"""make_project_id_nullable_in_git_repositories

Revision ID: 2026_05_27_external_repos
Revises: 2026_05_26_add_git_mounts
Create Date: 2026-05-27 08:30:00.000000

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = "2026_05_27_external_repos"
down_revision: Union[str, Sequence[str], None] = "2026_05_26_add_git_mounts"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Expand alembic_version version_num to avoid truncation errors
    op.execute("ALTER TABLE alembic_version ALTER COLUMN version_num TYPE VARCHAR(64)")
    
    # Make project_id nullable to allow external repositories
    op.alter_column(
        "git_repositories",
        "project_id",
        existing_type=sa.UUID(),
        nullable=True,
    )


def downgrade() -> None:
    op.alter_column(
        "git_repositories",
        "project_id",
        existing_type=sa.UUID(),
        nullable=False,
    )
    op.execute("ALTER TABLE alembic_version ALTER COLUMN version_num TYPE VARCHAR(32)")