"""T10: Add role_id FK column to users table (references roles.id).

Revision ID: 0005_user_role_fk
Revises: 0004_ai_workflows
Create Date: 2026-07-03
"""

from __future__ import annotations

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

revision: str = "0005_user_role_fk"
down_revision: Union[str, None] = "0004_ai_workflows"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column(
        "users",
        sa.Column(
            "role_id",
            postgresql.UUID(as_uuid=True),
            sa.ForeignKey("roles.id", ondelete="SET NULL"),
            nullable=True,
        ),
    )
    op.create_index("ix_users_role_id", "users", ["role_id"])


def downgrade() -> None:
    op.drop_index("ix_users_role_id", table_name="users")
    op.drop_column("users", "role_id")