Module legacy 

Read-only, repeatable migration into a separate p-memory directory.

Structs

IdMapping

来源 ID 与内部自增 ID 的映射；内部主键与外部 ID 无关，只在导入时关联。

ImportReport

ImportRequest

Enums

LegacySource

Functions

delete_import_run

从导入台账里删掉一条来源记录，让同一个来源能在同一目录上重新导入。 只删台账，不碰该来源已经导进去的数据；返回是否命中。

import_legacy

Dry run validates in an in-memory database without creating the destination. Applying requires an empty directory. Repeating an identical import returns its receipt; changed sources never overwrite data previously imported.