"""${message}

Revision ID: ${up_revision}
Revises: ${down_revision | comma,n}
Create Date: ${create_date}

Reversible: yes | no —— 若为 no 必须写明原因。CI 会跑 upgrade → downgrade → upgrade，
不可回滚的迁移必须显式拆成「先加列后回填」两步，不允许一步到位。
"""

from __future__ import annotations

from collections.abc import Sequence

import sqlalchemy as sa
from alembic import op
${imports if imports else ""}

revision: str = ${repr(up_revision)}
down_revision: str | None = ${repr(down_revision)}
branch_labels: str | Sequence[str] | None = ${repr(branch_labels)}
depends_on: str | Sequence[str] | None = ${repr(depends_on)}


def upgrade() -> None:
    ${upgrades if upgrades else "pass"}


def downgrade() -> None:
    ${downgrades if downgrades else "pass"}