"""SystemConfig ORM model - 系统配置键值表。"""

from sqlalchemy import Column, DateTime, String
from sqlalchemy.sql import func

from .base import Base


class SystemConfig(Base):
    __tablename__ = "system_config"

    key = Column(String(64), primary_key=True)
    value = Column(String(500), nullable=False, default="")
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())

    def __repr__(self):
        return f"<SystemConfig(key='{self.key}', value='{self.value[:30]}')>"