"""admin override for the maintenance re-validation batch size

Revision ID: 0018_maintenance_batch_setting
Revises: 0017_notifications
Create Date: 2026-06-18

Adds app_state.maintenance_revalidate_batch: an admin-tunable override (from the Scheduler
dashboard) for how many videos the maintenance job re-validates per run. NULL = use the
env/config default. Purely additive.
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0018_maintenance_batch_setting"
down_revision: Union[str, None] = "0017_notifications"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column(
        "app_state",
        sa.Column("maintenance_revalidate_batch", sa.Integer(), nullable=True),
    )


def downgrade() -> None:
    op.drop_column("app_state", "maintenance_revalidate_batch")