db: add table article

models/article.py

@@ -0,0 +1,50 @@
+from datetime import datetime
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy import String, Text, Integer, DateTime, func
+from models.base import Base
+
+
+class Article(Base):
+    __tablename__ = "t_article"
+
+    id: Mapped[int] = mapped_column(
+        Integer,
+        primary_key=True,
+        autoincrement=True,
+        comment="自动递增的唯一内容ID"
+    )
+
+    title: Mapped[str] = mapped_column(
+        String(256),
+        nullable=False,
+        index=True,
+        comment="标题"
+    )
+
+    keywords: Mapped[str | None] = mapped_column(
+        Text,
+        nullable=True,
+        comment="关键词"
+    )
+
+    content: Mapped[str | None] = mapped_column(
+        Text,
+        nullable=True,
+        comment="内容"
+    )
+
+    create_time: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+        comment="创建时间"
+    )
+
+    used: Mapped[bool] = mapped_column(
+        default=False,
+        nullable=False,
+        comment="是否已被使用"
+    )
+
+    def __repr__(self):
+        return f"<Article id={self.id} title={self.title!r} used={self.used!r}>"