"""Make ansible_runs.triggered_by nullable (automated runs have no user)

Revision ID: 0012_ansible_run_nullable
Revises: 0011_audit_log
Create Date: 2026-06-02

Note: the revision id is kept <=32 chars to fit alembic_version.version_num.
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa

revision: str = "0012_ansible_run_nullable"
down_revision: Union[str, None] = "0011_audit_log"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.alter_column(
        "ansible_runs", "triggered_by",
        existing_type=sa.String(36),
        nullable=True,
    )


def downgrade() -> None:
    # Re-imposes NOT NULL; will fail if any system-triggered (NULL) rows exist.
    op.alter_column(
        "ansible_runs", "triggered_by",
        existing_type=sa.String(36),
        nullable=False,
    )