Module undelete 

Restore a record from its tombstone, while the tombstone still exists (ADR 0029).

Only the kinds whose body a tombstone retains can be restored — the manifest kinds. Every other tombstone has an empty body, so there is nothing to restore from.

This rides Store::put_raw rather than put. A consumer put treats a tombstone as absent and re-stamps meta.created, which is right for put — it cannot tell restoring a deleted record from reusing a recycled key, and must not change meaning depending on whether collect has run. put_raw never re-stamps, so an explicit restore keeps the record’s age. “Raw” means a record that already happened, and a restoration is exactly that.

Functions

undelete

Restore the record at key from its tombstone, returning the revision written. author, when given, is stamped as the restorer; None keeps the tombstone’s author.