fix(e7): CI-Gate-Vorbereitung — ruff über app/ von 105 auf 0 Findings bereinigt; 8 echte F821-NameError-Produktionsbugs behoben (external_api stream_chat-Call-Signatur an stream_chat_comm angepasst, agent_runner uuid vor lokalem Import, automation/plugin UserTenant-Import, tasks delete-audit user_id, workflows/engine timedelta, unified_search/contracts Any); py311-kompatibles StepHandler-Alias statt type-Statement; E402/F841 bereinigt; Verifikation 85/89 grün (4 Failures = bekannter Vorbestand BUG-099)

app/plugins/builtins/knowledge/models.py

@@ -1,12 +1,17 @@
 """Knowledge extraction models — tracks LLM extractions and review queue."""
 from __future__ import annotations
+
 import uuid
 from datetime import datetime
-from sqlalchemy import DateTime, Float, ForeignKey, Index, Integer, String, Text, func
-from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
+
+from sqlalchemy import DateTime, Float, ForeignKey, Index, String, Text, func
+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
 
+
 class KnowledgeExtraction(Base, TenantMixin):
     """Tracks a single knowledge extraction run from a source (wiki, dms, mail, comm)."""
     __tablename__ = "knowledge_extractions"