"""增加用户token_version字段 — 单设备登录

Revision ID: 20260813_token_version
Revises:b7e2c4d91a63
Create Date: 2026-08-13 10:00:00.000000
"""
from alembic import op
import sqlalchemy as sa

# revision identifiers, used by Alembic.
revision = '20260813_token_version'
down_revision = 'b7e2c4d91a63'  # 设置为上一个迁移的 revision
branch_labels = None
depends_on = None


def upgrade():
    op.add_column('users', sa.Column('token_version', sa.Integer(), nullable=False, server_default='0'))


def downgrade():
    op.drop_column('users', 'token_version')