"""Drop state_refs column from musehub_issue_comments.

state_refs stored parsed musical context references (track:X, section:X,
beats:X-Y) — a music-domain feature removed when the project pivoted to a
general-purpose VCS. The column was always written as [] after the feature
was removed; dropping it cleans up the schema completely.

Revision ID: 0019
Revises: 0018
"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

revision = "0019"
down_revision = "0018"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.drop_column("musehub_issue_comments", "state_refs")


def downgrade() -> None:
    op.add_column(
        "musehub_issue_comments",
        sa.Column("state_refs", sa.JSON(), nullable=False, server_default="[]"),
    )