from sqlalchemy import String, Text
from sqlalchemy.orm import Mapped, mapped_column

from ..db.base import Base


class SystemConfig(Base):
    """系统级配置项，例如默认 LLM API Key、模型名称等。"""

    __tablename__ = "system_configs"

    key: Mapped[str] = mapped_column(String(100), primary_key=True)
    value: Mapped[str] = mapped_column(Text, nullable=False)
    description: Mapped[str | None] = mapped_column(String(255))