The MSmerge_past_partition_mappings table stores one row for each partition id a given changed row used to belong to, but no longer belongs to. This table is stored in the publication database.
The publication number, which is stored in sysmergepublications.
The nickname of the published table.
The row identifier for the given row.
The ID of the partition the row belongs to. The value is –1 if the row change is relevant to all Subscribers.
The value of the generation in which the partition change occurred.