feat: 初始提交

backend/app/models/update_log.py

@@ -0,0 +1,18 @@
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, String, Text, func
+from sqlalchemy.orm import Mapped, mapped_column
+
+from ..db.base import Base
+
+
+class UpdateLog(Base):
+    """更新日志表，供公告与后台管理使用。"""
+
+    __tablename__ = "update_logs"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    content: Mapped[str] = mapped_column(Text, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    created_by: Mapped[str | None] = mapped_column(String(64))
+    is_pinned: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)