myYouTube/backend/app/models/download_job.py

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from datetime import datetime
from sqlalchemy import DateTime, ForeignKey, Integer, String, Text, func
from sqlalchemy.orm import Mapped, mapped_column
from app.db import Base
# queued -> downloading -> postprocessing -> completed
# -> failed
# unknown: state could not be reconciled after a restart
ACTIVE_STATUSES = ("queued", "downloading", "postprocessing")
TERMINAL_STATUSES = ("completed", "failed")
class DownloadJob(Base):
__tablename__ = "download_jobs"
id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
video_id: Mapped[int] = mapped_column(ForeignKey("videos.id"), nullable=False, index=True)
status: Mapped[str] = mapped_column(String(20), nullable=False, default="queued")
metube_job_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
metube_filename: Mapped[str | None] = mapped_column(String, nullable=True)
media_url: Mapped[str | None] = mapped_column(String, nullable=True)
progress_percent: Mapped[int | None] = mapped_column(Integer, nullable=True)
error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
requested_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)
started_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
updated_at: Mapped[datetime] = mapped_column(
DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
)