siftlode/backend/alembic/versions/0036_download_center.py

"""download center core schema (yt-dlp)

Revision ID: 0036_download_center
Revises: 0035_saved_views
Create Date: 2026-07-02

The download center's data layer. `media_assets` is the shared file cache (one row per unique
source+format signature); `download_jobs` is the per-user request over it (worker-claimed via
FOR UPDATE SKIP LOCKED, live progress written back for polling); `download_profiles` are the
reusable format presets (builtins seeded in the next migration); `download_shares` grant a file
to another user; `download_quotas` hold admin-set per-user limits (default via sysconfig).
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0036_download_center"
down_revision: Union[str, None] = "0035_saved_views"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "media_assets",
        sa.Column("id", sa.Integer(), nullable=False),
        sa.Column("source_kind", sa.String(length=16), nullable=False),
        sa.Column("source_ref", sa.String(length=512), nullable=False),
        sa.Column("format_sig", sa.String(length=64), nullable=False),
        sa.Column("status", sa.String(length=16), server_default="pending", nullable=False),
        sa.Column("rel_path", sa.Text(), nullable=True),
        sa.Column("storyboard_path", sa.Text(), nullable=True),
        sa.Column("size_bytes", sa.BigInteger(), nullable=True),
        sa.Column("duration_s", sa.Integer(), nullable=True),
        sa.Column("width", sa.Integer(), nullable=True),
        sa.Column("height", sa.Integer(), nullable=True),
        sa.Column("container", sa.String(length=16), nullable=True),
        sa.Column("vcodec", sa.String(length=32), nullable=True),
        sa.Column("acodec", sa.String(length=32), nullable=True),
        sa.Column("nfo_written", sa.Boolean(), server_default="false", nullable=False),
        sa.Column("title", sa.Text(), nullable=True),
        sa.Column("uploader", sa.String(length=255), nullable=True),
        sa.Column("upload_date", sa.Date(), nullable=True),
        sa.Column("thumbnail_url", sa.Text(), nullable=True),
        sa.Column("error", sa.Text(), nullable=True),
        sa.Column("ref_count", sa.Integer(), server_default="0", nullable=False),
        sa.Column("last_access_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("source_kind", "source_ref", "format_sig", name="uq_media_asset_cache_key"),
    )
    op.create_index("ix_media_assets_status", "media_assets", ["status"])

    op.create_table(
        "download_profiles",
        sa.Column("id", sa.Integer(), nullable=False),
        sa.Column("user_id", sa.Integer(), nullable=True),
        sa.Column("name", sa.String(length=80), nullable=False),
        sa.Column("spec", sa.JSON(), nullable=False),
        sa.Column("is_builtin", sa.Boolean(), server_default="false", nullable=False),
        sa.Column("sort_order", sa.Integer(), server_default="0", nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_download_profiles_user_id", "download_profiles", ["user_id"])

    op.create_table(
        "download_jobs",
        sa.Column("id", sa.Integer(), nullable=False),
        sa.Column("user_id", sa.Integer(), nullable=False),
        sa.Column("asset_id", sa.Integer(), nullable=True),
        sa.Column("source_kind", sa.String(length=16), nullable=False),
        sa.Column("source_ref", sa.String(length=512), nullable=False),
        sa.Column("profile_id", sa.Integer(), nullable=True),
        sa.Column("profile_snapshot", sa.JSON(), nullable=False),
        sa.Column("display_name", sa.String(length=255), nullable=True),
        sa.Column("status", sa.String(length=16), server_default="queued", nullable=False),
        sa.Column("progress", sa.Integer(), server_default="0", nullable=False),
        sa.Column("speed_bps", sa.BigInteger(), nullable=True),
        sa.Column("eta_s", sa.Integer(), nullable=True),
        sa.Column("phase", sa.String(length=32), nullable=True),
        sa.Column("error", sa.Text(), nullable=True),
        sa.Column("queue_pos", sa.Integer(), server_default="0", nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["asset_id"], ["media_assets.id"], ondelete="SET NULL"),
        sa.ForeignKeyConstraint(["profile_id"], ["download_profiles.id"], ondelete="SET NULL"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_download_jobs_user_id", "download_jobs", ["user_id"])
    op.create_index("ix_download_jobs_asset_id", "download_jobs", ["asset_id"])
    op.create_index("ix_download_jobs_status", "download_jobs", ["status"])
    op.create_index("ix_download_jobs_claim", "download_jobs", ["status", "queue_pos"])

    op.create_table(
        "download_shares",
        sa.Column("id", sa.Integer(), nullable=False),
        sa.Column("job_id", sa.Integer(), nullable=False),
        sa.Column("from_user_id", sa.Integer(), nullable=False),
        sa.Column("to_user_id", sa.Integer(), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.ForeignKeyConstraint(["job_id"], ["download_jobs.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["from_user_id"], ["users.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["to_user_id"], ["users.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("job_id", "to_user_id", name="uq_download_share"),
    )
    op.create_index("ix_download_shares_job_id", "download_shares", ["job_id"])
    op.create_index("ix_download_shares_from_user_id", "download_shares", ["from_user_id"])
    op.create_index("ix_download_shares_to_user_id", "download_shares", ["to_user_id"])

    op.create_table(
        "download_quotas",
        sa.Column("user_id", sa.Integer(), nullable=False),
        sa.Column("max_bytes", sa.BigInteger(), nullable=False),
        sa.Column("max_concurrent", sa.Integer(), nullable=False),
        sa.Column("max_jobs", sa.Integer(), nullable=False),
        sa.Column("unlimited", sa.Boolean(), server_default="false", nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("user_id"),
    )


def downgrade() -> None:
    op.drop_table("download_quotas")
    op.drop_index("ix_download_shares_to_user_id", table_name="download_shares")
    op.drop_index("ix_download_shares_from_user_id", table_name="download_shares")
    op.drop_index("ix_download_shares_job_id", table_name="download_shares")
    op.drop_table("download_shares")
    op.drop_index("ix_download_jobs_claim", table_name="download_jobs")
    op.drop_index("ix_download_jobs_status", table_name="download_jobs")
    op.drop_index("ix_download_jobs_asset_id", table_name="download_jobs")
    op.drop_index("ix_download_jobs_user_id", table_name="download_jobs")
    op.drop_table("download_jobs")
    op.drop_index("ix_download_profiles_user_id", table_name="download_profiles")
    op.drop_table("download_profiles")
    op.drop_index("ix_media_assets_status", table_name="media_assets")
    op.drop_table("media_assets")