* Persist Dag
* Add schema
* Add new message
* add mapping
* Adding check to save block
* Removing blocks mapping
* Make changes to block processing
* Change from mapping to a slice of hashes
* Adding tests to core
* adding more tests
* Fixing service test
* Add comments and fix bazel
* fix lint
* fix conflicts
* addressing review comments
* Removing references to active
* fixing tests with active state
* Protytype for #440: Persist blocks and latest state in DB
* simplify code
* removing block registry
* fix test
* adding block removal/iterator
* Addressing review comments
* Addressing comments
* removing extra line
* making vars private and adding canonical key
* fix lint
* splitting methods
* adding more changes
* lint
* improving coverage
* removing decodeslotnumber
* gazelle
* remove todos
* addressing preston's comments
* remove slotnumber
* lint
