"""fc3c: download_event.metadata + import_settings downloader fields

Revision ID: 0013
Revises: 0012
Create Date: 2026-05-20

Additive only. download_event.metadata is the rich JSONB blob FC-3c
populates per run (run_stats, stdout/stderr, quarantined paths, import
summary). import_settings gains two operator-tunable downloader knobs:
download_rate_limit_seconds (gallery-dl extractor.sleep) and
download_validate_files (toggle the magic-byte validator).
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects import postgresql

revision: str = "0013"
down_revision: Union[str, None] = "0012"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column(
        "download_event",
        sa.Column(
            "metadata", postgresql.JSONB,
            nullable=False, server_default=sa.text("'{}'::jsonb"),
        ),
    )
    op.add_column(
        "import_settings",
        sa.Column(
            "download_rate_limit_seconds", sa.Float(),
            nullable=False, server_default="3.0",
        ),
    )
    op.add_column(
        "import_settings",
        sa.Column(
            "download_validate_files", sa.Boolean(),
            nullable=False, server_default=sa.true(),
        ),
    )


def downgrade() -> None:
    op.drop_column("import_settings", "download_validate_files")
    op.drop_column("import_settings", "download_rate_limit_seconds")
    op.drop_column("download_event", "metadata")
