feat(downloads): M1 — schema, config, worker container, deps
- models: MediaAsset (shared file cache, unique on source+format_sig), DownloadJob (per-user request), DownloadProfile (presets), DownloadShare (ACL), DownloadQuota - migrations 0036 (5 tables) + 0037 (6 builtin presets) - sysconfig 'downloads' group (per-user defaults, retention/GC, layout, worker concurrency) - config: DOWNLOAD_ROOT / WORKER_ENABLED env + download defaults - deps: yt-dlp in requirements, ffmpeg in Dockerfile runtime stage - worker: dedicated container (python -m app.worker), thin idle entry (loop lands in M2) - localdev compose: worker service + downloads bind-mount; gitignore downloads/
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backend/alembic/versions/0036_download_center.py
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143
backend/alembic/versions/0036_download_center.py
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"""download center core schema (yt-dlp)
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Revision ID: 0036_download_center
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Revises: 0035_saved_views
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Create Date: 2026-07-02
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The download center's data layer. `media_assets` is the shared file cache (one row per unique
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source+format signature); `download_jobs` is the per-user request over it (worker-claimed via
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FOR UPDATE SKIP LOCKED, live progress written back for polling); `download_profiles` are the
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reusable format presets (builtins seeded in the next migration); `download_shares` grant a file
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to another user; `download_quotas` hold admin-set per-user limits (default via sysconfig).
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"""
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from typing import Sequence, Union
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import sqlalchemy as sa
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from alembic import op
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revision: str = "0036_download_center"
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down_revision: Union[str, None] = "0035_saved_views"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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op.create_table(
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"media_assets",
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sa.Column("id", sa.Integer(), nullable=False),
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sa.Column("source_kind", sa.String(length=16), nullable=False),
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sa.Column("source_ref", sa.String(length=512), nullable=False),
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sa.Column("format_sig", sa.String(length=64), nullable=False),
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sa.Column("status", sa.String(length=16), server_default="pending", nullable=False),
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sa.Column("rel_path", sa.Text(), nullable=True),
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sa.Column("storyboard_path", sa.Text(), nullable=True),
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sa.Column("size_bytes", sa.BigInteger(), nullable=True),
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sa.Column("duration_s", sa.Integer(), nullable=True),
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sa.Column("width", sa.Integer(), nullable=True),
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sa.Column("height", sa.Integer(), nullable=True),
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sa.Column("container", sa.String(length=16), nullable=True),
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sa.Column("vcodec", sa.String(length=32), nullable=True),
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sa.Column("acodec", sa.String(length=32), nullable=True),
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sa.Column("nfo_written", sa.Boolean(), server_default="false", nullable=False),
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sa.Column("title", sa.Text(), nullable=True),
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sa.Column("uploader", sa.String(length=255), nullable=True),
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sa.Column("upload_date", sa.Date(), nullable=True),
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sa.Column("thumbnail_url", sa.Text(), nullable=True),
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sa.Column("error", sa.Text(), nullable=True),
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sa.Column("ref_count", sa.Integer(), server_default="0", nullable=False),
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sa.Column("last_access_at", sa.DateTime(timezone=True), nullable=True),
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sa.Column("expires_at", sa.DateTime(timezone=True), nullable=True),
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sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
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sa.PrimaryKeyConstraint("id"),
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sa.UniqueConstraint("source_kind", "source_ref", "format_sig", name="uq_media_asset_cache_key"),
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)
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op.create_index("ix_media_assets_status", "media_assets", ["status"])
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op.create_table(
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"download_profiles",
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sa.Column("id", sa.Integer(), nullable=False),
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sa.Column("user_id", sa.Integer(), nullable=True),
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sa.Column("name", sa.String(length=80), nullable=False),
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sa.Column("spec", sa.JSON(), nullable=False),
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sa.Column("is_builtin", sa.Boolean(), server_default="false", nullable=False),
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sa.Column("sort_order", sa.Integer(), server_default="0", nullable=False),
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sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
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sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_index("ix_download_profiles_user_id", "download_profiles", ["user_id"])
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op.create_table(
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"download_jobs",
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sa.Column("id", sa.Integer(), nullable=False),
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sa.Column("user_id", sa.Integer(), nullable=False),
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sa.Column("asset_id", sa.Integer(), nullable=True),
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sa.Column("source_kind", sa.String(length=16), nullable=False),
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sa.Column("source_ref", sa.String(length=512), nullable=False),
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sa.Column("profile_id", sa.Integer(), nullable=True),
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sa.Column("profile_snapshot", sa.JSON(), nullable=False),
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sa.Column("display_name", sa.String(length=255), nullable=True),
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sa.Column("status", sa.String(length=16), server_default="queued", nullable=False),
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sa.Column("progress", sa.Integer(), server_default="0", nullable=False),
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sa.Column("speed_bps", sa.BigInteger(), nullable=True),
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sa.Column("eta_s", sa.Integer(), nullable=True),
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sa.Column("phase", sa.String(length=32), nullable=True),
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sa.Column("error", sa.Text(), nullable=True),
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sa.Column("queue_pos", sa.Integer(), server_default="0", nullable=False),
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sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
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sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
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sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
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sa.ForeignKeyConstraint(["asset_id"], ["media_assets.id"], ondelete="SET NULL"),
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sa.ForeignKeyConstraint(["profile_id"], ["download_profiles.id"], ondelete="SET NULL"),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_index("ix_download_jobs_user_id", "download_jobs", ["user_id"])
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op.create_index("ix_download_jobs_asset_id", "download_jobs", ["asset_id"])
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op.create_index("ix_download_jobs_status", "download_jobs", ["status"])
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op.create_index("ix_download_jobs_claim", "download_jobs", ["status", "queue_pos"])
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op.create_table(
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"download_shares",
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sa.Column("id", sa.Integer(), nullable=False),
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sa.Column("job_id", sa.Integer(), nullable=False),
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sa.Column("from_user_id", sa.Integer(), nullable=False),
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sa.Column("to_user_id", sa.Integer(), nullable=False),
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sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
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sa.ForeignKeyConstraint(["job_id"], ["download_jobs.id"], ondelete="CASCADE"),
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sa.ForeignKeyConstraint(["from_user_id"], ["users.id"], ondelete="CASCADE"),
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sa.ForeignKeyConstraint(["to_user_id"], ["users.id"], ondelete="CASCADE"),
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sa.PrimaryKeyConstraint("id"),
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sa.UniqueConstraint("job_id", "to_user_id", name="uq_download_share"),
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)
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op.create_index("ix_download_shares_job_id", "download_shares", ["job_id"])
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op.create_index("ix_download_shares_from_user_id", "download_shares", ["from_user_id"])
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op.create_index("ix_download_shares_to_user_id", "download_shares", ["to_user_id"])
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op.create_table(
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"download_quotas",
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sa.Column("user_id", sa.Integer(), nullable=False),
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sa.Column("max_bytes", sa.BigInteger(), nullable=False),
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sa.Column("max_concurrent", sa.Integer(), nullable=False),
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sa.Column("max_jobs", sa.Integer(), nullable=False),
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sa.Column("unlimited", sa.Boolean(), server_default="false", nullable=False),
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sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
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sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
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sa.PrimaryKeyConstraint("user_id"),
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)
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def downgrade() -> None:
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op.drop_table("download_quotas")
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op.drop_index("ix_download_shares_to_user_id", table_name="download_shares")
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op.drop_index("ix_download_shares_from_user_id", table_name="download_shares")
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op.drop_index("ix_download_shares_job_id", table_name="download_shares")
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op.drop_table("download_shares")
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op.drop_index("ix_download_jobs_claim", table_name="download_jobs")
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op.drop_index("ix_download_jobs_status", table_name="download_jobs")
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op.drop_index("ix_download_jobs_asset_id", table_name="download_jobs")
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op.drop_index("ix_download_jobs_user_id", table_name="download_jobs")
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op.drop_table("download_jobs")
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op.drop_index("ix_download_profiles_user_id", table_name="download_profiles")
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op.drop_table("download_profiles")
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op.drop_index("ix_media_assets_status", table_name="media_assets")
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op.drop_table("media_assets")
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