* Start testing blob pruning
* Get rid of unnecessary orphaned blob column
* Make random blob tests deterministic
* Test for pruning being blocked by finality
* Fix bugs and test fork boundary
* A few more tweaks to pruning conditions
* Tweak oldest_blob_slot semantics
* Test margin pruning
* Clean up some terminology and lints
* Schema migrations for v18
* Remove FIXME
* Prune blobs on finalization not every slot
* Fix more bugs + tests
* Address review comments