"""make machine_type nullable

Revision ID: e303f1560466
Revises: 537d2b83a6e9
Create Date: 2026-09-09 14:50:37.900673

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = 'e303f1560466'
down_revision: Union[str, None] = '537d2b83a6e9'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.alter_column('maintenance_asset', 'machine_type',
               existing_type=sa.String(length=50),
               nullable=True)


def downgrade() -> None:
    op.alter_column('maintenance_asset', 'machine_type',
               existing_type=sa.String(length=50),
               nullable=False)