"""Add from_snapshot_id and to_snapshot_id to musehub_proposals.

Captures the HEAD commit ID of each branch at proposal creation time,
providing cryptographic anchors for FROM STATE and TO STATE.

Revision ID: 0049
Revises: 0048
"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

revision: str = "0049"
down_revision: str = "0048"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.add_column(
        "musehub_proposals",
        sa.Column("from_snapshot_id", sa.String(128), nullable=True),
    )
    op.add_column(
        "musehub_proposals",
        sa.Column("to_snapshot_id", sa.String(128), nullable=True),
    )


def downgrade() -> None:
    op.drop_column("musehub_proposals", "to_snapshot_id")
    op.drop_column("musehub_proposals", "from_snapshot_id")