* logical changes in repo
* tests
* tweak commit data
* building pds
* patching up some tests
* tidy + more tests
* patch up bsky
* clean up db
* db migration
* small patches
* fix up another test
* reinclude prevs
* api & lex updates
* add back in deprecated routes
* backward compatibility for commit v2
* add upgrade repo version root
* move namespace
* migration test
* patch up a few more tests
* remove deprecated rebase routes
* tweak api
* sprinkle rev around a few more places
* getCurrent -> getLatestCommit
* fix test
* pr feedback & tidy
* fix up block pagination
* tidy again
* add in a tets
* add cursor to listBlobs
* getRepo rev -> since
* clean up proofs test
* dont change getHead
* tweak migrate route
* build branch
* hit index in block range query
* check for dupe record refs
* tidy
* set prev to null
* dont build branch
* mst: more test coverage
In particular, ports the older fanout=32 corner-case tests to fanout=16.
I generated new paths with correct level and ordering, but haven't
actually verified that the resulting structures have the shape of the
ASCII diagrams in text.
* mst: additional comments, including TODO questions
* mst: default new MST layer to 'null' not 0
Looks like all current call sites of this 'create()' function override
the layer already. This is just making it explicit that the default,
null, means the layer has not been computed yet, distinct from being
layer=0.
* mst: remove one TODO and reformat another
From review.
