feat: complete huihui square avatar workflows

backend/app/models/__init__.py

@@ -75,6 +75,33 @@ class InteractionRecord(Base):
     created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
 
 
+class PendingReplyTask(Base):
+    __tablename__ = "pending_reply_tasks"
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
+    actor_user_id: Mapped[int] = mapped_column(BigInteger, nullable=False, index=True)
+    next_actor_user_id: Mapped[int | None] = mapped_column(BigInteger, index=True)
+    news_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    news_title: Mapped[str | None] = mapped_column(String(256))
+    article_org_id: Mapped[str | None] = mapped_column(String(64))
+    parent_comment_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    parent_comment: Mapped[dict | None] = mapped_column(JSON)
+    reply_to: Mapped[dict | None] = mapped_column(JSON)
+    root_content: Mapped[str | None] = mapped_column(Text)
+    context: Mapped[str | None] = mapped_column(Text)
+    next_probability: Mapped[float] = mapped_column(Float, default=0.3)
+    next_delay_min_seconds: Mapped[int] = mapped_column(Integer, default=30)
+    next_delay_max_seconds: Mapped[int] = mapped_column(Integer, default=7200)
+    status: Mapped[int] = mapped_column(SmallInteger, default=0, index=True)  # 0待发送 1发送中 2已发送 3失败
+    attempts: Mapped[int] = mapped_column(SmallInteger, default=0)
+    scheduled_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, index=True)
+    locked_at: Mapped[datetime | None] = mapped_column(DateTime)
+    sent_at: Mapped[datetime | None] = mapped_column(DateTime)
+    last_error: Mapped[str | None] = mapped_column(String(512))
+    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), onupdate=func.now())
+
+
 class TokenStat(Base):
     __tablename__ = "token_stats"