When doing lookaside eviction, the timestamp information for the on-disk values gets written into the lookaside in the form of birthmark records. A birthmark record in the lookaside is needed because the on-disk format doesn't carry any timestamp information.

When re-instantiating a page that was lookaside evicted, we need to read the lookaside information immediately to be able to restore these timestamp value for the on-disk records. We have identified this to be the only information we need that would help us move towards not having to read the lookaside file when re-instantiating the page.

This ticket will define the contents of the metadata that we will need to store on a page to instantiate the birthmark records without having to read the lookaside. This ticket also tracks the work of populating this metadata when doing a lookaside eviction and then instantiating birthmark records from this metadata.