import uuid
from datetime import datetime

from sqlalchemy import String, DateTime, JSON, Uuid, func
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class BlockchainCache(Base):
    __tablename__ = "blockchain_cache"

    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
    cache_key: Mapped[str] = mapped_column(String(256), unique=True, nullable=False, index=True)
    cache_value: Mapped[dict] = mapped_column(JSON, nullable=False)
    fetched_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)