"""add_yard_location_to_chassis_master

Revision ID: 2524cd124037
Revises: ef8ef6d858a0
Create Date: 2026-08-29 14:42:54.406756

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '2524cd124037'
down_revision: Union[str, None] = 'ef8ef6d858a0'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    columns = [c['name'] for c in inspector.get_columns('chassis_master')]
    if 'yard_location' not in columns:
        op.add_column('chassis_master', sa.Column('yard_location', sa.String(length=100), nullable=True))


def downgrade() -> None:
    op.drop_column('chassis_master', 'yard_location')