"""Add deleted_at to musehub_objects for soft-delete support.

Objects are logically deleted by setting deleted_at; hard-delete
runs only after the retention window (object_retention_days config).

Revision ID: 0021
Revises: 0020
"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

revision = "0021"
down_revision = "0020"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.add_column(
        "musehub_objects",
        sa.Column(
            "deleted_at",
            sa.DateTime(timezone=True),
            nullable=True,
            server_default=None,
        ),
    )
    op.create_index(
        "ix_musehub_objects_deleted_at",
        "musehub_objects",
        ["deleted_at"],
    )


def downgrade() -> None:
    op.drop_index("ix_musehub_objects_deleted_at", table_name="musehub_objects")
    op.drop_column("musehub_objects", "deleted_at")