from datetime import datetime
from sqlalchemy import DateTime, Integer, String, Text, func
from sqlalchemy.orm import Mapped, mapped_column
from app.db.session import Base

class KnowledgeItem(Base):
    __tablename__ = "knowledge_items"
    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    title: Mapped[str] = mapped_column(String(250), nullable=False, index=True)
    category: Mapped[str] = mapped_column(String(80), nullable=False, default="未分类")
    content: Mapped[str] = mapped_column(Text, nullable=False)
    source_url: Mapped[str | None] = mapped_column(String(1000), nullable=True)
    verification_status: Mapped[str] = mapped_column(String(30), nullable=False, default="pending")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())