From a6bd7a66894701693b5b493d38caabc8f05b1ab4 Mon Sep 17 00:00:00 2001
From: huangzhuang_3rd <huangzhuang_3rd@tphai.com>
Date: Wed, 12 Aug 2026 13:30:44 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20AI=20Worker=20=E5=B9=B3=E5=8F=B0=20MVP?=
 =?UTF-8?q?=20v1.0.0=20-=20=E5=A4=9A=E7=A7=9F=E6=88=B7/=E9=A1=B9=E7=9B=AE?=
 =?UTF-8?q?=E7=AE=A1=E7=90=86/AI=20Worker/=E4=BB=BB=E5=8A=A1=E7=BC=96?=
 =?UTF-8?q?=E6=8E=92/HITL=E5=AE=A1=E6=A0=B8/=E6=88=90=E6=9C=AC=E6=B2=BB?=
 =?UTF-8?q?=E7=90=86?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 backend/app/models/base.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 backend/app/models/base.py

diff --git a/backend/app/models/base.py b/backend/app/models/base.py
new file mode 100644
index 0000000..b5f3d84
--- /dev/null
+++ b/backend/app/models/base.py
@@ -0,0 +1,19 @@
+"""Base model and common mixins."""
+from datetime import datetime
+from sqlalchemy import Column, Integer, DateTime, String
+from app.database import Base
+
+
+class TimestampMixin:
+    """Adds created_at and updated_at columns."""
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)
+
+
+class TenantMixin:
+    """Adds tenant_id column for multi-tenant isolation.
+
+    Every domain model inherits this to guarantee row-level tenant isolation.
+    Queries must always filter by tenant_id.
+    """
+    tenant_id = Column(Integer, nullable=False, index=True)