"""test versioning

Revision ID: 003
Revises: 002
Create Date: 2026-03-21

"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "003"
down_revision: Union[str, None] = "002"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column(
        "tests",
        sa.Column("parent_id", sa.Integer(), sa.ForeignKey("tests.id"), nullable=True),
    )
    op.create_index("ix_tests_parent_id", "tests", ["parent_id"])


def downgrade() -> None:
    op.drop_index("ix_tests_parent_id", table_name="tests")
    op.drop_column("tests", "parent_id")