"""Add owner_id and is_shared to dashboards

Revision ID: 0007_dashboard_ownership
Revises: 0006_dashboard_is_default
Create Date: 2026-03-22
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa

revision: str = "0007_dashboard_ownership"
down_revision: Union[str, None] = "0006_dashboard_is_default"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # owner_id nullable — existing dashboards keep NULL (system-owned)
    op.add_column(
        "dashboards",
        sa.Column("owner_id", sa.String(36),
                  sa.ForeignKey("users.id", ondelete="SET NULL"), nullable=True),
    )
    # Existing dashboards become shared so all users still see them
    op.add_column(
        "dashboards",
        sa.Column("is_shared", sa.Boolean, nullable=False, server_default="1"),
    )


def downgrade() -> None:
    op.drop_column("dashboards", "is_shared")
    op.drop_column("dashboards", "owner_id")