"""Make admin_id nullable in admin_logs for system actions

Revision ID: 017_admin_logs_nullable_admin_id
Revises: 016_add_banned_until
Create Date: 2024-12-19

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '017_admin_logs_nullable_admin_id'
down_revision: Union[str, None] = '016_add_banned_until'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Make admin_id nullable for system actions (like auto-unban)
    op.alter_column('admin_logs', 'admin_id',
                    existing_type=sa.Integer(),
                    nullable=True)


def downgrade() -> None:
    # Revert to not nullable (will fail if there are NULL values)
    op.alter_column('admin_logs', 'admin_id',
                    existing_type=sa.Integer(),
                    nullable=False)