- """初始关系表和约束；仅首版建表使用元数据，后续迁移须冻结具体增量操作。"""
- from alembic import op
- from app.domain.models import Base
- revision = '0001_initial'
- down_revision = None
- branch_labels = None
- depends_on = None
- def upgrade():
- """新库建立全部业务约束；已有表的迁移禁止由 create_all 猜测。"""
- Base.metadata.create_all(op.get_bind())
- def downgrade():
- """显式 downgrade base 会删除业务表，运行前必须备份数据库和上传目录。"""
- Base.metadata.drop_all(op.get_bind())
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