"""drop message currency column for CNY-only ledger

Revision ID: 202603060002
Revises: 202603050001
Create Date: 2026-03-06 16:40:00
"""

from __future__ import annotations

from typing import Sequence, Union

from alembic import op


revision: str = "202603060002"
down_revision: Union[str, Sequence[str], None] = "202603050001"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.drop_column("messages", "currency")


def downgrade() -> None:
    raise RuntimeError(
        "Irreversible migration: messages.currency data was dropped in upgrade()"
    )