- Delete header on conflict to prompt data refresh (cascade deletes all
data associated with that block)
- Derive header hash from rpc payload rather than computing it from data
(prevents hash mismatch between blockchain and cache)
* Use shared repo tests for vat flux
* Use shared repo methods for vat flux
* Use shared repo test examples for vat fold
* Use shared repository methods for vat fold
* Use shared repo test examples for vat grab
* Use shared repo methods for vat grab
* Use shared repo test examples for vat heal
* Use shared repo methods for vat heal
