissions:admin", "label": "Permissions: Admin", "category": "core", "module": "permissions"},
-    {"key": "permissions:delegations:read", "label": "Permissions: Delegations: Read", "category": "core", "module": "permissions"},
-    {"key": "permissions:delegations:write", "label": "Permissions: Delegations: Write", "category": "core", "module": "permissions"},
-    {"key": "permissions:policies:read", "label": "Permissions: Policies: Read", "category": "core", "module": "permissions"},
-    {"key": "permissions:policies:write", "label": "Permissions: Policies: Write", "category": "core", "module": "permissions"},
-    {"key": "permissions:templates:read", "label": "Permissions: Templates: Read", "category": "core", "module": "permissions"},
-    {"key": "permissions:templates:write", "label": "Permissions: Templates: Write", "category": "core", "module": "permissions"},
-    {"key": "reports:read", "label": "Reports: Read", "category": "core", "module": "reports"},
-    {"key": "reports:generate", "label": "Reports: Generate", "category": "core", "module": "reports"},
-    {"key": "reports:manage_templates", "label": "Reports: Manage Templates", "category": "core", "module": "reports"},
-    {"key": "search:read", "label": "Search: Read", "category": "core", "module": "search"},
-    {"key": "search:admin", "label": "Search: Admin", "category": "core", "module": "search"},
-    {"key": "tags:read", "label": "Tags: Read", "category": "core", "module": "tags"},
-    {"key": "tags:write", "label": "Tags: Write", "category": "core", "module": "tags"},
-    {"key": "tags:delete", "label": "Tags: Delete", "category": "core", "module": "tags"},
-    {"key": "tasks:read", "label": "Tasks: Read", "category": "core", "module": "tasks"},
-    {"key": "tasks:write", "label": "Tasks: Write", "category": "core", "module": "tasks"},
-    {"key": "tasks:delete", "label": "Tasks: Delete", "category": "core", "module": "tasks"},
 ]
 
 

app/core/permissions.py

@@ -16,11 +16,9 @@ import uuid
 from typing import Any
 
 import redis.asyncio as aioredis
-from sqlalchemy import select, func
+from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.config import get_settings
-from app.core.auth import get_redis
 from app.models.group import Group, UserGroup
 from app.models.role import Role
 from app.models.tenant import Tenant

app/core/plugin_error_handler.py

@@ -1,9 +1,12 @@
 """Plugin error isolation wrapper."""
-import logging
 import functools
 import inspect
-from fastapi import UploadFile  # noqa: F401 — needed for ForwardRef resolution
+import logging
-from fastapi import WebSocket  # noqa: F401 — needed for ForwardRef resolution
+
+from fastapi import (
+    UploadFile,  # noqa: F401 — needed for ForwardRef resolution
+    WebSocket,  # noqa: F401 — needed for ForwardRef resolution
+)
 from fastapi.responses import JSONResponse
 
 logger = logging.getLogger(__name__)

app/core/resilience.py

@@ -137,7 +137,7 @@ def _is_transient_db_error(exc: Exception) -> bool:
     if isinstance(exc, _DB_RETRYABLE_EXC):
         return True
     try:
-        from sqlalchemy.exc import OperationalError, DBAPIError
+        from sqlalchemy.exc import DBAPIError, OperationalError
         if isinstance(exc, OperationalError):
             return True
         if isinstance(exc, DBAPIError):
@@ -162,7 +162,6 @@ async def retry_db(
     base_delay: float = 0.1,
     **kwargs: Any,
 ) -> T:
-    last_exc: Exception | None = None
     for attempt in range(max_retries):
         try:
             result = await func(*args, **kwargs)
@@ -170,7 +169,6 @@ async def retry_db(
                 logger.info("DB operation succeeded on retry %d", attempt + 1)
             return result
         except Exception as exc:
-            last_exc = exc
             if not _is_transient_db_error(exc):
                 raise
             if attempt < max_retries - 1:

app/core/restore_registry.py

@@ -13,8 +13,9 @@ entity types can be restored, and only through their declared configuration.
 from __future__ import annotations
 
 import logging
+from collections.abc import Awaitable, Callable
 from dataclasses import dataclass, field
-from typing import Any, Awaitable, Callable
+from typing import Any
 
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -72,6 +73,12 @@ class RestoreRegistry:
         self._configs[config.entity_type] = config
         logger.debug("Registered restore config for: %s", config.entity_type)
 
+    def unregister(self, entity_type: str) -> None:
+        """Remove a RestoreConfig (e.g. when plugin is deactivated)."""
+        if entity_type in self._configs:
+            del self._configs[entity_type]
+            logger.debug("Unregistered restore config for: %s", entity_type)
+
     def get(self, entity_type: str) -> RestoreConfig | None:
         """Get RestoreConfig for entity_type, or None if not registered."""
         return self._configs.get(entity_type)
@@ -105,176 +112,14 @@ def reset_restore_registry_for_testing() -> RestoreRegistry:
 
 
 def register_default_entities() -> None:
-    """Register all built-in entity types for restore.
+    """Register Core entity types for restore.
 
-    Called during app startup. Plugin entities should register themselves
+    Called during app startup. Plugin entities register themselves
     in their on_activate() lifecycle hook.
     """
-    from app.models.contact import Contact
+    # Contact is registered by ContactsPlugin.on_activate() — do not register
+    # it here to avoid double registration. This function remains for future
+    # Core entities that have no plugin.
 
-    reg = get_restore_registry()
+    # Plugin entities (task, calendar_entry, dms_file, mail) are registered
-
+    # by their respective plugins in on_activate(). See P0-7 fix.
-    # Contact (covers both 'person' and 'company' types — same model)
-    reg.register(RestoreConfig(
-        entity_type="contact",
-        model_class=Contact,
-        restore_permission="contacts:write",
-        excluded_fields=frozenset({
-            "search_tsv",
-            "embedding",
-            "default_person_id",
-            "admin_contactperson_id",
-        }),
-    ))
-
-    # Task plugin
-    try:
-        from app.plugins.builtins.tasks.models import Task
-        reg.register(RestoreConfig(
-            entity_type="task",
-            model_class=Task,
-            restore_permission="tasks:write",
-            excluded_fields=frozenset({
-                "created_by",
-                "assigned_to",
-                "contact_id",
-            }),
-        ))
-    except ImportError:
-        logger.debug("Tasks plugin model not available for restore registration")
-
-    # Calendar plugin — CalendarEntry
-    try:
-        from app.plugins.builtins.calendar.models import CalendarEntry
-        reg.register(RestoreConfig(
-            entity_type="calendar_entry",
-            model_class=CalendarEntry,
-            restore_permission="calendar:write",
-            excluded_fields=frozenset({
-                "calendar_id",
-                "created_by",
-                "assigned_to",
-                "source_mail_id",
-            }),
-        ))
-    except ImportError:
-        logger.debug("Calendar plugin model not available for restore registration")
-
-    # DMS plugin — File metadata
-    try:
-        from app.plugins.builtins.dms.models import File as DmsFile
-        reg.register(RestoreConfig(
-            entity_type="dms_file",
-            model_class=DmsFile,
-            restore_permission="dms:write",
-            excluded_fields=frozenset({
-                "storage_path",
-                "content_hash",
-                "size_bytes",
-                "uploaded_by",
-                "folder_id",
-            }),
-        ))
-    except ImportError:
-        logger.debug("DMS plugin model not available for restore registration")
-
-    # Mail plugin — special handler for IMAP semantics
-    try:
-        from app.plugins.builtins.mail.models import Mail
-        reg.register(RestoreConfig(
-            entity_type="mail",
-            model_class=Mail,
-            restore_permission="mail:write",
-            excluded_fields=frozenset({
-                "message_id",
-                "rfc822_size",
-                "raw_path",
-                "account_id",
-                "folder_id",
-            }),
-            special_handler=_mail_restore_handler,
-        ))
-    except ImportError:
-        logger.debug("Mail plugin model not available for restore registration")
-
-
-async def _mail_restore_handler(
-    db: AsyncSession,
-    entity: Any,
-    action: str,
-    snapshot: dict[str, Any],
-    context: dict[str, Any],
-) -> dict[str, Any]:
-    """Special restore handler for Mail entities.
-
-    Mail restore has IMAP semantics:
-    - delete: move back from trash to original folder (if folder still exists)
-    - update: revert metadata fields
-    - create: soft-delete (undo send only works for drafts)
-
-    Server errors must not produce false local status.
-    """
-    import uuid
-    from datetime import datetime, timezone
-    from sqlalchemy import select
-
-    user_id = context.get("user_id")
-    tenant_id = context.get("tenant_id")
-
-    if action == "delete":
-        # Un-delete: clear deleted_at, restore original folder_id if available
-        if entity is None:
-            raise ValueError("Mail entity not found for restore")
-        entity.deleted_at = None
-        if user_id:
-            entity.updated_by = user_id if hasattr(entity, "updated_by") else None
-        # Restore original folder from snapshot if available
-        original_folder_id = snapshot.get("folder_id")
-        if original_folder_id and hasattr(entity, "folder_id"):
-            try:
-                folder_uuid = uuid.UUID(str(original_folder_id))
-                # Verify folder still exists and is not deleted
-                from app.plugins.builtins.mail.models import MailFolder
-                folder_q = select(MailFolder).where(
-                    MailFolder.id == folder_uuid,
-                    MailFolder.tenant_id == tenant_id,
-                    MailFolder.deleted_at.is_(None),
-                )
-                folder_result = await db.execute(folder_q)
-                folder = folder_result.scalar_one_or_none()
-                if folder:
-                    entity.folder_id = folder_uuid
-                else:
-                    logger.warning(
-                        "Original mail folder %s no longer exists, "
-                        "restoring mail without folder assignment",
-                        original_folder_id,
-                    )
-            except (ValueError, Exception) as e:
-                logger.warning("Failed to restore mail folder: %s", e)
-
-        await db.flush()
-        return {"id": str(entity.id), "restored": True, "entity_type": "mail"}
-
-    elif action == "update":
-        if entity is None:
-            raise ValueError("Mail entity not found for restore")
-        # Revert metadata fields from snapshot_before
-        excluded = _DEFAULT_EXCLUDED | {
-            "message_id", "rfc822_size", "raw_path", "account_id", "folder_id",
-        }
-        for key, value in snapshot.items():
-            if hasattr(entity, key) and key not in excluded:
-                setattr(entity, key, value)
-        await db.flush()
-        return {"id": str(entity.id), "restored": True, "entity_type": "mail"}
-
-    elif action == "create":
-        # Undo creation: soft-delete (only meaningful for drafts)
-        if entity is None:
-            raise ValueError("Mail entity not found for restore")
-        entity.deleted_at = datetime.now(timezone.utc)
-        await db.flush()
-        return {"id": str(entity.id), "restored": True, "entity_type": "mail", "note": "soft-deleted (undo create)"}
-
-    raise ValueError(f"Unsupported action for mail restore: {action}")

app/core/storage.py

@@ -22,7 +22,8 @@ import mimetypes
 import os
 import tempfile
 from abc import ABC, abstractmethod
-from typing import Any, AsyncIterator
+from collections.abc import AsyncIterator
+from typing import Any
 
 import aiofiles
 
@@ -145,13 +146,13 @@ class LocalStorage(StorageBackend):
 
     async def delete(self, path: str) -> bool:
         full_path = self._full_path(path)
-        if os.path.exists(full_path):
+        if os.path.exists(full_path):  # noqa: ASYNC240
             os.remove(full_path)
             return True
         return False
 
     async def exists(self, path: str) -> bool:
-        return os.path.exists(self._full_path(path))
+        return os.path.exists(self._full_path(path))  # noqa: ASYNC240
 
     async def get_url(self, path: str, expires: int = 3600) -> str:
         """Return a relative URL path for the file (not the filesystem path)."""
@@ -160,12 +161,12 @@ class LocalStorage(StorageBackend):
 
     async def list_files(self, prefix: str) -> list[str]:
         full_prefix = self._full_path(prefix)
-        if not os.path.isdir(full_prefix):
+        if not os.path.isdir(full_prefix):  # noqa: ASYNC240
             return []
         result: list[str] = []
-        for root, _dirs, files in os.walk(full_prefix):
+        for root, _dirs, files in os.walk(full_prefix):  # noqa: ASYNC240
             for fname in files:
-                rel = os.path.relpath(os.path.join(root, fname), self.base_path)
+                rel = os.path.relpath(os.path.join(root, fname), self.base_path)  # noqa: ASYNC240
                 result.append(rel)
         return result
 
@@ -295,7 +296,7 @@ class S3Storage(StorageBackend):
             logger.debug("S3Storage: streamed %s (%d bytes)", path, total)
             return total
         finally:
-            if os.path.exists(tmp_path):
+            if os.path.exists(tmp_path):  # noqa: ASYNC240
                 try:
                     os.remove(tmp_path)
                 except OSError:

app/core/trigger_dispatcher.py

@@ -113,7 +113,12 @@ class TriggerDispatcher:
     ) -> None:
         """Query DB for active automations matching *event_name* and dispatch."""
         from app.core.db import get_session_factory
-        from app.plugins.builtins.automation.models import AutomationDefinition
+        from app.plugins.builtins.contracts import get_contract
+        automation_contract = get_contract("automation")
+        AutomationDefinition = automation_contract.Automation  # noqa: N806
+        if automation_contract is None:
+            logger.debug("Automation plugin not available — trigger skipped")
+            return
 
         factory = get_session_factory()
         tenant_id = payload.get("tenant_id")
@@ -171,15 +176,16 @@ class TriggerDispatcher:
         For production workloads with back-pressure, the caller may
         alternatively enqueue via ``enqueue_job``.
         """
-        from app.plugins.builtins.automation.execution_engine import run_automation
-
         try:
-            await run_automation(
+            from app.plugins.builtins.contracts import get_contract
-                ctx={},
+            automation_contract = get_contract("automation")
-                automation_id=automation_id,
+            if automation_contract is not None:
-                trigger_type=trigger_type,
+                await automation_contract.run_automation(
-                trigger_data=trigger_data,
+                    ctx={},
-            )
+                    automation_id=automation_id,
+                    trigger_type=trigger_type,
+                    trigger_data=trigger_data,
+                )
         except Exception:
             logger.exception(
                 "TriggerDispatcher: run_automation failed for automation_id=%s",

app/core/visibility.py

@@ -6,7 +6,7 @@ Defense-in-Depth layer.
 
 Usage:
     from app.core.visibility import apply_visibility_filter
-    
+
     @router.get("/contacts")
     async def list_contacts(db, current_user):
         query = select(Contact).where(Contact.tenant_id == tenant_id)
@@ -29,17 +29,17 @@ import logging
 import uuid
 from typing import Any
 
-from sqlalchemy import and_, exists, not_, or_, select, text
+from sqlalchemy import and_, not_, or_, select, text
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 
 from app.models.entity_permission import EntityPermission
 from app.models.group import UserGroup
-from app.models.user import User, UserTenant
+from app.models.user import UserTenant
 
 logger = logging.getLogger(__name__)
 
-from app.core.permissions import PERM_RANK as _PERM_RANK
+from app.core.permissions import PERM_RANK as _PERM_RANK  # noqa: E402
 
 
 def _rank(level: str) -> int:

app/core/webhook_dispatcher.py

@@ -8,9 +8,8 @@ import uuid
 from typing import Any
 
 from sqlalchemy import select
-from sqlalchemy.ext.asyncio import async_sessionmaker
 
-from app.core.db import get_engine, get_session_factory
+from app.core.db import get_session_factory
 from app.core.event_bus import EventBus, get_event_bus
 from app.models.webhook import Webhook
 from app.services.webhook_service import send_webhook

app/core/worker.py

@@ -6,8 +6,8 @@ import logging
 import traceback
 from typing import Any
 
-from arq.connections import RedisSettings
 from arq import cron
+from arq.connections import RedisSettings
 
 from app.config import get_settings
 from app.core.job_registry import get_all_jobs, get_job, register_job
@@ -97,12 +97,12 @@ async def on_startup(ctx: dict[str, Any]) -> None:
     await container.initialize()
 
     # Initialize plugin registry and discover built-in plugins
-    from app.plugins.registry import get_registry
+    from sqlalchemy import select as sa_select
+
     from app.core.event_bus import get_event_bus
     from app.core.webhook_dispatcher import register_webhook_event_handlers
-    from sqlalchemy import select as sa_select
     from app.models.plugin import Plugin as PluginModel
-    from sqlalchemy.ext.asyncio import async_sessionmaker
+    from app.plugins.registry import get_registry
 
     registry = get_registry()
     from app.core.db import get_migration_engine
@@ -120,7 +120,6 @@ async def on_startup(ctx: dict[str, Any]) -> None:
     # are registered by the API container's startup. The worker only
     # needs event handlers and job processing.
     from app.models.tenant import Tenant as TenantModel
-    from app.core.db import set_tenant_context
 
     async with async_session() as db:
         # Load all tenant IDs for per-tenant event handler registration
@@ -134,7 +133,7 @@ async def on_startup(ctx: dict[str, Any]) -> None:
     async with async_session() as db:
         # Global plugins that are marked active
         result = await db.execute(
-            sa_select(PluginModel.name).where(PluginModel.active == True)
+            sa_select(PluginModel.name).where(PluginModel.active.is_(True))
         )
         active_plugin_names = {row[0] for row in result}
         logger.info(f"Worker: {len(active_plugin_names)} active plugins: {active_plugin_names}")
@@ -166,11 +165,20 @@ async def on_startup(ctx: dict[str, Any]) -> None:
 
     # Register search providers (normally done by app startup)
     try:
-        from app.plugins.builtins.unified_search.provider_registry import auto_register_providers
+        from app.plugins.builtins.contracts import get_contract
-        factory = async_session
+        search_contract = get_contract("unified_search")
-        async with factory() as db:
+        if search_contract is not None:
-            await auto_register_providers(db)
+            factory = async_session
-        logger.info("Search providers registered for worker")
+            async with factory() as db:
+                # auto_register_providers is not exposed via contract yet;
+                # use the contract's get_search_registry to access providers
+                from app.plugins.builtins.unified_search.provider_registry import (
+                    auto_register_providers,
+                )
+                await auto_register_providers(db)
+            logger.info("Search providers registered for worker")
+        else:
+            logger.debug("Unified search plugin not available — skipping provider registration")
     except Exception:
         logger.warning("Failed to register search providers in worker", exc_info=True)
 
@@ -185,8 +193,9 @@ async def on_shutdown(ctx: dict[str, Any]) -> None:
 
     # Pause running workflow instances so they can be resumed after restart
     try:
-        from app.core.db import get_worker_session_factory
         from sqlalchemy import select as sa_select
+
+        from app.core.db import get_worker_session_factory
         from app.models.workflow import WorkflowInstance
 
         session_factory = get_worker_session_factory()
@@ -215,19 +224,26 @@ async def on_shutdown(ctx: dict[str, Any]) -> None:
 # from plugin internals.
 # ---------------------------------------------------------------------------
 def _lazy_register_plugin_jobs() -> None:
-    """Import each plugin job module so its register_job() call fires."""
+    """Import each plugin job module so its register_job() call fires.
-    plugin_job_modules = [
+
-        "app.core.jobs",
+    Dynamically discovers job modules from all registered plugins via
-        "app.plugins.builtins.unified_search.jobs",
+    get_job_modules() — no hardcoded plugin list (P0-5 fix).
-        "app.plugins.builtins.ai_proactive.jobs",
+    """
-        "app.plugins.builtins.automation.scheduler",
+    from app.plugins.registry import get_registry
-        "app.plugins.builtins.automation.workflow_timeout",
+    registry = get_registry()
-        "app.plugins.builtins.automation.agent_runner",
+
-        "app.plugins.builtins.automation.execution_engine",
+    # Ensure builtins are discovered
-        "app.plugins.builtins.tasks.jobs",
+    if not registry.list_discovered():
-        "app.services.import_export_jobs",
+        registry.discover_builtins()
-    ]
+
-    for mod_name in plugin_job_modules:
+    job_modules: list[str] = ["app.core.jobs", "app.services.import_export_jobs"]
+    for plugin_name in registry.list_discovered():
+        plugin = registry.get_plugin(plugin_name)
+        if plugin is None:
+            continue
+        job_modules.extend(plugin.get_job_modules())
+
+    for mod_name in job_modules:
         try:
             import importlib
             importlib.import_module(mod_name)
@@ -251,9 +267,10 @@ async def process_outbox_job(ctx: dict[str, Any]) -> None:
 
     Processes events per-tenant by setting tenant context for RLS.
     """
+    from sqlalchemy import text as sa_text
+
     from app.core.db import get_worker_session_factory
     from app.core.outbox import process_outbox_batch
-    from sqlalchemy import text as sa_text
 
     factory = get_worker_session_factory()
     async with factory() as db:
@@ -268,14 +285,16 @@ async def process_outbox_job(ctx: dict[str, Any]) -> None:
         except Exception as exc:
             logger.error("Outbox processing failed", exc_info=True)
             await db.rollback()
-            # Report to Forgejo
+            # Report to Forgejo via contract (avoid Core→Plugin direct import)
             try:
-                from app.plugins.builtins.forgejo_error_reporter.service import report_error_to_forgejo
+                from app.plugins.builtins.contracts import get_contract
-                await report_error_to_forgejo({
+                reporter_contract = get_contract("forgejo_error_reporter")
-                    "message": f"[Worker] Outbox processing failed: {exc}",
+                if reporter_contract is not None:
-                    "stack": traceback.format_exc(),
+                    await reporter_contract.report_error_to_forgejo({
-                    "context": {"source": "worker_outbox_job"},
+                        "message": f"[Worker] Outbox processing failed: {exc}",
-                })
+                        "stack": traceback.format_exc(),
+                        "context": {"source": "worker_outbox_job"},
+                    })
             except Exception:
                 pass
 
@@ -292,9 +311,10 @@ async def cleanup_outbox_job(ctx: dict[str, Any]) -> None:
     Runs hourly to prevent the outbox table from growing indefinitely.
     Iterates per-tenant for RLS compliance.
     """
+    from sqlalchemy import text as sa_text
+
     from app.core.db import get_worker_session_factory
     from app.core.outbox import cleanup_published_events
-    from sqlalchemy import text as sa_text
 
     factory = get_worker_session_factory()
     async with factory() as db:

app/core/ws_helpers.py

@@ -6,14 +6,15 @@ import asyncio
 import json
 import logging
 import uuid
-from typing import Any, Callable
+from collections.abc import Callable
+from typing import Any
 
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from starlette.websockets import WebSocket
 
-from app.core.auth import get_redis, get_session_data, verify_ws_origin
 from app.config import get_settings
+from app.core.auth import get_redis, get_session_data, verify_ws_origin
 
 logger = logging.getLogger(__name__)
 
@@ -167,7 +168,7 @@ async def drain_all_connections(grace_period_seconds: float = 5.0) -> None:
     """
     total_connections = 0
     for registry in _global_ws_registries:
-        for user_id, conns in list(registry.items()):
+        for _user_id, conns in list(registry.items()):
             for ws in list(conns):
                 try:
                     await ws.send_text(json.dumps({
@@ -186,7 +187,7 @@ async def drain_all_connections(grace_period_seconds: float = 5.0) -> None:
 
     # Close all connections
     for registry in _global_ws_registries:
-        for user_id, conns in list(registry.items()):
+        for _user_id, conns in list(registry.items()):
             for ws in list(conns):
                 try:
                     await ws.close(code=1001, reason="Server shutting down")

app/core/ws_pubsub.py

@@ -6,7 +6,7 @@ import asyncio
 import json
 import logging
 import uuid
-from typing import Awaitable, Callable
+from collections.abc import Awaitable, Callable
 
 from app.core.auth import get_redis
 

app/deps.py

@@ -14,13 +14,12 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.config import get_settings
 from app.core.auth import get_redis, get_session_data, refresh_session_ttl
 from app.core.db import get_db, set_tenant_context, set_user_context
+
 logger = logging.getLogger(__name__)
 
 # Known write-permission modules — used by require_write() to check
 # specific permissions instead of broad wildcards like *:write
 _WRITE_PERMISSIONS = [
-    "contacts:write",
-    "contacts:create",
     "users:write",
     "roles:write",
     "audit:write",
@@ -401,10 +400,12 @@ def require_active_plugin(plugin_name: str):
                 return
 
             # Per-tenant activation check with Redis cache
-            from app.core.redis import get_redis
-            from sqlalchemy import text
             import json
 
+            from sqlalchemy import text
+
+            from app.core.redis import get_redis
+
             redis = get_redis()
             if redis is not None:
                 cache_key = f"plugin-activation:{tenant_id}:{plugin_name}"
@@ -454,7 +455,7 @@ def require_active_plugin(plugin_name: str):
             logger.error("Plugin activation check failed for '%s': %s", plugin_name, exc)
             raise HTTPException(
                 status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
-                detail={"detail": f"Plugin activation check failed", "code": "plugin_check_error"},
+                detail={"detail": "Plugin activation check failed", "code": "plugin_check_error"},
-            )
+            ) from exc
 
     return _check

app/main.py

@@ -3,80 +3,77 @@
 from __future__ import annotations
 
 import asyncio
+import importlib
+import logging
+import os
 import time
 import traceback
 import uuid as _uuid
 from contextlib import asynccontextmanager
 
 import structlog
-from fastapi import FastAPI, HTTPException, Request, Depends, APIRouter
+from fastapi import Depends, FastAPI, HTTPException, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 from starlette.middleware.base import BaseHTTPMiddleware
-from starlette.routing import WebSocketRoute
-import importlib
-import logging
-import os
 
 logger = logging.getLogger(__name__)
 
-from app.config import get_settings
+from app.config import get_settings  # noqa: E402
-from app.core.db import close_engine, get_engine
+from app.core.db import close_engine, get_engine  # noqa: E402
-from app.core.error_codes import ApiError, ErrorCategory, classify_exception, build_error_response
+from app.core.error_codes import ApiError, build_error_response  # noqa: E402
-from app.core.middleware import CSRFMiddleware, SecurityHeadersMiddleware
+from app.core.middleware import CSRFMiddleware, SecurityHeadersMiddleware  # noqa: E402
-from app.core.rate_limit import GeneralRateLimitMiddleware
+from app.core.monitoring import record_error, record_request  # noqa: E402
-from app.core.resilience import CircuitBreakerMiddleware
+from app.core.rate_limit import GeneralRateLimitMiddleware  # noqa: E402
-from app.core.monitoring import record_error, record_request
+from app.core.resilience import CircuitBreakerMiddleware  # noqa: E402
-from app.core.plugin_error_handler import wrap_plugin_route
+from app.core.service_container import get_container  # noqa: E402
-from app.core.service_container import get_container
+from app.plugins.registry import get_registry  # noqa: E402
-from app.plugins.registry import get_registry
+from app.routes import (  # noqa: E402
-from app.routes import (
     addresses,
-    bank_accounts,
     ai_copilot,
+    api_tokens,
+    attachments,
     audit,
     auth,
-    errors,
+    backups,
-    contact_folders,
+    bank_accounts,
     contact_folder_permissions,
-    entity_permissions,
+    contact_folders,
     contacts,
+    currencies,
+    custom_field_definitions,
+    custom_fields,
     dashboard,
     entity_history,
+    entity_permissions,
+    errors,
     groups,
+    guests,
     health,
     import_export,
     metrics,
     notifications,
-    plugins,
+    outbox,
-    roles,
-    tenants,
-    users,
-    user_preferences,
-    workflows,
-    currencies,
-    taxes,
-    sequences,
-    system_settings,
-    attachments,
-    custom_field_definitions,
-    custom_fields,
-    saved_filters,
-    workspaces,
-    saved_views,
-    webhooks,
-    backups,
     owner_transfer,
     permission_templates,
+    plugins,
     # delegations,  # ⏸ Parked — not integrated into resolve_permissions()
     policies,
-    guests,
+    roles,
-    outbox,
+    saved_filters,
-    api_tokens,
+    saved_views,
+    sequences,
+    system_settings,
+    taxes,
+    tenants,
+    user_preferences,
+    users,
+    webhooks,
+    workflows,
+    workspaces,
 )
 
-
 # ── Graceful shutdown signal ─────────────────────────────────────────────────
 # Set during lifespan shutdown so middleware and handlers can stop accepting work.
 _shutdown_event = asyncio.Event()
@@ -148,13 +145,15 @@ class RequestLoggingMiddleware(BaseHTTPMiddleware):
             )
             # Report to Forgejo error reporter
             try:
-                from app.plugins.builtins.forgejo_error_reporter.service import report_error_to_forgejo
+                from app.plugins.builtins.contracts import get_contract
-                await report_error_to_forgejo({
+                reporter_contract = get_contract("forgejo_error_reporter")
-                    "message": f"[Backend] {method} {path}: {exc}",
+                if reporter_contract is not None:
-                    "stack": tb_str,
+                    await reporter_contract.report_error_to_forgejo({
-                    "url": str(request.url),
+                        "message": f"[Backend] {method} {path}: {exc}",
-                    "context": {"method": method, "path": path, "source": "backend_middleware", "trace_id": trace_id},
+                        "stack": tb_str,
-                })
+                        "url": str(request.url),
+                        "context": {"method": method, "path": path, "source": "backend_middleware", "trace_id": trace_id},
+                    })
             except Exception:
                 pass  # Never let error reporting break the request
             raise
@@ -168,12 +167,14 @@ class RequestLoggingMiddleware(BaseHTTPMiddleware):
         # Report 4xx and 5xx errors to Forgejo (except 401/403 which are expected)
         if status_code >= 400 and status_code not in (401, 403):
             try:
-                from app.plugins.builtins.forgejo_error_reporter.service import report_error_to_forgejo
+                from app.plugins.builtins.contracts import get_contract
-                await report_error_to_forgejo({
+                reporter_contract = get_contract("forgejo_error_reporter")
-                    "message": f"[Backend] {method} {path} → {status_code}",
+                if reporter_contract is not None:
-                    "url": str(request.url),
+                    await reporter_contract.report_error_to_forgejo({
-                    "context": {"method": method, "path": path, "status": status_code, "source": "backend_response", "trace_id": trace_id},
+                        "message": f"[Backend] {method} {path} → {status_code}",
-                })
+                        "url": str(request.url),
+                        "context": {"method": method, "path": path, "status": status_code, "source": "backend_response", "trace_id": trace_id},
+                    })
             except Exception:
                 pass  # Never let error reporting break the response
 
@@ -197,8 +198,8 @@ class RequestLoggingMiddleware(BaseHTTPMiddleware):
 async def lifespan(app: FastAPI):
     """Application lifespan: startup and shutdown."""
     # Initialize global Redis client (singleton)
-    from app.core.auth import init_redis, close_redis
+    from app.core.auth import close_redis, init_redis
-    from app.core.jobs import init_job_pool, close_job_pool
+    from app.core.jobs import close_job_pool, init_job_pool
 
     await init_redis()
     await init_job_pool()
@@ -216,15 +217,16 @@ async def lifespan(app: FastAPI):
     # Install discovered builtin plugins and activate only those marked active in DB
     from sqlalchemy import select as sa_select
     from sqlalchemy.ext.asyncio import async_sessionmaker
-    from app.models.plugin import Plugin as PluginModel
+
     from app.core.event_bus import get_event_bus
+    from app.models.plugin import Plugin as PluginModel
 
     event_bus = get_event_bus()
     async_session = async_sessionmaker(get_engine(), expire_on_commit=False)
 
     # Load all tenant IDs for per-tenant plugin activation (RLS fail-closed requires tenant context)
-    from app.models.tenant import Tenant as TenantModel
     from app.core.db import set_tenant_context
+    from app.models.tenant import Tenant as TenantModel
 
     async with async_session() as db:
         tenant_result = await db.execute(sa_select(TenantModel.id))
@@ -333,15 +335,17 @@ async def lifespan(app: FastAPI):
     register_trigger_dispatcher(event_bus)
     logger.info("Trigger dispatcher registered")
 
-    # Register entity restore configurations (Phase D — Undo/Restore)
+    # Entity restore + history hooks are registered by plugins in on_activate(),
-    from app.core.restore_registry import register_default_entities
+    # including Contacts (via ContactsPlugin). No Core special case here.
-    register_default_entities()
-    logger.info("Entity restore registry initialized")
 
-    # Register hook-based history recording (Phase D — Undo/Restore)
+    # Register entity models from active plugins (P0-3 fix)
-    from app.core.history_hooks import register_default_history_hooks
+    from app.services.entity_permission_service import register_entity_model
-    register_default_history_hooks()
+    for name in active_plugin_names:
-    logger.info("History hooks registered")
+        plugin = registry.get_plugin(name)
+        if plugin:
+            for entity_type, model_class in plugin.get_entity_models().items():
+                register_entity_model(entity_type, model_class)
+    logger.info("Entity models registered for %d active plugins", len(active_plugin_names))
 
     # Register field definitions from active plugins only
     from app.core.permission_registry import get_permission_registry
@@ -356,8 +360,8 @@ async def lifespan(app: FastAPI):
     # Seed default data (EUR currency, 19%/7% tax rates) for all tenants
     # ⚠️ Use migration engine (crm_migration, BYPASSRLS) — RLS on currencies/taxes
     # blocks inserts from crm_api role without tenant context.
-    from app.core.seeds import seed_default_data
     from app.core.db import get_migration_session_factory
+    from app.core.seeds import seed_default_data
 
     mig_session_factory = get_migration_session_factory()
     async with mig_session_factory() as db:
@@ -386,7 +390,7 @@ async def lifespan(app: FastAPI):
     # Give in-flight requests time to complete (max 30s)
     try:
         await asyncio.wait_for(_drain_inflight(), timeout=30.0)
-    except asyncio.TimeoutError:
+    except TimeoutError:
         logger.warning("Graceful shutdown: 30s timeout reached, forcing shutdown")
 
     # Close global Redis and ARQ pool
@@ -575,63 +579,41 @@ def create_app() -> FastAPI:
     app.include_router(outbox.router)
     app.include_router(api_tokens.router)
 
-    # ── Register plugin routes for all built-in plugins ──
+    # ── Register plugin routes for all discovered plugins ──
     # Routes are registered at app creation time so OpenAPI docs are complete.
     # Activation status is enforced per-request via require_active_plugin().
-    import importlib
+    # Plugin modules are discovered dynamically via the registry — no hardcoded list.
     from app.deps import require_active_plugin
-    # Discover all built-in plugin modules and register their routes
+    from app.plugins.registry import get_registry
-    plugin_modules = [
+    _route_registry = get_registry()
-        "app.plugins.builtins.tags",
+    # Ensure builtins are discovered before registering routes.
-        "app.plugins.builtins.permissions",
+    # discover_builtins() is idempotent — safe to call even if lifespan hasn't run yet.
-        "app.plugins.builtins.entity_links",
+    if not _route_registry.list_discovered():
-        "app.plugins.builtins.dms",
+        _route_registry.discover_builtins()
-        "app.plugins.builtins.calendar",
+    for plugin_name in _route_registry.list_discovered():
-        "app.plugins.builtins.mail",
+        plugin = _route_registry.get_plugin(plugin_name)
-        "app.plugins.builtins.report_generator",
+        if plugin is None or not plugin.manifest.routes:
-        "app.plugins.builtins.kommunikation",
+            continue
-        "app.plugins.builtins.tasks",
-        "app.plugins.builtins.automation",
-        "app.plugins.builtins.ai_assistant",
-        "app.plugins.builtins.ai_proactive",
-        "app.plugins.builtins.ai_ui_control",
-        "app.plugins.builtins.mcp_client",
-        "app.plugins.builtins.mcp_server",
-        "app.plugins.builtins.system_notif",
-        "app.plugins.builtins.unified_search",
-        "app.plugins.builtins.forgejo_error_reporter",
-        "app.plugins.builtins.agent_memory",
-        "app.plugins.builtins.graph_rag",
-        "app.plugins.builtins.marketplace",
-    ]
-    for mod_name in plugin_modules:
         try:
-            mod = importlib.import_module(mod_name)
+            for route_def in plugin.manifest.routes:
-            # Find the plugin class and get its manifest routes
+                try:
-            for attr_name in dir(mod):
+                    router_module = importlib.import_module(route_def.module)
-                attr = getattr(mod, attr_name)
+                    router = getattr(router_module, route_def.router_attr)
-                if isinstance(attr, type) and hasattr(attr, "manifest") and hasattr(attr.manifest, "routes"):
+                    # Check if this route definition is public (no auth required)
-                    plugin_name = getattr(attr.manifest, "name", mod_name.split(".")[-1])
+                    is_public = getattr(route_def, "is_public", False)
-                    for route_def in attr.manifest.routes:
+                    if is_public:
-                        try:
+                        # Public routes: no auth dependency, no plugin check
-                            router_module = importlib.import_module(route_def.module)
+                        app.include_router(router)
-                            router = getattr(router_module, route_def.router_attr)
+                        logger.info(f"Registered PUBLIC routes for {plugin_name}: {route_def.module}")
-                            # Check if this route definition is public (no auth required)
+                        continue
-                            is_public = getattr(route_def, "is_public", False)
+                    plugin_dep = Depends(require_active_plugin(plugin_name))
-                            if is_public:
+                    # Use include_router with dependencies to avoid mutating
-                                # Public routes: no auth dependency, no plugin check
+                    # the shared module-level router object (which tests reuse)
-                                app.include_router(router)
+                    app.include_router(router, dependencies=[plugin_dep])
-                                logger.info(f"Registered PUBLIC routes for {plugin_name}: {route_def.module}")
+                except Exception as exc:
-                                continue
+                    logger.error(f"Failed to register route {route_def.module}.{route_def.router_attr}: {exc}")
-                            plugin_dep = Depends(require_active_plugin(plugin_name))
-                            # Use include_router with dependencies to avoid mutating
-                            # the shared module-level router object (which tests reuse)
-                            app.include_router(router, dependencies=[plugin_dep])
-                        except Exception as exc:
-                            logger.error(f"Failed to register route {route_def.module}.{route_def.router_attr}: {exc}")
-                    break
         except Exception as exc:
-            logger.error(f"Failed to register plugin routes for {mod_name}: {exc}")
+            logger.error(f"Failed to register plugin routes for {plugin_name}: {exc}")
 
     # ── Serve frontend static files (SPA) ──────────────────────────────
     # Mount built frontend assets (JS, CSS, images)
@@ -654,7 +636,7 @@ def create_app() -> FastAPI:
             if full_path.startswith(blocked_prefixes) or ".." in full_path:
                 raise HTTPException(status_code=404, detail="Not Found")
             index_path = os.path.join(frontend_dist, "index.html")
-            if os.path.isfile(index_path):
+            if os.path.isfile(index_path):  # noqa: ASYNC240
                 return FileResponse(index_path)
             raise HTTPException(status_code=404, detail="Frontend not built")
 

app/models/__init__.py

@@ -1,38 +1,37 @@
 """SQLAlchemy models for LeoCRM."""
 
 from app.models.address import Address
-from app.models.bank_account import BankAccount
 from app.models.ai_conversation import AIConversation, AIMessage
 from app.models.attachment import Attachment
 from app.models.audit import AuditLog
 from app.models.auth import ApiToken, PasswordResetToken
+from app.models.backup import Backup
+from app.models.bank_account import BankAccount
+from app.models.consumer_inbox import ConsumerInbox
 from app.models.contact import Contact, ContactPerson
 from app.models.contact_folder import ContactFolder
 from app.models.contact_merge import ContactMergeHistory
-from app.models.entity_permission import EntityPermission
-from app.models.consumer_inbox import ConsumerInbox
-from app.models.outbox_delivery import OutboxDelivery
-from app.models.entity_policy import EntityPolicy
-from app.models.permission_template import PermissionTemplate
-from app.models.permission_delegation import PermissionDelegation
-from app.models.owned_mixin import OwnedMixin
-from app.models.entity_history import EntityHistory
 from app.models.currency import Currency
+from app.models.custom_field_definition import CustomFieldDefinition
+from app.models.entity_history import EntityHistory
+from app.models.entity_permission import EntityPermission
+from app.models.entity_policy import EntityPolicy
 from app.models.group import Group, UserGroup
 from app.models.notification import Notification, NotificationPreference, NotificationType
+from app.models.owned_mixin import OwnedMixin
+from app.models.permission_delegation import PermissionDelegation
+from app.models.permission_template import PermissionTemplate
 from app.models.plugin import Plugin, PluginMigration
 from app.models.role import Role
+from app.models.saved_view import SavedView
 from app.models.sequence import Sequence
 from app.models.session import Session
 from app.models.system_settings import SystemSettings
 from app.models.tax import TaxRate
 from app.models.tenant import Tenant
 from app.models.user import User, UserTenant
-from app.models.backup import Backup
-from app.models.custom_field_definition import CustomFieldDefinition
 from app.models.webhook import Webhook
 from app.models.workflow import Workflow, WorkflowInstance, WorkflowStepHistory
-from app.models.saved_view import SavedView
 
 __all__ = [
     "Tenant",
@@ -79,4 +78,9 @@ __all__ = [
     "SavedView",
 ]
 from app.models.entity_attachment import EntityAttachment  # noqa: F401
-from app.models.workspace import Workspace, WorkspaceModule, WorkspaceUser, WorkspaceWidget  # noqa: F401
+from app.models.workspace import (  # noqa: F401
+    Workspace,
+    WorkspaceModule,
+    WorkspaceUser,
+    WorkspaceWidget,
+)

app/models/ai_conversation.py

@@ -11,7 +11,6 @@ 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 AIConversation(Base, TenantMixin):

app/models/attachment.py

@@ -3,9 +3,8 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, Index, Integer, String
+from sqlalchemy import ForeignKey, Index, Integer, String
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 

app/models/audit.py

@@ -19,7 +19,6 @@ from app.core.db import Base, TenantMixin
 
 # Re-export EntityHistory as DeletionLog for backward compatibility.
 # Tests import DeletionLog from app.models.audit and use entity_snapshot attribute.
-from app.models.entity_history import EntityHistory as DeletionLog
 
 
 class AuditLog(Base, TenantMixin):

app/models/contact.py

@@ -13,16 +13,15 @@ from typing import Any
 
 from sqlalchemy import (
     Computed,
+    Float,
     ForeignKey,
     Index,
     Numeric,
     String,
     Text,
-    Float,
     UniqueConstraint,
 )
-from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.dialects.postgresql import JSONB, TSVECTOR
-from sqlalchemy.dialects.postgresql import TSVECTOR
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 

app/models/contact_folder.py

@@ -7,9 +7,8 @@ for manual ordering via drag & drop.
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, Index, Integer, String, func
+from sqlalchemy import ForeignKey, Index, Integer, String
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 

app/models/custom_field_definition.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import uuid
 from typing import Any
 
-from sqlalchemy import Boolean, Integer, JSON, String, UniqueConstraint
+from sqlalchemy import JSON, Boolean, Integer, String, UniqueConstraint
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 

app/models/entity_attachment.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import uuid
 from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, Index, String
+from sqlalchemy import DateTime, ForeignKey, Index, String, text
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -15,7 +15,7 @@ from app.models.owned_mixin import OwnedMixin
 
 class EntityAttachment(Base, TenantMixin, OwnedMixin):
     """Links a DMS file to any entity (contact, address, invoice, etc.).
-    
+
     The actual file is stored in the DMS (files table).
     This table only holds the reference + category + display_name.
     """
@@ -42,10 +42,10 @@ class EntityAttachment(Base, TenantMixin, OwnedMixin):
         PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
     )
     created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), nullable=False, server_default=__import__('sqlalchemy').func.now()
+        DateTime(timezone=True), nullable=False, server_default=text('now()')
     )
     updated_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), nullable=False, server_default=__import__('sqlalchemy').func.now(),
+        DateTime(timezone=True), nullable=False, server_default=text('now()'),
-        onupdate=__import__('sqlalchemy').func.now(),
+        onupdate=text('now()'),
     )
     deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

app/models/entity_permission.py

@@ -23,7 +23,6 @@ import uuid
 from datetime import datetime
 
 from sqlalchemy import (
-    Boolean,
     CheckConstraint,
     DateTime,
     ForeignKey,

app/models/entity_policy.py

@@ -30,10 +30,10 @@ from sqlalchemy import (
     Index,
     Integer,
     String,
-    Text,
     func,
 )
-from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin

app/models/group.py

@@ -6,7 +6,7 @@ import uuid
 from datetime import datetime
 from typing import Any
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, UniqueConstraint, func
+from sqlalchemy import DateTime, ForeignKey, Integer, String, UniqueConstraint, func
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column

app/models/notification.py

@@ -19,7 +19,6 @@ 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 Notification(Base, TenantMixin):

app/models/owned_mixin.py

@@ -15,7 +15,7 @@ from __future__ import annotations
 
 import uuid
 
-from sqlalchemy import ForeignKey, Index
+from sqlalchemy import ForeignKey
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 

app/models/permission_delegation.py

@@ -14,10 +14,10 @@ from sqlalchemy import (
     CheckConstraint,
     DateTime,
     ForeignKey,
-    String,
     func,
 )
-from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin

app/models/permission_template.py

@@ -15,7 +15,8 @@ from sqlalchemy import (
     String,
     func,
 )
-from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin

app/models/plugin_allowlist.py

@@ -3,9 +3,8 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text, func
+from sqlalchemy import Boolean, ForeignKey, String, Text
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 

app/models/role.py

@@ -7,7 +7,6 @@ from datetime import datetime
 from typing import Any
 
 from sqlalchemy import DateTime, Integer, String, func
-from sqlalchemy import Boolean
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column

app/models/sequence.py

@@ -3,9 +3,8 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 
-from sqlalchemy import DateTime, Index, Integer, String
+from sqlalchemy import Index, Integer, String
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 

app/models/system_settings.py

@@ -3,9 +3,8 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, Index, Integer, String
+from sqlalchemy import ForeignKey, Index, Integer, String
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column

app/models/tax.py

@@ -3,10 +3,9 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 from decimal import Decimal
 
-from sqlalchemy import Boolean, DateTime, Index, Numeric, String
+from sqlalchemy import Boolean, Index, Numeric, String
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 

app/models/webhook.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import uuid
 
-from sqlalchemy import Boolean, Integer, JSON, String
+from sqlalchemy import JSON, Boolean, Integer, String
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 

app/plugins/base.py

@@ -97,6 +97,29 @@ class BasePlugin(ABC):
         """
         return []
 
+    # ─── Job Modules ───
+
+    def get_job_modules(self) -> list[str]:
+        """Return list of ARQ job module paths to import for background workers.
+
+        Override in subclasses that register background jobs. The worker
+        imports each module so that register_job() calls fire.
+        Default: no job modules.
+        """
+        return []
+
+    # ─── Entity Models ───
+
+    def get_entity_models(self) -> dict[str, type]:
+        """Return entity_type → SQLAlchemy model class mapping for permission system.
+
+        Override in subclasses that own entities with OwnedMixin.
+        These models are registered in ENTITY_MODELS at activation time
+        so the permission system can resolve entity types dynamically.
+        Default: no entity models.
+        """
+        return {}
+
     # ─── Field Definitions ───
 
     def get_field_definitions(self) -> list[dict[str, str]]:

app/plugins/builtins/__init__.py

@@ -1,21 +1,9 @@
 """Built-in plugins directory.
 
 Each module in this package that exports a BasePlugin subclass will be
-discovered automatically by the plugin registry on application startup.
+discovered automatically by the plugin registry on application startup
+via pkgutil.iter_modules — no manual imports needed here.
 
-Subdirectory plugins (tags, permissions, entity_links, mail) export their plugin
+Subdirectory plugins (tags, permissions, entity_links, mail, etc.) export
-class via __init__.py so the registry can discover them as packages.
+their plugin class via __init__.py so the registry can discover them as packages.
 """
-
-from app.plugins.builtins.agent_memory import AgentMemoryPlugin
-from app.plugins.builtins.calendar import CalendarPlugin
-from app.plugins.builtins.dms import DmsPlugin
-from app.plugins.builtins.entity_links import EntityLinksPlugin
-from app.plugins.builtins.graph_rag import GraphRAGPlugin
-from app.plugins.builtins.mail import MailPlugin
-from app.plugins.builtins.report_generator import ReportGeneratorPlugin
-from app.plugins.builtins.permissions import PermissionsPlugin
-from app.plugins.builtins.tags import TagsPlugin
-from app.plugins.builtins.marketplace import MarketplacePlugin
-
-__all__ = ["AgentMemoryPlugin", "TagsPlugin", "PermissionsPlugin", "EntityLinksPlugin", "DmsPlugin", "CalendarPlugin", "MailPlugin", "ReportGeneratorPlugin", "GraphRAGPlugin", "MarketplacePlugin"]

app/plugins/builtins/agent_memory/plugin.py

@@ -34,6 +34,10 @@ class AgentMemoryPlugin(BasePlugin):
         contract_version="1.0.0",
     )
 
+    def get_entity_models(self) -> dict[str, type]:
+        from app.plugins.builtins.agent_memory.models import AgentMemory
+        return {"agent_memory": AgentMemory}
+
     async def on_deactivate(self, db, service_container, event_bus) -> None:
         """Deactivate plugin: unregister contract and event listeners."""
         from app.plugins.builtins.contracts import get_contract_registry

app/plugins/builtins/agent_memory/routes.py

@@ -13,7 +13,6 @@ from app.deps import get_current_user, require_permission
 from app.plugins.builtins.agent_memory.models import AgentMemory
 from app.plugins.builtins.agent_memory.schemas import (
     AgentMemoryCreate,
-    AgentMemoryRead,
     AgentMemoryUpdate,
 )
 from app.plugins.builtins.agent_memory.services import (

app/plugins/builtins/agent_memory/services.py

@@ -5,7 +5,8 @@ from __future__ import annotations
 import uuid
 from typing import Any
 
-from sqlalchemy import select, text as sql_text
+from sqlalchemy import select
+from sqlalchemy import text as sql_text
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.plugins.builtins.agent_memory.models import AgentMemory

app/plugins/builtins/ai_assistant/crm_api_tool.py

@@ -9,14 +9,9 @@ from __future__ import annotations
 
 import json
 import logging
-import uuid
 from typing import Any
 
 import httpx
-from sqlalchemy.ext.asyncio import AsyncSession
-
-from app.config import get_settings
-from app.core.db import get_session_factory
 
 logger = logging.getLogger(__name__)
 

app/plugins/builtins/ai_assistant/external_api.py

@@ -11,7 +11,7 @@ import logging
 import uuid
 from typing import Any
 
-from fastapi import APIRouter, Depends, HTTPException, Query, Request
+from fastapi import APIRouter, Depends, HTTPException, Request
 from fastapi.responses import StreamingResponse
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -61,7 +61,7 @@ async def run_agent_external(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     # Find the agent
     from app.plugins.builtins.ai_assistant.models import AIAgent
@@ -79,8 +79,8 @@ async def run_agent_external(
         raise HTTPException(status_code=400, detail="Agent is not active")
 
     # Create or find a session for this external interaction
-    from app.plugins.builtins.ai_assistant.models import AIChatSession, AIChatMessage
+
-    from datetime import datetime, timezone
+    from app.plugins.builtins.ai_assistant.models import AIChatMessage, AIChatSession
 
     session = AIChatSession(
         user_id=uuid.UUID(current_user["user_id"]),
@@ -168,7 +168,7 @@ async def get_agent_status_external(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     from app.plugins.builtins.ai_assistant.models import AIAgent
 
@@ -183,9 +183,10 @@ async def get_agent_status_external(
         raise HTTPException(status_code=404, detail="Agent not found")
 
     # Get recent run stats
-    from app.plugins.builtins.automation.contracts import AutomationContract
     from sqlalchemy import func
 
+    from app.plugins.builtins.automation.contracts import AutomationContract
+
     recent_runs = await db.execute(
         select(func.count())
         .select_from(AutomationContract.AgentRun)
@@ -232,7 +233,7 @@ async def stream_agent_external(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     from app.plugins.builtins.ai_assistant.models import AIAgent
 

app/plugins/builtins/ai_assistant/models.py

@@ -3,11 +3,9 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 
 from sqlalchemy import (
     Boolean,
-    DateTime,
     Float,
     ForeignKey,
     Index,
@@ -15,13 +13,13 @@ from sqlalchemy import (
     String,
     Text,
 )
-from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
+from sqlalchemy.dialects.postgresql import JSONB
+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
 
-
 # --- Providers ---
 
 class AIProvider(Base, TenantMixin):

app/plugins/builtins/ai_assistant/plugin.py

@@ -6,7 +6,13 @@ import logging
 from typing import Any
 
 from app.plugins.base import BasePlugin
-from app.plugins.manifest import PluginManifest, PluginRouteDef, FrontendMenuItem, FrontendPageRoute, FrontendSettingsPage
+from app.plugins.manifest import (
+    FrontendMenuItem,
+    FrontendPageRoute,
+    FrontendSettingsPage,
+    PluginManifest,
+    PluginRouteDef,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -71,6 +77,10 @@ class AIAssistantPlugin(BasePlugin):
 
         await seed_defaults(db)
 
+    def get_entity_models(self) -> dict[str, type]:
+        from app.plugins.builtins.ai_assistant.models import AIAgent, AIChatSession
+        return {"ai_agent": AIAgent, "ai_chat_session": AIChatSession}
+
     async def on_activate(self, db, service_container, event_bus) -> None:
         """Activate plugin: register CRM API tool and participant handler."""
         await super().on_activate(db, service_container, event_bus)

app/plugins/builtins/ai_assistant/routes.py

@@ -33,10 +33,8 @@ from app.plugins.builtins.ai_assistant.schemas import (
     AIPresetUpdate,
     AIProviderCreate,
     AIProviderUpdate,
-    ChatAttachmentResponse,
     ChatFolderCreate,
     ChatFolderUpdate,
-    ChatFolderResponse,
     ChatSendRequest,
     ChatSessionCreate,
     ChatSessionUpdate,
@@ -92,7 +90,7 @@ async def create_provider(
         existing = await db.execute(
             select(AIProvider)
             .where(AIProvider.tenant_id == tenant_id)
-            .where(AIProvider.is_default == True)
+            .where(AIProvider.is_default.is_(True))
         )
         for p in existing.scalars().all():
             p.is_default = False
@@ -129,7 +127,7 @@ async def update_provider(
         existing = await db.execute(
             select(AIProvider)
             .where(AIProvider.tenant_id == tenant_id)
-            .where(AIProvider.is_default == True)
+            .where(AIProvider.is_default.is_(True))
             .where(AIProvider.id != provider.id)
         )
         for p in existing.scalars().all():
@@ -717,8 +715,8 @@ async def delete_folder(
 
 # ─── Attachments ───
 
-import os
+import os  # noqa: E402
-from pathlib import Path
+from pathlib import Path  # noqa: E402
 
 ATTACHMENT_DIR = Path(os.environ.get("STORAGE_PATH", "/data/storage")) / "ai_attachments"
 MAX_ATTACHMENT_SIZE = 25 * 1024 * 1024  # 25MB

app/plugins/builtins/ai_assistant/schemas.py

@@ -7,7 +7,6 @@ from typing import Any
 
 from pydantic import BaseModel, ConfigDict, Field
 
-
 # ─── Providers ───
 
 class AIProviderCreate(BaseModel):

app/plugins/builtins/ai_assistant/services.py

@@ -10,16 +10,15 @@ from __future__ import annotations
 import json
 import logging
 import uuid
-from typing import Any, AsyncGenerator
+from collections.abc import AsyncGenerator
+from typing import Any
 
 import aiofiles
-
 import litellm
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.ai.llm_client import llm_complete
-
 from app.core.permissions import check_permission
 from app.plugins.builtins.ai_assistant.models import (
     AIAgent,
@@ -169,7 +168,7 @@ async def get_default_provider(db: AsyncSession, tenant_id: uuid.UUID) -> AIProv
     result = await db.execute(
         select(AIProvider)
         .where(AIProvider.tenant_id == tenant_id)
-        .where(AIProvider.is_default == True)
+        .where(AIProvider.is_default.is_(True))
         .limit(1)
     )
     return result.scalar_one_or_none()
@@ -209,7 +208,7 @@ async def get_default_agent(db: AsyncSession, tenant_id: uuid.UUID) -> AIAgent |
     result = await db.execute(
         select(AIAgent)
         .where(AIAgent.tenant_id == tenant_id)
-        .where(AIAgent.is_default == True)
+        .where(AIAgent.is_default.is_(True))
         .limit(1)
     )
     return result.scalar_one_or_none()
@@ -394,8 +393,9 @@ async def _extract_attachment_content(
                 text_content = content.decode("utf-8", errors="replace")
             elif mime == "application/pdf" or att.filename.endswith(".pdf"):
                 try:
-                    from pypdf import PdfReader
                     from io import BytesIO
+
+                    from pypdf import PdfReader
                     reader = PdfReader(BytesIO(content))
                     text_content = "\n".join(page.extract_text() or "" for page in reader.pages)
                 except ImportError:

app/plugins/builtins/ai_assistant/tool_registry.py

@@ -8,8 +8,8 @@ and an async handler. Tools can optionally require specific RBAC permissions.
 from __future__ import annotations
 
 import logging
-from dataclasses import dataclass, field
+from dataclasses import dataclass
-from typing import Any, Awaitable, Callable, Protocol
+from typing import Any, Protocol
 
 logger = logging.getLogger(__name__)
 

app/plugins/builtins/ai_proactive/context_tools.py

@@ -12,12 +12,10 @@ import logging
 import uuid
 from typing import Any
 
-from sqlalchemy import select, text
+from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.core.db import create_db_session
 from app.models.audit import AuditLog
-from app.models.contact import Contact
 from app.plugins.builtins.mail.contracts import Mail
 
 logger = logging.getLogger(__name__)
@@ -101,7 +99,9 @@ async def search_related_handler(arguments: dict[str, Any], context: dict[str, A
         entity_id = uuid.UUID(arguments["entity_id"])
         limit = arguments.get("limit", 5)
 
-        from app.plugins.builtins.unified_search.contracts import get_contract as get_search_contract
+        from app.plugins.builtins.unified_search.contracts import (
+            get_contract as get_search_contract,
+        )
         _search = get_search_contract()
         find_similar_all_types = _search.find_similar_all_types
 
@@ -165,8 +165,8 @@ async def get_open_tasks_handler(arguments: dict[str, Any], context: dict[str, A
 
         from app.plugins.builtins.calendar.contracts import get_contract as get_calendar_contract
         _cal = get_calendar_contract()
-        CalendarEntry = _cal.CalendarEntry
+        calendar_entry = _cal.calendar_entry
-        CalendarEntryLink = _cal.CalendarEntryLink
+        calendar_entry_link = _cal.calendar_entry_link
 
         db, tenant_id, _ = await _get_db_and_tenant(context)
         entity_type = arguments["entity_type"]
@@ -174,14 +174,14 @@ async def get_open_tasks_handler(arguments: dict[str, Any], context: dict[str, A
         now = datetime.now(UTC)
 
         result = await db.execute(
-            select(CalendarEntry)
+            select(calendar_entry)
-            .join(CalendarEntryLink, CalendarEntryLink.entry_id == CalendarEntry.id)
+            .join(calendar_entry_link, calendar_entry_link.entry_id == calendar_entry.id)
-            .where(CalendarEntryLink.entity_type == entity_type)
+            .where(calendar_entry_link.entity_type == entity_type)
-            .where(CalendarEntryLink.entity_id == entity_id)
+            .where(calendar_entry_link.entity_id == entity_id)
-            .where(CalendarEntry.tenant_id == tenant_id)
+            .where(calendar_entry.tenant_id == tenant_id)
-            .where(CalendarEntry.start_at > now)
+            .where(calendar_entry.start_at > now)
-            .where(CalendarEntry.status == "open")
+            .where(calendar_entry.status == "open")
-            .order_by(CalendarEntry.start_at.asc())
+            .order_by(calendar_entry.start_at.asc())
             .limit(20)
         )
         tasks = [_serialize(e) for e in result.scalars().all()]
@@ -194,7 +194,9 @@ async def get_open_tasks_handler(arguments: dict[str, Any], context: dict[str, A
 async def hybrid_search_handler(arguments: dict[str, Any], context: dict[str, Any]) -> str:
     """Perform hybrid search via unified_search search_engine."""
     try:
-        from app.plugins.builtins.unified_search.contracts import get_contract as get_search_contract
+        from app.plugins.builtins.unified_search.contracts import (
+            get_contract as get_search_contract,
+        )
         _search = get_search_contract()
         hybrid_search = _search.hybrid_search
 

app/plugins/builtins/ai_proactive/contracts.py

@@ -5,7 +5,13 @@ Exposes models, services, and job functions that other builtins plugins may need
 
 from __future__ import annotations
 
-from app.plugins.builtins.contracts import get_contract_registry
+from app.plugins.builtins.ai_proactive.context_tools import (
+    register_context_tools,
+)
+from app.plugins.builtins.ai_proactive.jobs import (
+    deep_analysis,
+    heartbeat,
+)
 from app.plugins.builtins.ai_proactive.models import (
     ContextLog,
     ProactiveSettings,
@@ -20,13 +26,7 @@ from app.plugins.builtins.ai_proactive.services import (
     mark_dismissed,
     push_suggestion,
 )
-from app.plugins.builtins.ai_proactive.context_tools import (
+from app.plugins.builtins.contracts import get_contract_registry
-    register_context_tools,
-)
-from app.plugins.builtins.ai_proactive.jobs import (
-    deep_analysis,
-    heartbeat,
-)
 
 
 class AiProactiveContract:

app/plugins/builtins/ai_proactive/jobs.py

@@ -10,23 +10,23 @@ Deep analysis job runs after context-change for deeper analysis:
 
 from __future__ import annotations
 
-import os
 import json
 import logging
+import os
 import uuid
+from datetime import UTC
 from typing import Any
 
-from app.ai.llm_client import llm_complete
 from sqlalchemy import select
 
+from app.ai.llm_client import llm_complete
 from app.core.db import create_db_session
 from app.core.notifications import create_notification
 from app.models.audit import AuditLog
 from app.models.contact import Contact
-from app.plugins.builtins.ai_proactive.models import ProactiveSuggestion, ProactiveSettings
+from app.plugins.builtins.ai_proactive.models import ProactiveSuggestion
 from app.plugins.builtins.ai_proactive.services import (
     _serialize_row,
-    generate_suggestion,
     get_user_settings,
     push_suggestion,
 )
@@ -175,9 +175,10 @@ async def deep_analysis(
 
         # Similar entities via unified_search
         try:
-            from app.plugins.builtins.unified_search.contracts import get_contract as get_search_contract
+            from app.plugins.builtins.unified_search.contracts import (
+                get_contract as get_search_contract,
+            )
             _search = get_search_contract()
-            hybrid_search = _search.hybrid_search
             find_similar_all_types = _search.hybrid_search  # alias
 
             extended_context["similar"] = await find_similar_all_types(
@@ -339,9 +340,10 @@ async def heartbeat(ctx: dict[str, Any], user_id: str, tenant_id: str) -> None:
 
         async with create_db_session(tid) as db:
             # Check if heartbeat is enabled and get configuration
-            from app.plugins.builtins.ai_proactive.models import ProactiveSettings
             from sqlalchemy import select as sa_select
 
+            from app.plugins.builtins.ai_proactive.models import ProactiveSettings
+
             settings_result = await db.execute(
                 sa_select(ProactiveSettings)
                 .where(ProactiveSettings.tenant_id == tid)
@@ -390,9 +392,9 @@ async def heartbeat(ctx: dict[str, Any], user_id: str, tenant_id: str) -> None:
             contact_count = contact_count_result.scalar() or 0
 
             # Build status message
-            from datetime import datetime, timezone
+            from datetime import datetime
 
-            now_str = datetime.now(timezone.utc).strftime("%H:%M:%S")
+            now_str = datetime.now(UTC).strftime("%H:%M:%S")
             status_content = (
                 f"**System aktiv** — überwacht {contact_count} Kontakte\n"
                 f"_Letztes Update: {now_str}_"
@@ -416,6 +418,6 @@ async def heartbeat(ctx: dict[str, Any], user_id: str, tenant_id: str) -> None:
 
 
 # Register all job functions with the job registry
-from app.core.job_registry import register_job
+from app.core.job_registry import register_job  # noqa: E402
 
 register_job("deep_analysis", deep_analysis)

app/plugins/builtins/ai_proactive/models.py

@@ -16,7 +16,8 @@ from sqlalchemy import (
     String,
     Text,
 )
-from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin

app/plugins/builtins/ai_proactive/plugin.py

@@ -11,7 +11,7 @@ import logging
 from typing import Any
 
 from app.plugins.base import BasePlugin
-from app.plugins.manifest import PluginManifest, PluginRouteDef, FrontendSettingsPage
+from app.plugins.manifest import FrontendSettingsPage, PluginManifest, PluginRouteDef
 
 logger = logging.getLogger(__name__)
 
@@ -56,16 +56,23 @@ class AIProactivePlugin(BasePlugin):
         super().__init__()
         self._proactive_handler = None
 
+    def get_entity_models(self) -> dict[str, type]:
+        from app.plugins.builtins.ai_proactive.models import ProactiveSuggestion
+        return {"proactive_suggestion": ProactiveSuggestion}
+
+    def get_job_modules(self) -> list[str]:
+        return ["app.plugins.builtins.ai_proactive.jobs"]
+
     async def on_activate(self, db, service_container, event_bus) -> None:
         """Register context tools, subscribe to events, and register as participant."""
         await super().on_activate(db, service_container, event_bus)
         try:
-            from app.plugins.builtins.ai_proactive.context_tools import (
-                register_context_tools,
-            )
             from app.plugins.builtins.ai_assistant.contracts import (
                 get_tool_registry,
             )
+            from app.plugins.builtins.ai_proactive.context_tools import (
+                register_context_tools,
+            )
 
             register_context_tools(get_tool_registry())
             logger.info("AI Proactive context tools registered")

app/plugins/builtins/ai_proactive/routes.py

@@ -15,8 +15,7 @@ from fastapi import APIRouter, Depends, HTTPException, Query
 from fastapi.responses import StreamingResponse
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.core.db import get_db, set_tenant_context
+from app.core.db import get_db
-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 (
@@ -30,9 +29,9 @@ from app.plugins.builtins.ai_proactive.schemas import (
     ContextReport,
     SettingsResponse,
     SettingsUpdate,
+    StatsResponse,
     SuggestionListResponse,
     SuggestionResponse,
-    StatsResponse,
 )
 from app.plugins.builtins.ai_proactive.services import (
     execute_suggested_action,
@@ -184,7 +183,7 @@ async def dismiss_suggestion(
     try:
         sid = uuid.UUID(suggestion_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid suggestion ID")
+        raise HTTPException(status_code=400, detail="Invalid suggestion ID") from None
 
     success = await mark_dismissed(db, sid, user_id, tenant_id)
     if not success:
@@ -210,7 +209,7 @@ async def act_on_suggestion(
     try:
         sid = uuid.UUID(suggestion_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid suggestion ID")
+        raise HTTPException(status_code=400, detail="Invalid suggestion ID") from None
 
     result = await execute_suggested_action(
         db, sid, action.action_index, user_id, tenant_id, current_user
@@ -245,7 +244,7 @@ async def stream_suggestions(
             try:
                 suggestion = await asyncio.wait_for(queue.get(), timeout=30)
                 yield f"data: {json.dumps(suggestion, default=str)}\n\n"
-            except asyncio.TimeoutError:
+            except TimeoutError:
                 yield ": keepalive\n\n"
 
     return StreamingResponse(

app/plugins/builtins/ai_proactive/services.py

@@ -6,30 +6,28 @@ suggestions, pushes via SSE, and manages suggestion lifecycle.
 
 from __future__ import annotations
 
-import os
 import asyncio
 import json
 import logging
+import os
 import uuid
-from datetime import UTC, datetime, timedelta
+from datetime import UTC, datetime
 from typing import Any
 
 import litellm
-from app.ai.llm_client import llm_complete
 from sqlalchemy import func, select, text
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.core.cache import get_cache
+from app.ai.llm_client import llm_complete
-from app.core.db import create_db_session, get_session_factory
+from app.core.db import create_db_session
 from app.core.notifications import create_notification
 from app.models.audit import AuditLog
 from app.models.contact import Contact, ContactPerson
-from app.models.contact import Contact, ContactPerson
 from app.plugins.builtins.ai_proactive.models import (
-    ContextLog,
     ProactiveSettings,
     ProactiveSuggestion,
 )
+
 logger = logging.getLogger(__name__)
 
 litellm.suppress_debug_info = True
@@ -81,9 +79,10 @@ async def is_rate_limited(
     and ``window_seconds=rate_limit_seconds``.
     Returns ``True`` if rate-limited, ``False`` if allowed.
     """
-    from app.core.rate_limit import check_rate_limit
     from fastapi import HTTPException
 
+    from app.core.rate_limit import check_rate_limit
+
     redis_key = f"rate:ai_proactive:{tenant_id}:{user_id}"
     try:
         await check_rate_limit(redis_key, max_attempts=1, window_seconds=rate_limit_seconds)
@@ -208,18 +207,18 @@ async def gather_context(
         # Upcoming calendar events
         from app.plugins.builtins.calendar.contracts import get_contract as get_calendar_contract
         _cal = get_calendar_contract()
-        CalendarEntry = _cal.CalendarEntry
+        calendar_entry = _cal.calendar_entry
-        CalendarEntryLink = _cal.CalendarEntryLink
+        calendar_entry_link = _cal.calendar_entry_link
 
         now = datetime.now(UTC)
         event_result = await db.execute(
-            select(CalendarEntry)
+            select(calendar_entry)
-            .join(CalendarEntryLink, CalendarEntryLink.entry_id == CalendarEntry.id)
+            .join(calendar_entry_link, calendar_entry_link.entry_id == calendar_entry.id)
-            .where(CalendarEntryLink.entity_type == "contact")
+            .where(calendar_entry_link.entity_type == "contact")
-            .where(CalendarEntryLink.entity_id == entity_id)
+            .where(calendar_entry_link.entity_id == entity_id)
-            .where(CalendarEntry.tenant_id == tenant_id)
+            .where(calendar_entry.tenant_id == tenant_id)
-            .where(CalendarEntry.start_at > now)
+            .where(calendar_entry.start_at > now)
-            .order_by(CalendarEntry.start_at.asc())
+            .order_by(calendar_entry.start_at.asc())
             .limit(5)
         )
         context["events"] = [_serialize_row(e) for e in event_result.scalars().all()]
@@ -323,18 +322,18 @@ async def gather_context(
         # Upcoming events
         from app.plugins.builtins.calendar.contracts import get_contract as get_calendar_contract
         _cal = get_calendar_contract()
-        CalendarEntry = _cal.CalendarEntry
+        calendar_entry = _cal.calendar_entry
-        CalendarEntryLink = _cal.CalendarEntryLink
+        calendar_entry_link = _cal.calendar_entry_link
 
         now = datetime.now(UTC)
         event_result = await db.execute(
-            select(CalendarEntry)
+            select(calendar_entry)
-            .join(CalendarEntryLink, CalendarEntryLink.entry_id == CalendarEntry.id)
+            .join(calendar_entry_link, calendar_entry_link.entry_id == calendar_entry.id)
-            .where(CalendarEntryLink.entity_type == "contact")
+            .where(calendar_entry_link.entity_type == "contact")
-            .where(CalendarEntryLink.entity_id == entity_id)
+            .where(calendar_entry_link.entity_id == entity_id)
-            .where(CalendarEntry.tenant_id == tenant_id)
+            .where(calendar_entry.tenant_id == tenant_id)
-            .where(CalendarEntry.start_at > now)
+            .where(calendar_entry.start_at > now)
-            .order_by(CalendarEntry.start_at.asc())
+            .order_by(calendar_entry.start_at.asc())
             .limit(5)
         )
         context["events"] = [_serialize_row(e) for e in event_result.scalars().all()]
@@ -365,7 +364,9 @@ async def gather_context(
 
     # Semantically similar entities via unified_search
     try:
-        from app.plugins.builtins.unified_search.contracts import get_contract as get_search_contract
+        from app.plugins.builtins.unified_search.contracts import (
+            get_contract as get_search_contract,
+        )
         _search = get_search_contract()
         find_similar_all_types = _search.hybrid_search
 

app/plugins/builtins/ai_ui_control/contracts.py

@@ -5,8 +5,6 @@ Exposes the WebSocket manager and UI command schemas for other plugins.
 
 from __future__ import annotations
 
-from app.plugins.builtins.contracts import get_contract_registry
-from app.plugins.builtins.ai_ui_control.websocket_manager import AIUIControlWSManager
 from app.plugins.builtins.ai_ui_control.schemas import (
     UICommand,
     UICommandCreate,
@@ -16,6 +14,8 @@ from app.plugins.builtins.ai_ui_control.schemas import (
     UICommandStatusResponse,
     UICommandType,
 )
+from app.plugins.builtins.ai_ui_control.websocket_manager import AIUIControlWSManager
+from app.plugins.builtins.contracts import get_contract_registry
 
 
 class AiUiControlContract:

app/plugins/builtins/ai_ui_control/routes.py

@@ -11,12 +11,10 @@ import json
 import logging
 import uuid
 
-from fastapi import APIRouter, WebSocket, WebSocketDisconnect, Depends, HTTPException, Request
+from fastapi import APIRouter, Depends, HTTPException, Request, WebSocket, WebSocketDisconnect
-from fastapi.responses import JSONResponse
 
 from app.deps import require_permission
 from app.plugins.builtins.ai_ui_control.schemas import (
-    UICommand,
     UICommandCreate,
     UICommandFeedback,
     UICommandResponse,
@@ -45,7 +43,7 @@ async def send_ui_command(
     Authentication: requires valid session (same-user commands only).
     """
     from app.config import get_settings
-    from app.core.auth import get_session_data, get_redis
+    from app.core.auth import get_redis, get_session_data
     from app.core.service_container import get_container
 
     settings = get_settings()
@@ -117,7 +115,7 @@ async def get_command_status(
     AI agents call this to check if the frontend has executed the command.
     """
     from app.config import get_settings
-    from app.core.auth import get_session_data, get_redis
+    from app.core.auth import get_redis, get_session_data
     from app.core.service_container import get_container
 
     settings = get_settings()
@@ -173,7 +171,7 @@ async def get_command_status(
 async def get_online_users(request: Request):
     """Check which users are currently online (have active frontend WS connections)."""
     from app.config import get_settings
-    from app.core.auth import get_session_data, get_redis
+    from app.core.auth import get_redis, get_session_data
     from app.core.service_container import get_container
 
     settings = get_settings()
@@ -225,9 +223,11 @@ async def ai_ui_control_ws(websocket: WebSocket):
     tenant_id = auth["tenant_id"]
 
     # Plugin-Gate: check if ai_ui_control plugin is active (global + tenant)
-    from app.core.permission_registry import get_permission_registry
-    from sqlalchemy import text as sa_text
     import uuid as _uuid
+
+    from sqlalchemy import text as sa_text
+
+    from app.core.permission_registry import get_permission_registry
     try:
         registry = get_permission_registry()
         if not registry.is_plugin_active("ai_ui_control"):

app/plugins/builtins/ai_ui_control/schemas.py

@@ -2,13 +2,13 @@
 
 from __future__ import annotations
 
-from enum import Enum
+from enum import StrEnum
 from typing import Any
 
 from pydantic import BaseModel, Field
 
 
-class UICommandType(str, Enum):
+class UICommandType(StrEnum):
     """Supported UI command types."""
     navigate = "navigate"
     filter = "filter"
@@ -18,7 +18,7 @@ class UICommandType(str, Enum):
     settings = "settings"
 
 
-class UICommandStatus(str, Enum):
+class UICommandStatus(StrEnum):
     """Status of a UI command execution."""
     pending = "pending"
     delivered = "delivered"

app/plugins/builtins/ai_ui_control/websocket_manager.py

@@ -15,6 +15,7 @@ import uuid
 from typing import Any
 
 from fastapi import WebSocket
+from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.ws_helpers import (
     authenticate_ws,
@@ -28,7 +29,6 @@ from app.core.ws_pubsub import (
     get_tenant_channel,
     subscribe_to_channel,
 )
-from sqlalchemy.ext.asyncio import AsyncSession
 
 logger = logging.getLogger(__name__)
 
@@ -176,9 +176,9 @@ class AIUIControlWSManager:
         if command_id:
             self._feedback[command_id] = feedback
             # Enforce max feedback entries (FIFO eviction)
-            MAX_FEEDBACK_ENTRIES = 100
+            max_feedback_entries = 100
-            if len(self._feedback) > MAX_FEEDBACK_ENTRIES:
+            if len(self._feedback) > max_feedback_entries:
-                keys_to_remove = list(self._feedback.keys())[:-MAX_FEEDBACK_ENTRIES]
+                keys_to_remove = list(self._feedback.keys())[:-max_feedback_entries]
                 for key in keys_to_remove:
                     del self._feedback[key]
             logger.debug(f"AI UI Control: feedback stored for command {command_id}: {feedback.get('status')}")

app/plugins/builtins/automation/agent_comm.py

@@ -27,8 +27,8 @@ async def send_agent_message(
     3. Enqueue run_agent for the target agent with the message as trigger_data
     4. Return delivery status
     """
-    from app.plugins.builtins.automation.models import AgentDefinition
     from app.plugins.builtins.automation.agent_runner import run_agent
+    from app.plugins.builtins.automation.models import AgentDefinition
 
     # 1. Find target agent by name
     result = await db.execute(
@@ -56,7 +56,6 @@ async def send_agent_message(
     # 2. Create a kommunikation message in a dedicated agent room
     try:
         from app.plugins.builtins.kommunikation.contracts import Message, Room
-        from app.plugins.builtins.kommunikation.contracts import RoomService
 
         # Find or create the agent-to-agent room
         room_name = f"agent:{from_agent_id}:{target_agent.id}"

app/plugins/builtins/automation/agent_coordinator.py

@@ -12,7 +12,8 @@ import uuid
 from datetime import UTC, datetime
 from typing import Any
 
-from sqlalchemy import select, update as sa_update
+from sqlalchemy import select
+from sqlalchemy import update as sa_update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.plugins.builtins.automation.models import AgentSubtask
@@ -60,12 +61,12 @@ class AgentCoordinator:
         return subtask
 
     @staticmethod
-    async def wait_for_subtask(
+    async def wait_for_subtask(  # noqa: ASYNC109
         db: AsyncSession,
         tenant_id: uuid.UUID,
         subtask_id: uuid.UUID,
         poll_interval: float = 0.5,
-        timeout: float = 300.0,
+        timeout: float = 300.0,  # noqa: ASYNC109
     ) -> dict[str, Any]:
         """Wait for a subtask to complete, fail, or be cancelled.
 

app/plugins/builtins/automation/agent_routes.py

@@ -7,13 +7,13 @@ from __future__ import annotations
 
 import logging
 import uuid
+from datetime import UTC
 from typing import Any
 
 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.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.automation.models import (
     AgentDefinition,
@@ -216,7 +216,7 @@ async def get_agent(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     agent = await AgentService.get_by_id(db, tenant_id, aid)
     if agent is None:
@@ -241,7 +241,7 @@ async def update_agent(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     agent = await AgentService.update(
         db, tenant_id, aid, data.model_dump(exclude_none=True), user_id=user_id
@@ -265,7 +265,7 @@ async def delete_agent(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     success = await AgentService.delete(db, tenant_id, aid)
     if not success:
@@ -290,7 +290,7 @@ async def execute_agent(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     agent = await AgentService.get_by_id(db, tenant_id, aid)
     if agent is None:
@@ -325,9 +325,10 @@ async def execute_agent(
     )
 
     # Update run with results
+    from datetime import datetime
+
     from sqlalchemy import update as sa_update
-    from datetime import datetime, timezone
+    now = datetime.now(UTC)
-    now = datetime.now(timezone.utc)
     async with db.begin():
         await db.execute(
             sa_update(AgentRun)
@@ -358,7 +359,7 @@ async def test_run_agent(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     agent = await AgentService.get_by_id(db, tenant_id, aid)
     if agent is None:
@@ -397,7 +398,7 @@ async def list_agent_runs(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     items, total = await RunLogService.list_agent_runs(
         db, tenant_id, agent_id=aid, status=status, limit=limit, offset=offset
@@ -428,7 +429,7 @@ async def list_agent_versions(
     try:
         aid = uuid.UUID(agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     items, total = await AgentService.get_versions(
         db, tenant_id, aid, limit=limit, offset=offset
@@ -457,7 +458,7 @@ async def restore_agent_version(
         aid = uuid.UUID(agent_id)
         vid = uuid.UUID(version_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid ID")
+        raise HTTPException(status_code=400, detail="Invalid ID") from None
 
     agent = await AgentService.restore_version(
         db, tenant_id, aid, vid, user_id=user_id
@@ -485,7 +486,7 @@ async def send_agent_message_endpoint(
     try:
         aid = uuid.UUID(id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     # Verify the source agent exists
     agent = await AgentService.get_by_id(db, tenant_id, aid)

app/plugins/builtins/automation/agent_runner.py

@@ -16,8 +16,8 @@ from typing import Any
 
 from sqlalchemy import func, select
 
-from app.core.db import get_session_factory
 from app.ai.llm_client import llm_complete
+from app.core.db import get_session_factory
 
 logger = logging.getLogger(__name__)
 
@@ -161,15 +161,6 @@ async def run_agent(
     try:
         async def _run_llm() -> None:
             """Inner coroutine for LLM call with tool execution."""
-            from app.ai.llm_client import LLMClient
-
-            llm = LLMClient(
-                model=agent.model or None,
-                api_key=agent.api_key or None,
-                api_base=agent.api_base or None,
-                provider=agent.provider or None,
-            )
-
             # Build system prompt from agent configuration
             system_prompt = agent.system_prompt or "You are a helpful AI assistant."
             user_prompt = f"Context: {context_data}"
@@ -241,7 +232,7 @@ async def run_agent(
         # Run with timeout
         try:
             await asyncio.wait_for(_run_llm(), timeout=max_duration)
-        except asyncio.TimeoutError:
+        except TimeoutError:
             logger.warning(
                 "Agent %s execution timed out after %d seconds",
                 agent.id, max_duration,
@@ -295,6 +286,6 @@ async def run_agent(
 
 
 # Register all job functions with the job registry
-from app.core.job_registry import register_job
+from app.core.job_registry import register_job  # noqa: E402
 
-register_job("run_agent", run_agent)
+register_job("run_agent", run_agent)

app/plugins/builtins/automation/contracts.py

@@ -5,7 +5,9 @@ Exposes models, services, scheduler, and agent communication for other plugins.
 
 from __future__ import annotations
 
-from app.plugins.builtins.contracts import get_contract_registry
+from app.plugins.builtins.automation.agent_comm import send_agent_message
+from app.plugins.builtins.automation.agent_runner import run_agent
+from app.plugins.builtins.automation.execution_engine import run_automation
 from app.plugins.builtins.automation.models import (
     AgentDefinition,
     AgentRun,
@@ -15,19 +17,17 @@ from app.plugins.builtins.automation.models import (
     AutomationRun,
     AutomationVersion,
 )
+from app.plugins.builtins.automation.scheduler import (
+    calculate_next_run,
+    scheduler_tick,
+)
 from app.plugins.builtins.automation.services import (
     AgentService,
     AutomationService,
     CronJobService,
     RunLogService,
 )
-from app.plugins.builtins.automation.agent_runner import run_agent
+from app.plugins.builtins.contracts import get_contract_registry
-from app.plugins.builtins.automation.execution_engine import run_automation
-from app.plugins.builtins.automation.scheduler import (
-    calculate_next_run,
-    scheduler_tick,
-)
-from app.plugins.builtins.automation.agent_comm import send_agent_message
 
 
 class AutomationContract:
@@ -73,8 +73,6 @@ get_contract_registry().register("automation", _contract)
 __all__ = [
     "AutomationContract",
     "AgentDefinition",
-    "Automation",
-    "CronJob",
     "AgentService",
     "AutomationService",
     "CronJobService",

app/plugins/builtins/automation/execution_engine.py

@@ -2,9 +2,7 @@
 
 from __future__ import annotations
 
-import json
 import logging
-from datetime import UTC, datetime
 from typing import Any
 
 import httpx
@@ -166,9 +164,10 @@ async def _execute_action(
             return result
 
         try:
-            from app.services.workflow_service import create_instance
             from uuid import UUID
 
+            from app.services.workflow_service import create_instance
+
             factory = get_session_factory()
             async with factory() as db:
                 instance = await create_instance(
@@ -280,6 +279,6 @@ async def run_automation(
 
 
 # Register all job functions with the job registry
-from app.core.job_registry import register_job
+from app.core.job_registry import register_job  # noqa: E402
 
 register_job("run_automation", run_automation)

app/plugins/builtins/automation/jobs.py

@@ -16,9 +16,10 @@ async def backup_check(ctx: dict[str, Any]) -> None:
     Runs daily at 2:00. Checks the last backup timestamp from system settings
     and publishes backup.completed or backup.failed events accordingly.
     """
-    from app.core.event_bus import get_event_bus
     from sqlalchemy import text
 
+    from app.core.event_bus import get_event_bus
+
     event_bus = get_event_bus()
     factory = get_session_factory()
 

app/plugins/builtins/automation/models.py

@@ -17,7 +17,8 @@ from sqlalchemy import (
     Text,
     UniqueConstraint,
 )
-from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin

app/plugins/builtins/automation/plugin.py

@@ -176,6 +176,18 @@ class AutomationPlugin(BasePlugin):
         self._contributed_cron_jobs: dict[str, list[str]] = {}  # plugin_name -> [cron_job_name, ...]
         self._contributed_heartbeats: dict[str, list[str]] = {}  # plugin_name -> [agent_name, ...]
 
+    def get_entity_models(self) -> dict[str, type]:
+        from app.plugins.builtins.automation.models import AgentDefinition, AutomationDefinition
+        return {"agent_definition": AgentDefinition, "automation_definition": AutomationDefinition}
+
+    def get_job_modules(self) -> list[str]:
+        return [
+            "app.plugins.builtins.automation.scheduler",
+            "app.plugins.builtins.automation.workflow_timeout",
+            "app.plugins.builtins.automation.agent_runner",
+            "app.plugins.builtins.automation.execution_engine",
+        ]
+
     async def on_activate(self, db, service_container, event_bus) -> None:
         """Register event listeners on activation."""
         await super().on_activate(db, service_container, event_bus)
@@ -187,7 +199,9 @@ class AutomationPlugin(BasePlugin):
             logger.exception("Failed to register agent communication tool")
         # Register agent coordinator tools
         try:
-            from app.plugins.builtins.automation.agent_coordinator import register_agent_coordinator_tools
+            from app.plugins.builtins.automation.agent_coordinator import (
+                register_agent_coordinator_tools,
+            )
             register_agent_coordinator_tools()
         except Exception:
             logger.exception("Failed to register agent coordinator tools")
@@ -230,7 +244,9 @@ class AutomationPlugin(BasePlugin):
             logger.exception("Failed to unregister agent communication tool")
         # Unregister agent coordinator tools
         try:
-            from app.plugins.builtins.automation.agent_coordinator import unregister_agent_coordinator_tools
+            from app.plugins.builtins.automation.agent_coordinator import (
+                unregister_agent_coordinator_tools,
+            )
             unregister_agent_coordinator_tools()
         except Exception:
             logger.exception("Failed to unregister agent coordinator tools")
@@ -249,12 +265,16 @@ class AutomationPlugin(BasePlugin):
     async def register_plugin_contributions(self, db, plugin_name: str, manifest) -> None:
         """Register agent definitions, automation templates, cron jobs, and heartbeat configs
         from another plugin's manifest. Uses plugin name prefixing for conflict resolution."""
-        from app.plugins.builtins.automation.services import AgentService, AutomationService, CronJobService
-        from app.plugins.builtins.automation.models import AutomationCronJob
         from sqlalchemy import select
 
         # Get default tenant_id from the first tenant in the DB
         from app.models.tenant import Tenant
+        from app.plugins.builtins.automation.models import AutomationCronJob
+        from app.plugins.builtins.automation.services import (
+            AgentService,
+            AutomationService,
+            CronJobService,
+        )
         tenant_result = await db.execute(select(Tenant).limit(1))
         tenant = tenant_result.scalar_one_or_none()
         default_tenant_id = tenant.id if tenant else None
@@ -356,7 +376,11 @@ class AutomationPlugin(BasePlugin):
 
     async def unregister_plugin_contributions(self, db, plugin_name: str) -> None:
         """Remove all contributed definitions from a plugin that is being deactivated."""
-        from app.plugins.builtins.automation.services import AgentService, AutomationService, CronJobService
+        from app.plugins.builtins.automation.services import (
+            AgentService,
+            AutomationService,
+            CronJobService,
+        )
 
         # Remove contributed agents
         agent_names = self._contributed_agents.pop(plugin_name, [])
@@ -384,8 +408,9 @@ class AutomationPlugin(BasePlugin):
         cron_job_names = self._contributed_cron_jobs.pop(plugin_name, [])
         for cron_name in cron_job_names:
             try:
-                from app.plugins.builtins.automation.models import AutomationCronJob
                 from sqlalchemy import select
+
+                from app.plugins.builtins.automation.models import AutomationCronJob
                 result = await db.execute(
                     select(AutomationCronJob).where(AutomationCronJob.name == cron_name).limit(1)
                 )
@@ -411,9 +436,10 @@ class AutomationPlugin(BasePlugin):
 
     async def ensure_ai_proactive_heartbeat(self, db) -> None:
         """Migrate the hardcoded ai_proactive heartbeat to a configurable cron job."""
+        from sqlalchemy import select
+
         from app.plugins.builtins.automation.models import AutomationCronJob
         from app.plugins.builtins.automation.services import CronJobService
-        from sqlalchemy import select
 
         # Check if ai_proactive heartbeat cron job already exists
         result = await db.execute(
@@ -456,4 +482,4 @@ class AutomationPlugin(BasePlugin):
 
     async def on_workflow_timeout(self, payload: dict[str, Any]) -> None:
         """Handle workflow.timeout event — trigger matching automations."""
-        logger.debug("workflow.timeout event received: %s", payload)
+        logger.debug("workflow.timeout event received: %s", payload)

app/plugins/builtins/automation/routes.py

@@ -7,13 +7,13 @@ from __future__ import annotations
 
 import logging
 import uuid
+from datetime import UTC
 from typing import Any
 
 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.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.automation.models import (
     AutomationDefinition,
@@ -253,9 +253,10 @@ async def get_automation_settings(
 ):
     """Get automation settings (persisted in system_settings metadata)."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
-    from app.models.system_settings import SystemSettings
     from sqlalchemy import select
 
+    from app.models.system_settings import SystemSettings
+
     result = await db.execute(
         select(SystemSettings).where(SystemSettings.tenant_id == tenant_id)
     )
@@ -285,9 +286,9 @@ async def update_automation_settings(
 ):
     """Update automation settings (persisted in system_settings metadata)."""
     tenant_id = uuid.UUID(current_user["tenant_id"])
-    from app.models.system_settings import SystemSettings
     from sqlalchemy import select
-    from sqlalchemy.dialects.postgresql import JSONB
+
+    from app.models.system_settings import SystemSettings
 
     result = await db.execute(
         select(SystemSettings).where(SystemSettings.tenant_id == tenant_id)
@@ -345,7 +346,7 @@ async def get_automation(
     try:
         aid = uuid.UUID(automation_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid automation ID")
+        raise HTTPException(status_code=400, detail="Invalid automation ID") from None
 
     automation = await AutomationService.get_by_id(db, tenant_id, aid)
     if automation is None:
@@ -370,7 +371,7 @@ async def update_automation(
     try:
         aid = uuid.UUID(automation_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid automation ID")
+        raise HTTPException(status_code=400, detail="Invalid automation ID") from None
 
     automation = await AutomationService.update(
         db, tenant_id, aid, data.model_dump(exclude_none=True), user_id=user_id
@@ -394,7 +395,7 @@ async def delete_automation(
     try:
         aid = uuid.UUID(automation_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid automation ID")
+        raise HTTPException(status_code=400, detail="Invalid automation ID") from None
 
     success = await AutomationService.delete(db, tenant_id, aid)
     if not success:
@@ -419,7 +420,7 @@ async def execute_automation(
     try:
         aid = uuid.UUID(automation_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid automation ID")
+        raise HTTPException(status_code=400, detail="Invalid automation ID") from None
 
     automation = await AutomationService.get_by_id(db, tenant_id, aid)
     if automation is None:
@@ -441,7 +442,6 @@ async def execute_automation(
     await db.flush()
 
     # Execute automation via execution engine
-    import asyncio
     from app.plugins.builtins.automation.execution_engine import run_automation
 
     run_id = str(run.id)
@@ -456,9 +456,10 @@ async def execute_automation(
     )
 
     # Update run with results
+    from datetime import datetime
+
     from sqlalchemy import update as sa_update
-    from datetime import datetime, timezone
+    now = datetime.now(UTC)
-    now = datetime.now(timezone.utc)
     async with db.begin():
         await db.execute(
             sa_update(AutomationRun)
@@ -489,14 +490,16 @@ async def dry_run_automation(
     try:
         aid = uuid.UUID(automation_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid automation ID")
+        raise HTTPException(status_code=400, detail="Invalid automation ID") from None
 
     automation = await AutomationService.get_by_id(db, tenant_id, aid)
     if automation is None:
         raise HTTPException(status_code=404, detail="Automation not found")
 
     # Execute dry-run via execution engine
-    from app.plugins.builtins.automation.execution_engine import run_automation as execute_automation_engine
+    from app.plugins.builtins.automation.execution_engine import (
+        run_automation as execute_automation_engine,
+    )
 
     result = await execute_automation_engine(
         ctx={},
@@ -558,7 +561,7 @@ async def list_automation_runs(
     try:
         aid = uuid.UUID(automation_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid automation ID")
+        raise HTTPException(status_code=400, detail="Invalid automation ID") from None
 
     items, total = await RunLogService.list_automation_runs(
         db, tenant_id, automation_id=aid, status=status, limit=limit, offset=offset
@@ -589,7 +592,7 @@ async def list_automation_versions(
     try:
         aid = uuid.UUID(automation_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid automation ID")
+        raise HTTPException(status_code=400, detail="Invalid automation ID") from None
 
     items, total = await AutomationService.get_versions(
         db, tenant_id, aid, limit=limit, offset=offset
@@ -618,7 +621,7 @@ async def restore_automation_version(
         aid = uuid.UUID(automation_id)
         vid = uuid.UUID(version_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid ID")
+        raise HTTPException(status_code=400, detail="Invalid ID") from None
 
     automation = await AutomationService.restore_version(
         db, tenant_id, aid, vid, user_id=user_id
@@ -653,7 +656,7 @@ async def list_subtasks(
         parent_id = uuid.UUID(parent_agent_id) if parent_agent_id else None
         child_id = uuid.UUID(child_agent_id) if child_agent_id else None
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     from app.plugins.builtins.automation.agent_coordinator import AgentCoordinator
 
@@ -688,7 +691,7 @@ async def create_subtask(
         parent_id = uuid.UUID(data.parent_agent_id)
         child_id = uuid.UUID(data.child_agent_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid agent ID")
+        raise HTTPException(status_code=400, detail="Invalid agent ID") from None
 
     from app.plugins.builtins.automation.agent_coordinator import AgentCoordinator
 
@@ -718,10 +721,11 @@ async def get_subtask(
     try:
         sid = uuid.UUID(subtask_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid subtask ID")
+        raise HTTPException(status_code=400, detail="Invalid subtask ID") from None
+
+    from sqlalchemy import select
 
     from app.plugins.builtins.automation.models import AgentSubtask
-    from sqlalchemy import select
 
     result = await db.execute(
         select(AgentSubtask)
@@ -751,10 +755,11 @@ async def update_subtask(
     try:
         sid = uuid.UUID(subtask_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid subtask ID")
+        raise HTTPException(status_code=400, detail="Invalid subtask ID") from None
+
+    from sqlalchemy import select
 
     from app.plugins.builtins.automation.models import AgentSubtask
-    from sqlalchemy import select
 
     result = await db.execute(
         select(AgentSubtask)
@@ -795,7 +800,7 @@ async def cancel_subtask(
     try:
         sid = uuid.UUID(subtask_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid subtask ID")
+        raise HTTPException(status_code=400, detail="Invalid subtask ID") from None
 
     from app.plugins.builtins.automation.agent_coordinator import AgentCoordinator
 
@@ -823,7 +828,7 @@ async def wait_for_subtask(
     try:
         sid = uuid.UUID(subtask_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid subtask ID")
+        raise HTTPException(status_code=400, detail="Invalid subtask ID") from None
 
     from app.plugins.builtins.automation.agent_coordinator import AgentCoordinator
 
@@ -845,7 +850,7 @@ async def aggregate_subtasks(
     try:
         ids = [uuid.UUID(sid) for sid in subtask_ids]
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid subtask ID in list")
+        raise HTTPException(status_code=400, detail="Invalid subtask ID in list") from None
 
     from app.plugins.builtins.automation.agent_coordinator import AgentCoordinator
 

app/plugins/builtins/automation/scheduler.py

@@ -74,6 +74,6 @@ async def scheduler_tick(ctx: dict[str, Any]) -> None:
 
 
 # Register all job functions with the job registry
-from app.core.job_registry import register_job
+from app.core.job_registry import register_job  # noqa: E402
 
 register_job("scheduler_tick", scheduler_tick)

app/plugins/builtins/automation/schemas.py

@@ -2,12 +2,10 @@
 
 from __future__ import annotations
 
-from datetime import datetime
 from typing import Any
 
 from pydantic import BaseModel, Field
 
-
 # ─── Agent Definition Schemas ───
 
 

app/plugins/builtins/automation/services.py

@@ -10,10 +10,10 @@ import uuid
 from datetime import UTC, datetime
 from typing import Any
 
-from sqlalchemy import func, select, text, update
+from sqlalchemy import func, select
-from app.core.visibility import apply_visibility_filter
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.core.visibility import apply_visibility_filter
 from app.plugins.builtins.automation.models import (
     AgentDefinition,
     AgentRun,
@@ -668,7 +668,7 @@ class CronJobService:
         now = datetime.now(UTC)
         result = await db.execute(
             select(AutomationCronJob)
-            .where(AutomationCronJob.is_active == True)
+            .where(AutomationCronJob.is_active.is_(True))
             .where(AutomationCronJob.next_run_at <= now)
             .limit(limit)
         )

app/plugins/builtins/automation/tests/test_automation.py

@@ -7,33 +7,24 @@ since PostgreSQL may not be available in the dev container.
 from __future__ import annotations
 
 import uuid
+from collections.abc import AsyncGenerator
 from datetime import UTC, datetime, timedelta
-from typing import Any, AsyncGenerator
 
 import pytest
 import pytest_asyncio
-from sqlalchemy import create_engine, event
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
-from sqlalchemy.orm import sessionmaker
 
 from app.core.db import Base
 from app.plugins.builtins.automation.models import (
-    AgentDefinition,
     AgentRun,
-    AgentVersion,
-    AutomationCronJob,
-    AutomationDefinition,
     AutomationRun,
-    AutomationVersion,
 )
 from app.plugins.builtins.automation.services import (
     AgentService,
     AutomationService,
     CronJobService,
-    RunLogService,
 )
 
-
 # ─── Fixtures ───
 
 
@@ -536,12 +527,12 @@ class TestInfiniteLoopDetection:
         tool_call_count: dict[str, int] = {}
         tool_name = "send_email"
 
-        for i in range(5):
+        for _i in range(5):
             tool_call_count[tool_name] = tool_call_count.get(tool_name, 0) + 1
             if tool_call_count[tool_name] >= 5:
                 assert True
                 return
-        assert False, "Loop detection should have triggered"
+        raise AssertionError("Loop detection should have triggered")
 
     def test_different_tools_not_detected(self):
         """Test that different tool calls don't trigger loop detection."""
@@ -549,5 +540,5 @@ class TestInfiniteLoopDetection:
         for i in range(5):
             tool_call_count[f"tool_{i}"] = tool_call_count.get(f"tool_{i}", 0) + 1
             if tool_call_count[f"tool_{i}"] >= 5:
-                assert False, "Different tools should not trigger loop detection"
+                raise AssertionError("Different tools should not trigger loop detection")
         assert True

app/plugins/builtins/automation/workflow_timeout.py

@@ -67,7 +67,7 @@ async def check_workflow_timeouts(ctx: dict[str, Any]) -> None:
                         user_id=instance.initiated_by,
                         type="workflow_timeout",
                         title=f"Workflow '{workflow_name}' cancelled due to timeout",
-                        body=f"The workflow instance timed out and was automatically cancelled.",
+                        body="The workflow instance timed out and was automatically cancelled.",
                     )
                     db.add(notification)
 
@@ -83,6 +83,6 @@ async def check_workflow_timeouts(ctx: dict[str, Any]) -> None:
 
 
 # Register all job functions with the job registry
-from app.core.job_registry import register_job
+from app.core.job_registry import register_job  # noqa: E402
 
 register_job("check_workflow_timeouts", check_workflow_timeouts)

app/plugins/builtins/calendar/commands.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import logging
 import uuid
-from datetime import UTC, datetime
+from datetime import datetime
 from typing import Any
 
 import redis.asyncio as aioredis

app/plugins/builtins/calendar/contracts.py

@@ -2,8 +2,8 @@
 
 from __future__ import annotations
 
-from app.plugins.builtins.contracts import get_contract_registry
 from app.plugins.builtins.calendar.models import Calendar, CalendarEntry, CalendarEntryLink
+from app.plugins.builtins.contracts import get_contract_registry
 
 
 class CalendarContract:

app/plugins/builtins/calendar/plugin.py

@@ -3,7 +3,13 @@
 from __future__ import annotations
 
 from app.plugins.base import BasePlugin
-from app.plugins.manifest import PluginManifest, PluginRouteDef, FrontendMenuItem, FrontendPageRoute, FrontendDetailTab
+from app.plugins.manifest import (
+    FrontendDetailTab,
+    FrontendMenuItem,
+    FrontendPageRoute,
+    PluginManifest,
+    PluginRouteDef,
+)
 
 
 class CalendarPlugin(BasePlugin):
@@ -56,11 +62,45 @@ class CalendarPlugin(BasePlugin):
         contract_version="1.0.0",
     )
 
+    async def on_activate(self, db, service_container, event_bus) -> None:
+        """Activate plugin: register restore config + history hooks."""
+        await super().on_activate(db, service_container, event_bus)
+
+        # Register restore config for CalendarEntry entities (P0-7 fix)
+        from app.core.restore_registry import RestoreConfig, get_restore_registry
+        from app.plugins.builtins.calendar.models import CalendarEntry
+        get_restore_registry().register(RestoreConfig(
+            entity_type="calendar_entry",
+            model_class=CalendarEntry,
+            restore_permission="calendar:write",
+            excluded_fields=frozenset({"calendar_id", "created_by", "assigned_to", "source_mail_id"}),
+        ))
+
+        # Register history hooks for CalendarEntry entities (P0-8 fix)
+        from app.core.history_hooks import register_history_hooks
+        from app.core.hooks import get_hook_registry
+        register_history_hooks(
+            get_hook_registry(), "calendar_entry",
+            "calendar_entry.after_create", "calendar_entry.after_update", "calendar_entry.after_delete",
+            owner_tag="calendar",
+        )
+
     async def on_deactivate(
         self, db, service_container, event_bus
     ) -> None:
-        """Deactivate plugin: unregister contract and event listeners."""
+        """Deactivate plugin: unregister contract, restore, history, events."""
         # Contract abmelden
         from app.plugins.builtins.contracts import get_contract_registry
         get_contract_registry().unregister(self.manifest.name)
+
+        # Unregister restore config (P0-7 fix)
+        from app.core.restore_registry import get_restore_registry
+        get_restore_registry().unregister("calendar_entry")
+
+        # Unregister history hooks (free functions, not bound methods)
+        from app.core.hooks import get_hook_registry
+        get_hook_registry().unregister_actions_by_owner("calendar_entry.after_create", "calendar")
+        get_hook_registry().unregister_actions_by_owner("calendar_entry.after_update", "calendar")
+        get_hook_registry().unregister_actions_by_owner("calendar_entry.after_delete", "calendar")
+
         await super().on_deactivate(db, service_container, event_bus)

app/plugins/builtins/calendar/routes.py

@@ -22,7 +22,6 @@ 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, check_single_entity_access
 from app.deps import get_current_user, require_admin, require_permission
 from app.plugins.builtins.calendar.ics_utils import (
     export_entries_to_ics,
@@ -292,8 +291,8 @@ async def share_calendar(
 
     # Grant calendar:read (or calendar:write) permission to the shared user's role
     if body.user_id:
-        from app.models.user import UserTenant
         from app.models.role import Role
+        from app.models.user import UserTenant
         shared_user_id = _parse_uuid(body.user_id, "user_id")
         ut_q = await db.execute(
             select(UserTenant).where(

app/plugins/builtins/contacts/__init__.py

@@ -0,0 +1,3 @@
+from app.plugins.builtins.contacts.plugin import ContactsPlugin
+
+__all__ = ["ContactsPlugin"]

app/plugins/builtins/contacts/plugin.py

@@ -0,0 +1,95 @@
+"""Contacts plugin — Core CRM entity lifecycle management.
+
+Registers Contact entity models, permissions, restore config, and history hooks
+via the same plugin lifecycle as all other business plugins. No Core special case.
+"""
+
+from __future__ import annotations
+
+import logging
+
+from app.plugins.base import BasePlugin
+from app.plugins.manifest import PluginManifest
+
+logger = logging.getLogger(__name__)
+
+
+class ContactsPlugin(BasePlugin):
+    """Contacts plugin — manages Contact entity lifecycle (models, permissions, restore, history).
+
+    Routes remain in app/routes/contacts.py as core routes, but entity lifecycle
+    (permissions, entity models, restore, history) is managed through on_activate/on_deactivate.
+    """
+
+    manifest = PluginManifest(
+        name="contacts",
+        version="1.0.0",
+        display_name="Contacts",
+        description="Core CRM contacts — persons and companies.",
+        dependencies=[],
+        routes=[],  # Routes are registered as core routes in main.py
+        events=[],
+        migrations=[],
+        permissions=[
+            "contacts:read",
+            "contacts:write",
+            "contacts:delete",
+        ],
+        is_core=True,
+        author="LeoCRM Team",
+        min_app_version="1.0.0",
+        contract_version="1.0.0",
+    )
+
+    def get_entity_models(self) -> dict[str, type]:
+        from app.models.contact import Contact
+        return {
+            "contact": Contact,
+            "contacts": Contact,
+            "company": Contact,
+        }
+
+    async def on_activate(self, db, service_container, event_bus) -> None:
+        """Activate: register restore config + history hooks for Contact."""
+        await super().on_activate(db, service_container, event_bus)
+
+        # Register restore config for Contact entities
+        from app.core.restore_registry import RestoreConfig, get_restore_registry
+        from app.models.contact import Contact
+        get_restore_registry().register(RestoreConfig(
+            entity_type="contact",
+            model_class=Contact,
+            restore_permission="contacts:write",
+            excluded_fields=frozenset({
+                "search_tsv", "embedding", "default_person_id", "admin_contactperson_id",
+            }),
+        ))
+
+        # Register history hooks for Contact entities
+        from app.core.history_hooks import register_history_hooks
+        from app.core.hooks import get_hook_registry
+        register_history_hooks(
+            get_hook_registry(), "contact",
+            "contact.after_create", "contact.after_update", "contact.after_delete",
+            owner_tag="contacts",
+        )
+
+        logger.info("Contacts plugin activated: restore + history registered")
+
+    async def on_deactivate(self, db, service_container, event_bus) -> None:
+        """Deactivate: unregister restore config + history hooks for Contact."""
+        from app.core.restore_registry import get_restore_registry
+        get_restore_registry().unregister("contact")
+
+        # Unregister history hooks — use owner_tag to remove only this plugin's hooks
+        from app.core.hooks import get_hook_registry
+        hook_reg = get_hook_registry()
+        hook_reg.unregister_actions_by_owner("contact.after_create", "contacts")
+        hook_reg.unregister_actions_by_owner("contact.after_update", "contacts")
+        hook_reg.unregister_actions_by_owner("contact.after_delete", "contacts")
+
+        from app.plugins.builtins.contracts import get_contract_registry
+        get_contract_registry().unregister(self.manifest.name)
+
+        await super().on_deactivate(db, service_container, event_bus)
+        logger.info("Contacts plugin deactivated: restore + history unregistered")

app/plugins/builtins/dms/commands.py

@@ -47,7 +47,8 @@ class UploadFileCommand(BaseCommand):
         self.folder_id = folder_id
 
     async def run(self, db: AsyncSession, redis: aioredis.Redis, current_user: dict[str, Any]) -> CommandResult:
-        from app.plugins.builtins.dms.models import File as DmsFile, Folder
+        from app.plugins.builtins.dms.models import File as DmsFile
+        from app.plugins.builtins.dms.models import Folder
 
         tenant_id = self._tenant_id(current_user)
         user_id = self._user_id(current_user)
@@ -127,9 +128,10 @@ class DeleteFileCommand(BaseCommand):
         self.file_id = file_id
 
     async def run(self, db: AsyncSession, redis: aioredis.Redis, current_user: dict[str, Any]) -> CommandResult:
-        from app.plugins.builtins.dms.models import File as DmsFile
         from datetime import UTC, datetime
 
+        from app.plugins.builtins.dms.models import File as DmsFile
+
         tenant_id = self._tenant_id(current_user)
         try:
             fid = uuid.UUID(self.file_id)

app/plugins/builtins/dms/contracts.py

@@ -3,7 +3,8 @@
 from __future__ import annotations
 
 from app.plugins.builtins.contracts import get_contract_registry
-from app.plugins.builtins.dms.models import File as DmsFile, Folder
+from app.plugins.builtins.dms.models import File as DmsFile
+from app.plugins.builtins.dms.models import Folder
 
 
 class DmsContract: