feat: init meijiaka-zj project from ai-meijiaka template

python-api/app/models/base.py

@@ -0,0 +1,49 @@
+"""
+基础模型定义
+============
+"""
+
+import uuid
+from datetime import UTC, datetime
+
+from sqlalchemy import DateTime
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.session import Base
+
+
+class BaseModel(Base):
+    """
+    基础模型 - 所有模型继承此类
+
+    提供：
+    - UUID 主键（自动生成）
+    - 创建时间
+    - 更新时间
+    """
+
+    __abstract__ = True
+
+    id: Mapped[str] = mapped_column(
+        UUID(as_uuid=False),
+        primary_key=True,
+        default=lambda: str(uuid.uuid4()),
+    )
+
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        default=lambda: datetime.now(UTC),
+        nullable=False,
+    )
+
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        default=lambda: datetime.now(UTC),
+        onupdate=lambda: datetime.now(UTC),
+        nullable=False,
+    )
+
+    def to_dict(self) -> dict:
+        """转换为字典（用于序列化）"""
+        return {column.name: getattr(self, column.name) for column in self.__table__.columns}