"""backup_blob: a library file already sent to the off-site bucket.

One row per (destination, sha256). `target` names the destination as
"<endpoint>/<bucket>", so pointing backups at another bucket leaves these rows
inert and that bucket's copy starts from the beginning. `key` is where the
file sits in the bucket (`media/ab/cd/<sha256><ext>`).
"""

from datetime import datetime

from sqlalchemy import BigInteger, DateTime, String, Text, func
from sqlalchemy.orm import Mapped, mapped_column

from .base import Base


class BackupBlob(Base):
    __tablename__ = "backup_blob"

    target: Mapped[str] = mapped_column(Text, primary_key=True)
    sha256: Mapped[str] = mapped_column(String(64), primary_key=True)
    key: Mapped[str] = mapped_column(Text, nullable=False)
    size_bytes: Mapped[int] = mapped_column(BigInteger, nullable=False)
    uploaded_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(),
    )