alembic 迁移表主键

表名: files

原表的主键名为 md5，现在添加新主键 id，修改生成的迁移文件:

op.drop_constraint('md5', 'files', type_='primary') # 手动添加
op.add_column('files', sa.Column('id', ...))
op.create_primary_key('id', 'files', ['id']) # 手动添加
op.alter_column('files', 'md5', ...)

参考:

• [drop_constraint] https://alembic.sqlalchemy.org/en/latest/ops.html?highlight=operations#alembic.operations.Operations.drop_constraint
• [create_primary_key] https://alembic.sqlalchemy.org/en/latest/ops.html?highlight=operations#alembic.operations.Operations.create_primary_key