task: add send common mail task

models/__init__.py

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+from models.source_content import SourceContent
+from models.article import Article

models/article.py

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+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}>"

models/base.py

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+from sqlalchemy.orm import DeclarativeBase
+
+class Base(DeclarativeBase):
+    pass

models/source_content.py

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+from datetime import datetime
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy import String, Text, Integer, DateTime, Index, func
+from models.base import Base
+
+
+class SourceContent(Base):
+    __tablename__ = "t_source_content"
+
+    id: Mapped[int] = mapped_column(
+        Integer,
+        primary_key=True,
+        autoincrement=True,
+        comment="自动递增的唯一内容ID"
+    )
+
+    link: Mapped[str] = mapped_column(
+        String(2048),
+        nullable=False,
+        index=True,
+        comment="链接"
+    )
+
+    platform: Mapped[str] = mapped_column(
+        String(32),
+        nullable=False,
+        comment="平台"
+    )
+
+    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"
+    )
+
+    update_time: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now(),
+        nullable=False,
+        comment="更新时间"
+    )
+
+    # ——可选优化：添加 项目 + 主题 联合唯一索引——
+    __table_args__ = (
+        Index("link", "link", unique=True),
+    )
+
+    def __repr__(self):
+        return f"<SourceContent id={self.id} link={self.link!r} platform={self.platform!r}>"