* cache did docs in redis
* drop table
* expire from redis
* fix tests
* add cache class
* update api
* refactor
* filter negative labels
* fix up dev-env
* refactor did cache to use new redis cache class
* tidy
* ensure caching negatives
* redis cache tests
* remove timeout on did cache
* fix ns in test
* rename driver
* add timeout & fail open
* add test for timeout & fail open
* small pr feedback
* refactor caches
* bugfixg
* test for caching negative values
* little more to cache
* wire up cache cfg
* switch from redis scratch to redis
* fix build issues
* use different redis clients for tests
* fix test
* fix flaky test
* use separate db for redis cache
