checkin.created, branch.created and tag.* come off the artifact; branch.moved comes from the computed branch after RecomputeBranches, because only a branch's first check-in carries a sym- tag.

Raising is not idempotent while folding is, so the fold asks the index which hashes are new before writing them. A rebuild raises nothing. check-in: a1b816cd96 user: dmestas tags: trunk