Improve db setup cache pool and link insertions

Description

This PR includes the following improvements

Added connection pooling to Redis cache instance, preventing overrun of connections to Redis DB when used among many async threads concurrently
Improved link insertion concurrency and reduced noisy error reporting
Improved annotations
Database object has not an await method to trigger migrations following Database.create( ..) when not using alembic.
updated actions tests to utilize docker-compose db's to reduce duplication of service configuration
added rc assertions within test_migrations module.
Fixes #54 - updated logging for database setup to no longer display as warning