from datetime import datetime
from sqlalchemy import Column, Integer, String, Text, DateTime

from app.database import Base


class CachedStats(Base):
    """Stores pre-calculated statistics updated by Celery beat."""
    __tablename__ = "cached_stats"

    id = Column(Integer, primary_key=True, index=True)
    key = Column(String(50), unique=True, nullable=False, index=True)
    value = Column(Text, nullable=False)  # JSON-encoded stats
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)