1.9

backend/app/models/group_announcement.py

@@ -0,0 +1,25 @@
+"""群公告模型"""
+
+from datetime import datetime
+
+from sqlalchemy import String, DateTime, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class GroupAnnouncement(Base):
+    __tablename__ = "group_announcements"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True)
+    conversation_id: Mapped[str] = mapped_column(
+        String(36), ForeignKey("conversations.id", ondelete="CASCADE"), nullable=False
+    )
+    author_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
+    content: Mapped[str] = mapped_column(String(1000), nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime, default=lambda: datetime.utcnow(), onupdate=lambda: datetime.utcnow()
+    )
+
+    author = relationship("User", foreign_keys=[author_id])