* att sign validations
* eliminate old cached methods and use a simple approach in the db
* redefined db methods
* db package builds
* add multilock to attest and propose
* gaz
* removed concurrency tests that are no longer relevant
* add cache to db functions for attesting history checks
* passing
* add in feature flag --disable-attesting-history-db-cache
* remove lock
* Revert "remove lock"
This reverts commit b1a65020e406b9fa6e4f57c5cc6a5a0b2a11a240.
* comment
* gaz